this is FREE, and impressive !!!
take that sucka and put it right behind your chair, i mean, pretty much touching it.
i have one. bought it before i got bit by the A/V madness. i could never find a place in my room that was any more than "ok". i then built my diy subs, and they are impressive. then, i thought about getting a BUTTKICKER. while thinkin about it, i said to myself "hmmmm, i have this sub120. i wonder what it would do as a makeshift buttkicker right behind my chair ? just to get an idea"
it works great ! and its not even turned up much.
so, i say, at least try it. of course ymmv. for me, it was a no brainer.