70V Line Speaker Wiring: Difference between revisions

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Similarly, we can apply a high voltage audio signal to a speaker line as long as there is a transformer at the speaker end to reduce the voltage to appropriate values for the drivers. Usually this system is used to distribute audio to a large venue with many speakers. In some cases, a constant voltage system is used to save money on speaker wire.

The reason the audio industry settled on 70 Volts is so all audio wiring can be installed without conduit. Many electrical codes of the ~~50s and 60s~~ stipulated that voltages of 100 or more Volts must be installed in conduit. Modern codes break audio and signaling voltages into various classes. Class 2 covers typical speaker wiring installations. The main implication is that primary wiring and Class 2 wiring must never be placed in the same conduit or junction box.

The reason the audio industry settled on 70 Volts is so all audio wiring can be installed without conduit. Many electrical codes of the time stipulated that voltages of 100 or more Volts must be installed in conduit. Modern codes break audio and signaling voltages into various classes. Class 2 covers typical speaker wiring installations. The main implication is that primary wiring and Class 2 wiring must never be placed in the same conduit or junction box. Note that the voltage is not ''constant,'' as its name seems to imply, but does actually fluctuate with the audio signal. The tapped transformer Power to the speaker voice coil reaches its rating when the speaker line Voltage reaches 70.

== Loudspeaker connection ==

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 Similarly, we can apply a high voltage audio signal to a speaker line as long as there is a transformer at the speaker end to reduce the voltage to appropriate values for the drivers. Usually this system is used to distribute audio to a large venue with many speakers. In some cases, a constant voltage system is used to save money on speaker wire.
-The reason the audio industry settled on 70 Volts is so all audio wiring can be installed without conduit. Many electrical codes of the 50s and 60s stipulated that voltages of 100 or more Volts must be installed in conduit. Modern codes break audio and signaling voltages into various classes. Class 2 covers typical speaker wiring installations. The main implication is that primary wiring and Class 2 wiring must never be placed in the same conduit or junction box.
+The reason the audio industry settled on 70 Volts is so all audio wiring can be installed without conduit. Many electrical codes of the time stipulated that voltages of 100 or more Volts must be installed in conduit. Modern codes break audio and signaling voltages into various classes. Class 2 covers typical speaker wiring installations. The main implication is that primary wiring and Class 2 wiring must never be placed in the same conduit or junction box. Note that the voltage is not ''constant,'' as its name seems to imply, but does actually fluctuate with the audio signal. The tapped transformer Power to the speaker voice coil reaches its rating when the speaker line Voltage reaches 70.
 == Loudspeaker connection ==