Hi Dave,
Very true, again I am admittedly not overly familiar with TX-8511 model, other then going to the Onkyo site and looking over the specs. Which from that it seems that it should do the job for a home stereo more then adequately, it is not an HT receiver so for that job I agree he would benefit from adding some external amps, but do you really feel that there would be an appreciable difference on the sound quality by upgrading the amp at this point for stereo purposes. I agree with Chesseroo comments that he can hear the difference from the 10 year old techniques unit. There have been a lot of advances in audio designs and DSP technology in the past 10 years so I would that you can, but looking at the Onkyo Web site this is not that old of a receiver, it is still current on the web site, and by the specs for stereo it should do the job very well.
I have tried the M22’s recently about 2 weeks ago when my sister bought a pair for her HT and I agree that they are no slouches, but when running them on the 3 different receivers that I have I could not hear any appreciable difference on these speakers from my Yamaha 995 to the Denon 3802 to my 5800. In the end I sold her my 3802 for her system. Am I missing something? What can you tell me about the 8511 that would make you feel that there would be a big benefit, and I am not meaning to go to an HT receiver from the stereo receiver.
Cheers, I look forward to the reply