ALTO TS210 sounds muffled....then clears up

Last weekend I was creating a shootout video between the ALTO TS-210 and another wedge product for my guitar rig (Line 6 Helix). I've always been happy with the sound and clarity from the ALTO, but right in the middle of recording my clips, the entire unit sounded like a blanket was slowly draped over the speaker. After a few minutes, some "normal" tone returned. Now I'm reading about a common issue of a blown high-frequency driver. Is that one of the symptoms? I thought it was weird that some of the proper tone came back....please advise. Thanks.
2 people have
this problem