I just shipped a GK 115LB cab to a guy. It's about 12 years old. He wrote back: "...One of the jacks gave me a problem first time I plugged into it and actually sounded like the speaker was trashed. Tried the other jack and no problem and was no problem when I went back to the other jack a second time. Noticeable buzz from the speaker which is primarily apparent with higher frequency tones especially at lower volumes but there's always some buzz coming from it whatever tone and volume. Is that normal for this cab? I've ran different basses, cords, preamps, and amps and it's a constant. It's not major and the tones are there regardless and is not distorting, just a buzz. In fact, it's even there (but to a lessor degree) with that cab volume off while playing through the other cab." And in a second message: "...buzz is a sympathetic buzz. I hooked up to the routine rig and I noticed the GK cab buzzed even though I was running through other cabs. Wierd though cuase it's not vibration in the cab, the buzz comes from the speaker." I had never noticed any buzzing come from the cabinet, but then the reason I was selling is because I haven't been using the cab for about a year, and somewhat sparingly for several years before that. Any ideas what the problem may be, or how we might figure out the problem, or how to remedy? TIA. And just re-reading my post here, I'm still trying to figure out what he meant by "sympathetic", that the speaker is vibrating/buzzing even when not hooked up?