its frustrating as I can't afford an amp to replace my 59TXi which I like the SQ of - but there is definately (IMO) considerable difference in sound quality without EQ on from AVR to AVR
I desperately want to go all digital and HDMI and get rid of my Pioneer but only with equivalent SQ - and you can see from the below that I've tried ... !
I've owned the following:
Arcam AVR500
Pioneer 59Txi
Denon 4311
Pioneer SC05
Yamaha 3800
and home demoed: Yamaha 3067
the top 2 sounded far better in my system - even without EQ than the others. I even went to the trouble of switching between the above and my Pioneer in quick succession, ie play part of a movie, got removing all cables etc and replacing down to about a 15 min swap-over. Note as well that the Pioneer was being compared to the others (apart from the Arcam) with legacy DTS/D.Digital vs lossless formats bitstreamed on the others and it still sounded better
it could be my speakers, my front 3 are older Tannoy Revolutions which are not easy loads (although nothing special) - 6 ohms @ 88dB, and I'm running a 7.1 system. So the amps are having to drive 7 speakers, that said I'm running a 80hz crossover (as I have a SVS-PC-Ultra 13) - so load shouldn't be bad at all. Only thing I haven't tried (as couldn't afford) is one of the above mid-range avrs + external power amp.
I would have kept the Arcam - as that was the best sounding AVR I've heard - but I had stability issues and quite a few bugs - and in the end had to return for a refund
anyway back on topic- I much prefer an EQ I can tailor to my needs - without forking out lots of money for a pro kit
NOTE: the amps I've listed apart from the 3067 - I have genuinely owned, and used in my own room and own speaker setup, I had a long chance to play with them - so these were not quick comparisons. Note also I've probably "lost" (buying and reselling when disappointed) easily > $700 trying to find a replacement.