I currently only use my senn600's with the Toshiba CD_ROM on my computer and it sounds great! I have heard the best and I am just completely happy with this for now.

Here is the famous dissection of the Grado RA-1:

image 1 - full circuit board
image 2 - damage to the mahogany
image 3 - schematic with values *updated*
image 4 - volume pot
image 5 - proper schematic (courtesy of Thomas of TO)

My mods to the senn600 - mods to the hp cable.

Yanni - This guy just rules so I've given him a page on my site.