I'm building out a new rec room above my garage. I'm using an Onkyo TX-SR606 that I have sitting around to power the 7 in wall speakers as well as the 2 outside speakers. My current dilemma is that I will have to build an enclosure in to the wall with a power outlet in order to run a powered home theater sub but I'd rather run an in wall passive sub. I'm trying to figure out if it's cost worthy to pick up an amp off of craigslist to power the subwoofer.
I need opinions on whether or not I should just bite the bullet and build the wall enclosure for a standard home theater sub or if someone can fill in the blank on what I need to purchase in order to run this sub.