Hi T1 owners! Happy new year BTW :-)
Here comes a little T1 tuning story, I sticked with my T1 for a few weeks now, and love all the strengths of this headphone, except the 8 kHz peak that make the sound a bit harsh and synthetic, in this case the HD800 do better (asymmetrical housing, more later on), but the Senns don't fit onto my marble.
Till now I corrected the T1 peak with a EQ, but this was not really satisfying, I want a T1 at it's best with every source and pure direct sound.
As told, the cause for the peak is the circleround housing, the angled positioning of the driver may help to minimize amplitude peaks in some frequency regions (a Beyer technician told me this), but is no solution for the 8 kHz problem, the peak is still to extreme to ignore it.
How to make a keeper out of a technical tempting T1?
My first trials to fix the peak with damping materials in the driver chamber worked, but they also affected the great T1 soundstage, tooked to much highs and sounded compressed in the lower mids / bass.
But now, after the 3rd round of experimental damping (less is more), I reached to eliminate the peak without bothering the transparence of the Beyer, antipode: The T1 sound is overall flawless and colorful. Mrs. Melua never had such a clear voice, and there is no loss in high frequencies (except the ugly peak).
Dropp off (or not, depends on the individual): Low frequencies / bass sound getting slightly punchier.
How to do?
All you need is a little polishing cotton wool and a thin binder. Just twist some cotton wool to a compact "tampon" that stays in form and fix it with the binder to the mass cable. If you want to, wrap the tampon slightly with a thread to fix the form.
The ADE (acoustic damping element alias tampon ) splits the round housing in 2 halfs (less interferences caused by the new geometrical design of the housing) and absorps the sound particle velocity (correct translation?) around 8 kHz.
Don't make the tampon bigger than that you see at the picture. Make sure the ADE is compact and clamps between housing and baffle when reassembling. The ADE reaches to the big driver vent hole, so it's covering 1/3 of the driver.
Avoid covering the sound pervious areas more than required – voilà.
Edited by Airwin - 1/1/11 at 4:22am