The headset has a electret mic. I didn't measure the resistance. It sounded perfectly adequate when I used it on my pc.
Hower, the output from the mic seems too low using it with my QMX+.
I did try two other electret capsules I had in my junk box, they were marginal improvement over the headset mic.
The headset works great with the mic preamp, however.?
The mic gain is set to 35 and compression set to 3, produces good results on my QMX.