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The Why and How of 70 Volt Audio Systems
http://erictraining.com/articles/AV/70-volt_cheat_sheet.pdf#:~:text=A%2070-volt%20system%20allows%20you%20to%20daisy%20chain,you%20can%20set%20the%20volume%20of%20each%20speaker.
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.
All About 70-volt Speaker Systems - Belden
https://www.belden.com/blogs/broadcast/all-about-70-volt-speaker-systems/
First, you need to buy an amplifier that has a 70-volt output. These are commercial-grade products so you won't find one at a hi-fi or home theater store. The second thing is that you will need to buy a special transformer for every speaker running off this system. The picture below was provided by Parts Express.
Demystifying 70 V “Constant Voltage” Systems - Church ...
https://www.churchproduction.com/education/demystifying-70-v-constant-voltage-systems/
70 V systems go way back the days were when amplifiers and loudspeakers were in the 5- to 35-watt range. The idea was to raise the amplifier's output voltage (at the amplifier) to a nominal 70V and then reduce the voltage at the loudspeaker …
Constant Voltage (70-Volt) Audio Systems For Beginners
https://www.parts-express.com/70-volt-systems-beginners
Attached to each speaker in a 70V system is another transformer that changes the power back to "lower voltage/higher current" so that it can drive the 8-ohm speaker. These transformers usually have two output taps, one for 8-ohm speakers, and one for 4-ohm speakers.
70 Volt Audio: Introduction to the Products and Principles ...
https://www.cepro.com/news/70_volt_audio_introduction_products/
Essentially, use 70-volt speakers from mid and high frequencies, and use 8-ohm subwoofers to fill the bottom out. In many applications, this delivers a more robust sound, and actually allows the overall sound pressure to be lower. Since most 70-volt systems are monaural, you’ll find few amplifier choices in stereo.
What is a 70v sound system? – TIC
https://ticcorp.com/blogs/default-blog/what-is-a-70v-sound-system-preview-5c104335c7ee3
The installer simply need to add up the wattage of each speaker and make sure the total is under the power output of the 70v amplifier. Installation is a breeze since wiring can be organized in much simpler design, often in a daisy-chain. However, there are some disadvantages to using a 70v system over a traditional 8Ω system.
70 V Sound System Myths - Prosoundtraining
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
Using Ohm's law, we can take the voltage squared (70 x 70) divided by the wattage (150) and get a resistance rating of 33.66-ohms. An impedance meter can be connected to the loudspeaker wiring at the amplifier to confirm it is wired correctly. These systems are only for ceiling speakers. The 70V system is just a means of signal distribution.
Wiring a 70-Volt Audio System - YouTube
https://www.youtube.com/watch?v=4rcSd3Ql88Q
Follow these wiring guidelines to ensure you configure your 70V audio system properly. For more information, visit http://bit.ly/2bCnjPl.
25V, 70V, & 100V Constant Voltage Speaker Systems
https://www.lowellmfg.com/wp-content/uploads/What-is-a-25V-70V-or-100V-Speaker-System.pdf
25V, 70V, & 100V Systems: Longer Speaker Lines or Smaller Gauge Speaker Lines: The reduced cable loss that results from higher amplifier voltages in constant voltage speaker systems, allows the designer the option to run speaker lines farther, or to use smaller gauge cable to reduce the cost of the speaker system installation.
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