Rezanazari, haven't heard from you yet on the first post, are you using your home theater's sub when listening to music? My AVR has settings that will only use the front speakers if I want, I think it is called "standard" or something. I typically use one of the home theater surround settings for two channel music in my HT, I forget which one, but the processing fakes 5.1 out of a 2 channel signal.
Signal processing makes a huge difference when playing two channel on an AVR in a home theater. I had to tweak and tweak and TWEAK to get my Denon AVR to sound as good as a 20 year old Yamaha receiver in 2 channel (front speakers only).
