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JVC KW-X840BTS Digital media receiver (does not play CDs)

Item # 105KWX840B

With JVC's KW-X840BTS digital media receiver in your dash, you have options, and lots of them.

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With JVC's KW-X840BTS digital media receiver in your dash, you have options, and lots of them.

Item # 105KWX840B

About the JVC KW-X840BTS

Alexander H.

Big features and bold style

With JVC's KW-X840BTS digital media receiver in your dash, you have options, and lots of them. You'll get built-in Bluetooth® connectivity, a USB port, and an aux input, plus you can use a compatible iPhone® or Android™ phone to control whatever the receiver's doing. And if you're a big-time Amazon Alexa user, you'll be able to call on your favourite voice-controlled assistant in the car. You can even add a satellite radio tuner (sold separately) and expand your entertainment horizons even more.

Big features and bold style

With JVC's KW-X840BTS digital media receiver in your dash, you have options, and lots of them. You'll get built-in Bluetooth® connectivity, a USB port, and an aux input, plus you can use a compatible iPhone® or Android™ phone to control whatever the receiver's doing. And if you're a big-time Amazon Alexa user, you'll be able to call on your favourite voice-controlled assistant in the car. You can even add a satellite radio tuner (sold separately) and expand your entertainment horizons even more.

Built-in Amazon Alexa

After you load the Alexa app onto your phone and pair your phone to this JVC receiver, simply press the dedicated "Alexa" button on the faceplate, and you can access music, audiobooks, news, weather, traffic, and smart home controls using your voice.

Great Android compatibility

JVC's remote control app lets you use your compatible Android phone's touchscreen to control your music. With your Android phone safely attached to a mount, you can reach down and skip a track without taking your eyes off the road. Android users can access Pandora® and Spotify® through the Bluetooth connection — no wires needed. You can control your favourite stations using your voice, your phone, or the receiver itself.

Get the most from your iPhone

The KW-X840BTS gives you control over your iPhone with a wired connection so you can navigate your stored music with ease.

Go hands-free with Bluetooth

Automatic pairing makes it a lot easier to enjoy hands-free calling and wireless audio streaming, no matter what kind of phone you're using. You can also pair two phones at once, so you don't have to choose between the personal phone and the work phone when you're driving.

Add on satellite radio

Start enjoying the wide variety of music, sports, news, and entertainment by adding an optional SiriusXM® tuner (sold separately) to your KW-X840BTS. With coast to coast coverage, you'll never have to stop enjoying your favourite channels.

Colorful choices

The KW-X840BTS plays MP3, WMA, AAC, WAV, and even high-resolution FLAC files, and you'll find a wide array of sound-shaping tools, including Space Enhancement to match the sound to the size of your car, and a 13-band graphic equalizer. The variable-colour display lets you choose the look you like, and you can assign different colours to two zones.

Bluetooth note: Use of this receiver's Bluetooth features will depend upon your phone's Bluetooth capabilities. Learn more in our article explaining Bluetooth profiles.

READ LESS

Product highlights:

    General Features:
    • digital media receiver with AM/FM tuner (does not play CDs)
    • built-in Bluetooth for audio streaming and hands-free calling (mic included)
      • full-time Bluetooth connection for two phones
    • use JVC's remote control app to control the receiver with your phone
    • 1.5-line display
    • plays MP3, WMA, AAC, WAV, and FLAC files through USB
    • menus can be displayed in English and Spanish
    • 2-zone variable color button illumination with 2-line display
    Smartphone Features:
    • built-in iPhone control
    • built-in Amazon Alexa
    • Siri Eyes-Free-Mode for iPhone
    • control PANDORA and Spotify from select smartphones
    • Android app for gesture control over playback
    Audio Features:
    • 24-bit digital-to-analog converter
    • high-and low-pass filters
    • sound-shaping tools get more out of your music files
    • JVC Streaming DJ lets you pair up to 5 smartphones via Bluetooth for music playback
    • 13-band EQ and time alignment
    • Volume Link EQ boosts specific frequencies to compensate for road noise
    • K2 technology improves the sound of all music sources
    Expandability:
    • compatible with SiriusXM satellite radio tuner (sold separately, subscription required)
    • inputs: front USB port (1.5A), front auxiliary input
    • outputs: 6-channel preamp outputs (2.5-volt front, rear, sub)
    Other Info:
    • built-in amplifier (22 watts RMS/50 peak x 4 channels)
    • compatible with most factory steering wheel audio controls (adapter required)
    • front USB 1.5A connection charges devices quickly
    • warranty: 1 year
    • MFR # KW-X840BTS

    What's in the box:

    • Digital media receiver (10A fuse)
    • Wiring harness
    • Microphone w/ bracket (attached 10' cable terminated by a right-angle mono 3.5mm connector)
    • 8 Pan-head ISO-mount screws (M5 x 8mm)
    • 8 Counter-sunk ISO-mount screws (M5 x 6mm)
    • Instruction Manual
    • Warranty Information
    • Software License Agreement

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    4.5 out of 5 stars
    125 reviews

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    More details on the JVC KW-X840BTS

    Stacey B.

