looking at this amp few ?

[warihayd]

MB Quart DSC 1000.1 (dsc10001) Mono Subwoofer Amps Car Amplifiers Car Audio Car Audio, Video, & GPS Navigation - Sonic Electronix




what is Unbalanced RCA inputs.

and


PWM (Pulse Width Modulated) MOSFET power supply is this better than say normal mosfet chip

[Perry Babin]

Unbalanced RCA inputs means that it can't accept a signal from a source that has balanced output (signal on both the shield and the center conductor). Most amplifiers have unbalanced inputs.

PWM means that the drive signal to the FETs can vary in duration to allow for regulation of the rail voltage. Many amps claim to have PWM supplies do not vary the pulse width so they are not actually PWM supplies. This applies to the drive/control circuit and has nothing to do with the FETs.