[Ray Dahr]

Thanks for the suggestions.

The boards in these speakers look as new, no discoloration, no deterioration.

By swapping boards with my good speaker I have determined that the problem is not with the board that has the switch on it.

[Ray Dahr]

Thank you for your reply. My speaker has the white foam, there is no visible deterioration of foam or boards.

There is no problem switching it on. Quite the opposite, the problem is that it constantly switches itself on while in standby, with or without an audio signal, with or without an audio cable plugged in. It makes an annoying hum after it switches itself on.

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