    Features & specs

    Expandability
    AUX Input Front
    Audio/video Input ---
    USB Input Front
    USB Port Power 1.5A
    Backup Camera Input No
    Second Camera Input No
    CarPlay No
    Android Auto No
    Siri Control Bluetooth
    Alexa Voice Control Y
    Android Control Yes
    Memory Card Slot USB memory
    Bluetooth Compatible Built-in
    Satellite Radio Ready SiriusXM 2.0
    HD Radio No
    Navigation ---
    iPod Compatibility
    Full size No
    Nano No
    Touch 6 and newer
    iPhone 5S and newer
    General
    RMS Power (CTA-2006) N/A
    RMS Power (Manufacturer) 22 watts
    Peak Output 50 watts
    RMS Power Bandwidth 20-20kHz
    Preamp Outputs 6-channel
    Sub Preamp Outputs Yes
    Switchable Rear Preamp Outputs No
    Video Screen No
    Navigation App Compatible (iOS)
    Navigation App Compatible (Android)
    Preamp Voltage 2.5 volts
    Screen Size ---
    Screen Type ---
    Display Color White
    Key Button Color Variable
    EQ Bands 13
    Wireless Remote Optional
    Steering Wheel Control Compatible Adapter required
    Parts Warranty 1 Year
    Labor Warranty 1 Year
    Tuner
    FM Sensitivity 8.2 dBf
    European Tuning Yes
    Seek/Scan Seek
    Radio Data System Yes
    File Playback
    Music File Playback MP3,WMA,AAC,WAV,FLAC
    High-res Playback FLAC (96kHz)
    The JVC KW-X840BTS replaces these items:

    Product Research

    Alexa & iPhone Integration
    Built-in Bluetooth
    Internet+SiriusXM+AM/FM Radio
    USB/Aux Playback
    Audio Section
    Remote & App Control
    Display Features

    Alexa & iPhone Integration

    Amazon Alexa Compatible: The JVC KW-X840BTS features built-in Alexa with voice control. Alexa is a cloud-based voice control digital assistant developed by Amazon. You can ask Alexa to play music get weather reports, traffic information, control smart home devices, set reminders, and more. You'll need to install the Amazon Alexa app (for Apple iOS 11.0+ and Android OS 5.0+) on your compatible smartphone device to setup the JVC receiver for voice control. Your Apple iPhone or Android smartphone will need to be connected via Bluetooth (not USB) to the JVC receiver and have an active data plan from your service provider with internet connection. You'll simply press The "Amazon Alexa" key on the JVC head unit to activate Alexa voice control and speak into the included external microphone. The receiver will provide display feedback during Alexa voice control - "Listening" appears while you are saying your voice command, "Thinking" appears when Alexa is processing your voice command, and "Speaking" appears while Alexa is responding to your voice command. Alexa and your requested content or information will be heard over your vehicle's speakers. Here are a few things you can do with Amazon Alexa voice control -

    • Music & Audiobooks: Using Amazon Alexa voice control your can select, play, and control your favorite music from Amazon Music, Pandora, iHeartRadio, TuneIn, Spotify, and SiriusXM. You can also listen to audiobooks from Audible. *The JVC receiver does not support all of Amazon Alexa compatible music services.
    • Phone Calls: Ask Alexa to call a contact or place of business. Access to your phone and contacts must be enabled within the Alexa app.
    • Traffic & Parking Information: Ask Alexa for traffic information and available parking.
    • Weather, News, & Sports: Check weather reports, news updates, and sport scores using Amazon Alexa and your voice.
    • Smarthome Control: Use Amazon Alexa and your voice to control compatible smarthome devices, such as garage door openers and outdoor lighting.
    • Questions & Answers: Amazon Alexa lets you ask questions about general things and check Wikipedia.
    • Times & Alarms: Use your voice and Amazon Alexa, you can set timers and alarms.

    Notes:

    • The Amazon Alexa App is required for setup. The JVC receiver is recognized as "Headphones" when adding a device in the Alexa app. Click here for more information regarding Amazon Alexa setup and voice control.
    • Alexa cannot be accessed by simply saying "Alexa" like on some home devices; the "Alexa" button must be pressed on the front of the unit to access Alexa voice control.
    • JVC does not guarantee compatibility with all Amazon Alexa features and may not support some functions.
    • Amazon Alexa voice control does not control non-Alexa source, audio, and menu functions of the JVC receiver.
    • If your Apple iOS or Android device loses Bluetooth or Internet connection, Alexa voice control will be terminated.
    • Alexa is a source input of the receiver. If you switch to another source input, Alexa voice control will be terminated.
    • Only one Apple iOS or Android device can be connected for Alexa voice control at a time.

    iPhone Direct Connection: The JVC KW-X840BTS's front-panel USB port can be used to connect select Lightning Apple iOS devices to the receiver. The USB connection allows for playback of stored music and music apps on your iPhone or iPod touch through the JVC receiver. Use the Lightning-to-USB cable that came with your Apple device or an "Apple Certified" Lightning-to-USB cable (sold separately - see Accessories Tab) to connect your iPod/iPhone to the KW-X840BTS.

    • Head Unit Control: From the head unit's front-panel controls you can search for stored music by Playlist, Artist, Album, Song, Podcast, Genre, and Composer. The contents of a Playlist or Category can be searched alphabetically or numerically. The KW-X840BTS also supports Repeat (file/all) and Random (album/all) playback functions of stored music on your iPod/iPhone. In addition, you'll be able to control basic playback functions (such as Play/Pause, Previous/Next Track) from stored music and select music apps streamed to your Apple iPod/iPhone. You can also choose to control your Apple device from its own touchscreen, instead of the head unit.
    • Song/Artist Info: The KW-X840BTS will display your iPod/iPhone's music file information such as Track number, Elapsed playing time, Artist name, Song title, and Album title.
    • Battery Charging: The head unit's USB connection provides 1.5A of current to power and charge your connected Apple iPod/iPhone when your vehicle's ignition switch is set to the 'ACC' or 'On' position (if your iPod/iPhone has no initial battery charge, then the unit will not recognize it).

