During a gig a few nights ago I had an Acme cab make a weird buzz. At first I thought it was something vibrating as the buzz was most prominent on certain frequencies (Eb was a killer). During the second or third tune, the buzz became progressively louder and the cab completely stopped working. I have never had the experience of blowing speakers before, so I don't know if this is it. The drivers have some wear, but as far as I can tell, there are no tears or holes. Since then the cab has not worked at all- it produces no sound whatsoever. I am fairly positive it is the cab, as my Schroeder is fine through the same setup, and my other Acme cab works, although it is making a similar buzz, which makes me wonder. I don't know if it is a coincidence or if my poweramp damaged the cabs in some fashion or another simultaneously.