It sounds like I blew out one of the speakers in a Hartke 8x10 bass cab using their Ampeg B2R head at a rehearsal studio I use. It pops and buzzes on an F# but not other notes. I want to do the right thing and offer them a replacement speaker but the owner says it's hard to find a replacement for that type speaker. Question is what speaker goes in that cab? Are they 16 ohms? Another thing, If I use my Mesa WD800 head, It's loud and clear on every note with no buzzing. We are a loud band and I do push the amp. So maybe it's the Ampeg clipping and not the speaker. Thoughts?