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Constant Voltage (70-Volt) Audio Systems For Beginners
https://www.parts-express.com/70-volt-systems-beginners
Nonetheless, 70V systems are generally not used in home audio distribution systems as there are a number of other options that can provide better sound quality and features. For outdoor public address applications, horn-type speakers are used to direct and focus the sound over the area where it is wanted.
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.
70V Distributed Audio – Vellone Communication
https://vellone.com/wiki/70v-distributed-audio/
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 systems is the most commonly used for commercial …
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? Of course not.
Common Questions Regarding 70-Volt Audio - AtlasIED
https://www.atlasied.com/blog-constant-voltage-speaker-systems
The 70V system is just a means of signal distribution. It has nothing to do with the type of loudspeaker used. While 70V distribution works great for ceiling loudspeakers, the amplifier doesn't care what types of loudspeakers are on the line.
The Why and How of 70 Volt Audio Systems
http://erictraining.com/articles/AV/70-volt_cheat_sheet.pdf
1) A 70-volt system allows you to use multiple speakers without worrying about impedance issues, which can overload and damage an 8-ohm amplifier. 2) A 70-volt system allows you to run more speakers off a single amplifier. 3) A 70-volt system plays in mono, not stereo, so speaker placement is not as critical.
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