SPECIFICATIONS: Channel Quantity:18 mono/4 stereo Insert:16 Dimension(mm): 716X466X88 Box sizes(mm): 766X520X180 Stereo aux peturn:1 Stereo play in :1 Stereo main out:bal+unbal Group out:4 Aux out:2 Effect out:2 Stereo record out:1 Headphone out:1 FEATURES: 4-28 mono input channels and 4 stereo input channels(2 ST input channels can also be used as MIC input channels). Signal indicators and peak indicators on all input channels. There-band equalizer for each input channel. Insert function for each mono input channel. 6-segment LED meters show the level of the master and 4 group outputs each other. Two kinds of sockets for main out can be selected,balanced or unbalaced. 2 AUX inputs,2 AUX outputs and 1 stereo record outputs. Built-in 24 bit stereo DSP digital effects processor,MX-6D has 99 presets,LCD display. Built-in+48V phantom power for condenser microphones. Quick monitor,more check points can be selected,main out,group out or each input channel. Group output signal can be fed to the main buses. Built-in power supply. Max output level:+20db/+26db Equivalent input noise of microphone input channel:-124db. Total harmonic distortion:<0.1% Frequency response:20-20Khz+1+/-2db. The mixer can be equipped an inner USB audio interface,by this part the mixer has a 16 bit/48 Khz A/D&D/A conversion function and an USB data communication(communication rules with USB 1.1)function.Achieve the two-way exchange of PCM digital audio format between the computer and the mixer.