I had duals but sold one already so this one is left, never pushed hard and kept in a non smoking envinronment. The Samson amp is a two channel (500x2) but the 1st channels RCA input does not work, the XLR input does so used it with a XLR to RCA adapter to run the subs in parrallel mode. I am throwing in an ART 351 EQ if the same person purchases both items. Email me if interested and want pics at email@example.com. I don't know if I still have the boxes, but could probably shipped at buyers expense.