Well also for $1500 you can’t get expect to get that much. It’s still a budget alternative so if you would add an amp you would get that extra power needed. Even though there are better receivers out there with better amps in them for the same price.
It's not really that budget an alternative - what is being considered is the DSP - the surround processing - not the amplification.... and not even the DAC's.
Miker 1102, finds that his budget Sony AVR - (sub $500?) is doing a better job with Music surround, than the $1300 Onkyo/Integra...
To me there is no logical, justifiable reason for this, other than a difference in the setup/tuning of the surround algorhythms, or the adjustment of the surround system - ie: relative levels etc...
If both are using Dolby Surround, DTS or THX - the differences in "Direct" mode should be negligible - down to different DAC's and Amps - but apparently they are not.
He is reporting good results with movies - and poor ones with Music - and without hearing his system, it is well nigh impossible to take it further than that.
At the level of performance of the NR5100 and up we should not be seeing/hearing that kind of difference.