The bass is as strong as the DT770 for sure. It has a big hearted sound. To me - similar to large speakers. It reminds me of the way that the Senn CX300/400's are described as 'bass led'. These are bass led but are a great match for Ipods and the like since they are quite sensitive. They go really very low for a cheapish headphone. Bass lines are very easy to follow in quite complex mixes.
Extension into the treble is also good. It's not a toppy sound at all but there is the old CAL sparkle up there. To me, they sound like a grown up version of the original CAL. They are better for sure. There is a lot of detail in the top but the bass is big and so you get the impression at first that it isn't detailed. in fact, it does reveal some subtle stuff as well. I was listening to Transatlantic today and not only does the CAL2 give this big, warm sound that really communicates well but it also showed that on some of the tracks, instruments had been recorded in a different room and was easily detected on them.
I'd say that it is a very much 'bass led' headphone with a treble sparkle in the top. no harshness whatsoever. It's also very pleasant when played loud because of this.
Although I don't like the red version (colour), I have become quite attached to its really individual sound since it does sound like a full sized floor speaker!
This cable is ideal and better than the one that comes with it by a long way:
It's available in different lengths and doesn't play up on a stereo out from the amp as the supplied lead does. The lead that comes with it is designed for Ipods and phones. No good with a stereo out since the plug has three sections, not two which is a pain.
I'd say that it sounds like something more expensive. I kept away from the modding thread on this headphone since it's too new to start pulling it about. However, if I were to modify it, I would consider lowering the bass quantity in order to make it 'flatter' sounding. I have a passive filter that actually does this if I want to but I enjoy its full bodied sound if I'm honest.
I'm considering that cable! Looks really nice. Is it an official Sennheiser cable?
But what about the headphone end when you need to convert it from 3.5 to 2.5mm? Any recomendations on quality converters that won't affect sound quality too much?
EDIT: Nevermind, apparently it already ships with adapters/converters.
Edited by Quaresma - 12/17/13 at 1:10pm