I have one 25-31CS+ for sale just over 6 months old. Perfect condition with original box, manual and port plug. It has never been bottomed out: used with THX Peak limiter system. I also have a Soundstream DA-1 amp (350wpc @ 4ohms) for sale as well (Original Retail $1200). I will take $450 plus shipping for the sub and $450 shipped for the amp.