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 5.25 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 5.25 in. woofer provide amazing stereo performance.