Hercules HDP DJ-Adv G501 Advanced DJ Headphones Advanced DJ headphones: DJing with style & comfort 32 ohm drivers: low enough impedance for strong output volume on DJ gear, computers and mobile audio players Effective passive noise cancelling; Soft, large ear pads: isolate the DJ's ears from ambient noise; Closed-back ear-cups prevent sound from bleeding out 50 mm diameter drivers: clear playback for deep bass response; 10Hz-25kHz: wide frequency bandwidth, to monitor any audible frequency; 102 dB at 1 mW sensitivity: enough decibels to preview even close to PA speakers Swivel housing for any use and any DJ; Easy 1-ear monitoring; Easy folding and mobility; Extending arms for both large and small heads