Contact us
Close contact box

Kenwood KAC-M1804

Compact 4-channel amplifier — 45 watts RMS x 4

Item # 613KAM1804

Kenwood's KAC-M1804 4-channel amplifier will pump up your car's audio system with 45 watts RMS per channel —...

Kenwood's KAC-M1804 4-channel amplifier will pump up your car's audio system with 45 watts RMS per channel —...

Need help?
Contact our Virginia-based experts.
Discontinued item
5 questions - 6 answers

Item # 613KAM1804

About the Kenwood KAC-M1804

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.

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. The amp senses incoming high-level signals and turns itself on, eliminating the need to install a separate remote turn-on wire.

If your receiver's power circuit is protected by a 15-amp or larger fuse (check your fuse box or owner's manual), you can tap into it to power your KAC-M1804. Otherwise, you'll have to run a power wire to the battery and install a 15-amp inline fuse as close to the battery as possible.

READ LESS

Product highlights:

  • 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: 90 days
  • Our 60-day money-back guarantee
  • MFR # KAC-M1804

What's in the box:

  • Refurbished 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

Customer reviews

Loading reviews...

Kenwood KAC-M1804 reviews

Average review:

12 reviews

Thanks for submitting your review

Filter by rating

Customer photos

Sort reviews

Sort by:
Items per page:
View page:

Verified customer (What's this?)
Verified employee purchase (What's this?)

Pros:

Cons:

Crutchfield response

<< >>

Product Research

Features
Connections

Features

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.

Connections

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 pairs 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, you can cut off the RCA jacks and splice the four speaker wires to the two inputs, maintaining the same polarity.

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.

Loading accessories...

Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Compact [ Brody  May 04, 2019 ]
A
good reviews and price [ Mike  Dec 01, 2018 ]
A
Special price and by the size. [ ANGEL  Sep 13, 2018 ]
A
I need to replace the factory amp in my lexus ls430 and it seems to be the rite size. [ MARKHAM  Nov 03, 2017 ]
A
To go with a deck and speakers I previously bought. [ DAVID  Oct 07, 2017 ]
SHOW MORESHOW LESS

5 questions already asked

Q
Would it be safe to use a Rca splitter out of the head unit to connect to this and a powered sub?
[ Adam  Dec 06, 2018 ]
1 answer
A
Yes. If your stereo does not offer enough RCA pre-amp outputs, you can use RCA Y adapters to create an additional pair. For additional assistance and personalized recommendations, feel free to contact us directly by phone or through out online chat service: https://www.crutchfield.com/support/ContactUs.aspx
[ Ryan  Dec 12, 2018 ]  Staff
Q
I have a pioneer head and would like to use this amp on my 2door and 2 rear speakers but the rca rear speaker outputs are connected to an amp powering two larger midrange speakers. Can i still use this amp as well wiring inline from the wire speaker outputs?
[ Paul  Jun 02, 2017 ]
1 answer
A
you shouldn't have any problems. you may want to buy an line level amp schoche makes one for less than $30 that will convert your high side speaker level inputs back into 4 ch rca's.
[ Lacey  Jun 04, 2017 ]
Q
I bought a compact Kenwood 4-channel amplifier and I'm trying to use it on my newly purchase Sony receiver with the RCA's that are supplied have front and sub RCA's will this amplifier work?
[ Louis  Nov 14, 2015 ]
2 answers
A
Yes it will but not to power a sub, you need a mono amp for the sub, also amp isn't powerful enough for a sub
[ Dale  Nov 15, 2015 ]
A
I don't think the sub output would work with the Kenwood amp. It sounds like your receiver is three channel and the compact amp works as the mid and high range amp in a four or five channel system.
[ James  Nov 15, 2015 ]
SHOW MORESHOW LESS

Loading articles...

TOP