Finished second cup yesterday, but couldn't get gel pads on it at all. Tried using pliers, with limited success, but still wasn't able to pull them on. Will just tape them on today and stuff some cotton under pads to stretch the tape a bit so they won't be loose. Well, I guess that is the only way to have stuffing under the gel pads to lift them - their lips are so short they won't hold if you put anything under them.
Tried the mod with stock pads though. One cup had paxmate on ear side, other didn't - removed it while trying to get gel pads on.
Sound has changed indeed, but not really sure how. Some more detail, somewhat too much bass. Paxmated cup seemed to have much more extended highs - probably due to a bit lifted pads - but quantitatively there wasn't much of them.
Ran some FR tests - 16kHz is heard well, 17 is barely noticeable, but my ears aren't good. On lower side, 33 Hz rumble is heard very well, 25 Hz is okay, 22 is hard to hear. Again, without real pads it's somewhat pointless.
On strange side - sensitivity hasn't really changed, seems to be nearly the same.
Mod is as follows:
Plasticine on the inside of baffles
Plasticine around the driver and on it - sealing any possible leaks.
Plasticine in the outer rim of the baffle.
Plasticine seal between cup and baffle after closing them.
Stock white felt intact.
Baffle vent open and unrestricted.
Fiber scrubber square over the driver for dispersion.
Random cardboard thingy over central column - for disperson as well, doubt it makes much though.
Central column filled with plasticine so no leak from there.
Deeper areas of the cup lined with dynamat.
Entire cup (sans outer rim) lined with paxmate.
Random paxmate cubes all around over 1st layer of paxmate.
2 bass ports covered with paxmate.
Paxmate over contact pad.
Paxmate 'walls' over driver's lower angle, about half of driver's length each - attempt to make a 'labyrinth' so no sound would leak directly from driver to bass ports and would instead travel along whole cup.
3 bass ports closed from outside with tape. No felt on ports, only dust cover like one in front of driver. (I have a T20RP-mk2).
On the ear side:
Black felt removed.
Bass lens leaving open only the center square of the driver, made of thin self-adhesive dense felt.
Dynamat around the driver - about the size of the former black felt area, with hole for baffle vent.
Paxmate over dynamat, about the size of the opening in earpad - subject to change.
Beyer gel earpads, held by duct tape, with cotton/paxmate lifters and probably paxmate layer on the inside of the pad - also not yet implemented.
In the end, I have a question: does anyone have/know a good program or just sound file for sweep tone test, preferably incorporating equal loudness contours?