This is by far my favorite online audio group that I visit, but where some groups are overly interested in cables, amps, etc...this group seems to be just as overly dismissive of these things.
One thing I will add to this conversation is that though you suggest there should be no audible difference in amps, you go on to compare receivers. There's a difference. The amp is only one small part of a receiver. There's a hell of a lot more going on in that little box than sending power to the speakers. So even if all amps are sonically the same, all receivers won't be.
