No - Optional - 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.