70v Wiring Diagram
If a system has a 100 watt 70v amplifier and more speakers are added so the load is greater than 100 watts the next larger amplifier maybe a 70v 150w amplifier can be used to replace the 100w amplifier.
70v wiring diagram. Four zone 70v unbridged wiring the illustration below shows the wiring for a single channel of a ds70 being used in standard 70 volt mode. How to wire a basic 70 volt system on episode 5 of pro acoustics tech talk duration. Follow the nearest vertical line up to its intersection with a diagonal wire size line. Pages 64 67 explain 70v systems and pages 68 69 explain self amplified systems.
Speaker layout wiring methods and phasing are the same for either technology and are covered on pages 70 76. No wiring changes to the speaker circuits are required. 70 volt speaker wiring limitations chart instructions. Determine the combined output in watts for all speakers on a line.
50 volt line and 25 volt line speaker. Many loudspeakers are placed across this 70 volt speaker line using distribution transformers at each speaker to convert this high voltage back. The principle is the same as for 100 volt line systems but uses a maximum output voltage of 70 volts. All wires are easily accessible.
This is commonly known as a 70 volt line speaker system. Pro acoustics 3 587 views. The t725 can be tapped at 4 2 1 1 2 1 4 and 1 8 watts while the t72510 can be tapped at 10 5 2 1 2 1 1 4 and 5 8 watts. This equates to 70 71 volts rms.
No changes to the power taps on the speaker transformers are required. While 70 volt line systems are still the most common in the usa some 100 volt lines systems are being used. If one or more speakers fail the remaining speakers continue to operate just as before. Find that value at the bottom of the chart.
Advantages of 70v high impedance audio distribution systems. An 8 ohm secondary connects to the speaker and the multi tap primary connects to the 70v or 25v amplifier output. In this kind of setup the output level controls of the power amplifier can be used to control the volumes of each of the four zones. Central amplified systems pages 64 67 self amplified systems pages 68 69 power lost in wires watts resistance of wire ohms current flowing in wire.
Follow the horizontal line nearest the intersection to the left.