[morph2k4]

Hello all, I was sifting through the sr-60 mod project thread thats been bobbling around.  On page 17, someone mentioned they did a "6 hole mod" that drastically improved the bass.  I saw a DIY page with a whole bunch of Grado mods, but I didn't see anything there.  I think maybe the mod is the addition of some holes to the damping mod (just pasting some felt around the back of the driver.  Does anyone have a good reference for this mod?  I just found my sr-80s and since I don't use them any more, they seemed like a fun project.  Thanks in advance