    Apple Device Compatibility Chart: The JVC KW-X840BTS is "Made for iPod/iPhone" compatible and supports the following iPod/iPhone model features (as of 3/3/2022):

    Apple Device Generation TestedVersion Media Type Control Type Specific Apps Display Type Bluetooth Charge
    Audio Video Head Unit iPhone Alexa JVC Remote Pandora Artist/Song Text Track Info Phone Audio Siri
    iPhone
    5/5C 10.3.3 N N N N N N N N N Y Y Y Y
    5S/6/6+ 12.4.1 Y N Y Y Y Y Y Y Y Y Y Y Y
    SE/6S/6S+ 15.3.1 Y N Y Y Y Y Y Y Y Y Y Y Y
    7/7+/8/8+ 15.3.1 Y N Y Y Y Y Y Y Y Y Y Y Y
    X/XR/XS/XSMax 15.3.1 Y N Y Y Y Y Y Y Y Y Y Y Y
    11/11Pro/11ProMax 15.3.1 Y N Y Y Y Y Y Y Y Y Y Y Y
    12/12mini/12Pro/12ProMax 15.3.1 Y N Y Y Y Y Y Y Y Y Y Y Y
    13/13mini/13Pro/13ProMax 15.3.1 Y N Y Y Y Y Y Y Y Y Y Y Y
    iPod touch 5th 9.3.5 N N N N N N N N N N Y Y Y
    6th 12.4.1 Y N Y Y Y N N Y Y N Y Y Y

    Notes:

    • This unit does not support the iPod Nano or older 30-pin Apple iPod and iPhone devices.
    • Apple iPod/iPhone software updates may change functionality results. If you download a newer software version, you may need to reset the head unit and your iPod/iPhone to regain functionality. If this doesn't work, you may need to wait until a newer software update is available.
    Built-in Bluetooth

    Bluetooth 4.2: The JVC KW-X840BTS is equipped with built-in Bluetooth 4.2, allowing you to make and receive phone calls wirelessly through the receiver; as well as stream music wirelessly from your smartphone to the head unit. In order to use Bluetooth wireless technology, your phone must also be Bluetooth compatible and be able to interpret certain profiles. This unit is compatible with the following Bluetooth Profiles:

    • Hands-Free Communication: HFP 1.7 (Hands Free Profile) & PBAB 1.0 (Phone Book Access Profile).
    • Audio Streaming: A2DP 1.2 (Advanced Audio Distribution Profile) & AVRCP 1.6 (Audio/Video Remote Control Profile).
    Note: Due to the differences in Bluetooth technology, some Bluetooth enabled devices may be incompatible, function improperly, or may not support all features when used with the JVC KW-X840BTS. Check here for the latest Bluetooth compatibility information.

    SSP & USB Pairing: With Secure Simple Pairing (SSP), you can easily pair a Bluetooth enabled phone to the JVC KW-X840BTS without having to enter pin codes or go through complicated settings. You can even pair your Apple iPhone (iOS 5+) by simply connecting it to the JVC head unit via USB and following a single prompt on the head unit's display.

    • Dual Phone Connection: Thanks to the Dual Phone Connection feature, two Bluetooth-enabled phones can remain connected to the JVC receiver. This means you can an answer an incoming call from either phone from the head unit. Also, both of your phone's contact lists are downloaded to the receiver. To make a call from one of the phones using the JVC receiver, you simply have to select Phone 1 or Phone 2 on the head unit's front-panel.
    • Streaming DJ: The new Streaming DJ feature allows five Bluetooth audio source devices to be connected to the JVC receiver at one time, so you can switch between Bluetooth playback sources a lot easier and quicker. While "BT Audio" source is selected on the head unit, you can simply press the music playback button on your connected Bluetooth source devices to switch between devices and begin music playback. However, you cannot stream audio from two different Bluetooth audio source devices at the same time or combine music libraries or playlists from two different connected devices.
    Note: You can pair up to five Bluetooth-enabled devices to the JVC head unit. When an already paired Bluetooth device is in close proximity to the receiver, the auto connection function automatically pairs the two units.

    Bluetooth Hands-Free Communication: The head unit supports Bluetooth hands-free communication for your Bluetooth enabled mobile phone. And thanks to the latest Hands-Free Profile (HFP 1.7) with wideband speech capability, the KW-X840BTS provides more natural sound quality and details during wireless calls. The controls of the KW-X840BTS can be used to dial a number, answer an in-coming call, or end a call. The unit also includes an external microphone (with mounting bracket) featuring adjustable gain, so you can carry on your side of the conversation while listening to the caller through your vehicles speakers. During a conversation, you can switch between the Private Mode (talking directly on your cell phone) and the Hands Free Mode.

    • Answering A Call: When a call comes in, a ring-tone will be heard through your vehicle's speaker and the caller's name or phone number will be displayed. You can answer the call from the head unit's front-panel controls, or setup the head unit to automatically answer the incoming call immediately or after 1-30 seconds. The KW-X840BTS also supports the Call Waiting function, so you can answer another incoming call while suspending the current call you are on. Your compatible cell-phone must also support this feature.
    • Dialing A Number: Using the KW-X840BTS, you can dial a phone number in one of the following ways:
      • Enter Phone #: Allows you to directly dial a phone number up to 32 digits from the head unit's front-panel rotary dial.
      • Preset Dialing: You can store up to 6 contacts in the memory of this unit for speed dialing.
      • Phone Book: You can download phone book data from your mobile phone to the digitial media receiver. You can then dial a contact within the phonebook from the head unit's front-panel controls. Your phonebook can be searched alphabetically or numerically.
      • Call History: The Call History is a list of calls that have originated from and were received by this unit that you can dial. You can select Outgoing, Incoming, or Missed calls.
      • Voice Dialing: If your mobile phone supports voice recognition, then you can dial out by voice command. Simply speak into the included microphone once you have activated the voice dialing function from the head unit's front-panel.

