About the Kenwood KAC-M1804
Power your speakers on land or sea
Power your speakers on land or sea
Kenwood's KAC-M1804 4-channel amplifier will pump up your car's audio system with 45 watts RMS per channel — that's more than twice the power of most car stereos. The super-compact KAC-M1804 will add new clarity and impact to the basic sound system of almost any kind of vehicle on land or water, and it'll fit in a lot of places when space is tight. The amp uses plastic covers to protect its connections and features a conformal coated circuit board that keeps out moisture and salt, so the party won't stop just because of a little wetness.
Hooks up to almost any system
The KAC-M1804 comes with an RCA cable for connecting to an aftermarket receiver, but it can handle speaker-level signals as well, so you can still get input from a radio without RCA outputs (Crutchfield recommends using the Kicker KISL adapter to allow you to keep the RCA leads from your amplifier). The amp senses incoming high-level signals and turns itself on, eliminating the need to install a separate remote turn-on wire.
- compact 4-channel amplifier for car, motorcycle, and boat
- 45 watts RMS (100 watts peak) x 4 at 4 ohms
- non-bridgeable, 4-ohm stable per channel
- CEA-2006 compliant
- MOSFET power supply and Class D amp technology
- conformal-coated circuit board — suitable for marine applications
- preamp and speaker-level inputs
- signal-sensing turn-on on speaker-level inputs eliminate need for a separate remote lead
- RCA cables and short power/speaker harness included
- 10-gauge power and ground leads recommended
- fuse rating: 15A x 1
- dimensions: 6-1/2"W x 1-3/8"H x 3-9/16"D
- warranty: 1 year
- MFR # KAC-M1804
What's in the box:
- 4-Channel amplifier with a 15A ATM fuse installed
- Two 38" RCA stereo patch cables
- 5' Power and speaker output harness
- 4 Self-tapping screws (Length=5/8")
- Two 13.5" plastic wire ties
- Two 4" plastic wire ties
- Instruction Manual/Warranty sheet
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More details on the Kenwood KAC-M1804
Features & specs
|RMS Power Output (Watts x Channels)||
45 x 4 |
|Peak Power Output (Watts x Channels)||---|
|Power at 2 Ohms (Watts x Channels)||N/A|
|Bridged Power (Watts x Channels)||N/A|
|Minimum Impedance Bridged||N/A|
|Minimum Impedance Unbridged||4|
|Best Frequency Response||20-20000 Hz|
|THD at Rated RMS Power||1%|
|Signal to Noise Ratio||74 dB|
|Low-Pass Crossover Frequency||N/A|
|Low-Pass Slope (dB/octave)||N/A|
|High-Pass Crossover Frequency||N/A|
|High-Pass Slope (dB/octave)||N/A|
|Bass Boost Frequency||N/A|
|Speaker Level Inputs||---|
|Parts Warranty||1 Year|
|Labor Warranty||1 Year|
Compact Amplifier: The Kenwood KAC-M1804 compact Class D 4-channel amplifier is designed to boost the output and clarity of your car stereo. The amp features a conformal coating on the circuit board to protect it from moisture. This allows you to use the amp for marine applications, or on All-Terrain Vehicles (ATVs). The KAC-M1804 delivers 45 watts RMS x 4 channels at 4 ohms. It cannot be bridged or operated at impedances less than 4 ohms.
Protection Circuitry: The amplifier features protection circuitry for thermal overload, DC offset, and short circuits. The amp stops operating when it goes into protection mode. (There are no LED indicators.)
Signal-sensing Turn-on: When the amplifier is connected to a factory head unit, or an aftermarket unit without preamp outputs, you can cut off the amp's RCA input connectors and splice the head unit's speaker wires to the input wires. In this case, the amplifier's Signal-sensing Turn-on feature will turn on the amp when a signal is detected on the input. This eliminates the need to connect a turn-on lead to the amp's Power Control (blue) wire.
No Controls or Crossovers: The KAC-M1804 does not have built-in crossovers or controls. If you are connecting the amp to small speakers, it is recommended that you use the crossovers built into the connected head unit, or use bass blockers on the speaker outputs.
Amp Wiring: The Kenwood KAC-M1804 is equipped with a 22-pin DC connector on the amplifier. The included 5' DC harness, which plugs into the connector, has wires for +12V battery power, ground, power control (turn-on lead), and four speakers.
Power/Ground: The +12V Power and Ground wires are 16 AWG wires. The power wire can be connected to the car's fuse box or directly to the battery. The amp is protected by a 15A ATM mini blade fuse. If wiring directly to the battery, you can use a 10 AWG wire with an in-line 15A fuse installed no more than 18" from the battery terminal. The ground wire should be attached to a metal area close to the amplifier.
Power Control: The blue Power Control wire should be connected to the head unit's remote turn-on lead when an aftermarket unit is used. This wire does not need to be connected if you're using speaker level inputs. The Signal-sensing Turn-on feature will turn on the amplifier when an input signal is detected.
Line-Level Inputs: The amplifier is equipped with two pair of RCA inputs on 7-1/2" pigtails for connecting stereo RCA patch cables from the head unit to the amp. Two 38" stereo RCA patch cables are included. If using a factory head unit, or a unit without preamp outputs, the RCA inputs will also accept a speaker level signal. The RCA jacks can be cut off, and speaker wire spliced with the existing cable, but adding a speaker level to RCA adapter is much easier (sold separately).
Speaker Outputs: The included DC harness has eight wires for connecting four speakers to the amp: Front left (white + white/black), Front right (gray + gray/black), Rear left (green + green/black), and Rear right (purple + purple/black). The amp is not capable of bridging or connecting to speakers with impedances less than 4 ohms.
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