Thanks, great descriptions. I doubt if I will upgrade but at least now I know what I am missing. I plan to build a KGSS amp for these. Your description has qued me into what the limitations are for the headphones, even with a great amp.

What is the difference between the old low bias Stax and the newer high bias Stax in sound? I have an old pair of Stax SR-X mark 3's. I am trying to get a feel for how the various Stax models differ.

Thanks Kevin, Lowering the volts will means more transformer choices become available. If I may, a final question. I am using the SRD-7 transformer on an old transistor dynaco amp. I am not satisfied with the sound. My reference systems is a Fisher 500C tube amp powering a set of...

Newbee question. Can I build a Gilmore Current-domain amp for the low bias Stax SR-X Mark 3? The 250 volt bias is easy. Can I use a +-250 volt power supply to keep within the 500 volt max swing? Would some of the component values need to be changed to accomidate the lower rail voltage? Thanks...