    Wireless Audio Streaming: The JVC KW-X840BTS supports wireless audio playback (AD2P) and control (AVRCP) of a Bluetooth-enabled smartphone or audio player, plus song/artist information display. You are able to stream your stored music library on your Bluetooth-enabled smartphone, as well as music apps downloaded on your smartphone to the JVC KW-X840BTS for playback.

    • SBC + AAC Codecs: In addition to support for the standard SBC Bluetooth audio codec, the KW-X840BTS offers support of AAC. By supporting AAC, the KW-X840BTS offers better audio performance of the music streamed from your Apple iPod, iPhone, or iPad.
    • Advanced Music Browsing: In addition to basic playback functions (Play/Pause, FF/RW, Skip, Random/Repeat), the KW-X840BTS lets you browse your stored music by Playlist, Artist, Album, Song, etc. Advanced music browsing is supported by Android 4.0+ smartphones and Apple iPhones 5.0+ (specific advanced functions vary by phone).
    • Song/Artist Information: The head unit will also display your stored music and music app's song information; such as Artist name and Song/Album title (not compatible with all apps).
    Note: When an incoming call or outgoing call is in progress from your Bluetooth enabled mobile phone, audio streaming will be paused so you can take your call. Once the call is finished, your streaming music will resume.

    Siri Eyes Free Control: When paired to an iPhone with Siri via Bluetooth, the JVC KW-X840BTS has the ability to access Siri through its front-panel control and external microphone. Simply press the "phone command" button on the KW-X840BTS to engage Siri and use the included microphone to communicate with Siri. Siri's voice will heard through your vehicle's speakers. All Siri functions including hands-free calling, music search, setting reminders, text-messaging, audible navigation, and more can be done through the head unit and its microphone. You can even ask Siri to get directions to a destination and the turn-by-turn instructions will heard through your vehicle's speakers, while the on-screen map still displays on your iPhone with Bluetooth; the head unit's audio is attenuated while Siri provides audible directions.

    Note: The head unit will only display hands-free calling and Bluetooth audio information (all other functions of Siri are only audible through the KW-X840BTS; visual data will still need to be viewed from your iPhone device).

    External Mic: The external wired microphone offers improved audio quality versus an integrated microphone, so you can be heard easier over noisy traffic and road noise. You can adjust the volume level, noise cancellation, and echo cancellation of the microphone without affecting the other sources. The external microphone features an attached 10' cable terminated by a right-angle 3.5mm connector which plugs into the mic input on the rear-panel of the head unit. The microphone offers an integrated mounting bracket which can be clipped to your vehicle's sun-visor or taped to your dash.

    Low Battery Information: When the battery of a connected Bluetooth device runs low, a beep sound is heard and "LOW BATTERY" appears on the receiver's display.

    Internet+SiriusXM+AM/FM Radio

    Internet Radio Apps: The JVC KW-X840BTS allows you to access the Pandora online music service through your USB-connected or Bluetooth-connected iPhone, or Bluetooth-connected Android smartphone. Your Apple iPhone can be connected to the KW-X840BTS via USB or through Bluetooth. Your Android smartphone must be connected via Bluetooth. You can also access Apple Music Radio through your USB or Bluetooth connected iPhone. Your iPhone or Android smartphone will need an active Data Plan account with connection to the Internet via 3G, EDGE, LTE (4G), or WiFi.

    • Pandora App: The free Pandora App (for Apple iOS 11.0+ or Android 4.0+) lets you play music from the Pandora music service through the JVC KW-X840BTS using your USB or Bluetooth connected Apple iPhone, or Bluetooth connected Android smartphone. The JVC KW-X840BTS provides control over the Pandora music service and displays Artist, Album, and Song information. You can select Pandora stations from your station list and sort them by date or alphabetically. New stations can be created based on the current songs or artists playing. You can also skip song tracks within a station. You can even give songs a thumbs up or thumbs down, as well as bookmark song information. An active Pandora account is required.
    • Apple Music Radio (iPhone Only): You can playback Apple Music Radio on your USB or Bluetooth connected Apple iPhone (iOS 9.3.5+) through the JVC head unit. With a WiFi or cellular connection on your iPhone, you can listen to Beats 1 and other live radio stations through the JVC receiver. Apple Music subscribers can also listen to on-demand stations for almost any genre or create their own stations. You can use the head unit's front-panel controls to select between your Apple Music Radio stations. The unit's front-panel display will also indicate song/artist/album information (no album art).
    Note: Access to these Internet Radio services will depend on the availability of a cellular and/or WiFi network for purposes of allowing your iPhone or Android smartphone to connect to the Internet. Not supported in Canada and only available in the United States.

