I listened to Aja on the T1. The cybals sounded like glass and I don't mean that in a good way. If that's not something you consider a reference album then I'm just going to assume you're trolling.

Hm, I'll have to get my Bijou up and running again to test this out myself.

Early production of T1, some 1800 units, was plagued by the overly hot treble. This problem was subsequently solved by the manufacturer but T1 never seemed to recover from those early impressions. Ignoramuses still play the tune.

How do you know this? Did someone at Beyer tell you this? Or did Monte Carlo result in the later ones that you happened to have heard have better tonal balance? Just curious as I feel such claims should be substantiated or qualified (anecdotal, a few samples, etc.) In my own experience of sampling about a dozen, 40% of T1s were the "good" tonal balance models. This was circa August 2012. Unfortunately, I did not note the serial numbers. For the three pairs we have measured here, I have always suspected that there may have been two variations of the driver. A bright driver and a less bright driver.

Misterrosters had a T1 which was consistent between both drivers, but evidently got one of the "bright overly" hot treble models. I don't have a measurement of this unit. We have two measurements of "decent" or "corrected" T1s:

http://www.changstar.com/index.php?topic=66.0
http://www.changstar.com/index.php?topic=474.0

Now let's say Beyer corrected the T1 after 1800 units... then how did this happen? Did Beyer match one of the older "hot treble" drivers with one of the "corrected" drivers?


http://www.changstar.com/index.php/topic,30.0.html

SECONDARILY, despite the better tonal balance of the say "corrected" T1 units, the treble still maintains a rough plateau around 10k and has very evident ringing a 7.5kHz (not a good spot - see image attachment below). I know a lot of hobbyists here at Changstar who would definitely complain about this. (Keep in mind that many people don't like the HD800 tonal balance either).

Given Beyer's QC record with other headphones, I would prefer to label the people you call "Ignoramuses [who] still play the tune" as cautious consumers.

Do you know how to position T1 on your head and ears? The incorrect position gives thin and trebly sound. 

No we are all stupid here. We don't try different amps, different sources, mods, tweaks, etc. We are all stupid. Please have Beyer send us a manual on how to properly position the T1 on our ears.

T1 exposes badly done recording and mastering of sound and that is what any decent headphones should do...

This is nonsense and uses the same ol' same ol' excuse as people who defend the HD800 as neutral. What you are saying is pick a specific recording which just happens to have less spectral energy around 10kHz, and it will be fine with the T1. Most of us tend to use a wide variety of recordings for evaluating headphones. Some recordings with good tonal balance, others marginally dark, others marginally bright. The headphones with good frequency response will play EVERYTHING without a much of a fuss.

Early production of T1, some 1800 units, was plagued by the overly hot treble. This problem was subsequently solved by the manufacturer but T1 never seemed to recover from those early impressions. Ignoramuses still play the tune.

Apparently you should count me among the Ignoramuses. I have listened to at least 3 T1s in the last year (one a AK mod) and I find them all suffering from unbearably hot treble. I bet none of them were those 1800 units.

If a headphone requires very delicate head positioning or very specific amp to not be awful, it's not a good headphone. Even some of the hard to drive headphones like the HD800/HD650 sound great with *lots* of amps.