I agree with Zd too. Sadly, the 2 channel preamp sections in most AVR's are an afterthought - they were designed for multi channel use with their room correction facilities. Not stereo music. I have yet to hear an AVR in "pure direct" mode that I was impressed with.
Consider a separate 2 channel preamp with a Home Theater Bypass feature. This will allow seamless integration with an AVR and your power amp all in one system. I use a Parasound 2100 preamp in my configuration. Relatively inexpensive and brings my 2 channel listening up to a whole new level. There are many manufacturers offereing HT Bypass preamps all the way up to five figures. If you can fit another box in your installation, check them out. Could be the solution to your problem.
Consider a separate 2 channel preamp with a Home Theater Bypass feature. This will allow seamless integration with an AVR and your power amp all in one system. I use a Parasound 2100 preamp in my configuration. Relatively inexpensive and brings my 2 channel listening up to a whole new level. There are many manufacturers offereing HT Bypass preamps all the way up to five figures. If you can fit another box in your installation, check them out. Could be the solution to your problem.