Partyline: Would you possibly know the pinout for the Beyer DT-290 headset wiring to work with the AB-100 unit?
You can refer the pinout of the DT290 on the Beyer website, the wiring diagram is on page 21
Beyer DT 290 specs, pinout
Beyer DT 290 User manual
On the AB-100, the pinout of the headset connector is as follows:
1 Microphone Lo (-)
2 Microphone Hi (+)
3 Headphone Common
4 Left Headphone (+)
5 Right Headphone (-)
6 Microphone Shield