Audio Section
Video Section
Network & Tuner Functions
AirPlay/Bluetooth/USB Integration
Wireless Multiroom Audio Playback
Remote, App, & Voice Control
Convenience Features

Audio Section

Discrete Amplification: The Denon AVR-S660H AV receiver features a powerful Class AB power amplifier section equipped with discrete high current power transistors. This discrete amplifier design delivers optimum realism and stunning dynamic range. By using high current, high power discrete power devices, the amplifier is able to easily drive high quality speakers. The AV receiver's five channel Class AB amplifier is rated at 75-watts (into 8-ohms, at 20-20kHz, with 0.08% THD, driving 2 channels).

Audyssey Suite: The AVR-S660H features the Audyssey suite of powerful DSP features - including MultEQ speaker/room calibration, Dynamic Volume, and Dynamic EQ.

• MultEQ: Via the supplied measuring microphone, Audyssey MultEQ measures all the speakers in your home theater during setup, including the subwoofer, and then generates multiple high precision DSP room acoustic correction filters, which together provide smoothest and most natural tonal balance, regardless of the brand or model of the various speakers. Up to six listening positions can be measured, configured, and recorded. MultEQ compensates for both time and frequency characteristics of the listening area based on "Audyssey Setup" measurement results. Selection is done from three types of compensation curves - Reference (default and recommended, L/R Bypass, Flat, and Off). You can also choose to manually configure your speaker setup.
• Dynamic Volume: Audyssey Dynamic Volume features advanced psycho-acoustic processing to deliver clear dialog and wide range sound at reduced volume levels so that you can enjoy theater-level clarity at whatever listening level you choose.
• Dynamic EQ: Audyssey Dynamic EQ also features advanced DSP processing to deliver full range wide-band response, even at reduced volume levels. Dynamic EQ Reference Level Offset provides three offsets from the film level reference (5 dB, 10 dB, and 15 dB) that can be selected when the mix level of the content is not within the standard.

32-Bit DACs: For optimum fidelity and the widest dynamic range with lowest distortion, the AVR-S660H features advanced reference-class 32-bit/192kHz digital-to-analog converters (DAC) on all channels. This ensures consistent high fidelity and precise channel matching across all channels for the ultimate listening experience.

Powerful DSP: The Denon AVR-S660H features two sets of powerful DSP (Digital Sound Processor) chips for the latest surround sound decoding and processing, including Dolby TrueHD & DTS-HD. The AV receiver supports the following stereo & multichannel digital audio formats through its HDMI jacks and optical/coax digital inputs.

Post Decoding Formats: The Denon AV receiver supports Dolby Pro Logic II (Movie/Music/Game) and DTS Neo: 6 (Music/Cinema) to enhance 2-channel and multichannel decoding formats. The receiver offers the additional Dolby Pro Logic II and DTS NEO:6 audio adjustments.

• Dolby Pro Logic II Settings: You can adjust the following parameters in Pro Logic II Music modes: Panorama (sends stereo signals to the surround speakers as well as the front speakers for a wraparound effect), Dimension (adjusts the soundfield either towards the front or towards the rear of the room), and Center Width (moves the center channel output completely towards the center speaker or towards the front left and right speakers).
• Center Image (DTS NEO: 6 Music): This parameter adjusts the front left and right channel output relative to the center channel to make the center channel more or less dominant as necessary.

Listening Modes: The Denon AVR-S660H features a variety of Listening modes to choose from, so you can enjoy your movie or music soundtrack the way you want to hear it.

• Auto Detection: In Auto Mode, the Listening Mode switches automatically to the corresponding type of audio input signal (Dolby Digital, Dolby TrueHD, Dolby Digital Plus, DTS, DTS-HD, or multichannel PCM) that is detected. If the input signal is analog or PCM (2-channel), stereo playback is used.
• Denon Original Sound: Denon's Original Listening Modes, combined with Dolby Digital/DTS processing, produce more realistic, powerful sound effects for your movie and music sound tracks based on the type of content and your home theater setup. Choose between Rock Arena, Jazz Club, Matrix, Video Game, Mono Movie, Multichannel Stereo, or Virtual (surround from only front speakers or headphones).
• Stereo Playback: Sound is output from the front left and right speakers, as well as the powered subwoofer. If multichannel signals are input, they are mixed down to 2-channel audio. The tone settings can be adjusted.
• Direct Mode: The Denon AVR-S660H offers a Direct Listening Mode which bypass the receiver's tone & DSP processing for higher sound quality performance. Direct Mode provides playback of 2ch or Multichannel audio in its original form, without any surround or tone processing.

