Thanks, I ended up going with a diy cmoy with parts from Digi-Key. The amp exceeded my expectations. The resolution of volume control is much better. I used a logarithmic potentiometer if anyone else is curious.

Good deal, thanks for the clarification. If I can find some time I'll try my hand at a CMoy and post results. 

I'm a novice to hi-fidelity headphones, but not to DIY'ing. I recently acquired some T50-RP's that I find too loud even on the lowest volume setting. I usually listen away from my computer, using a Galaxy S3 as a player.    Has anyone built an amp (or other device) for the purpose of allowing...

Possibly interested, I've seen a couple of pairs of ATH-M50 and Grado around town already. Local in the NC Florida area.    Equipment is: -Fostex T50RP -Sony MDR-V500