Yeah, I dig fifteens. I'm using two 3015s now and am boosting the lows and cutting mids and highs. Should I replace one of them with a 3015LF? I realize I'd then need to find or build a cab for it too. Do I need to crossover or can I run it full range? I'm not a hi-fi guy. The mids and highs on the 3015 are good enough for me. Anyone doing this?