I have 1 XV15 and a Jamo Sub 7 THX Ultra. The Jamo is sealed. Sounds really good. I don't listen to stuff that loud. I was watching transformers dark of the moon last night at -25. I have the Jamo in the rear right corner,sounds really good there. I had the XV15 up front between the tv and left speaker,the output was lacking. I moved it last night to the left rear corner,much better,but do I want both subs behind me in the corners? There is about 6' behind me,so they aren't right behind my couch.