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T1 channel imbalance (and Beyer Tesla headphone variance issues) - Page 5

post #61 of 83
Thread Starter 

OH LOL - definitely not 12kHz in terms of EQ bands! Way too wide as you said. But I've found the occasional high Q very narrow spikes past 12k less harmful than similar spikes from 6 to 9k.

post #62 of 83

Of course, it probably depends on how loud the spikes are and on the listening material as well. Going back to ATH-A900, you don't hear this spike at 12 khz normally, only with occasional S'es, cymbals and high pitched instruments, as I mentioned. Then you understand something is not quite right confused_face.gif

post #63 of 83

for revealing high order harmonics in stringed instument named Piano t1 are effective end of story enough said good with low harmonics too though, basically they take getting used to people used to wonder what would happen when a plane broke through the sound barrier some thought the plane would explode turns out it becomes calm, the t1 has this effect as once you achieve break 1 tesla all is calm and clear . sha ding.. as for the channel imbalance said person may have burned in his pair with un harmonic music henece its unharmounic out put! be nice to your t1 and they will be nice too !  

post #64 of 83

What just happened?  blink.gif

post #65 of 83
Originally Posted by Anaxilus View Post

What just happened?  blink.gif

I'm assuming something similar to this:



Considering the non-gaussianity of implicit assumptions (Malmquist, 1936), there is a straightforward solution: to bootstrap a majority of the generalized principal components.

Taking account of the robustness of wavelet transforms (Einstein, 1913), it would be interesting to correct the major part of the photometric least-square estimates.

Assuming the asymmetry of analytical integrations (Malmquist, 1936), it is appropriate to simulate by Monte-Carlo all quantiles of the biased methods.


Warning: Spoiler! (Click to show)


post #66 of 83
Thread Starter 

I've listened to quite a few pairs and it's taken me a year to finally hear a grade A T1 again! Two T1's I've heard recently are grade B. Another was grade C (or F depending upon how you like to look at it.)


Here's how the grade C measures. It basically sounds thin and pretty much like crap. It's my belief that extremely poor driver matching brings you the worst of both channels.



Here's how the grade B measures. It sounds bright - in a strident kind of way - I am trying to be polite here instead of my usual self.



Unfortunately I haven't been able to measure any of the grade A T1s. The Grade A sound very nice and are similar to foam modded HD800s with a slight narrow peak in the treble.



The distributions of T1s I've heard are as follows. These are based subjective impressions.


x3 Grade A (A HF'er in the SF Bay Area, 2010 Bay Area meet, 2011 Bay Area meet)

x2 Grade B (2011 Bay Area meet, A HF'er in OC)

x1 Grade C (A HF'er who send in pair for measurements)

Edited by purrin - 2/21/12 at 2:41pm
post #67 of 83
That's weird. I wonder what grade my T1 is. I bought it from Meier Audio in December.
Im curious though, did you base those observations on their actual sound before or after measuring the response curves?
post #68 of 83

I'm also curious. But I get the feeling mine are of the better cut since the highs are actually quite sweet and very rarely ever show any sibilance. Certainly less bright than the HD800's I tested anyway. 

post #69 of 83

Apart from driver matching, FR isn't really an issue for me as that's a more subjective than technical issue for most.  What bothers me that I've heard in every T1 is the varying degree of issues wrt impulse response and distortion.  





These attributes are what I tend to think of as 'refinement' in an overall sound signature.  Even though the 'A' grade T1 was better than the rest there was still that hint of unrefined character that even the DT880 doesn't seem to have.  Could be why many prefer the T1 for genres like Rock where crunch is better than liquidity, just a guess.

post #70 of 83
Thread Starter 
Originally Posted by Naim.F.C View Post

I'm also curious. But I get the feeling mine are of the better cut since the highs are actually quite sweet and very rarely ever show any sibilance. Certainly less bright than the HD800's I tested anyway. 

Sounds like you got a good one.


post #71 of 83

Did you happen to record the serial numbers for the different "grades" of T1s?  It seems to me that the newer models have far less of a treble peak.  My T1 is in the SN51XX range and it seems to mirror InnerFidelity's results for the SN3964 T1.  The graphs for the earlier T1 are pretty ugly, and I doubt I would be happy with a can that ran so hot in the treble.




Edited by misformatt - 2/22/12 at 5:01pm
post #72 of 83

I'm both intrigued and concerned. The T1 is the only pair of open headphones I own, and I have been debating on trying the T1.


I love my T1, but now I can't help but wonder how balanced or imbalanced my T1 is.

post #73 of 83
Thread Starter 

Three DT1350 measurements.


dt1350 r.txt.jpg








  1. Two of two T1s sound and measure differently.
  2. Three of three DT1350s sound and measure differently.

Edited by purrin - 6/23/12 at 10:10pm
post #74 of 83

Actually you have a measurement of a fourth DT1350 if you consider mine using the HD25 velour pads.  You could show this as well in how it brings down the bass on that upper one which is mine.  I feel having the velour pads makes the sound a little more balanced.

post #75 of 83

Has Beyer commented on these potential issues with the T1? If there are differences, perhaps they could make some money with an upgrade service.

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