Definitive's BP2X is a true bipolar system containing two complete full-range speaker systems, one on each side of the cabinet. Bipolar technology is absolutely superior for surround speakers because it synergistically combines the performance advantages of direct radiating (imaging, focus, localization, and specificity) and dipolar speakers (spacious, sourceless, all-enveloping ambience) into one ideal system which is perfect for all discret 5.1 formats including Dolby Digital AC-3, DTS as well as the new Dolby EX and Dolby Pro-Logic.