Originally Posted by JensL
Excellent, good stuff!
Although...would've enjoyed some pics... ;-)
If you want to try out other resistors, it's just to add those instead?
Just incorporate a 120ohm resistor in series with each channel and solder them into a 6.3mm jack or into the adaptor socket: http://www.rock-grotto.co.uk/etymotic.htm
Basically you are just soldering a 120 ohm resistor in series with both the left channel and right channel.... ie: imagine the cable was chopped in half.... you would connect the resistors as shown in the pic.