BillsonChang007
Headphoneus Supremus
And yes the K550 does sound very open! {i'm selling one my self} and the isolation is wonderful, in addition I'm selling my old K550 and JDS Labs C5 combo, the c5 added a nice mid and bass presenace into the K550. For me the K550 had a great TIGHT bass, it was awesome for rock, folk, jazz and classical, but for EDM I still wanted a touch more bass, which is where the C5 comes into play, I choose the C5 because of it was able to retain mid and treble details even with the bass boost on, not to mention it has a touch more sound stage than the Fiio Amps
Still, the Dt 990 and E11 combo is an excellent one, that I used for a while my self! although rember there is no isolation with open cans [which might be a good or bad thing for you]
+1
Billson
![Headphone Smile :) :)](https://cdn.head-fi.org/e/headfi/smily_headphones1.gif)