For those who know Chinese, I've got a long post detailing everything for you: http://www.erji.net/forum.php?mod=viewthread&tid=2251633

Bought another T1.1, No. 45XX The theory is mostly true. Less serial number, better the sound quality

I believe making a series full of variations is silly for a company and it is confusing the customers.

Thanks for your info! Due to the shortage on the used market, I haven't seen a T1.1 under serial number 10,000 for a long time, maybe I can never get the chance to take it a listen....

Recently bought a pair of T1 1st Gen in a serial number of 18xxx However, I've heard from some rumors that there has been a theory on the 1st Gen Beyerdynamic T1s It looks like this: No.1000-3000 The first edition of T1 1st Gen, the best, the most natural sound, the most great headphones...

???

There are three levels of output impedance on this hifi m8 , but some of my friends says from the bottom， left to right the impedance is 11Ω 2Ω and 1Ω,  which means the highest impedance is on the left side?? is that right??

my work just got paid and i'd like to buy a new system for rock, symphony and jazz

x10

its useless for se215,a cable of 215 doesn't cost much

now i m using colorfly c3 and tf15, feeling good. i just wanna buy a new mp3 to play with x10 and tf15 .so what about fiio x3? i m a rock lover.