Audio Enhancements: The Denon AVR-S660H receiver provides various audio enhancements to deliver a high-quality listening experience every time.

• CINEMA EQ (Cinema Equalizer): The Cinema EQ function gently decreases the level of the extreme high frequencies, compensating for overly-bright sounding motion picture soundtracks. Select this function if the sound from the front speakers is too bright. This function only works in the Dolby Digital & DTS modes.
• Compressed Audio Restorer: Compressed audio formats such as MP3, WMA (Windows Media Audio), and MPEG-4 AAC reduce the amount of data by eliminating signal components that are hard for the human ear to hear. The Restorer function generates the signals eliminated upon compression, restoring the sound to conditions near those of the original sound before compression. It also corrects the sense of volume of the bass to obtain richer sound with compressed audio signals.
• Dynamic Range Compression (DRC): Motion picture soundtracks have tremendous dynamic range (the contrast between very soft and very loud sounds). For listening late at night, or whenever the maximum sound level is lower than usual, Compressing the dynamic range allows you to hear all of the sounds in the soundtrack with reduced dynamic range. DRC works when playing program sources recorded in Dolby Digital or DTS.
• Room Size: The receiver's audio output can be set to simulate the acoustics of a Small, Medium Small, Medium (default), Medium Large, or Large room environment. This setting is not an indication of the actual size of your listening area.
• LFE + Main: The LFE + Main setting boosts the bass sound by feeding the low-frequency signal to both the loudspeakers and the powered subwoofer, regardless of audio format or listening mode.

Volume & Level Settings: The AVR-S660H offers the following volume & level settings.

• Volume Settings: You can choose to display an Absolute volume scale (0-98) or Relative volume scale (-79.5 to 18dB). You can also set a maximum volume level of 0 (80), -10 (70), or -20 (60) dB to limit the receiver's total volume output. In addition, you can define the volume setting that is active when the power is turned on; select "Mute", -79 to +18dB (1-98), or Last.
• Mute Level: You can set the amount of attenuation for the audio muting circuit; -40dB or -20dB below current volume, or full mute (sound turned off entirely).
• Channel, Center, & Subwoofer Level: The volume level (-12 to +12dB) of each channel can be changed while listening to audio for each input source. You can also adjust the center channel volume level (-12 to +12dB) independently from the channel level to clarify the dialog for all sources. In addition, you can adjust the subwoofer channel volume level (-12 to +12dB) independently from the channel level to emphasize low frequencies for all input sources.
• Source Level: This function adjusts the playback level of the currently selected input source's audio input. Use this feature if there are differences in the input volume levels between different sources. You can correct the playback level of the audio input from -12 to +12dB.

eARC (Enhanced Audio Return Channel): This feature of the AV receiver's main HDMI monitor output allows audio to be sent from your compatible TV to the receiver through the same HDMI cable already being used to send audio and video to your TV. This eliminates the need for extra cables connected to your television. eARC (Enhanced Audio Return Channel) will support uncompressed audio formats like Dolby TrueHD, & DTS HD Master Audio - where as the previous ARC (Audio Return Channel) was limited to only Dolby Digital, Dolby Digital Plus, DTS, DTS HD, and PCM.

Audio Outputs: The Denon AVR-S660H AV receiver features binding-post speaker terminals, dual sub outputs, and a front-panel headphone jack.

• Color-Coded Speaker Terminals: The receiver has binding-post terminals for all speaker connections. The binding-post terminals can accept bare wire, pin connectors, and banana plugs (single/dual). The receiver will accept speaker impedances of 4 to 16-ohm. The AV receiver comes with color-coded labels to easily identify which channel a speaker cable should be connected to. Since the speaker cables have labels in the same colors as the connectors on the AVR-S660H's rear panel, there's no longer any confusion about which terminals they should be connected to.
• Dual Sub Outputs: For compatibility with dual subwoofer home theater systems, the AVR-S660H features two non-discrete subwoofer outputs. With dual subwoofers, which can be placed in different parts of the room, you'll benefit from response averaging, which helps provide smoother and more detailed deep bass, compared to a conventional single subwoofer speaker system. The same signal is output from each sub output.
• Headphone Jack: When headphones are plugged into the full-size 1/4" jack on the front panel, all the speakers are automatically muted.

Phono Input: The Denon AVR-S660H is outfitted with a Phono input (MM), so you can connect your turntable and listen to your vinyl records with high-quality sound.

