- OneOdio Monitor 80 studio headphones, wired, circumaural, open-back, dynamic, frequency range 10 - 40000 Hz, impedance 250 ohms, characteristic sound pressure 100 dB SPL/1kHz/1Vrms, 40 mm neodymium transducer, maximum power handling 1600mW, rated power handling 30mW, distortion factor at 1 kHz and 100 db SPL EUR 96.00 - See more - Buy online