Re: Public address system
- From: Jim Thompson <To-Email-Use-The-Envelope-Icon@xxxxxxxxxxxxxxx>
- Date: Fri, 09 Oct 2009 10:30:32 -0700
On Fri, 09 Oct 2009 09:56:28 -0700, Charlie E. <edmondson@xxxxxxxx>
wrote:
On Fri, 09 Oct 2009 18:47:53 +0200, Andrew Edge
<a_n_d_y_e_d_g_e@xxxxxxxxxxxxxx> wrote:
On Thu, 08 Oct 2009 19:38:41 GMT, nico@xxxxxxxxxxx (Nico Coesel)
wrote:
The loudspeakers each have an amplifier incorporated I repeat ... and
each one of these amplifiers absorbs 25W, though the data sheet says
the maximum value is 40W. The input voltage to each loudspeaker is 24
to 48Vdc but looking at the loudspeakers specs I prefer using 48V as
You've got to be joking...
I can't use a single amplifier because with the number of speakers
we're dealing with it would need more then a 1000W speaker with huge
distances involved its complicated. The source is an intercom system
so at a first estimate 0.6mm telephone wire should suffice.
Sorry, but the only way to do this right is using 100V speakers which
are fed by several amplifiers at strategic places. There is no sense
in designing such a system. It is already available as an off-the
shelf product. Go ask at the local football stadium or an amusement
park. They deal with long distances as well. Besides, I don't know if
you want to design a safety critical system. I'd see if I can buy such
a system so I can blame someone else if things go wrong.
I make a living designing these things ... so just answer my question
if you can ... same goes to Tuddenham and Herbert.
Thanks to Joerg and Vladimir for their constructive comments.
Martin
Martin,
Are you saying that you design PA systems for a living? Or industrial
systems for a living? And, are you an electronic designer? Or
mechanical? I have to ask because your question is so basic, and
wrong, that I suspect that you have little to no electronic or
electrical experience, unless it is in a field such as digital design
or software where practical problems are far from reality.
As to the answer to your question, it is quite simple. Where are
these units located. What is the spacing? Is power available at each
location? If they are relatively close, you get one really beefy
power supply, and run a cable from there to the units in parallel. If
they are far apart, then you buy smaller power supplies, and put one
at each unit. If some are far, and some are near to each other, you
use a separate power supply for each area. You also get to find out
what a ground loop eliminator is... ;-)
In other words, your question is meaningless. There is not enough
information to give a reasonable answer, and it seems that most of the
assumptions you have are wrong.
Charlie
Here's how it will look...
http://www.analog-innovations.com/SED/Andrew_Edge_PA_System.jpg
...Jim Thompson
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We right-wing conservatives go so far out of our way to be polite
that we couldn't possibly deign to use such words as "ignorant" or
"yellow-belly" or "wuss". Instead, to keep everything warm and
fuzzy, we substitute the politically-correct synonyms "leftist
weenie" or "liberal" or "Democrat" ;-)
.
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