On Sat, 10 Mar 2007 00:46:14 -0500, **THE-RFI-EMI-GUY**
wrote:

Jack Schmidling wrote:

Tim Shoppa wrote:

If you find a hi-fi or 70.7V PA transformer that's great....


What does 70.7v mean?


It is a standard method of distributing multiple PA or music speakers
from an audio amplifier. If you start out with a 100 watt amp with a 100
watt/70 V audio output transformer you can run small gauge wire to the
remote speakers. At each remote speaker a 70 V transformer steps down to
the speaker impedance by way of a tap corresponding to the power you
want delivered to the speaker. If you have 10 speakers, use the 10 watt
taps etc.

That must be some kind if americanism, since I have only heard about
100 V lines, for distributing audio power at a reasonable level around
a large house,

Paul OH3LWR