Mike, you should never post on this site again clearly your ears are not gold like the rest of us. Although I am special mine are diamond encrusted platinum

. I hear differences between my gear if I change my socks! Its like a night and day difference when I wear wool socks vs cotton. I mean the wool just builds up so much static electricity on my rug and loads all my speaker cables with EMI. I really need to raise my wires higher and wrap them in ERS paper

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Quit worrying so much about your receiver and focus on speakers more! I bet blind folded your friends would hear even greater differences between nicer speakers than they did with the receivers.