Bumping. It was a lot of work, a lot of looking, a lot of phone calls and some disappoinment but I found a Hartke 1415 (15" speaker, 140 watts) at the Sam Ash in Clearwater, FL. Because there's some static when you bump or wiggle the input jack I got it for $209, shipped, as is. I got it yesterday and I am just blown away by the tone. I'm playing a $100 Squire P-bass through it and it sounds like I have active pickups. The thing just has so much punch. I love it.