    SiriusXM-Ready: The JVC KW-X840BTS is SiriusXM-Ready and compatible with the SiriusXM Connect Vehicle Tuner (220SXV300 sold separately). The SiriusXM Connect Vehicle Tuner supports SiriusXM programming with access to 140+ SiriusXM channels via subscription; check out the most popular SiriusXM subscription packages here. Additional features of the SiriusXM Connect tuner include:

    • Channel List w/ Category Search: The Channel list displays a list of all available channels. You can also search and list channels in specific categories.
    • Song/Artist Info: Displayed Information such as Channel Name, Artist Name, & Song Title can be viewed on the head unit's LCD.
    • SmartFavorite Presets: Up to 18 SiriusXM Satellite Radio station presets can be saved. These 18 SiriusXM presets are automatically identified as SmartFavorites for advanced features such as Replay, TuneStart & TuneScan (see below).
      • Replay: When you select a SmartFavorite preset you can rewind and replay up to 30 minutes of any of the missed news, talk, sports or music content.
      • TuneStart: With the TuneStart enabled, playback will automatically start from the beginning of a song when you tune to a SmartFavorite preset channel.
      • TuneScan: TuneScan gives you a short preview of the songs that you have missed on each of your Smart Favorite Preset music channels or currently tuned music channel.
    • Parental Control: Channels containing unsuitable content for children can be blocked. When enabled, The Parental Control feature requires you to enter a 4-digit passcode to tune to the locked channels.
    Note: A separate SiriusXM Satellite Radio subscription is required (operates on the XM Network). However, you can easily add this SiriusXM tuner to an existing Sirius or XM account for a Multi-Radio Discount Plan.

    RDS AM/FM Tuner: The JVC KW-X840BTS features a built-in AM/FM tuner with manual, seek, and preset tuning. You can store a total of 18 FM stations presets and 6 AM station presets. The radio allows you to set your AM/FM stations manually or automatically. You can also switch the tuner's IF filter to Wide or Auto to increase/decrease the sensitivity. If an analog FM stereo broadcast is hard to receive, you can manually switch the tuner to Mono operation.

    • US or European Tuning: You can set the built-in AM/FM tuner between US standard and European tuning spacing.
    • RDS: The Radio Data System (RDS) feature displays radio broadcast information such as artist, title, and album when listening to compatible AM/FM stations.
    • Radio Timer: The head unit's Radio Timer features lets you tune into a preset station at a specific time regardless of the head unit's current source (you can activate the Radio Timer once, daily, or turn it completely off).
    USB/Aux Playback

    USB MSC Playback: The JVC KW-X840BTS features front-panel USB (type-A) port that is hidden by a flip-out cover. The USB port enables connection of a USB mass storage class (MSC) device; like a USB thumbdrive, USB card reader, or portable digital audio player. You can insert a compatible USB MSC device into the head unit's USB port for playback, control, and song/artist display of a variety of music files.

    • Music Drive: The Music Drive feature lets you switch between multiple memory cards in a USB multi-card reader. When a mass storage class (MSC) compatible smartphone is connected to the head unit's USB input, the unit's Music Drive features lets you select its internal memory or external memory (such as an SD card) for stored music playback.
    • USB Charging: USB devices that can be charged via USB will be charged when plugged into the digitial media receiver's USB port (max. 1.5A), and the vehicle's ignition switch is set to ACC or On.
    Note: Not compatible with Android OS devices and USB hubs.

    Compatible Music Files: The JVC KW-X840BTS supports the following types of music files recorded onto a USB mass storage class device.

    Media Type USB (MSC)
    File System FAT 12/16/32
    Playable File Types MP3: bit rate of 8-320kbps w/ sampling rate of8-48kHz
    WMA:
    bit rate of 32-192kbps w/ sampling rate of 8-48kHz
    AAC:
    bit rate of 8-320 kbps w/ sampling rate of 8-48 kHz
    WAV:
    bit depth of 16-bit w/ sampling frequency of 44.1kHz
    FLAC:
    bit depth of 24-bit w/ sampling frequency of 96kHz
    Maximum # of Folders/Files 999 folders/20,480 files (999 files per folder)
    Tags ID3(version 1.0/1.1/2.2/2.3/2.4), WMA, AAC, & FLAC tags

    Playback & Search Functions: The JVC KW-X840BTS offers a variety of playback and search functions to help you find and enjoy your music on USB.

    • Track/Folder List: The Track/Folder List displays a list of music folders and tracks on an inserted USB device, so you can easily access your music.
    • Repeat: Track Repeat (plays the current track repeatedly), Folder Repeat (plays all tracks of the current folder repeatedly), Off (cancels repeat function)
    • Random: Folder Random (plays all tracks of the current folder, then the tracks of the next folder in random) or Off (cancels random function)
    • Resume: If you change the source, playback also stops (without ejecting the USB device). Next time you select USB for the playback source, the player will start from where it has been stopped previously.

    Front-Panel Auxiliary Input: A front-panel stereo minijack is provided to allow the connection of almost any portable audio source with a 3.5mm headphone output. Simply connect your portable digital music player to the unit's front-panel auxiliary input, and you can listen to the audio from the portable player through the speakers in your mobile audio system.

    Audio Section

    24 Bit D/A Converter: The JVC KW-X840BTS in-dash digitial media receiver utilizes a 24-bit (DAC (digital-to-analog converter) for superior sound quality.

    MOSFET Amplifier: The JVC KW-X840BTS is equipped with a MOSFET amplifier. Compared to conventional power supplies, the MOSFET amplification circuit is smaller and more efficient, and it delivers increased power with less distortion and absolutely zero on/off switching noise. More power means louder and cleaner music at higher volumes because you're not pushing the limits of the amplification circuit. The power output specs for the KW-X840BTS are as follows:

    • Full Bandwidth Power: 22 watts RMS x 4 channels (at 4 ohms, 20-20kHz, 1% THD)
    • Maximum Output Power: 50 watts x 4 channels (200 total watts)

    Amp Gain: When you are using the KW-X840BTS with factory speakers (or those rated to less than 50 watts peak), the Amplifier Gain Control can limit the amount of power being sent to those speakers. When the Amp Gain Control is set to "low," the volume control ranges from 0 (minimum) to 25 (maximum). When using speakers rated higher than 50 watts peak, you can set the Amp Gain Control to "high," and the volume control will range from 0 to 35.