Video Section

HDMI 2.1: Featuring six HDMI inputs and one HDMI output, the AVR-S660H incorporates an advanced video section that features some of the latest HDMI 2.1 specifications; including support for 8K/60Hz and 4K/120 Hz video pass-through (up to 40Gbps), HDCP 2.3 compatibility, BT.2020 Wide Color Gamut, and 4:4:4 Pure Color sub-sampling.

• 4K/120 Hz + 8K/60Hz Pass-Through: All of the AVR-S660H's HDMI inputs and monitor output support up to 4K (3840x2160 pixels) video @ 60 frames per second. Three of the HDMI inputs (4-5-6) and the HDMI output also support 8K (7680 x 4320) video @ 60 frames per second, as well as 4K (3850x2160) video @ 120 frames per second (both up to 40Gbps). In addition, the receiver will pass 1080p/i, 720p, and 480p/i video signals via HDMI.
• HDCP 2.3 Compliant: All of the AV receiver's HDMI inputs and output support HDCP 2.3, which fully complies with the latest copyright protection standard for 4K/HDR video transmission.
• 4:4:4 Color Subsampling: The HDMI inputs and monitor output support RGB, YCbCr 4:4:4, YCbCr 4:2:2, and YCbCr 4:2:0 color subsampling (pixel depth and frame rate will vary). With 4:4:4 color subsampling, luminance (brightness) and chroma (color) are sampled at the same rate; resulting in an RGB color palette as big as the video sampling rate for a video image with more colors, plus greater color accuracy and detail.
• Wide Color Gamut (BT.2020): The BT.2020 color standard delivers a much wider color gamut and represents about 75% of the total visual color spectrum, while the current Rec. 709 color standard selected as the color space for HDTVs and early generation 4K Ultra HDTVs covers only 35% of the total visual color spectrum.

HDMI Video Upscaling: The Denon AVR-S660H is equipped with an 8K video upscaling function that allows HD 1080p and Ultra-HD 4K video sources connected to any of the AV receiver's HDMI inputs to be output via the receiver's HDMI monitor output at 8K (7680 × 4320 pixels) resolution. HD 1080p video sources can also be upscaled to 4K (384 x 2160 pixels). The receiver does not offer any other resolution upscaling and does not support analog-to-HDMI upconversion.

HDR (High Dynamic Range): The Denon AVR-S660H supports HDR (high dynamic range) Video - including HDR10, HDR 10+, Hybrid Log-Gamma, Dolby Vision, and now Dynamic HDR. HDR provides enhanced picture quality by simultaneously enabling greater detail for both the dark and bright parts of an image. HDR reproduces a greater dynamic range of luminosity or brightness levels, creating greater contrast. This increased contrast reveals the subtle nuances of the image, from detailed blacks and shadows to the brightest whites and colors, plus greater depth.

• HDR10: HDR10 is an open standard and currently the most popular HDR format on the market. It uses static metadata at the start of a movie to tell the receiver and your TV that the video content is encoded using HDR.
• HDR10+: HDR10+ id s a new open standard that leverages dynamic metadata to produce enhanced contrast and colors on an expanded range of televisions. HDR10+ incorporates dynamic metadata that allows the adjustment of brightness levels on a scene-by-scene or even frame-by-frame basis. By applying individualized tone mapping to each scene, HDR10+ delivers an incredible viewing experience. The picture quality offers an enhanced visual experience with more detailed expressions, brighter shadow areas and more accurate color renderings that stay true to the creator's original intent.
• Hybrid-Log Gamma: HLG (Hybrid-Log Gamma) is primarily designed for live video feed and over-the-air broadcasts. It uses no pre-encoded metadata and is backwards compatible with SDR. HLG's native compatibility allows much of today's existing SDR infrastructure to be re-used for HDR in the future.
• Dolby Vision: Unlike HDR 10 which contains static metadata and HLG which uses no metadata, Dolby Vision uses dynamic metadata technology which sets individual color and brightness levels for each and every scene. Dolby works directly with filmmakers at major Hollywood studios to create superior HDR video masters of blockbuster movies.
• Dynamic HDR: Dynamic HDR enables a noticeable progression in overall video image quality from SDR to static HDR, and now static HDR to dynamic HDR. Dynamic HDR support ensures every moment of a video is displayed at its ideal values for depth, detail, brightness, contrast, and wider color gamuts on a scene-by-scene or even a frame-by-frame basis. Dynamic HDR enhanced content is available for movies, videos, TV shows, video and PC games and VR.

