Both are very well balanced, meaning without any eq across all my rigs they sound great with all types of music. Nothing is over pronounced, but they are still very dynamic in that if the recording has some good bass you get it. Vocals are extremely detailed and my tube amp couples nicely with either of them giving a very warm midrange that really lets you hear the emotion in the singers voice. No sibilance. You can however easily hear the defects in a poor recording, so nothing is being covered up here.
The differences are pretty mild believe it or not. Aside from one being closed and super efficient (driven easily from an iPod) and the other open and much tougher to drive they share a similar sound signature. The closed seem to have a bit more mid bass and lack some of the clarity of the open. Also the head feel is completely different of course. The open are much more comfortable for long listening with the velour pads but the closed does a great job blocking out the outside world. I'd say they each have their place and were designed appropriately for their intended environment. I use the closed at work so no one can hear the music and i cannot hear them and the open at home with a Paradigm MilleniaOne CT playing in the background to get the intimate details of the headphones while still experiencing a bit of chest thump from the sub.
I have played around with the EQ on both and never found a setting better then flat.
My only complaint would be the adjustment of the headband is a bit loose. I am a bit OCD about the sides being set the same and prefer to never change the headband adjustment and sometimes these slip out of their settings. It would be great to have a little set screw in the inside where you could lock them into position. One other nitpick I guess is the cabling could be a bit lighter and less stiff on the T1s and it would be even better if they entered on only one side.
Forgot to mention the soundstage. Every instrument has its proper position. Very wide and open even on the closed. The open is even wider and more open ;)
Edited by groovyd - 8/19/13 at 6:04am