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Headphoneus Supremus
I needed to change the cable on my Ultrasones. I took out the little circuit board in the left cup, assuming that it was just a connection point for the wire junctions. When I turned it over I found what I think are diodes. There are 2 for each channel, set up in series, between signal and ground. Basically they are in parallel with the driver. I measure 2.0 V drop through a pair (diode test on a Fluke meter) either direction. Any guess what they do?
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