Optimized Gaming: Showcased in the AVR-S660H are new HDMI features like Variable Refresh Rate (VRR), Quick Frame Transport (QFT), and Auto Low Latency Mode (ALLM) - which reduce or eliminate lag and frame tearing to offer a smoother, lag-free gaming experience.

• Variable Refresh Rate (VRR): Support for Variable Refresh Rate (VRR) allows the TV to adapt to certain Game console's frame rate. This helps to reduce or eliminate lag, stutter and frame tearing for more fluid and better detailed gameplay.
• Auto Low Latency Mode (ALLM): The receiver will enter ALLM (Auto Low Latency Mode) when it detects a gaming signal from a compatible device (such as a Xbox One) and allows for a smooth, lag-free gaming experience. During ALLM, the receiver disables the i/p scaler and Auto Lip Sync function.
• Quick Frame Transport (QFT): Quick Frame Transport (QFT) transmits each frame at a higher rate to decrease "display latency", which is the amount of time between a frame being ready for transmission in the GPU and that frame being completely displayed. Enjoy reduced latency for smoother, tear-free entertainment experience.

Other HDMI Features: The Denon AVR-S660H AV receiver's HDMI connectivity also offers Quick Media Switching (QMS), 3D video pass-through, and auto LipSync function.

• Quick Media Switching: A new HDMI feature called Quick Media Switching (QMS) allows a HDMI video source to instantly switch the resolution or frame rate to eliminate screen blackout.
• 3D Ready: The AVR-S660H AV receiver supports 3D video pass-through (720p/1080p only) from connected 3D-compatible Blu-ray, games and broadcast devices to 3D-compatible HDTVs (all 3D components must be connected via HDMI). Special eyewear will be required for viewing 3D content.
• LipSync: This function adjusts the delay between audio and video output. You can do this manually or have the receiver set the LipSync function automatically. When connected to a TV via HDMI the receiver automatically adjusts audio output timing, if the TV supports an automatic LipSync function. You can also manually delay the sound output up to 500ms to synchronize it with the video image.

HDMI Standby Pass-Through: When the AV receiver is in "Standby" mode and the HDMI Standby Pass-Through function is enabled, both audio/video streams from the receivers HDMI input will be output to your television, via the AV receiver's HDMI monitor output. Once the receiver is turned "On", only video will pass through the monitor output to your TV and the audio is directed to the receiver's speaker outputs.

• HDMI Input: Selects the HDMI Input for which the HDMI Standby Pass-Through function is enabled.
• Last: The HDMI Standby-Through function is activated on the input source selected at the time of setting the AV receiver to the "Standby" mode.
• Off: The HDMI Standby Pass-Through function is disabled.

Composite Video Inputs/Output: The Denon AVR-S660H is equipped with two composite video inputs and one composite video monitor output. The composite video inputs can only be output via the composite video monitor output (there is not HDMI upconversion). The composite video jacks only support up to 480i (not compatible with 480p, 720p, or 1080i/p). There are no component video inputs or outputs.

Video Select Function: This receiver can display video from a different source on your connected TV during audio playback from CD (analog input only), Tuner, HEOS, or Phono.

Network & Tuner Functions

Wired or Wireless Network Connection: The Denon AVR-S660H offers a wired or wireless network connection. Either network connection gives the receiver access to HEOS music apps (like Pandora, Amazon,and Tidal), TuneIn Internet Radio, Spotify Connect, your music library on your Apple iOS or Android device, as well as music content on your Windows PC or DLNA music server.

• Ethernet Jack: The Denon AVR-S660H receiver is fitted with a RJ-45 Ethernet (LAN) port to make a wired connection from the receiver to your home network.
• Built-in WiFi: The receiver also offers built-in WiFi (IEEE 802.11ac; 2.4/5GHz) for a wireless network connection. WPS, WEP (64-/128-bit), WPA/2-PSK (TKIP), WPA-PSK/2 (AES), WPA3-SAE (AES) security protection is supported. Wireless network setup can be done via WPS button, Access Point Scan, Manual Setting, PIN Code, or even through your Apple iOS device (7.0+).

TuneIn Internet Radio: The Denon AVR-S660H includes access to more than 100,000 free internet radio streams from all corners of the globe via the built-in TuneIn online music service. Simply select TuneIn from the receiver's on-screen menu using the included remote and browse among the 100,000 stations neatly organized into popular categories and select a station that appeals to you.

