Repairing/identifying what's wrong with Beyer M81
« on: January 04, 2017, 04:42:13 PM »
I just picked up a pair of Beyerdynamic M81s (M818 as a set) but unfortunately one of them is bad. The other one is ppretty great, though - so great that it makes my think about salvaging the broken one.

The problem is that there is very little output in the range below 250hz or so and also a quite noticeable dip in volume around 1.5khz. But when comparing with the healthy one, I notice that there is roughly the same output level and there is no hum indicating a ground loop.

I know many factors may contribute to these symptoms, but do you have some suggestion where to start in terms of figuring out what's wrong with it?


Re: Repairing/identifying what's wrong with Beyer M81
« Reply #1 on: January 05, 2017, 07:58:33 AM »
Check resistance of the output, check wiring.
If it have extra coil inside socket, then measure resistance before it.