waynes world said:

   
I haven't seen any bad impressions yet! If you have a link or two, that would be appreciated. 

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Well, these guys are saying it is same driver as Dt1350 and just a consumer variant as opposed to 'pro' market:
http://www.head-fi.org/t/660347/beyerdynamic-tesla-appreciation-society/195
 
But Beagle says they are a big improvement including SQ:
http://www.head-fi.org/t/669824/upcoming-beyerdynamic-headphones-custom-one-tesla-custom-one-studio-t51p-and-amp-a20/135
 
What Hifi gave them a 100% / 5star review saying best in class
http://www.whathifi.com/review/beyerdynamic-t51p
 
To me, even if they sound exactly the same (or even a touch warmer), if the comfort is such that they cause no pain and can be worn for hours, I'd happily trade my Dt1350 for them

I've already made an investment in my DT1350s, both the purchasing and upgrading of cables.  If the T51p is just a repackaging of the same driver, then I just can't see there being a grand improvement....

buttuglyjeff said:

  I've already made an investment in my DT1350s, both the purchasing and upgrading of cables.  If the T51p is just a repackaging of the same driver, then I just can't see there being a grand improvement....

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The T51p driver is not the same as T50p according to Beyerdynamic's media releases.

Yeah, but I thought I read in one of those threads they were saying it was same as dt1350 driver. I think I misread though. Should be a new driver

designbykai said:

Yeah, but I thought I read in one of those threads they were saying it was same as dt1350 driver. I think I misread though. Should be a new driver

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I also read somewhere (here most likely) that the T51p and the DT1350 share drivers.

after a 200 hours of break in on the objective2 + odac and dt1350 on those. now it sounds amazing. pretty sure it's not my brain getting used to the sound. anyways it's the perfect set up for office hours music listening. the dt1350 doesn't sound that good on my new samsung note 3. not enough volume. need to root to get the sound unlocked they say.
 
the dt1350 is a good purchase. takes forever to break in but they are amazingly accurate.

Could I get some help with these headphones?
 
The rivet have become really loose, before I could adjust them so the earcups do not lean on the back of my ear. But now the rivet is loose, its hurting my ears...
 
Anyone know how to tighten the rivet without sending them to beyerdynamic? It is under warranty but I do not want to deal with shipping..

Speaking of reliability issues, I'm just breaking in my second pair of DT1350s - the first had a stuck earcup adjuster and was replaced, very quickly, by the retailer. Not sure how well Beyerdynamic would do if it were warranty work.
 
The second set actually seems to sound better, but it's still early. I have high expectations of what the sound will be after 20-100 hours. Right now they do some things really well, some other things quite badly. Orchestral music especially is often very small-sounding and congested, but at the same time with many details still present. Other complex arrangements can be much more spacious and well-separated. Very odd, but could be just burn-in effect. I hope.
 
My comparison is to Beyer DT250-250, Grado SR80, Senn HD580, PX100II, all of which are way more open-sounding, even the closed Beyers. I haven't connected the DT1350 to a custom DAC yet, and that's how they should sound best. The DT250-250 are very nice with that DAC.
 
I'm a little concerned about the physical reliability of these. The earcup adjusters are not smooth, but seem to hang a bit. That's how the first pair was before jamming completely. Otherwise, they APPEAR to be well made and of good materials. Time will tell much.

Retracted!

Retracted!

Here's the issue I'm having with my not-quite broken-in DT1350s - they do almost everything really well, such as small ensemble acoustic, jazz, much of the rock I've tried. Even some of the more complex orchestral passages are decent, but then along comes one that's well-known to me, with good dense string sound, and it sound really bad on the Beyers. Like an ill-defined, oddly resonant blob of sound. This is not getting any better with additional burn in, so far.
 
This doesn't change with repositioning the pads on my ears, and I can tolerate the considerable clamping force pretty well.
 
The bad effect isn't reflected in any data I've seen, and can't be limited to a bass-mid-treble spectral definition. I suspect it's more related to chamber resonance and the transient damage it does. Really, how good could a headphone sound if it projects into such tiny earcups? 
 
This for me is a deal breaker unless I somehow acclimate and/or the 'phones actually improve with use. After suffering through some of my favorite classical music, I'm so relieved to so back to my PX100II, SR80, or DT250-250. But then curiosity brings me back to the Beyers, listening for the good stuff it can do.

Try moving them further back on your ears, like this:
 

 
If that doesn't work try other positions. I've noticed they sometimes don't sound their best if I don't have them positioned just right.

Thanks for replying! I think the rearward positioning does help, but what I'm hearing is a tiring harmonic distortion, one that's completely absent with the PX100II, as a quick comparison. Really doesn't seem as though that's likely to improve much with time. Just not much fun to listen too!
 
Hate to bail on these 'phones - I got such a good deal on them!

Hmm. You said it happens with string instruments? So that sounds like maybe its in the mids somewhere? I know I've read many times that everyone has basically a different frequency response in that range based on your ear canal so its common for people to have issues in that area while others don't with the same headphones. Maybe there's something about the 1350's FR that isn't vibing well with your ears. I haven't heard any noticeable harmonic distortion, just somewhat recessed and blurred mids if I don't have them positioned ideally. There could be others that have had the same experience as you but I've been following a lot of Beyer & 1350 threads and I don't think I've heard anyone complaining about harmonic distortion so that's interesting. I'll try some strings on mine and see if I can spot anything.

Is there a particular track that I can listen to on my 1350's to see if I can hear the distortion?