Spotify Connect: If you subscribe to Spotify and have the Spotify App on your Apple iOS or Android mobile device, you can stream Spotify to the Denon AV receiver. Spotify is a digital music service that gives you on-demand access to one of the largest music libraries in the world (over 15 million tracks and counting). Spotify makes it easier than ever to discover, manage, and share music with your friends. You can browse music by artist, album, track, or most popular; and create your own music library with customized playlists.

HEOS Music Apps: With built-in HEOS technology and the HEOS app (for Apple iOS 9.0+ and Android OS 5.0) on your compatible Apple iOS or Android mobile device, you'll be able to stream a wide variety of online music services (fees may apply), plus the music library of your mobile device through the Denon AV receiver.

• Online Music Services: Using the HEOS app, you'll be able to stream your favorite online music services like Amazon Music (including HD), Pandora, TIDAL, iHeart Radio, SiriusXM, Napster, TuneIn, & Spotify (some services will require a paid subscription, purchases, and/or other fees). The HEOS app on your Apple iOS or Android device will serve as the controller for these apps and provide song/artist information with Album Art. You can create a "Favorite" station list, so you can quickly access your favorite internet radio stations and online music channels.
• Mobile Device Streaming: Using the HEOS app on your Apple iOS or Android mobile device, you are able to stream your device's stored music library to the Denon AV receiver. You'll be able to browse your music library by Artist, Album, Genre, and Song; control music playback functions like Play/Pause and Previous/Next Track; and view song/artist info with Album Art from the app on your compatible mobile device. You can even type in an artist name or song title to find music in your mobile device's library.

DLNA 1.5 Certified: The AVR-S660H is DLNA (Digital Living Network Alliance) 1.5 and Windows 7/8/10 compliant for audio networking. This means it's easier for you to access and enjoy digital music stored on your Windows PC. The receiver can wirelessly playback High-Res music content from your PC, while using the included remote control to browse your music library. The receiver supports ID3-Tag (ver.2) and META tag information; so song title, artist name, and album name can be displayed on the unit's front-panel or on-screen menu. In addition the unit will display Album Art on a connected television. The Denon AVR-S660H supports the following audio formats, sampling frequencies, and bit rates via its wired network connection.

Roon Tested: Roon is a feature rich music library and playback application that compiles all the music files available to your network and makes them easily available to play on the Denon receiver and any other Roon enabled audio devices. Roon manages digital music files (including FLAC, WAV, AIFF, ALAC, and DSD) collected on hard drives and networked storage devices. It can also integrate your iTunes library, and optionally merge with the Tidal and Qobuz music streaming services. Roon software can be installed on your Windows or Mac computer, while a Roon Remote app is available for Apple iOS 11.0+ and Android OS 5.0+). When you access the Roon software or remote app, it will display your complete audio library together with its metadata and artwork along with the available Denon receiver and other Roon enabled devices. Simply select the music you wish to play and the Denon receiver or Roon device in which you want to hear it on.

• To use Roon you will need a Roon Core running on the same network as the Denon receiver. The Core is media server software that runs on your computer, NAS, or component (like Nucleus or ROCK - sold separately), located on the network within your home.
• Make sure your Denon product has the latest firmware/software update installed.

AM/FM Tuner: The Denon AV receiver features a built-in AM/FM tuner with 56 station auto-preset memory tuning. You can also set your presets manually. You can create an 8-character name for each preset station. You can even directly enter a station number using the receiver's on-screen menu and remote control.

AirPlay/Bluetooth/USB Integration

AirPlay 2 with Siri: AirPlay 2 is an advanced and easy-to-use wireless multiroom audio platform for iTunes, Apple Music, and other compatible Apple iOS apps. With AirPlay 2 you can play any audio from your Apple iOS device (running iOS 11.4 or later) or Mac computer (running OS X 10.13.2) on the AV receiver and other compatible AirPlay 2 speakers throughout your home. You can choose to play audio in one room, play the same audio in grouped rooms, or play the same audio in every room. If you are an Apple Music subscriber, you can even play different music in different rooms (you can control and group directly from Apple's Music App and Home app on your Apple iOS device). You'll be able to ask Siri-enabled devices (like your Apple iPhone, iPad, or Watch) to control playback of your Apple Music content on the AV receiver. With AirPlay 2, you also get to see song/artist information and album art via the receiver's on-screen menu (via HDMI). You can even watch videos and movies from YouTube and Netflix on your compatible Apple iOS device or Mac computer with perfectly synced audio on the AV receiver.

