My amp has no faults

Well, you know, you take any really inherently good amp and isolate it from structureborne vibration and you wind up with a much better amp. There is really no way to do that without resorting to means external to the amp. Or, take an inherently good amp and replace the amp's stock power cord with a better power cord and you wind up with an even better amp. I also suspect that if amp manufacturers started to pay attention to wire directionality and were consistent throughout the entire amp with respect to wire direction, including all point to point wiring, transformer wiring, etc. then you would begin to see some sort of revolution in amplifier sound.

I'd opine the Bada hybrid SET headphone amp is one of the very best sounding amps I've heard, regardless of price. The sound of the Bada out of the box without, you know, breaking it in and isolating it and rolling the stock Chinese 6SN7 tubes, is excellent, but the sound gets quite a bit better when attention is paid to tube dampers, isolation, contact enhancers, things of that nature.

Actually most amps and speakers are up to the task of playing at moderate to high volumes without the distortion driving you out of the room, but the plain fact is that other things, some things that go bump in the night, produce the distortion. Unfortunately, speakers and amps get a lot of the the blame. The distortion I'm referring to, the distortion you hear when the volume is turned up, is at least an order of magnitude higher than a modestly priced amp's total harmonic distortion.