Dirty means "sloppy"...aka not tight. IMO, alot depends on the enclosure and amp you're using with it though. I've heard Audiobahn setups that sound like shit and I've heard some that would blow your mind. Usually you get what you pay for, but I think Audiobahn's higher end stuff is hard to beat for the dollar. Ofcourse, if you're an SQ fanatic, Audiobahn isn't a contendar...and I don't think it was ever meant to be.