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PA System Amplifier Speaker Question

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Hal Bissinger/COMSYSTEC:

--- Quote from: John Roberts {JR} on April 01, 2021, 09:27:36 am ---Perhaps search for a white paper about "constant voltage" systems (in the US typically 70V).

--- End quote ---
That would be an excellent idea. However, keep in mind that the taps on speaker transformers are labeled in watts today which makes it easy to design your system. Just add them up.

What the OP has must be really old, I believe the original multi-speaker systems labeled the transformer taps with their impedance probably back in the 30's or 40's. You had to do some thinking if you wanted to have some speakers tapped differently than others to provide different volume levels.


Brian Jojade:
One of the cool things about 70v systems is that ANY amp will provide the same output for the system.  If you used a 250 watt amp or a 2500 watt amp, it won't make a difference in how loud the speakers are.  The only thing you need to be concerned with is that you don't overload the amp.  eg, if you put a 100 watt amp in the system, but it's tapped for 250 watts worth of speakers, you'll overload the amp.

If you want to split your speakers into 3 zones though, now you could use 3 100 watt amps. And, again, the volume remains constant even with the smaller amps.


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