New YHD-3's showed up so I made the YHD-30i's like
@Philimon. They sound good, but for some reason I thought subbass was better with his pair. Now these are just better KPH-30i's, they don't really have the amazing subbass like my YHD-550's. Honestly, I've gotten used to the recessed mids on my YHD-550's, don't even care anymore. I listened to them for almost the entire day the other day with flat EQ and they were flawless.
Still waiting for the glue to dry on YHD-30i's but they are useable right now, haha. They sound good. Interesting airiness. Not much subbass, but I recently bought a Subpac M2x and this sort of replaces the bass of your headphones, so not really even that noticeable for me right now.
I wanted to see if sealing the Grado pads on KPH-30i frame with blue tac would help bass extension.
No real appreciable change. I will be using blue tac to secure the pads in place however, I hate how they shift around. Blue tac solves this problem just be sure to apply at the edge of KPH-30i frame or just offset from driver a little so it doesn't show up around the driver through pad opening.
-edit-
With the Subpac, these just absolutely smash stock YH-1's. Everything above like 60Hz is good... No damping, just glued the drivers in place and closed everything up, ez-pz.