I was going to try this mod. I turned the driver so that holes are aligned. That alone didn't change the sound that drastically but the little it changed, I liked. Instead of going with the pad thing and coin mod (I like expansive soundstage) I tried something else. I completely removed the bottom part of acoustic lens. Now holes are open and center of the driver is completely exposed. It's risky but worth it. Results were terrific. Sound is bit more clear now. Nature of the headphones did not change it just sound more refined. Biggest improvement was in details. Jvc's are now ridiculously detailed. Detail of analytical headphone with fun jvc sound. Before this mod I enjoyed jvc's best with loud volumes but now these are amazing for low volume listening too.
I don't understand what jvc tried to do with that acoustic lens thingy. It did make headphones sound more speaker like in sense that in general headphones have better detail then speakers and acoustic lens effectively hids the detailing potential of dx1000. If the goal was to mix frequences it has no (positive) effect. It would make sense if headphones had different drivers for bass and highs but with one driver whole range is nicely blended even though distance sound travels to ear is only so short.
If someone want's to try this mod, it's really easy. Lens just pops of and can be put back on as easily. No screws, glue or parts that wear out.
I'm so happy with my dx1000 now that I sold my T1 and w1000x. Took me couple of weeks to make myself do that. I really liked t1 and w1000x but I just didn't want to listen to them anymore after modding dx1000.