To address the comfort issue with my Ed9s, I tried a couple of mods posted here in other threads.
The first was cutting a pair of 9 3/16" long chunks out of a computer power cable and stuffing them under the rims of the ear pads. This stands the pads up and keeps them from compressing when they are on your head. Trouble was the clamping force just stamped a hard ring around my ears. My ears did have room to live, but the cable dug into my head and the sound wasn't quite as good. I removed the cable, reserving the idea of maybe trying a smaller cable later.
Next, I tried bending the middle of the headband to relieve the clamping force. If you do this, be careful. I almost bent it too much. As it is the earcups no longer touch when at rest, but there is a LOT less pressure on my head now. Except... where's the bass?!?! Evidently the drivers need to be very close to your ears for the full effect of the Ed9 sound which is the reason for the extreme clamping force. With some adjusting I got the sound back minus a little bass, which was fine with me.
Now I have the cables back under the earpads and with less clamping pressure the stiffer cup rims don't hurt and they help with the seal which preserves more bass. I can recommend these mods if you're having the same comfort issues I did but be careful when you bend the headband and do it a little at a time until it's where you want it.
Thanks to (I think) thread
for the heads-up about the pad and headband mods. If someone else thought of them first, I humbly apologize.
Edit: oh, and to address the boominess issue, I'm finding out that these cans give me everything in a recording and some of the music I listen to has boomy bass in it. It's not the cans, it's the recording itself. Other songs have tight and impactful bass just the way I want it, but if there is boom in the music, I hear it, like it or not. I'm not saying that's the only reason the ED9s boom, but I have noticed it to be true. With the two mods mentioned above, I have a -2 on the Foobar EQ at 110 and 156 Hz and it's perfect for my ears. I hate boomy bass, so keep that in mind.
I have compared songs I think are boomy in the Ed9s with the Denons and they sound fine, but with a boomy fuzz to the bass once I know to listen for it. Then again, I may be taking placebo pills and they are working very well.