I recently had some maintenance done to the head of my 1966 Ampeg B-18N Port-a-Flex, that has its original Cleveland speaker; the amp was working but making static, and before there was no distortion from the speaker - at least that I was aware of; I only took the head to his shop. I can find the tech's notes and post them if it turns out that they are important. When I got the head back and plugged it in, it sounds like the speaker is blown because while the sound is powerful, its also very distorted, like an overdrive. I moved my 1970s B-15N next to the B-18 and plug it into the B-18 speaker, and get the exact same distortion. 1. I plug the B-18 head into the B-18 cabinet and its a distorted tone. 2. I plug the B-15 head into the B-18 cabinet and its a distorted tone. 3. I plug the B-18 head into the B-15 cabinet and its a clean tone. 4. I plug the B-15 head into the B-15 cabinet and its clean tone. Here are photos of the cabinet: the full front view without the grill; a close-up of the cone; and the two interior connections. Does it seem like the speaker is blown? Or could it be related to the recent repair?