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Constant Voltage (70-Volt) Audio Systems For Beginners
https://www.parts-express.com/70-volt-systems-beginners
Constant Voltage (70-Volt) Audio Systems For Beginners High-Impedance Loudspeaker Distribution Audio distribution systems, especially those commonly used in department stores, warehouses, around race tracks, etc., require that many loudspeakers be driven from a single audio amplifier over long runs of speaker wire.
70 Volt Distributed Audio Systems - Terra Speakers
http://terraspeakers.com/70-volt-distributed-audio-systems/
70 Volt Distributed Audio Systems. Most of us are familiar with impedance matching for distributed audio systems. Resistive and autoformer impedance matching volume controls, unrealistic wattage ratings and more can conspire to make your life difficult if you’ve got lots of speakers to install for a distributed audio system. Feat not.
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.
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.
70 V Sound System Myths - Professional Audio Training
https://www.prosoundtraining.com/2016/06/23/ten-70-v-system-myths/
The 70 V system is just a means of signal distribution. It has nothing to do with the type of loudspeaker used. While 70 V distribution works well for ceiling loudspeakers, the amplifier doesn’t know or care about “what” or “where” with regard to loudspeakers. Do you have separate circuits in your house for toasters, TVs, and lamps?
Amazon.com: 70 volt audio transformer
https://www.amazon.com/70-volt-audio-transformer/s?k=70+volt+audio+transformer
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