To power up your sub-woofers, install a mono amplifier. Among many features of a mono amplifier are low frequency reproduction, built in bass boost and low pass filters. A class D mono amplifier brings out less heat, are more efficient and draws less current.
A 2 channel amplifier can operate two channels from a single box which is intended for a left speaker and a right speaker. A bridged 2 channel amplifier is designed to operate inline with the effect of a more powerful one-channel amplifier. Features include MOSFET transistor outputs, MOSFET power supply, PWM circuitry, full selectable crossover and more.
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.
6 channel amplifiers are a great solution to upgrade your factory or aftermarket car stereos. A 6 channel amplifier has 4 channels for your 4 full range speakers plus two channels for your subwoofer. The crossovers and adjustments are built in. A 6 channel amplifier makes your system sound better.
Bass Controls can be remote and parametric. It often has PFM subsonic filter and bass level manipulations. Bass Control knobs can be flush mounted for convenience.