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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 Constant Voltage Speaker Systems by: Joe Ging, E.E. “Constant Voltage Speaker Systems” have been a source of confusion for people for a long time. It’s ironic that a system that was specifically designed to make life simpler for designers and installers, still causes so much confusion.
audio - Speaker systems: When is 25 volt used vs 70 volt ...
https://electronics.stackexchange.com/questions/276591/speaker-systems-when-is-25-volt-used-vs-70-volt
25 volt audio is primarily used for School Paging/ Intercom systems. This provides the correct speaker impedance for intercom audio at lower wattage levels. When there is a 2 way intercom audio connection to the classroom speaker, the speaker acts as a microphone during listen function of the intercom audio connection (half duplex).
Voice Evacuation Systems - Notification Devices - …
https://www.systemsensor.com/en-us/Documents/VoiceEvacuationSystems_AppGuide_AVAG497.pdf
States require 70.7 volt or 25 volt, also known as 70 volt and 25 volt systems. These systems not only provide a safe, efficient way to connect many loud - speakers to one amplifier and make impedance-matching less complex, but they also ensure optimum volume, eliminate wasted power or stress
25 volt system | Sound Forums
https://soundforums.net/community/threads/25-volt-system.5021/
Is wiring a 25 volt system the same as wiring a 70 volt system,ie: set taps on speakers so that they do not exceed the maximum output of the amplifier? Also,opinion on NEC and 70 v systems. I see some references saying that 70 volt systems can use class C wiring methods to wire 70volt...
25/70V 50W Audio Amplifier - Plenum Rated (TAA Compliant ...
https://www.cablestogo.com/product/40881/25-70v-50w-audio-amplifier-plenum-rated-taa-compliant
The 25/70V 50W Audio Amplifier is the ideal solution for supporting a distributed audio system in a classroom, conference room or other environment that requires installation in a plenum space. This amplifier supplies 50 Watts of power, 25 Watts per channel, and is built to an industry standard 25/70 Volt design.
25-Volt Sound Masking Machine | White Noise Speaker
https://www.acousticalsurfaces.com/white-noise-system/25-volt-loudspeaker.html
The SMS-25V is a 25-volt system loudspeaker designed to generate the optimum masking sound for a variety of ceiling conditions. This sound masking machine is equipped with a 5″ driver installed in a sealed enclosure. The SMS-25V is typically installed in the plenum space, suspended between the acoustic tiles and the deck.
Amazon.com: C2G 40881 25/70V 50W Audio Amplifier, …
https://www.amazon.com/C2G-Cables-40881-Amplifier-Compliant/dp/B00MX08VIS
This amplifier supplies 50 watts of power, 25 watts per channel, and is built to an industry standard 25/70 volt design. This amplifier supports many advanced Features which make it a perfect fit for most applications. This amplifier accepts a 3.5mm and RCA stereo audio input as well as a 3.5mm microphone input.
Constant-voltage speaker system - Wikipedia
https://en.wikipedia.org/wiki/Constant-voltage_speaker_system
Constant-voltage speaker systems are also commonly referred to as 25-, 70-, 70.7-, or 100-volt speaker systems; distributed speaker systems; or high-impedance speaker systems. In Canada and the US, they are most commonly referred to as 70-volt speakers. In Europe, the 100 V system is the most widespread, with amplifier and speaker products being simply labeled with 100 V.
Constant-Voltage Audio Distribution Systems: 25, 70.7 …
https://www.ranecommercial.com/legacy/note136.html
In some parts of the U.S. safety regulations regarding conduit use became stricter, forcing distributed systems to adopt a 25 volt rms standard. This saves conduit, but adds considerable copper cost (lower voltage = higher current = bigger wire), so its use is restricted to small installations. Calculating Losses -- Chasing Your Tail
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