I have a 400.1 Kicker AMP I am selling. I upgraded to a 600.1 by kicker and have no use for the 400.1 anymore. The amp is $279.99 NEW from the Store.
Ill sell it for $150.00 OBO.
Let me know if interested. Local to NJ you can pick it up or I can take it to you. Out of state You pay shipping.

Specs.
Kicker Mono Subwoofer Amplifier (KX400.1)
Class D mono subwoofer amplifier: Provides massive power to your subwoofer without drawing lots of power from your system.
Power output: 200 watts RMS at 4 ohms or 400 watts of peak power at 2 ohms.
Protection Circuitry: Protects against short circuits, overloads, heat and reverse polarity.
Expansion options: Speaker-level and RCA inputs make it easy to add on to your system.
Low-pass filter: Filters out all of the low frequencies and keeps them flowing to your sub for maximum bass response.
MOSFET circuitcity: Runs cooler and more efficiently.
Remote bass control: Place the controller on your dash or console to change the amount of bass going to your subwoofer without having to leave the driver's seat.
Removable endkaps: Conceals and protects the wiring on the ends of the amplifier. They can be painted to match the inside of your car for a cool, custom look.
Power kit and RCA cables required.

Kicker Mono Subwoofer Amplifier (KX400.1)
KKR 04KX4001
• 200 watts RMS at 4 ohms
• Low-pass filter
• Protection circuitry • Speaker-level & RCA inputs
• Remote bass control
Price was: $299.99
You save: -$20.00



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You pay: $279.99

I had this in my MINI. Its awsome I had one 10" compVR hooked up to it and the sound was great.
I now own a e90 330 so i moved up to a 600.1 by Kicker.