I currently have two Polk 505's but I was considering getting two more, but then I thought, why not get four more and stack them for a total of six subs. But then I thought wouldn't it better to have on quality sub? So what's more awesome six used subs ($700ish used) or a new SVS SB 16 Ultra ($2000)? \n\nIs it really overkill to put six 12 inch subs in a 4x8 listening area?\n\nThis is not for a home theater. This is a video of my current set up.