I have one of the best made - it's a polk psw 650 paid 700 new - less than 5 hours of music played on it = 350 + shipping do a goolge search for reviews on this item - 330-219-8020
bought this new for the conference room at our office but it was to much for here at the office like new condition with less than 5 hours playing time original msrp over $700 asking $ 350 + shipping this is a top of the line powered subwoofer in as new condtion if you are not sure...