Pass labs XA60.5 anything wrong with them.

60 Watts is a lot of power even for speakers not so efficient. Lets say you have a speaker that outputs 89dB at 1Watt/1meter. That results in an SPL of 97dB at 3 meters with 64Watts. That is pretty loud unless your goal is permanent hearing loss. 100dB is standing next to a pneumatic jackhammer, for example. I guess the question is does a class A amp still sound as good at maximum output as it does at 1 Watt.

For sure, total dynamic range must be considered. If you have your stereo volume set for the quietest passages to be at 40dB or so, just above the average room background level, then you have 57dB of headroom (considering 97dB max). Of course, I typically have my volume set at a point where record background noise is just audible on my quietest records at the lead in groove. I think that gives me somewhere around 40-50dB of headroom which can get pretty loud, and then my wife makes me turn it down. In general, speakers have a linear output of SPL (in dB) vs. power up to around 100-105dB- some less, some more. That is a generalized statment- better to consult your owners manual for more accurate specs. What that means is you can pump more power into the speakers but they will not get much louder. Some of that extra power will just turn into smoke:)