they supposedly run up to 125 watts class A
Wow! They must be HUGE (even with a switching PS)... We're talking about a +500 VA PS per channel for class A... Now that's a nice monster!
BTW, if they claim 125/channel class A, they must be able to back it up; so, you probably DO have 125W one way or another (but it does sound like overkill as you note...)