I have an atypical entertainment room. It is 20 feet long by 8 feet wide. I have a PSB's bookshelves, center and rear bi polars. It is a good sounding system driven by an Onkyo 9.1 receiver. My problem, if it is a problem seems to be that either I am used to hearing the rear surround speakers (so I can't actually relaize if they are working properly) or they are not calibrated correctly. The rears are 6 inches from the corner on the back walls at a height of 7 feet from the floor. My listening post is about 6 feet from the back wall. I can hear sound when I actually try to listen, but for the most part, I can't differentiate if they are working or not. When I use the receivers speakers white noise sound testing they are coming in loud and clear. Does that mean I am just used to the 5.1 or the sytem does need to be calibrated?