Will the Beyerdynamic DT770 Pro's get better sounding as they burn in?

Most break-in happens within minutes to hours of operation so if you already used them to a maximum of maybe 12 hours, they're pretty much where they're going to be at for the rest of their lifetime.

Quote:

Originally Posted by mpetrera 
Hey guys just got the 80 ohm version, I have never had professional-level sound before so i think they sound great. One thing I'm wondering about, however, is the sibilance. It seems kinda harsh, like it needs to loosen up on those high range noises. Will they get better sounding over time? 

Are you using a headphone amplifier with them?

They really do not sound their best unless used with a headphone amplifier.
 

Its been a while since I heard my 770s .. AFAIK I do not recall any sibilance.  Speaking of sibilance .. you should try Sony MDR-V6s or 7506s .. those have loads of sibilance.

Quote:

Originally Posted by mpetrera 

Hey guys just got the 80 ohm version, I have never had professional-level sound before so i think they sound great. One thing I'm wondering about, however, is the sibilance. It seems kinda harsh, like it needs to loosen up on those high range noises. Will they get better sounding over time? 

I have the 250 Ohm version, but the only obvious change I noticed over time is the bass getting less heavy, and maybe the upper midrange being somewhat less recessed. Other than psychologically getting used to the sound signature, in my opinion both of these changes are down to the seal becoming worse because of looser clamping force and the deterioration of ear pads from wear. A similar effect has been reported by others as well, when old worn ear pads are replaced by new ones, the bloated bass returns immediately. Driver "burn-in" has minor (< 1dB) effects at most. Maybe the treble was slightly veiled and grainy for a period of time, but that could very well have been just a psychological effect. In any case, after a few months the highs are just as sharp as out of the box. So do not expect it do become smoother, if anything, the sound will be even brighter overall because of the loss of bass, just maybe clearer and less boomy/muffled. Amplifiers will not fundamentally change the sound either (unless you get one that has a deliberately colored frequency response), their effect on the sound quality, especially of high impedance headphones, is rather overrated on this forum.

To summarize: if you want to keep the DT770, and do not like the amount of treble, you will probably have to equalize, or modify the headphone (e.g. add DT880 style treble filtering disks like those seen here).

http://www.innerfidelity.com/content/measurement-and-audibility-headphone-break

- the short answer quoted from his article... "This idea that you simply must let headphones break-in before you know what they are going to sound like is a myth. And this data busts it."

It's just sibilant plain and simple

what are you powering them with?

as already mentioned the 770/80 is a very different sounding headphone amped vs unamped in my experience.

and really the 770 pro 80s aren't that sibilent of a headphone.

you should hear the 990 or sony's mentioned above, or some grados

i think you might just be experiencing non rolled off highs or they are revealing poorly mastered material.