I was recently offered a used Infinity PS-10 in good condition for $50. Which is a fifth of the price I paid for the PS-10 I currently own. The only thing is though I don't know if it would make any difference, positive or otherwise. The room my HT is in is somewhat small about 12x10 and the only place I could really put it is on top of the one I already own. As it is I'm pretty happy with the Infinity PS-10 . It doesn't create chest rattling base like some larger subs but it does a decent job of filling the room with bass. Would it be worth having two.