Thanks for the responses. This gives some hope for using the existing until better ones can be afforded.

@johnk: the sub is quite strange as the way its wired you'd think it was a passive sub being powered by the receiver; however, it does have its own power cord that gets plugged in and its own on/off + volume and phase switches. We had considered using a Y rca cable to hook it up but our biggest concern was that low 25w rating. If you don't think that's an issue we might just have to give it a whirl (his fav movies are action w/ lots of explosions)