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SK-M4004D | 400 Watt 4-Channel Car Amplifier

  • The Skar Audio SK-M4004D full range class D four channel amplifier is part of the new mini amplifier series product lineup from Skar Audio. The SK-M4004D was engineered to be compact, but provide the power and reliability expected out of larger amplifiers. Featuring a high speed MOSFET power supply, and an efficient Class D design, this amplifier is powerful, reliable, and extremely versatile.

    The SK-M4004D makes for a great amplifier in applications where space is limited but power cannot be sacrificed. In addition, this four channel amplifier features high level input connections for those installations that lack an RCA connection. In addition to the high level inputs, this amplifier also utilizes an adapter harness for the speaker outputs allowing for an easier installation.

    RMS Power @ 2 Ω 140W x 4 Ch (14.4v)
    RMS Power @ 4 Ω 100W x 4 Ch (14.4v)
    Power & Ground Input Size 8 Gauge
    Preamp (RCA) and Speaker Level Inputs Yes

    *Skar Audio always recommends professional installation for all of our products.*

    *Never mount amplifiers directly on the enclosure*

    • Compact "Mini" Class D Full-Range Four Channel Car Amplifier
    • The compact design of this amplifier series allows for maximum versatility
    • RMS Power at 2 Ohms: 140 Watts x 4 Channels (14.4v)
    • RMS Power at 4 Ohms: 100 Watts x 4 Channels (14.4v)
    • RMS Power at 4 Ohms (Bridged): 270 Watts x 2 Channels (14.4v)
    • Frequency Response: 10Hz - 40kHz
    • Working Voltage: 8.5V - 16V
    • Signal-to-Noise Ratio (Sensitivity): 85dB
    • Efficiency at 4 Ohms: 86%
    • Damping Factor: 100<
    • Low Level Input (Gain): 8V - 0.2mV
    • Hi-Level Input Connections: Yes
    • Speaker Output Adapter Connection: Yes
    • Crossover Control: HPF / Full-Range / LPF
    • 4-Way Protection Circuitry Built-in (Thermal, Voltage, Speaker, DC)
    • LED Power & Protection Indicators
    • Fuse Rating: 40 Amps
    • 8 Gauge Power and Ground Input Terminals
    • Dimensions: 7.9" (Length) x 4.6" (Width) x 1.7" (Height)

    Channel 1/2 Crossover

    • High-Pass Filter / Full-Range / Low-Pass Filter
    • Variable Crossover Frequency Range: 50Hz - 500Hz

    Channel 3/4 Crossover

    • High-Pass Filter / Full-Range / Low-Pass Filter
    • Variable Crossover Frequency Range: 50Hz - 500Hz

    Click Here to Download the SK-M Amplifier Manual

  • Customer submitted photo gallery coming soon..

  • Product videos coming soon..


Customer Reviews

Based on 139 reviews
Good customer service

I only can complain about the inputs. I wish the inputs weren't pre assembled on the clip so I could use my own wiring

Great Little Amp

I bought 2 of these during the sale event and installed one in my daily F-150 Super Crew, and just finished the second one today in my daughters Mustang. There are rumors of heating issues but haven't experienced any yet. These little amp sound great. I'm very impressed with their small size and great sound quality as well as the level. I definitely recommend this amp especially when a small size is needed.

So-m4004D 4 channel amp

Great definitely does the job love the size very compact and just looks perfect in my car

Skar build

I love it it work for my build

Decent Compact 4 channel

Its a decent amp but the first thing I noticed is that the gain pots are backward. They go from 0.2 to 8v and you would think that 8v is Max but that is not the case (at lest on mine?). Make sure you tune these amps with a sine wave tone generator, a multimeter, oscope, or an SMD DD1 to make sure you aren't clipping your signal.
For the price though its a decent amp and it fits basically anywhere. Good value for the money.

Skar, please consider changing the printed gain indicators to Min-Max to avoid confusion or at least ensure the pots attenuate in the proper direction. This was very confusing initially.

Photo: SK-M4004D is mounted on the right.

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