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I have the Promedia 2.1 (the one with the power switch and transformer) system for my PC. I have had for some time now. My absolute favorite speaker. I had a couple of issues in the past that I repaired like Din plug and scratchy volume. Several months ago, I was listening to some music at a high volume. After 45 minutes, I noticed that only one speaker was working and could not hear the sub. I checked the speakers and they were fine. Opened up the sub and found a blown fuse on the HF amp. Now HF speakers work fine but the sub is very low in volume even though the adjustment on the pod is all the way up. I checked the sub and it is not blown. Measures good and tested with another audio source. Connected another sub in place and still had low volume. When I looked at the LF amp, I could see that the board was very discolored due to heat. I removed the board and found R16 and R17 to be loose. I then cleaned up the solder pads and reinstalled the resistors. I checked the fets and they seemed to be ok. I checked all the other parts for bad joints. Didn't notice any components to be damaged. I was wondering if there was a service manual for the original Promedia 2.1 (the one with the power switch and transformer)? Does anyone know why the audio would be very low? Thanks boB