70V100V

70V100V refers to a common voltage class used in commercial and industrial audio distribution systems. This voltage system, also known as a Constant Voltage or High Impedance system, allows for multiple loudspeakers to be connected in parallel to a single amplifier channel without requiring individual impedance matching for each speaker. The higher voltage reduces current draw, enabling the use of thinner gauge wires over longer distances, which can significantly decrease installation costs.

In a 70V100V system, loudspeakers are equipped with transformers that step down the high voltage to a level suitable for the speaker driver. These transformers typically have selectable taps, allowing installers to adjust the power output to individual speakers, ensuring a balanced sound level across the entire listening area. The 70V and 100V designations refer to the nominal voltage output of the amplifier and the corresponding voltage rating of the transformers. While 70V is more common in North America and 100V in Europe and other regions, the principle of operation is the same. The advantage of this system lies in its flexibility and ease of expansion, making it ideal for applications such as paging systems, background music in retail stores, restaurants, and large public spaces.