Denon's flagship 4-channel mixer sets the standard for Club, Mobile and Battle DJs with powerful, innovative features that allow both flexibility and creativity. To achieve this exceptional performance, a floating 32-bit SHARC Digital Signal Processor empowers the fully digital circuit, ensuring low noise and exceptional audio fidelity. The Effector and Sampler are built-in to further boost the DJ's creative powers. The all new Flex Fader cross fader was carefully crafted to withstand the rigorous performance of the toughest DJs. Additionally, the DN-X1500S is conveniently equipped with a USB port, allowing firmware updates via a PC. Constant Digital Output - 44.1 kHz, SPDIF - Allows you to record directly to CD-R or hard disc device via coaxial digital output terminal Mic Post Feature - Passes the Mic signal into BOOTH, REC or DIGITAL output signal path. A great feature to avoid feedback in the DJ booth or unwanted announcements on your recordings. Booth Output - You can pre-monitor any channel and effect through the booth output as you would with your headphones, only out loud! Frequency Response - 20 Hz to 20 kHz Signal to Noise Ratio - Line - 85 dB Phono - 73 dB Main Mic - 65 dB Total Harmonic Distortion (THD) - Line - Below 0.02% Phono - Below 0.05% Cross Talk - Over 70 dB Unit Dimensions