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All About 70-volt Speaker Systems - Belden
https://www.belden.com/blogs/broadcast/all-about-70-volt-speaker-systems/
So the 70-volt distributed speaker systems are mostly confined to low audio-quality applications such as background music or paging. Supermarkets, hotels, hospitals, airports are where you will find 70-volt distributed loudspeaker systems; anywhere you have more than a dozen speakers. While the power amp might be a few hundred watts, most ...
Constant Voltage (70-Volt) Audio Systems For Beginners
https://www.parts-express.com/70-volt-systems-beginners
A "constant-voltage" or "high-impedance" audio distribution system is commonly used to overcome these and a number of other possible problems. These systems are also referred to by their nominal voltage, with "70-Volt" and "25-Volt" systems being the most common references.
70 Volt Distributed Audio Systems - Terra Speakers
http://terraspeakers.com/70-volt-distributed-audio-systems/
Feat not. There’s another more effective and efficient way to solve this problem. Originally used exclusively in commercial applications, 70 volt audio distribution systems are becoming more common in today’s larger residential installs, not to mention their use in light commercial applications.
70V Distributed Audio – Vellone Communication
https://vellone.com/wiki/70v-distributed-audio/
By John Vellone. There are two types of audio amplifier on the market. Constant Current Amplifier (like your home stereo amplifier), which have a low impedance output of either 8 ohms or 4 ohms, and Constant Voltage Amplifier (used for commercial distributed audio systems) which have a high impedance out put identifies in 25 volt, 70 volt, and 100volt output. 70 volt …
From the Q and A | Nuts & Volts Magazine
https://www.nutsvolts.com/questions-and-answers/70-volt-audio
The 70-volt distribution system was developed to convert the output of a PA amplifier to a higher voltage so as to minimize power loss when speakers are located long distances from the amplifier. Plus it simplifies the connection of multiple speakers that do not have the same impedance.
Demystifying 70 V “Constant Voltage” Systems - Church ...
https://www.churchproduction.com/education/demystifying-70-v-constant-voltage-systems/
Demystifying 70-volt Systems. Not meaning to disparage the dead but this article is mostly incorrect and based on misinformation rather than fact. The so-called 70-volt system is mis-named; it is more correctly called a constant impedance system and like Paul Johnson says, is sort of an audio equivalent of the power distribution in your home.
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