[Magic77]

I have the Sony MDR-7520. When I start listening to music with these headphones everything is dead quiet in between songs and quiet passages. After listening for a while I begin to hear static on the left side only. Other headphones I use are OK, so it's not my amp or headphone jack. The 7520 has a detachable cable, not really sure if it could be a defective cable. Could the left voice coil be defective and creating static buildup? Thanks for any help or advice.

 

[hodgjy]

It might be a hair stuck on the driver.

 

[stacker45]

Don't laugh, but I have the same problem wit my Grado HP1000, and before each listening session, I rub them with a sheet of fabric softener.
 
If you decide to give it a try, please let me, (us),  know if it worked.

 

[Magic77]

The detachable cable is a standard 1/8 mini jack at the input of the headphones, so I'm going to try connecting another mini-mini plug cable and make sure it is or isn't a cable issue.

 

[Magic77]

So far, so good with replacement detachable mini-mini cable, no static yet with approx. 6 hours of listening. Another update coming soon.

 

[Magic77]

Now approx. 12 hours of listening and no static yet. So, I have confirmed that the problem is a defective Sony detachable headphone cable. Sony actually wants $135 for a new cable, I think that is way too much, so I will continue to use a regular mini-mini 1/8 cable which works just as good. So, if anyone owns the MDR-7520 and has a defective cable, just replace it with a standard mini-mini cable and save yourself $135.