difficult lah to get this superlux headphone...
looking to buy 668b and 681, but none of the seller got stock....or response from the seller themselves not that encouraging...
....very frustrating..

recently got my 681....first impression, the high is quite harsh...lot of hiss hiss...bass seem good enuff for my cheapo ears though...
any mod to address the high issues? in-line filter or some sort..
the mod shown in the link is quite advance for me.
http://www.rock-grotto.co.uk/HD681.pdf
Unless somebody here is providing that service here..

bought myself a 681. Which portable model will be the best? but i dont like iem. Planning to get next month...

driving 681 with e7/e9 combo...listen to metallica s&m....the high is just too harsh...just not suitable for that kind of music?

anybody here provide service to mod 681. Want to modify to have external cable connector like 668b..