I'll second the Rothell's. I use a balanced pair between my Atmasphere MP3 and M60's. (even with V2 removed and jumper-ed I still needed more attenuation with 117dB horns)
Now I can adjust the volume up to 11 -12 o'clock were before I was stuck in the 9 o'clock range.
Now I can adjust the volume up to 11 -12 o'clock were before I was stuck in the 9 o'clock range.