When you played it later, are all the drivers producing a sound? If so, my guess is that the wiring inside just knocked against something else internally. Sometimes when I pick up my m22's and move them or carry them somewhere, I can sometimes hear a rattling sound.

You could also remove some of the front drivers and look inside to make sure all the wires are still hooked up. However, if they were not, one of the speakers would not be working.


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