Robust build meets unparalleled fidelity. The Allen and Heath QU-SB Portable Remote Controlled Digital Mixer provides you with the ultimate mixing experience. Feel equipped to say yes to any project. The QU-SB features 16 premium channels one stereo input as well as 12 on-board mix outputs and a stereo matrix out. Need more inputs? Expanding your set up is no issue either. Simply use the SBs I/O to connect to an Allen and Heath AudioRack. The inclusion of a personal monitor app available for all iOS and Android devices allows you to mix from any perspective in the venue. Thanks to this youll be able to prepare for every possible scenario you can anticipate. Dont second guess get it right the first time thanks to Allen and Heath.