Originally posted by charlesaudio
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I think the MUTE control line has a delay to it, starting off at 0V, and charges up to a negative voltage, since cap C5 is being charged by R14. The negative voltage on that mute line would unmute the FET's after the voltage charges up.
If that is so, the Thermal Switch is a COR format. If it's COR, you could manually short it and check if the turn on/off thump still occurs. Of course, all this assumes the Muting FET Q19 works. Likewise with the Muting FET following U3A on the crossover amp.
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