Allen & Heath's Xone:23 is a 2+2 channel DJ mixer packed with pro features that would normally be found in the booth of a top-rated club, including an enhanced version of the legendary Xone filter with resonance control, VCA faders, 3 band total kill EQ, illuminated switches, cross fader curve selector and styling inspired by the flagship Xone:DB4. For I/O, the mixer includes two pairs of RCA line inputs and two pairs of RCA phono inputs. Though the mixer has two faders, each of the four inputs has an independent level control to enable playing up to four simultaneous sources in the mix. It also features dedicated stereo send and return channels for integrating external effects units. The front panel of the unit includes a balanced XLR input for connecting a microphone with level, high frequency, and low frequency equalizer controls. The master outputs are on balanced XLR connectors and the mixer includes a dedicated stereo booth output, as well as a dedicated stereo record out for capturing your mixes to a portable recorder. 1/8-inch and a 1/4-inch headphone connectors enable cueing with a wide variety of DJ headphones. For control, the front panel of the mixer features gain knobs for all four channels. The four inputs are slit into left and right sides, each with a 9-segment LED light meter, separate high, mid, and low frequency total kill EQ knobs, a VCA channel fader, illuminated cue button, and an illuminated button to engage the filter on that side. The center section includes an illuminated button for engaging the external effects send/return, an illuminated button for engaging a high pass filter, an illuminated button for engaging the low pass filter, a frequency selector knob for the filter, and a VCA resonance control knob from mild to wild. The cross fader features a switchable curve for mixing or scratching. As an option, the user can replace the stock cross fader with Allen and Heath's high end Inno fader for enhanced performance (sold separately).