Dual-voice coil speakers provide inexpensive, "full stereo sound" from 1 single speaker. They are a great choice for those on a low budget, or those who prefer only one speaker in a smaller area (ex. hallway, bathroom, closet, etc.). The 8 in. Muro Dual Voice-Coil Stereo Ceiling Speaker has 2 inputs (one for the left channel, and one for the right channel of an amplifier). These dual terminals, in combination with the twin angled dome tweeters and included 8 in. woofer provide amazing stereo performance.