I have a Dell Optiplex GX which I got used. After scratching my head wondering why there wasn't any sound, I poked my head into the computer & found that there wasn't any speaker. There was, however, a port that looked like this on the motherboard:
Four little wires sticking up, labelled EXT SPKR. So I went and got a speaker, then made the unpleasant discovery that the connector looked like this:
Two connectors, not four! However, they were spaced the same as the ones on the circuit board. I fiddled around, but couldn't get the sound to work no matter how hard I tried.
I have since surmised that the connector on the motherboard is an "analog audio" connector similar to that on the back of a CD player. If this is the case, then the connectors should be arranged like this:
. . . .
R GND L
Anyone have any ideas on how to connect the speaker?