Yes, if you need to replace both drivers, it's cheaper to buy the whole DT880 second hand (and hope that drivers are OK).

I went through A LOT of Beyerdynamic headphones over the last few years and repaired many of them. The common problems that cause buzzing in the bass region are hair on the membrane (those can usually be removed), deformed coil (game over), unglued membrane (game over, at least for me, I haven't...

I replaced the driver and the polarity is OK. This further confirms that in recent Beyerdynamic DT770/880/990 drivers with a stamp like the one pictured above, the positive (hot) connector is marked with 1, the negative (ground) is marked with 0.

Thanks, that actually helped. The YT videos I saw before only showed older type of drivers (with 3 wire posts and pen marking). But now I found a more recent video (from this year) with the latest driver type and the guy confirms that 1 and 0 on the stamp do mark the positive and negative...

That's obvious but doesn't help with these particular drivers at all. Unlike most mass production drivers, Beyerdynamic drivers do not have consistent polarity within a model (certainly), or even a manufacturing batch (probably). Meaning that you can have 2 identical Beyerdynamic DT880 600 ohm...

I have to replace a dead driver in DT880 (600 ohm, recent version). I've bought a replacement and have a small problem. On older drivers, Beyerdynamic used to simply mark the hot (+) post side with a colored marker, so it was really easy to figure out which post was hot and which was ground. On...

I did - sort of. I had to go by memory because my original version already had stock tubes replaced with Russian ones and I had to rely on my memory comparing it to my friend's revised version with stock tubes. My impression was that they were similar with stock tubes: not bad, but definite room...

I used this cable, the quality is decent. Diameter should be OK for T51 cups.

Did Nobsound NS-08e change from 9pin to 7pin? Yes, in 2018 I think. Old version - 9 pin, new version - 7 pin. It has been discussed here, unfortunately sometimes you have to read the whole thread, not just 1 old post.

Do you have an MMCX-terminated cable you really want to use? I'm asking this because I have very bad experience with MMCX connectors on HP wires, they become intermittent very fast (in my case a few weeks of moderate use). I actually modified the Onkyo headphones I have to replace the MMCX...

Cheap replacement cable for HD477 / HD497 / HD212 Pro / eH250 / eh350 (Sennheiser part number 083380) will fit HD700.

OK, in that case your best course of action is to try with a different cable. That will tell you where the problem is.

Yes, in one pair. It was either the cable itself or the remote (I have T51i). The other had a driver problem (lower volume) and a cable problem (intermittent sound). Recable the T51. Either yourself, or pay someone to do it. Not all headphones. Dt770/880/990 have decent cables, not great but...

Could be a cable issue or a driver issue. If its a T51i and the right channel, it could also be the remote. No way to know without trying with a different cable. From what I read, the cable is a much more likely cause, but I have 2 pairs, both had this problem, in one case it was the cable, in...

That's not a QC problem, that's a cheap materials problem. Almost all "portables" suffer from this, especially when it comes to cables.