How are you hearing no difference?

There are so many factors involved it’s almost absurd. You got your time of day, you got your day of the week, you got weather conditions, I.e., high low pressure system/rain soaked ground, mistakes in the system, hearing issues, among many others.

I've bought stuff assuming it would sound great and been disappointed (rare, but some recent well regarded speakers failed me), but have also been very surprised here and there...my current fave SE tube amp...some Schiit items...efficient horn speakers...all exceeded my expectations.

Cleeds ,I can't remember how to quote a post so here it is ,as proof just think back to just how many power cable and interconnect threads get locked , It never ends up good ,first and foremost audiogon is a for profit business ,not that that's a negative but don't think they will allow any posts deemed to undercut sales of advertisers ,and I don't blame them because it's not like we're ever going to resolve this issue ,the hundreds of locked & deleted threads about cables and the magic brick guys were putting next to their TT is plenty of evidence .