I loaned a friend my home built 2x10 cabinet recently. He was using it as a standalone speaker cab with his GK 700 RB IV. He called me today to tell me it stopped working, he said it was working fine, he stopped playing for a minute and when he started playing again there was no sound. It is a sealed 2x10 cabinet with 4ohm speakers in it wired in series with a simple input I salvaged off an old Behringer cabinet. Nothing fancy, no horn no other wiring. So anyway I'm thinking one of the speakers must have blown, in my experience blown speakers still make some sound. However if one speaker for whatever reason had a bad connection then the other wouldn't work either. Also he said he checked the head with another cab and it works fine. What do you think?