On Sep 27, 1:33*pm, "Michael A. Terrell"
wrote:
" wrote:

On Sep 26, 10:51 am, "Michael A. Terrell"
wrote:
" wrote:

Thanks Michael. I'm bringing a lot of spare parts to the job with me
today and I'll let you know how it all works out. Best regards, Lenny.

* *You're welcome. I used to build those a couple at a time, to have
extras in my truck.

Michael
I used two 10K resistors off the secondary of a 70.7V transformer. I
felt that this would maintain a balanced line input to my amp. The
primary was tied to the incoming 70V line and was tapped at 4W. The
only balanced line inputs to the amp were mic 1 and mic 2. With the
10K resistors in series the level into the balanced mic input of the
amp was perfect. The amplifier was a Bogen 60W unit. We added two more
speakers to the system for a total of 4 all tapped at 4W. This is a
commercial kitchen with the unbelievable noise level of a subway
tunnel. Now they'll have no trouble hearing the pages. Thanks again
for the advice. Another fire put out. Best regards, Lenny.

* *You're welcome. *If that was a typical Bogen amp, the inputs are
transformer isolated 150 or 600 ohm impedance.

* *Try putting in a system in a corrugated box plant sometime if you
want noise! ;-) *35 watts covered the whole plant, except near the
corrugators, and each had their own 100 watt amp, with PA horns six feet
away from each operator.

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This is an interesting group
I just had an impedance issue i got help with on a project that I am
working on, in summary
I used CO sensors in a parking garage the rating on the comunication
bus is 2000ft, When I designed the project during estimation I took a
risk to strech to 3000 based on the probability that the voltage drop
would not migatate me. Anyhow to make a very long story short, it
turned out between my low volatge sub and my inherient nature for
taking small calculated risks, the com was 3500 ft, I tried to figure
out the best end of the line terminator , going back to the impedance
matching topic that sparked my interest, after calling some experts, I
got the matched impedance, but still need to and another 50VA
transformer.... lesson learned on my part

Thanks for sharing
Allan J Federman