Built-in Bluetooth: The Denon AVR-S660H is equipped with built-in Bluetooth (version 4.2) for wireless communication between Bluetooth-enabled audio source devices and headphones. The AVR-S660H can act as a Bluetooth receiver in order to wirelessly stream music from an audio device, or a Bluetooth transmitter in order to wirelessly stream music to a set of BT-enabled headphones. The receiver's Bluetooth wireless range is approximately 98.4'.

• Bluetooth Receiver Mode: In BT Receiver mode, you'll be able to wirelessly stream stored music, music apps, and other audio content from your Bluetooth-enabled source device (such as your smartphone, tablet, computer, or laptop) to the Denon receiver. The receiver supports the Bluetooth SBC codec only. You will also be able to control basic playback functions (Play/Pause, FF/RW, Skip) using the receiver's remote control. Advanced music operation will still need to be handled from your Bluetooth-enable device. There is no song/artist information display on the receiver or connected TV; continue to use your Bluetooth device's screen to view song/artist info. Up to eight Bluetooth source devices can be remembered by the AVR-S660H, so family members as well as friends can enjoy their favorite tracks (only one device can be used at a time). The receiver can even be setup to automatically re-connect with previously paired devices, as well as turn on automatically when you start streaming audio from a Bluetooth source device.
• Bluetooth Transmitter Mode: The Denon AVR-S660H can also act as a Bluetooth transmitter and stream its non-Bluetooth audio sources (HDMI, Network, USB, Analog, Optical/Coax Digital, & AM/FM tuner) out to most any Bluetooth-enabled headphone set. You can even have the same source playing from the main speakers and a Bluetooth headphone simultaneously (with little noticeable delay). Volume control of your Bluetooth headphones will be controlled via the Bluetooth device and not the receiver. Up to eight headphones can be paired with the receiver, but only one set of headphones can be connected and used at a time.

Front-Panel USB Port: The Denon receiver is equipped with a front-panel USB (type-A) port that allows you to enjoy a variety of music files from a USB mass storage class memory device; such as a USB thumbdrive or portable HDD (a portable hard disk drive will require an external power supply). Compatible USB storage devices must be formatted in FAT32 or NTFS with no more than 500 music folders and 5000 music files. You can use the receiver's on-screen menu (via HDMI) and remote control to navigate your stored music files on your connected USB memory device. Song/artist information will display on your HDMI-connected TV and the receivers front-panel display. USB devices that can be charged via USB will be charged when plugged into the AV receiver's USB port (5V/1A); even in standby mode.

Wireless Multiroom Audio Playback

HEOS Wireless Multiroom Audio: Built-in HEOS technology enables the AVR-S660H to become part of the HEOS wireless multi-room audio eco-system, allowing you to stream and control all of your local and online music effortlessly from anywhere in your home with the HEOS App on your compatible Apple iOS or Android mobile device over a wireless WiFi network connection. The HEOS system is a true multi-room audio system that automatically synchronizes audio playback between multiple HEOS devices so that your music (up to 24-bit/192kHz Hi-Res audio) coming from different rooms is perfectly in sync and always sounds amazing. You can play the same audio source in every room or any combination of rooms you choose, including a different song in every room.

Number of Systems & Groups: The HEOS wireless multi-room sound system by Denon can support up to 32 HEOS speakers, receivers, amplifiers, and/or pre-amplifiers (all sold separately) on a single wireless network (IEEE 802.11 g/n; 2.4/5GHz). You can join or group up to eight individual Heos devices into a group that function as if they were a single source. The HEOS eco-system is flexible enough where you can create up to 16 Groups (2 Heos devices per Group). You can easily group 16 rooms together with Party Mode by simply using a "pinch" gesture.

Compatible Sources: The receiver's input sources, HEOS music apps, and local network content can be distributed through a HEOS multi-room audio system. However, you cannot distribute an input source (analog, HDMI, optical/coax, USB, Bluetooth, tuner) that is different than the main zone of the AV receiver (this is a change from previous HEOS enabled AV receivers).

• Receiver's analog inputs & AM/FM Tuner
• HDMI (including eARC) and optical/coax digital inputs; will downmix multi-channel audio sources to 2ch (receiver's main zone will retain multi-channel audio decoding)
• TuneIn Internet Radio & Spotify Connect
• HEOS music apps (including Amazon, Pandora,Tidal, and more)
• Windows PC & DLNA music servers
• Bluetooth & USB audio
• Music libraries stored on your Apple iOS or Android mobile device.

Remote, App, & Voice Control

IR Remote: The Denon AVR-S660H comes with an IR remote for wireless operation of the AV receiver. It also supports HDMI-CEC and Smart TV Control.

