Its not that listening tests are disingenuous for all but speakers, but that unless the electronics are bad, any listening test done for electronics will reveal no real evidence of anything. The whole point is that unless electronics are specifically calibrated to alter the sound, or are poorly constructed in the first place that no difference will be made in the sound comming from the speakers.
But then I take an audioholics review at random (the first amp/reciever-amp I got in the pro reviews section) and there's a page on how it sounds:
http://www.audioholics.com/reviews/receivers/onkyo-tx-sr805/tx-sr805-listening-tests
And it's not just discussing whether it decoded 7.1 or not. From the review:
In comparison to the reference Rotel, the differences tended towards effects at the audible frequency extremes. The Onkyo did not sound quite as detailed or have as much spacial depth.
Should this review be indicating that the Onyko has "bad electronics"? Because it certainly seems to be saying that the amp has a different sound than another amp.
Anyone claiming that switching out a $400 DVD player for a $1000 one results in a more clear and defined sound has the onus on them to prove it. Just saying, "It does sound clearer to me, regardless of what other people think." proves nothing other then that your wishful thinking. The caveat being of course, that both components are not defective and that neither one was calibrated to alter the audio in either case.
Of course, the axiom for claims is supposed to be "all things are possible, no things are true" until otherwise proven.
Personally, I'm a fan of $35 computer DVD players. They read the data perfectly... now as to the decoder/DAC...
But I digress. I suppose my first point is that Audioholics, as a matter of course, rates the sound quality from well-built non-speaker electronics. Then, in this article, they seem to be telling me that electronics don't have sound.
I personally don't know. I've not really tried comparing various amps in blind tests. I do know that I have an unexplained and easily heard issue with sound from CDs coming out of my BlueRay player. I'm beginning to suspect a problem with the fiber port on the unit, but that looks like it will come back to the "defective" exception.
What I do know is that the claim (no sound fomr electronics) and the fact that audioholics rates the sounds of electronics seems to be paradoxical. Perhaps there is simply something about the claim I have misinterpreted?