Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

I am hopefully getting to the end of fixing up this Polysix, having installed the Kiwisix upgrade kit and power supply board, and have recently completed the various fine tuning and trim adjustments.

But one thing that I cant seem to figure out is why the headphone output is so high.

If I use the main audio output jack and set output switch to High, and Volume knob to 10, I then set my monitor amp/mixer to a comfortable listening level, and the output from the Polysix sounds fine and there is no noise, or it is below audible level of the .

However if I plug in my headphones to the headphone output jack, I have to make sure the volume knob is way down to about 1 or 2, as any louder and listening through the phones is way too loud. If I am careful not to play a note I can turn up the Volume knob to 10 and then I can clearly hear the noise floor on the headphone output, but I am wondering if anyone could explain why the volume level for the main audio output is fine at Volume knob setting of 10 but way too loud for the headphone output.

I tried searching for any info on this but the only threads seem to be related to noisy outputs which is not really the case here but rather a too high headphone amp output. I followed the instructions for adjusting the trim pots in the service manual and the headphone amp offset is at 0mV and level is 0.3V peak to peak and those are set correctly

Once again thanks in advance for any help with this. Cheers.