Kenwood KAC-M3004 review – The compact amplifier that can handle anything you throw at it

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The Kenwood KAC-M3004 is an amplifier that will be perfect if you need something compact and of good quality. Even more so if you want to install an amplifier on your motorcycle or water vehicle, as it is resistant to dirt and moisture.


  • Compact
  • Your audio is clean and clear
  • Water and dirt resistant
  • Versatile


  • A little expensive compared to others
  • The amplifier is too small for standard 4-channel connections


The Kenwood KAC-M3004 is a powerful, compact, 4-channel amplifier for your car.

It has happened to all of us that we are on a car trip and suddenly we feel like turning up our radio because a great song appears that we want to hear at full volume.

But we have also had to suffer the terrible “pop-up” or backfire, along with the loss of quality, which suffers the factory radios that come in most cars to turn up the volume.

Forget about this problem with the Kenwood KAC-M3004, you can boost all your music with its 50 watts RMS power per channel. And because it’s so compact, you can fit it almost anywhere without a problem, even on a motorcycle.

Something we have loved is that you can install subs, thanks to its 4 channels.

Another thing that we loved about this amplifier is that it has proved to be very versatile, as it accepts the signal from almost any source. We have tested it with RCA cables, even with the factory stereo radio. Also, it turns on only when it receives a signal, so you don’t need an additional power cable.


Compact and resistant to humidity

The amplifier has a compact construction, which is coated to protect it from moisture and dirt. This allows the Kenwood KAC-M3004 to be used on motorcycles, off-roaders, or marine vehicles (among others).

In the case of using its channels, we will also have to take into account that its RMS output at 4 ohms has a power of 50 W. While at 2 ohms it has a power of 75 W. We will have to choose what type of configuration we want.

Circuit protection

Apart from the coating that covers it with moisture and dirt, it has a thermal protector that turns it off when it gets too hot.

Power on with signal detection

Something very popular and convenient that prevents us from having to use an ignition cable.


This amplifier is divided into two parts, A and B (independent. Each can be configured for high-pass or low-pass operation or turned off for full range operation. This is great for different configurations.


Can be mounted on an installation plate (5/8″ thick or more).

Box Contents

  • 4 channel amplifier with a 30A ATM mini-fuse installed
  • 9″ speaker output harness (8-pin Molex plug on one end)
  • 4 screws (M4 x 16 mm)
  • Two 13.5 ” plastic wire ties
  • Self-adhesive transparent plastic protective covers for controls (2 sheets)
  • Instruction manual / Warranty card


Power connections / power control

These are 0.35″ wide screws. We will need a 10 gauge wire (minimum) to provide power and ground.

Power control

This cable has to be connected to the remote power supply when using secondary units. We will not need it if we are using speaker inputs. This controller will be in charge of turning on the amplifier when it detects a signal.

Speaker output

With 8 x 16 gauge wires to connect the speakers to the amplifier. These can be connected to a 4 channel system, a 2 channel high power system, or a 2 channel + subwoofer system.

For installation, we recommend that you follow the manual or a video, as it cost us quite a bit.

Line level inputs

It has two stereo RCA inputs. We can decide to use a factory unit or a unit without preamplifier outputs, but we will have to splice the speaker cables to an RCA plug.


  • Max Power Output: 600 W
  • RMS Power Output (Watts x Channels): 50 x 4
  • Power at 2 Ohms (Watts x Channels): 75 x 4
  • Power at 4 Ohms (Watts x Channels): 50 x 4
  • Amplifier Class: D
  • Bridgedable: Yes
  • Bridged Power (Watts x Channels): 150 x 2
  • Best Frequency Response: 20-20k Hz
  • Signal to Noise Ratio: 87dB
  • Input Voltage: 14.4v
  • Width (inches): 7-5/8
  • Height (inches): 1-13/16
  • Depth (inches): 3-7/8
  • Warranty: 1 year


Last update on 2024-06-14 / Affiliate links / *Image Disclaimer: We use images/data from Amazon Product Advertising API solely on products that link to Amazon. On products with the "Price at Crutchfield" button, we use images/data from as per the partnership deal.

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