Class âBâ amplifiers have no current flowing through its outputs with no audio signal.
4 4 Channel Car Amplifier 800 Watts, Full Range, Class A/B, 2-4 Ohm Stable, Mosfet Power Supply, Bridgeable.Efficiency is the name of the gameFull Range - With a Full Range amplifier you not only have the option to run your speakers, but also your subwoofersVariable Gain Control - The gain control is not for adjusting volume..4 4 Channel Car Amplifier 800 Watts, Full Range, Class A/B, 2-4 Ohm Stable, Mosfet Power Supply, Bridgeable Planet Audio AC800.