The QM500 is a passive two way bass reflex design speaker suitable for mobile or installation use. The design characteristics of the QM500 make it suitable for both full range use or as the high-mid component of a multi way system with sub-bass enhancement. The patented phase device high frequency transducer is matched to a rotatable asymmetrical wave guide that can be rotated through 270 degrees for horizontal, vertical or fold-back monitor installation. The asymmetrical coverage allows the horn to achieve both long throw performance and wide angle close coverage without "hot zones" or adding to unnecessary room reflections that can degrade vocal intelligibility. The unit can be used in a standalone configuration or as part of a system coupled with any Quest sub-bass system. When used in conjunction with these devices, the QM500 will form part of a high performance multi way audio system.