Welcome to the SQ Reference Guide. Designed for applications where high-quality audio mixing and processing is required in a compact and reliable unit, and built on an Allen & Heath XCVI . Below you will find the product specifications and the manual specifications of the Allen & Heath SQ5. The Allen & Heath SQ5 is a digital mixing console designed for live sound and studio . Find resources for the Allen & Heath SQ-5 digital mixer, including technical datasheets and firmware g: Pdf.