• HDMI CEC: HDMI CEC allows you to link operation of the receiver with other audio/video components (like your TV, Blu-ray player, or satellite/cable box) that are connected via HDMI. Linked functions include Power On/Off, which turns the receiver On or Off when you power on or off an HDMI CEC connected component; and Source Switching, which automatically switches the receiver to the input of the HDMI CEC component that has begun playback. The HDMI CEC and certain functions within HDMI CEC can be disabled, if you prefer. Not all HDMI CEC compatible devices will function in the same way.
• Smart TV Control: You can even control the Denon AVR-S660H with your Smart TV remote via an HDMI connection and the HDMI CEC functionality associated with your Smart TV. Simply set "HDMI Control" to ON in the receiver, then set "Smart Menu" to ON and begin controlling the AVR-S660H with your TV's remote. The Smart Menu home screen provides you quick access to source and surround mode selections, the AVR's setup menu and four Smart Selects (or "Quick Selects").

HEOS App: You'll need to download the HEOS App (for Apple iOS 9.0+ and Android OS 5.0+) onto your compatible Apple iOS or Android mobile device to enjoy HEOS functionality through the AVR-S660H receiver. Using your compatible mobile device and the HEOS app, you can setup, browse, explore, and control HEOS system right in the palm of your hand, from anywhere in your home. Your compatible Apple iOS or Android device must be connected to the same home wireless (WiFi) network as the AV receiver and your entire HEOS system. The HEOS app consists of 4 control screens.

• Settings: The "Settings" screen enables you to connect one or more HEOS speakers, receivers, amplifiers, and/or pre-amplifiers to your home's wireless network.
• Rooms: From the app on your Apple iOS or Android device, you can select which rooms you want playing. You can play the same music in multiple rooms by grouping rooms together, or you can listen to a different source in each room.
• Music/Sources: You can select what music and which source you want to listen to from the app. Choose from online music services like Pandora, Spotify, TuneIn, Tidal, etc.; your stored music library on your Apple iOS or Android device, Windows PC/DLNA server, or USB thumbdrive; as well as the receiver's analog, digital, and HDMI inputs. You can also select music from Playlists you've created, Favorites you've saved, and your recent listening History.
• Now Playing: The "Now Playing" screen displays song, artist, and album information; along with Album Art. You also get basic playback controls like Play/Pause and Previous/Next Track, plus Volume controls Up/Down and Mute. In addition the "Now Play" screen functions unique to the selected online music service or music library.

Alexa Compatible: HEOS and Amazon Alexa customers can now enjoy the convenience of Alexa voice control plus high-quality wireless home audio. In addition to controlling your HEOS components with the HEOS app on your mobile device or tablet, you can now control them with Amazon Alexa voice technology and an Amazon Alexa device (such as the Echo or Echo Dot, sold separately). Your HEOS components and the Alexa-enabled devices must be on the same network. Voice control features include -

• Alexa voice commands include Volume (up/down, specific volume number, & mute); Playback (Play, Pause, Stop, Next, Previous, Resume); and Power on/off. The HEOS Bar and HEOS AVR even support HDMI switching (1-4) through Alexa voice command.
• You can group your HEOS-enabled devices using the HEOS app with an Alexa-friendly name. Once they are grouped, Alexa voice commands will control the group as a whole. If you want to play audio content from only one HEOS-enabled device in the group, you must ungroup the device within the HEOS app.
• You are able use voice commands to search for songs, albums and artists and even podcasts and internet stations from HEOS & Alexa compatible music apps - like Amazon Music, Pandora, TuneIn, iHeartRadio, Spotify Connect, & SiriusXM.

Google Assistant Support: Ask your Google Home, the Google app (for Apple iOS 12.0+ and Android OS 5.0+), or other devices with Google Assistant built-in to control HEOS content across your listening environment. Once you start music in the HEOS app, you can ask the Google Assistant to control volume, play, pause, skip tracks, and more. Once you have grouped your HEOS-enabled devices using the HEOS app, you can use the Google Assistant and voice commands to control a group of HEOS devices as a whole. Make sure the unit has the latest HEOS software and firmware update installed.

• A future firmware update (no ETA) will allow you to use the Google Assistant and your voice to queue up music services, power on/off devices, switch inputs and more.
• Click here for more info on Google Assistant for HEOS.

Josh.ai Smart Home Voice Automation: An elevated voice agent for the high-end smart home, Josh.ai offers flexible voice control for nearly any aspect of your day-to-day experience and entertainment environment. Use voice commands to control the Denon AV receiver, thermostat, lights, home appliances, powered speakers, and more. Josh.ai is installed by custom integrators and accessed through the Josh - Home Automation app on your Apple iOS 11.1+ or Android OS 4.4+ device.

