The advanced Hercules HDP DJ Adv G401 Headphones deliver with outstanding sound reproduction, style and comfort They are built for Djing with drivers that are made for Djing. Their drivers are tailored for analytic listening: great for DJ monitoring, studio and production. Sensitivity of 100 dB at 1 mW provides enough decibels to preview your mix even close to PA speakers. The 50 mm diameter drivers offer clear playback for deep bass response and a wide frequency bandwidth of 15 Hz 22 kHz to monitor all audible frequencies. The Hercules HDP DJ Adv G401 Headphones offer a stylish 1 curve design: headphones form a curve from one ear to the other. The black fabric, glossy black housing with red lines, and glossy plating on top of the ear cups add to their modern visual appeal. The swivel housing allows for any use and any DJ: Easy 1 ear monitoring; Easy folding and mobility; and Extending arms to comfortably fit both large and small heads. Effective passive noise cancelling is afforded by the soft, large ear pads that isolate the DJ"s ears from ambient noise and closed back ear cups that prevent sound from bleeding out. They are designed for long term comfort: The headphones don"t press on the user"s head, thanks to the ear pads" width and softness, which forms a barrier around the ears.