the signal i got was a slight audio signal. after looking inside noticed that the right cup main speaker wires were the copper wire and the blue enameled wire, the green and red enameled wires were hooked up to a small senor, my guess is it has something to do with the sound canceling. i must say that when i got the slight audio signal i just had the two wires hooked up the to audio jack, the black and blue, no common ground was hooked up which i thought was really weird, since it was so quit it was hard to hear that they were coming from both speakers, but it seemed like it was only coming from one,if you haven't noticed, i only have a very basic knowledge of electronics, if i cant figure this out and get them to work i want to do a bluetooth conversion similar to yours @vantt1. i picked up a few things today in order to accomplish this.
i got a smaller bluetooth transmitter, but this one requires 2 AAA batteries. I'm hoping to use the circuit board from this one as it is half the size of the last one.
I'm hoping that you could guide me through the process. i was able to completely dissemble the studios yesterday, and i must say i was very difficult as you mentioned because on the red rubber tabs. taking it apart was simple. putting them back in was a pain. I'm going to mess with it a little more when i get home hoping i can at least get the damn things to work! wish me luck!