    6ch/2.5V Preamp Outputs + Sub Control: The JVC KW-X840BTS features front, rear and subwoofer 2.5-volt preamp outputs. The front and rear speaker preamp outputs are balance and fade adjustable. The subwoofer preamp output is non-fading and offers independent level control (-50 to +10).

    Subwoofer Speaker Connection: You can connect a subwoofer to this head unit without the need of a separate power amplifier. Simply connect a single subwoofer (4-8 ohm) directly to head unit's left rear speaker leads (the right rear speaker output will be muted). The rated power output for the subwoofer speaker channel remains 22 watts. Same subwoofer controls apply, except the, subwoofer level adjustment is from -6 to+3.

    Vehicle Setup: In order to optimize the sound quality in your vehicle, you can indentify the type of vehicle you have and the rear speaker location, as well as configure listening distances.

    • Car Type: Select your car type to automatically set the delay time of each speaker for timing adjustment of sound output of each channel to have the highest surround effect. Choose from Compact, Full Size Car, Wagon, Mini Van, SUV, or Off
    • Rear Speaker Location: You can indicate the location of your vehicle's Rear speakers. Choose from Door, Rear Deck, 2nd Row, or 3rd Row.
    • DTA (Digital Time Alignment): For a better sound-stage you can select your optimal listening position. You can choose from All, Front Left, Front Right or Front. You can also select to manually fine tune the sound stage, using Digital Time Alignment (DTA) by selecting the distance (0-20') for each individual speaker in the vehicle compared to your listening position.

    Crossover Network: The JVC KW-X840BTS lets you choose between a 2-way or 3-way crossover network for your car audio application.

    • 2-Way Crossover: Allows you to set high-pass and low-pass crossovers for a standard Tweeter, Front, Rear, and Subwoofer speaker setup.
      • Speaker Size: select which size speakers are in your vehicle.
        • Tweeter: Small, Medium, Large, or None
        • Front & Rear: 3.5", 4", 4.75", 5", 6.5", 6.75", 7", 4x6", 5x7", 6x8", 6x9", 7x10" or None
        • Subwoofer: 6.5", 8", 10", 12", 15" or greater, None
      • X'Over: Select the high pass or low pass crossover settings for your speakers.
        • Tweeter: high pass filter (HPF)
          • Frequency: 1kHz, 1.6kHz, 2.5kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz, 12.5kHz
          • Gain: -8 to 0 dB
        • Front & Rear: high pass filter (HPF)
          • Frequency: 30Hz, 40Hz, 50Hz, 60Hz, 70Hz, 80Hz, 90Hz, 100Hz, 120Hz, 150Hz, 180Hz, 220Hz, 250Hz, Through (Full-Range)
          • Slope: -6dB, -12dB, -18dB, -24dB
          • Gain: -8 to 0 dB
        • Sub: low pass filter (LPF)
          • Frequency: 30Hz, 40Hz, 50Hz, 60Hz, 70Hz, 80Hz, 90Hz, 100Hz, 120Hz, 150Hz, 180Hz, 220Hz, 250Hz, Through (Full-Range)
          • Slope: -6dB, -12dB, -18dB, -24dB
          • Phase: Reverse (180°), Normal (0°)
          • Gain: -8 to 0 dB
    • 3-Way Crossover: Allows you to set high-pass and low-pass crossovers for a complex 3-way speaker system with Highs, Mids, and Sub.
      • Speaker Size: select which size speakers are in your vehicle.
        • Tweeter: Small, Medium, Large, or None
        • Midrange: 3.5", 4", 4.75", 5", 6.5", 6.75", 7", 4x6", 5x7", 6x8", or 6x9"
        • Woofer: 6.5", 8", 10", 12", 15" or greater, None
      • X'Over: Select the high pass or low pass crossover settings for your speakers.
        • Tweeter: high pass filter (HPF)
          • HPF Frequency: 1kHz, 1.6kHz, 2.5kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz, 12.5kHz
          • Slope: -6dB, -12dB
          • Phase: Reverse (180°), Normal (0°)
          • Gain: -8 to 0 dB
        • Midrange: high pass filter (HPF) & low pass filter (LPF)
          • HPF Frequency: 30Hz, 40Hz, 50Hz, 60Hz, 70Hz, 80Hz, 90Hz, 100Hz, 120Hz, 150Hz, 180Hz, 220Hz, 250Hz, Through (Full-Range)
          • LPF Frequency: 1kHz, 1.6kHz, 2.5kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz, 12.5kHz
          • Slope: -6dB, -12dB
          • Phase: Reverse (180°), Normal (0°)
          • Gain: -8 to 0 dB
        • Woofer: low pass filter (LPF)
          • LPF Frequency: 30Hz, 40Hz, 50Hz, 60Hz, 70Hz, 80Hz, 90Hz, 100Hz, 120Hz, 150Hz, 180Hz, 220Hz, 250Hz, Through (Full-Range)
          • Slope: -6dB, -12dB
          • Phase: Reverse (180°), Normal (0°)
          • Gain: -8 to 0 dB

    Equalizer: The JVC KW-X840BTS is equipped with 11 EQ presets, a 3-Band Easy EQ (3-band), a 13-Band Pro EQ. Choose the one that best fits your type of music listening.

