I recent scored an old 70's Ampeg B25 2x15 cabinet on the cheap. It sounds good for the most part but the speakers sound like they are on their last legs. They occasionally fart on the mids. Right now I'm running that and an SVT810 off my SVT-4PRO. The 8x10 I run full range or dedicated to highs and the 2x15 I use solely for the low end. I'm looking for speakers that can get nasty, boomy lows at a really high volume. I need some recommendations, all the searches here are about replacing 10's Also, it's not necessary but I'm thinking about replacing the stock 1/4" jack with a speakon, thoughts?