Hi there, my T50rp is for sale.
I have used some dynamat and cotton on the inside, taped all vents but one, and put on some Hifiman pleather pads on them. Also recabled/balanced them with Canare Starquad L4E6S.
It was going to be a project to continually work on but funds do not allow me to do so, which is why they are for sale.
If you have to, I would imagine the mods are reversible except the recable as I decided to destroy the jack (I will have to do that no matter what as I wanted to balance them). Otherwise the dynamat can be peeled off and the tape/cotton can of course be disposed.