The open, supra-aural, dynamic PMX 40 are stereo neckband headphones for portable players. With single-sided cable.
| Frequency response | 20 - 20000 Hz |
| Cable length | 1,5 m |
| Impedance | 24 Ω |
| Sound pressure level (SPL) | 116 dB |
| Ear coupling | supraaural |
| Transducer principle | dynamic, open |
| Jack plug | 3,5 mm stereo |









