Up to 16 speakers are available in the QX55 thanks to Bose™ Performance Series audio, which replicates sharp, high frequencies and low, resonant bass notes — and nearly every note in between — via custom-engineered tweeters, woofers, and other speakers placed inside the cabin. Bose's Advanced Staging Technology produces a wide sound stage inside the QX55 and faithfully replicates notes clearly for optimum sound quality. Bose's Centerpoint 2 technology automatically converts two-channel stereo sound into a virtual surround sound listening experience via advanced digital signal processing. The result? A personal concert experience wherever the QX55 travels. The Bose™ Performance Series sound system is standard on QX55 ESSENTIAL and SENSORY grades.