I have 2.5 cubic foot box with a 3.5" port about 6 inches long, with a Delta Light 2512 in it. I did a pickup gig with an extremely loud band and used it on one side of an Eden WT500. Had another cab on the other side. Both boxes are 8 ohm The amp rates [email protected] in stereo mode, so that's what the box should have been getting max. The master was dimed, pre at 1/3, bass eq flat, bump on 2 mids, treb flat. I wasn't not that bassy, just loud. Passive jazz mostly on bridge. Now the 2512 buzzes like all heck. I tried 2 other amps. Buzzes with them. Eden sounds clean with other cabs on both channels. When in say buzzes, I mean it distorts and fuzzes. What are the chances I screwed it, I was well under its rms rating, in a proper sized box. It's performed well in the past with other amps in other band situations, maybe not so loud though. I will check for rattle from hardware, but it sounds like it's cooked.