"Jeff Liebermann"
klem kedidelhopper

The music is distributed via 70V lines at very low level
throughout the building.

Methinks not. The voltage on a 70v constant voltage speaker system is
(insert drum roll...) 70.7 volts rms.

** Absolute nonsense.

70V is the maximum voltage output from the amplifier and there is nothing
constant about it.

No way is it "very low" unless
something is broken or you're running at drastically reduced volume.

** Volume pots allow the level to be set at the operators convenience.

It is very common to have a low, background music level and a much higher
speech level for announcements.


The big advantage to 70v and 100v systems is that they can use cheap,
junk, small gauge wiring, such a CAT3 telephone wire for relatively
high power speakers.

** More nonsense.

The real advantages include the use of long cable runs with low losses and
having many distributed speakers - which do not need to be all of the same
rating type or level.


..... Phil