I have an onkyo tx-sr702 reciever and a bose speaker system (one of their acoustimass system with 6 sets of cubes and it was their biggest sub they offered. I got this about two years ago). This setup is the same as what they were demo'n in the store same reciever and speaker system. I dont feel I have it setup well. Not very happy with the sound while watching movies or while listening to music. Not sure what setting to play with or what sound fields. Hoping for a little help.
You are not happy with the sound quality? Were you happy with it before or were you unhappy with it for the past 2 years? The biggest sub they have is really not a sub...more like a mid-bass driver. Open it up and you'll see what's inside.
I am not very big Bose fan, I have used their products before and they just are not worth the money they ask for. They lack a lot of detail...and they never ever sound the way they do at the store...even then, they still lack detail.
What you may want to do is put the whole system on craigslist or ebay or some other place you can sell them off.
Im not the biggest bose fan but at the time the price was right and the area they are in is small and they fit it well. I did have them sounding better at one point but got a new reciever (same one under warranty) and havent been able to tune it.
As far as settings are concerned, you are limited only to what the Bose can provide. If none of them are getting up to par with your tastes, you have a decision to make...live with what you have or get rid of it and get something that will.
If you liked it before...what settings were they in? What was changed?
Honestly, no setting will make it sound the best they can. You cannot add more bass, because of the limitations of the midbass drivers, and you cannot increase the high frequencies, just because of the way the cubes are made.