Thanks TiEx for these tips. I'm driving the TDS-7 with my KingRex speaker amp which I believe is just fine with the 8 ohm load.
I have seen those open pack mod picks in some Russian forum but I don't want to go that far. I'm not willing to cut any holes to the structure.
I will definitely try to remove that wool from the drivers. What about the round opening in front of the drivers? Would it be better to expose the whole driver?
Edit: Don't open the drivers on these if you are not 100% confident about what you are doing. There are some nasty loose magnets that brake the membrane more than easily. I bricked mine :D Unfortunately I can't comment how removing the wool affects the sound :D
Please let me know if somebody has spare membrane for TDS-7. I can also sell these to someone as spare parts. The other membrane is still fine.
To bad to hear this. Yes it is a tricky procedure of disassembling the TDS-7 driver. You must be 110% careful and glueing the magnets to the body of driver is needed for easy assembling. Exposure of driver in front of ear must cover all four driver openings. I mean those openings must have free way to the ear, with some very light damping. I've heard many stories of bad luck with TDS-7 mods. Some guys tear up the membrane or conductive layer. Some brake the magnets or body. You definetely need some skills here. I think I'l get my self to pairs prior to start modding. This way I will have all spare parts.