I think the problem with AVR running short of power while producing bass out of speakers is common in my case as well since I own Aviano 6 as well. With ODAC I did get improvement in sub-less mode in terms of bass and also with break in of the speakers or more usage the bass response even from AVR alone improves, noticed this in my system as well. What I will suggest to be the cheapest option would be to go the Aviano 6 shop with the same mp3 file that you are not getting fair bass response at home and ask them to play using a dedicated stereo amp with Aviano 6. If you see improvement as compared to your home, you know it is the AVR and not speakers, if not then it is definitely the file. Ask them to play a bassy song using CD Player and observe the difference. If still no improvement then Aviano 6 bass is not to your taste.
I think problem in mp3 formats songs.when I am playing movies at that time its good.so I cant do any thing with those mp3 songs.I am downloading 320kbps. I thought like amp may be give good quality.now I got AVR and amp will do same job for mp3.
Now I am buying audio CDs,If I go to CDp,is it fine ? my main source is laptop with HDMI.