Are integrated amps technically better than separates?

I would like to share my PC experience, however, I will not mention the "high end/boutique" brands used.

The amps I use are Krell KAS dual chassis monoblocs.  These, have a built in volt meter on the bottom chassis, which show/read power coming in directly from the wall outlet. Changing/swapping out PCs has a direct effect on what the incoming volts are and thus what is illustrated on the built in meter.  Unless the amps are biased to any one PC, the volt reading changes in regards to the PC used...and so does the sound quality.

Best,
Jose