The PRIME R400-4D is an ultra-efficient 4-channel amplifier producing 100 Watts into four channels at 2-Ohms. Run a 4-way full-range system or use it with components on the front channels with subwoofers on the rear. 
The Prime R400-4D amplifier offers high efficiency through the implementation of its Class-D circuitry while being able to power a full-range system. This amplifier is optimized for 4-channel front/rear systems so you can run midrange/tweeters in the front doors/dash while running midrange/tweeters in the rear doors/deck. Match with a mono amplifier for subwoofers and you'll have a Rockford Fosgate system that any Car Audio Fanatic will envy.
Features
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    12dB/octave Butterworth crossover
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    RCA pass-thru outputs
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    Tri-stage protection covers thermal, over-current and short circuits.
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    On-board Punch EQ with +18dB boost @ 45Hz.
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    2/4 channel switch
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    4 Gauge power/ground connectors
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    Cast aluminum heatsink
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    Top mounted controls
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    1 Year Standard Warranty