After a few days with both my sets of 900's, I don't think the mod changed anything but the bass. It's indeed tighter and I find Lawtons earcups to be more comfortable and I get a better fit as well. My ears use to touch the inside of the pad but lawtons pads fit perfect. I don't think I could change out the earcups as I really love the stock 900 cups but to anyone that does, all the power to them!
The mod IMO didn't make any drastic changes, just cleaned up the bass at higher volumes. i can now play dub or any bass heavy music at the same level as before without any issues at all.
That's what Oregonian basically said. The change from stock to D7000 with Lawton mods was much greater than the change he heard for the Fostex 900, since it is such a great starting point. The tighter bass seems to be the main difference you are hearing. Thank you for the observations, there are few on here other than you with the ability to try them both!
Personally, if my fostex didn't have the mod, I wouldn't have gotten it done, but since I was able to get one with the dampening already done, I figured it's just an extra perk.
Edited by TWerk - 6/24/14 at 10:33pm