Accessories: Adaptor plug 3.5 - 6.3 mm adapter Cable management Cable clip Connectivity Cable Connection detachable Oxygen free cable (3m) Sound Distortion <0.1% THD Diaphragm LMC Speaker diameter 50 mm Sensitivity 100 dB @ 1mW Maximum power input 500 mW Impedance 30 Ohm Frequency...

Power-infused performance Loaded with all the power you need, the Lumia 640 LTE works as fast and...

Quoted from Superlux manufacturer site: HD669 Professional Studio Standard Monitoring...