Don't add a second sub unless you have a VERY LARGE Room. It will make the Low End worse. Some tend to think otherwise and they regret it. I used to be a Forum regular on Sound and Visions Forum, but grew tired of the cookie cutter replies, brand bias instead of research, etc.
You're in Michigan I believe, if you want the biggest bang for the buck subwoofer money can buy, look no further than these guys:
http://www.svsound.com/products.cfm If you email them with ANY QUESTION, they reply. The OWNERS are the ones replying, not some other employee. These are bar none the best subs for your HT that money can buy. Quality is equal to REL, Price is right, they don't use cheap components and their customer service has already made waves as did Outlaw Audio.
