TOPIC:

I was doing some measurements with a DT880 when I noticed a 4 dB difference at 5 khz. (The differences were also present at other frequencies though lesser.) I figured the cause of this was headphone driver mismatch. The DT880 is perfectly symmetrical. That means I should be able to flip the headphones around and get the same results on the other microphone. However on the second measurement, the left channel was now measuring the exactly the same as the right channel did on the first measurement and vice versa. This indicates there's a large discrepancy between the left and right microphones and not the headphone drivers. Applying the correct calibrations did not fix the issue at all.

Is my unit defective? Or was my calibration files not correctly generated? Once I get home from work, I will post my measurements which show the issue.

Here's some example measurements. I've taken more than a dozen measurements. The discrepancy at 5k is always there regardless of headphone placement variation. I also tried looking at some other headphones to see if the same difference was there. The problem is most headphones have a sharp slope at 5k and have more variation due to driver mismatch and positioning.