    • 11 EQ Presets: You can choose between the following EQ presets - Flat, Hard Rock, Pop, Hip Hop, R&B, Jazz, Classical, Drive 1/2/3, & User. The Drive EQ boosts certain frequencies ranges that becomes hard to hear due to road noise (there are 3 levels). The User mode allows you to select either the 3-band Easy EQ or 13-Band Pro EQ.
    • 3-Band Easy EQ: The head unit's Easy EQ consists of a 3-band equalizer (Treble, Mid, & Bass). You can adjust the Treble, Mid, & Bass from -9 to +9.
    • 13-Band Pro EQ: The units Pro EQ consists of a 13-band equalizer (100Hz, 160Hz, 250Hz, 400Hz, 630Hz, 1kHz, 1.6kHz, 2.5kHz, 4kHz, 6.3kHz, 10kHz, & 16kHz). Each frequency can be adjusted from -9 to +9. You can also adjust the Q-Factor of each frequency to 1.35, 1.50, or 2.0.

    K2 Technology: The KW-X840BTS employs K2 technology which dramatically improves the sound quality of compressed music files during USB and Bluetooth playback. When the K2 feature is activated, the sound becomes wider, smoother, and more natural.

    Sound Effects: The KW-X840BTS offers adjustable Sound Effects to provide a better listening experience inside your vehicle. Use the "Enhance" feature to virtually broaden the soundstage inside your vehicle. Use the "Sound Lift" feature to virtually lift the sound to ear level. Use the "Response" feature to virtually make the sound more realistic and live inside your car. Use the "Vol Link EQ" feature to boost certain frequencies ranges that become hard to hear due to road noise.

    Loudness, Bass Boost & Bass Extension: The Loudness feature boosts low and high frequencies to produce a well-balanced sound at a low volume level. The unit's Bass Boost enhances low bass frequencies at any volume level. There is also a Bass Extension feature which further enhances the unit's bass output.

    Volume Adjust: The input level of each source (other than FM) is adjustable relative to the FM radio volume, so there isn't a significant volume difference when changing sources. Each source is individually adjustable from -15 to +6.

    Key Beep: The in-dash head unit provides an audible beep to confirm button operation. This function can be turned On or Off.

    Remote & App Control

    JVC Remote App (for iOS & Android): The JVC Remote App is an application (for Apple iOS 8.0+ and Android OS 4.4+) operates the JVC receiver like a wireless remote control from your USB or Bluetooth connected Apple iOS device, or your Bluetooth connected Android device. The JVC Remote App provides traditional touchscreen control, as well as directional and freeform gesture control from your compatible mobile device.

    • Source Information & Control: The JVC Remote App provides a Source Control screen with a list of the receiver's built-in sources and connected sources to choose from, so you can change the head unit's source from your mobile device. Once an input is selected, the app displays source information such as station number, track number & playback time, as well as song/artist information (when applicable). From the the app, you can also seek stations and tracks, as well as Play and Pause your music.
    • Audio Settings: From the application on your mobile device, you can adjust the receiver's volume up or down. In addition, audio settings such as EQ, Crossover, DTA, and other audio adjustments can be easily set using the JVC Remote application.
    • Media Player: The application's Media Player screen lets you playback your device's stored music library through the JVC receiver. From the app on your Apple iOS or Android device, you can control basic playback functions like Play/Pause, Previous/Next Track and Repeat/Random. The Android version of the app even lets you browse your music library by category (Song/Album/Artist/Playlist/Mood). Song, artist, and album information (along with Album Art) will displayed on your Apple iOS or Android device's touchscreen. 
    • App Launcher (Android only): The App Launcher feature of the Android version of the JVC Remote app lets you access 3rd party applications within the JVC Remote app's user interface. The App Launcher can contain up to 24 of your favorite apps for quick access.
    Notes:
    • You will need to indicate within the head unit's menu what type of device (Apple iOS or Android) you'll be using the JVC Remote App on before the application will connect and function with the receiver.
    • When using the JVC Remote App with your compatible Apple iOS device, the application and device must be connected to the receiver via Bluetooth (not USB) for playback of Bluetooth audio. For playback of a USB-direct connection from an Apple iOS device, the device and application must be connected to the head unit via USB (not Bluetooth).

    Steering Wheel Remote Compatibility: The head unit features an OEM steering wheel remote control input wire (blue/yellow) within the included wiring harness that lets you keep your vehicle's factory radio steering wheel remote controls when used with an optional steering wheel control adapter (vehicle specific and sold separately).

    Optional Wireless Remote: The KW-X840BTS can be controlled wirelessly from JVC's RM-RK52 IR remote control (sold separately; not available at Crutchfield).

    Display Features

    2-Line VA (Vertical Alignment) LCD: The JVC KW-X840BTS is equipped with a 2-line VA (Vertical Alignment) LCD screen that offers high contrast, sharp images, and a wide viewing angle for better visibility. The 2-line display provides more information with animation effects. The LCD screen provides information for audio settings, song/artist/album info, station identification, and clock. You can even select between English, Spanish, or Canadian French text.

    Variable Color Button Illumination: You can mix the front-panel button illumination into two separate color zones or use the same color for both zones (see owner's manual for illustration). You can even set a different color setting for Night & Daytime. You can select from one of 49 preset colors, choose from one of 7 different color patterns that change at 3 different speeds, or customize your own RGB color in 32-steps (providing a total of 32,768 different colors to choose from). The custom setting allows you to individually adjust the intensity of Red, Green, and Blue (from 0-9) to better match your vehicle's interior lights.