AVR Remote App: The new Denon AVR Remote App (for Apple iOS 9.0+ and Android OS 4.0+) lets you control the Denon AV receiver using your compatible Apple iOS or Android OS mobile device. From this free app on your compatible Apple iOS or Android device, you'll be able to control the Denon AV receiver's basic functions; such as power, volume, input, surround modes, and other settings. In addition, you get unique features likes a landscape orientation control screen for tablet devices, the ability to create playlists, and control over a Denon Blu-ray player.

• Landscape Orientation Control Screen: With a landscape orientation control screen for tablet devices, you can easily browse and navigate through your network music services or personal digital music collection with ease, and at the same time view now-playing information and cover art all on a single screen.
• Create Playlists: The app's playback screen allows you to easily build your own personal music playlists on the fly with the ability to Drag & Drop files into your queue, or tap to "Play Now", "Play Next", "Play Next and Replace Queue" or "Add to End of Queue". You can then save your queue as a playlist for easy recall.
• Denon Blu-ray Player Control: The app allows control over Denon Blu-ray (DBT-xx13 series) that are connected to the AV receiver via HDMI.

Web Control: You can also control the Denon AV receiver from a web control screen on a web browser through your computer, tablet, or smartphone.

Convenience Features

OSD w/ Setup Assistant (via HDMI): Once you connect your TV to the AVR-S660H via HDMI, the exclusive Denon Setup Assistant appears on your TV screen to walk you through setup, step-by-step. With Denon's on-screen menu and setup assistant, you can connect, configure, and use your home theater system with ease. The OSD and setup assistant features clear on-screen graphics and text that optimizes critical system settings for your particular home theater setup.

• The on-screen menu and setup assistant is required for initial setup and is only available through the receiver's HDMI output.
• The video being played will not appear in the background of the menu when the menu is operated during playback of 4K/8K, HDR, or 3D video; or if the video aspect ratio is not 16:9 or 4:3.
• Performing operations on this unit during playback of a Dolby Vision signal may cause variance in the color display of the menu screen and operations content.

Quick Select: On the AVR-S660H's front-panel and remote, you'll find four Quick Select buttons that let you quickly choose from the most popular input sources (including HEOS Music). With Quick Select, the AVR-S660H remembers not only your preferred inputs but also your preferred audio settings, so you can enjoy precisely tailored sound with each one.

Input Rename & Delete: The AV receiver will automatically rename its HDMI inputs to the connected devices' names using HDMI CEC (the HDMI Control function must be enabled). You can also manual change the display names (up to 16 characters) of analog, HDMI, and optical/coaxia digital input sources. If an input isn't being used, you can delete it from the display so you don't have to scroll past it when you change sources.

Lock Functions: To prevent accidental operation of the AV receiver, you can disable operation of the buttons on the front-panel. You can also disable the receiver's IR sensor to prevent accidental operation of the receiver from the remote control.

Sleep Timer & Auto Standby: The Denon AV receiver features a programmable Sleep Timer and Auto Standby function. The Sleep Timer function allows you to automatically set the power to standby after a predetermined amount of time has passed; set the sleep timer up to 120 minutes in 10 minute increments. The unit will enter Standby mode automatically when no commands are sent to the unit for the set time (15/30/60 minutes). Before it enters the standby mode, "Auto Standby" is displayed on the front-panel display of this unit and the on-screen menu.

ECO Mode: This receiver is equipped with an ECO Mode function that allows you to enjoy music and movies while reducing the power consumption during use, Eco mode adjusts the maximum power available according to the volume level selected to reduce power consumption.

Personal Memory Plus: For each input, the receiver automatically memorizes the settings for input mode, surround mode, HDMI output mode, audio delay, etc. When the input source is switched, the settings last used for that source are automatically recalled. The surround parameters, tone control settings, and playback levels for the different output channels are memorized for each surround mode.

Protection Circuit: This is a function to prevent damage to components within the power supply when an abnormality such as an overload, excess voltage, or over-heating occurs. In this unit, the power indicator blinks and the unit enters standby mode when an abnormality occurs.

Software Updates: Using the receiver's network/internet connection, you can check for and update the latest firmware from the online Denon server. You can also set the receiver to automatically download the latest firmware and software updates when it is in standby mode. Visit Denon's Support Site for to check out the newest firmware and software updates.