The Power T1000-4ad is a 4-channel amplifier that combines the sound quality characteristics of a Class-A design with the efficiency of a Class-D in one remarkable package, offering high fidelity in a full-range configuration. 
The T1000-4ad combines sound quality characteristics of Class-A designs with efficiency of a Class-D in one remarkable package. Superior sound quality is possible through the implementation dynamic switching frequency control. The addition of Constant Power circuitry produces optimized output at a range of impedances. Rockford Fosgate created Class-bd for brute power to run low frequency subwoofers, and now Class-ad offers high fidelity in a full-range configuration. 
 Features
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2/4 channel switch
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24dB/octave crossover
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4 Gauge power/ground connectors
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Audiophile grade speaker connections
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MOSFET power supply
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MOSFET output stage
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RCA pass-thru outputs
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2 Years Standard Warranty