The PRIME R750-1D is an ultra-efficient mono amplifier that can produce 750 Watts into a 1-Ohm load without taxing the electrical system. The frequency response of the R750-1D is optimized exclusively for use with subwoofers. 
The Prime R750-1D amplifier offers high efficiency through the implementation of its Class-D circuitry while delivering rich, full bass to any system. This amplifier is optimized for subwoofers with the implementation of an infrasonic filter to keep those ultra-low (inaudible) bass notes from damaging your subwoofer system. Match with a 4-channel stereo amplifier for your mids/highs 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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Infrasonic filter
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On-board Punch EQ with +18dB boost @ 45Hz.
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RCA pass-thru outputs
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Real time output and power supply thermal sensing
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Cast aluminum heatsink
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Top mounted controls
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4 Gauge power/ground connectors
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MOSFET power supply
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Short circuit protection
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Muted turn on
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1 Year Standard Warranty