| HEADPHONE TYPE | NOMINAL IMPEDANCE PER EAR | VALUE OF CALIBRATION RESISTOR |
| Beyer DT-150 | 250 ohms |
13K |
| Beyer DT-250 | 250 ohms |
10K |
| Beyer DT-770 | 600 ohms |
10K |
| Beyer DT-100 | 2K ohms |
6K2 |
| Beyer DT-100 | 400 ohms |
9K1 |
| Beyer DT290 Series | 80 ohms |
18K |
| Sennheiser HMD-410 | 600 ohms |
13K |
| Sennheiser HMD-25 | 600 ohms | 15K |
| Sennheiser HD-400 | 37 ohms |
27K |
| Sennheiser HD-480 | 600 ohms |
10K |
If you wish to use headphones that are not listed above, then please contact us for a quotation for the callibration.
Note: The calibration resistor is wired between pins 2 & 4 in the 5 pin XLR headphone socket.