Mono amplifiers are primarily used to power the subwoofer speaker or speakers in the car audio system. Sometimes, if the budget allows, you can use 2 mono amplifiers in a very high power dual-mono set up.
The JL Audio XDM600/1 is a Monoblock Class D Car/Marine Subwoofer Amplifier with a rated power of 600 W x 1 @ 2 Ω and 400 W x 1 @...