This is the circuit http://imgur.com/BB3l0   This is what I did to bypass the resistors http://imgur.com/vtUHR&Ie0NN   Showing in the drawings is just the Left Driver circuit, where the main cable "lands" as this is a left sided headphone, note that the right driver wires are just...

I copy/paste some jpg drawings but are not showing up

Quick drawing from memory         then I cut the trace where marked and removed the cable to bypass the 1.3 resistor

I have the MA900, They are Awesome after I took out the resistors SONY put in there to compensate for high output impedance sources, Bass is tight and extended and very strong for a open headphone, plus the open design keeps my ears cool, the framing is magnesium and very strong but it looks...

   Hi guys, Long time lurker, I bought a sony ma900 a few weeks ago looking for the most comfortable open design (My ears get hot really easy), tried the HD650 but didn't like the build quality and the comfort at all, So I got the MA900, at first it sounded so thin and "weak", like an AM radio...