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Old 9th May 2009, 04:48 PM   #11
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Originally posted by dBel84
These headphones work on a planar principle and as such the sound is intricately connected to the speed of the diaphragm. One of my biggest cautions with trying to repair this driver is not to change the density/weight unevenly on the single surface and more importantly, relative to the second driver - any imbalance is easily perceived in headphones and would negate the initial effort.

I speak from a little experience here as I have unfortunately had to repair a similar driver for another friend and the repaired driver works well but the channel imbalance is frustrating and measures to correct this imbalance have resulted in an inferior sound ( it is still superb but not as good as it was and this knowledge gnaws away while using them)

thanks for all the input, the collective process may yet yield a simple solution..dB

I doubt that the added mass from this repair has any effect upon the sound.

Did you measure the DCR of the two sides, repaired and not repaired? I'd bet that the repaired one has a higher DCR than the not repaired one, and that accounts for a differential, not the mass addition.

IF the mass addition really changed the left/right response it would make sense to add slightly to the mass of the opposite side driver at the same place on the driver with a "dummy" (non conductive) material.

Really the mass of the repair ought to be insignificant.

_-_-bear -- Btw, I don't actually know anything, FYI -- every once in a while I say something that makes sense... ]
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Old 10th May 2009, 05:41 AM   #12
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Old 11th May 2009, 11:02 AM   #13
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I am having the same problem with my Technics EAH-820 orthodynamic headphones. The only viable repairing method would be to use the intact diaphragm as a photomask, and to photocopying/etching a new diaphragm. I found a roll of food wrapping aluminized plastic that seems to be suitable.
Eventually, I sourced a second pair of the same type headphones off eBay, so I don't bother with the photo duplicating any more...
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Old 11th May 2009, 01:23 PM   #14
dBel84 is offline dBel84  United States
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The ideal would indeed be to find a second pair . congratulations on finding another T-820.

I have repaired one of the fostex oem type drivers in the past, it is a little easier to use a conductive ink because of the high tension in the driver. .dB
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