    Note: The display illumination is not variable and is fixed with a white text and black background.

    Music Sync Effect: The Music Sync Effect feature changes illumination patterns of receiver's display according to the rhythm of the music.

    Brightness & Dimmer Control: The JVC KW-X840BTS offers a brightness & dimmer control to suit day- and night-time driving.

    • Brightness: The unit offers a daytime and nighttime brightness settings for the LCD and button illumination. You can adjust the brightness level of each manually from 0-31.
    • Dimmer: The unit's dimmer control can be set automatically, manually, or via timer. Manually select "Off" for daytime brightness setting or "On" for nighttime brightness setting. Choose "Auto" which switches between day and nighttime brightness setting automatically when you turn off/on the headlights (orange/white wire of harness must be connected to headlamp circuit). You can even set a specific time for the "Off" and "On" dimmer setting to be activated.

    Day & Time: The unit displays a 12-or 24-hour clock, as well as the day (Sun/Mon/Tue/Wed/Thu/Fri/Sat). The day & time can be selected to remain on, even if the head unit is switched off (as long as the vehicle's key is in the accessory or on position).

    Demo Mode: This unit features a Demo mode which can be turned On or Off within the menu.

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    Customer Q&A

    13 questions already asked

    Q
    Will this fit inside a 2004 Mazda 3 sedan ??
    hannah  Feb 26, 2022
    1 answer
    A
    You can check to see if this will fit your vehicle by using our Outfit My Car tool: http://www.crutchfield.com/car/carselector.aspx For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.
    kenneth  Mar 02, 2022 (Staff)
    Q
    Which trim ring fits JVC KW-X840BTS? Installation is a cabinet im a travel trailer.
    aaron  Feb 14, 2021
    1 answer
    A
    We currently offer a flush mount kit: www.crutchfield.com/p_120999999/item.html and a under dash/cabinet mount: www.crutchfield.com/p_120959000/item.html that could help you secure this receiver in place
    jason  Mar 02, 2021 (Staff)
    Q
    How do I set more than 6 present stations?
    roy  Sep 28, 2020
    1 answer
    A
    If you purchased the product from Crutchfield, feel free to contact our Tech Support team. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer.
    kristina  Oct 27, 2020 (Staff)
    Q
    Can install subs?
    mahlon  Jul 07, 2020
    1 answer
    A
    Yes... has rca outputs for sub.
    timothy m.  Jul 07, 2020
    Q
    What adapter do I need for steering wheel controls to work?
    dylan  May 10, 2020
    1 answer
    A
    The ability to retain steering wheel controls with aftermarket receivers will be determined by the receiver you are using and the vehicle you have. For full information on this type of integration (including the parts you will need) please contact an Advisor by phone (1-800-324-9695) or online chat.
    kristina  May 22, 2020 (Staff)
    Q
    How do I setup amazon Alexa. I followed the instructions and when I get on the app the device does not appear. Anyone know how to set it up?
    joseph  Feb 27, 2020
    1 answer
    A
    If you purchased the product from Crutchfield, feel free to contact our Tech Support team. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer.
    kristina  Mar 24, 2020 (Staff)
    Q
    Can you wire the head unit without wiring harness?
    ryan  Feb 09, 2020
    3 answers
    A
    If you are referring to the adaptor that fits your vehicles factory wiring, then yes you can. You will need to cut the factory connector off of your vehicle or peel the insulation on your factory wires back somewhere behind the connector. Hope this helps
    edward  Feb 10, 2020
    A
    The easiest way to do it is to buy the wiring harness from crutchfield and have it ready to hook up ready when you receive it. All you do is unplug the factory harness and plug the new harness to it. 30 second job. If not it's gonna take awhile to get it ready
    michael  Feb 09, 2020
    A
    I don't know I purchased the wiring harness. It was very easy to install with it.
    mario  Feb 09, 2020
    Q
    Can I connect my iPhone VIA Bluetooth and play music?
    erin  Feb 05, 2020
    4 answers
    A
    Yes automatically connects within 30 seconds once setup.
    taylor  Feb 05, 2020
    A
    Sure can
    jason  Feb 05, 2020
    A
    Yes you can, and it is very easy and simple to do.
    kyle  Feb 05, 2020
    A
    Yes. Bought this for my teenage son at Christmas. He loves it. We purchased it specifically for that reason.
    daniel  Feb 05, 2020
    Q
    Does this stereo have a spot to hook a switch wire for an amp?
    cody alan  Feb 02, 2020
    2 answers
    A
    Brian is right! Since is has those preamp outputs, it has an amp remote turn on wire so those amps can turn on with this radio
    jason  Mar 09, 2020 (Staff)
    A
    Yes it has 3 sets of rca outs. Front rear and subwoofer
    brian  Mar 06, 2020
    Q
    Will my back up camera be able to work at all?
    steven  Jan 11, 2020
    4 answers
    A
    This unit does not have a screen to support any type of camera.
    kurt w.  Jan 12, 2020
    A
    no this doesn't have video inputs
    david  Jan 12, 2020
    A
    I'm sorry, but I don't have an answer for you. I don't believe that this unit has the ability to show video ON SCREEN. Alexa works perfectly though.
    richard  Jan 11, 2020
    A
    This receiver does not provide any video and therefore will not work for backup camera.
    timothy m.  Jan 11, 2020
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