I disagree. A mid range AV receiver will not sound as good as an IA or top end receiver.
In my experience, you are wrong.
Have you listened to a McIntosh receiver driving a pair of good speakers?
Yes.
I have, and the Denon AVR750 sounds flat. Not about the power necessarily, but the specs, and the way each company designs the sound circuitry. Not mention tube vs IC.
For someone who has heard the intense depth imagery and quality of audiophile systems, the end result is personal preference.
Ever heard of the placebo effect? Expectation bias?
I have.
Here's an interesting example of a proper DBT that refutes what you're saying.
I fully believe if you were to compare between an "audiophile" amp and that receiver you have now in a DBT you wouldn't be able to consistently tell which was which, as long as all else is equal and both are operating within spec. To my knowledge no one has yet, tho a true DBT is a pain to set up and get right so you don't see them done very often.
Btw, this is my experience with Mcintosh...
I think what I have right now rivals the sound I heard from that system at a fraction of the cost for amplification. So tell me something... where do you stand when it comes to expensive cables and interconnects..?