Thanks Purrin for the idea on the mod.
I try it on my LCD2.... result are kind of different. I use a piece of tissue, fold 2 times and cut it into shape and stuff in. This effect is kind of of blocking the opening of the driver, make it closer to a closed can headphone. Made my lcd2 sound darker, extreme high freqs are tame some what, mids are thicker, base has more extension, clearer mid bass, sound quieter as it close up the driver opening so kind of blocking noice from outside. I like it especially on slow rock, rock music.
I also try it without any cover, naked, you will see the connection to the + and -... take note do not screw back the metal plate back without the black felt, I suspect it may short circuit the + and - contact. Stage improved but overall sound thinner, good for thick sounding system. Of course you will have to find a way to cover up the + and - contact to prevent short circuit without the black felt.
I like electrostats but to build a proper amplifier for them implies complicated designs almost invariably based on silicon and I prefer tube amps. I can drive my orthos with my speaker amplifier and this gives all the current they need.
IMHO the felts on the grills really destroy the LCD2 (my one is R2). They have to be open to play similar to electrostats. Also I think their HF extension is very bad in stock. My latest solution is half the size of the driver of microprous tape on top of the driver felt plus two small squares of same tape stacked over the middle of this. Then I placed 100% wool felt on top of this (the tape is in the middle of the two felts sandwich). I think the microporous tape has the same role as the TP but I tend to think it is a better alternative.
Then I used thick fish tank filter to fill the cups (practically doesn't reduce volume, doesn't block the back waves but remove resonances).
This solution brought the HFs out without penalizing LFs but mids were slightly less detailed. To improve this I made small holes on the tape all around the middle triple layer of paper.
So far (two days) the LCD2 are responding very good with all kind of music I listen to (anything but hip-hop, reggae, house and the like).
Edited by Antistase - 12/10/11 at 11:00am