FOR CRITICAL LISTENING - The Beyerdynamic DT 770 PRO features a closed-back design that isolates outside noise. Ideal to use for DJ and music production monitoring. Plus, the music you hear doesn't bleed out of the headphones. INNOVATIVE BASS SYSTEM - With a closed dynamic transducer type, these headphones provide a heavier bass sound that's perfect for DJing. EXCELLENT FREQUENCY RESPONSE - This pair of headphones has 5-35,000 Hz nominal frequency response, which delivers a well-balanced Treble and flawless Mid-range.