Yes - 4 Channel Car Amplifiers

In the case of a 4 channel amplifier, use two channels to drive a pair of full-range speakers, and bridge the other 2 channels to power a sub-woofer. Among many features of a 4 channel amplifier are remote sub-woofer level control, tri-mode operation, bridgeable channels and max bridged power to 1000W. Four channel car amplifier provide users multiple input/output selectors to power up to four devices. This is great if you need to power an entire sound system.

Pioneer GM-DX874 1,200 Watt Class D 4-Channel Car Amplifier
$269.99
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GM-DX Series 1,200 Watt RMS 4-Channel Class D Car Amplifier
Class D Design Offers Efficiency and High-Quality Sound
Continuous Power Output (1 Ω, ≤ 1% THD+N): 125 W x 4
Continuous Power Output (2 Ω, ≤ 1% THD+N): 150 W x 4
Continuous Power Output (4 Ω, ≤ 1% THD+N): 100 W x 4
Bridged Power Output (4 Ω, ≤ 1% THD+N): 300 W x 2
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