I have an older Denon 5.1 receiver and a Polk 12" powered sub at home that shakes the whole house when watching action movies. I used to have all Polk speakers in the old house including rear in-wall surrounds but when we moved to this house, the previous owner left his 5 speaker Bose Acoustimass (sp) system and crappy sub. My wife will not let me set up the Polk speakers as she likes the stealth look of the Bose and to her ears, sounds just fine. So I have a Polk center channel and pair of front speakers just sitting in boxes in my closet.

I have a "high end" ELS 5.1 system in my Acura and have not done anything with it. It sounds okay but needs a lot more volume and a proper sub. I guess I just don't spend enough time in my car to warrant upgrading (I have an 8 minute commute).

Al