Think of it like an adjustable transformer, filter, and energy storage device all in one. I don't have the schematics, but that is the way it is described.

Adjustable Transformer: The nominal case is a 1:1 turn ratio transformer. The output voltage follows the input voltage. But if the turn ratio is adjusted up when the line voltage decreases and it is adjusted down when the line voltage increases, then the output can be held constant.

Filter: Eliminates noise by providing attenuation >> 60HZ

Energy Storage: Because a filter limits current, a large enough capacitive output is required to restore the peak current values.

A good test for connecting your amp into such a device is dynamic range (large crescendos in classical music?). If you give it a shot with your amp, please report back.

DSP6000, DSP5200, DSP5500VC, P300W, SW1600, G68, 568.2, HD621, G57, G55, Oppo BDP-105.