The 8.52DVA2FG features advanced technology, such as the dual voice coil design (DVC). DVC delivers two-channel sound from a single speaker, provided by two quality dome tweeters (the left and right channels are divided between the two). The DVC design is a valuable feature in many everyday situations. For example, when conventional speakers are placed along a hallway, the stereo experience will shift as you move between the right and left speaker. Fitting a pair of 8.52DVCA2FG speakers will eliminate this effect, as you have both left and right channel coming from just one speaker. The I/O 8.52DVCA2FG is an excellent, value-priced in-ceiling sound solution.