From: John Woodgate
Subject: Re: PA (Public Address) Systems
Date: Sat, 7 Dec 2002 18:36:19 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Sat, 7 Dec 2002 18:42:38 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that George Shaw
wrote (in ) about 'PA
(Public Address) Systems', on Sat, 7 Dec 2002:
>Question: Are there any good resources to find out how PA systems are
>designed and how they work?
See my .sig. Unfortunately the web site is broken at present, but you
can still apply for membership by contacting me! (;-) The Reply To
address of this post is not munged.
>I need a source to provide basic information such as speakers, why
>100V, impedance explained, amplifiers, transformers and line drivers.
>As well as the more advanced topics of acoustics and environment
>Web sites, books and sources or explanations would be of value.
Well, not the web site, today. Claranet has locked it while I was
updating it, and won't unlock it despite daily protests. (Yes, we have
pais the invoice!)
>Any calculations and formula would be of value.
All of those.
>Any ideas of suggestions as to how a simple PA system comprising of a
>microphone, amplifier, 16 ceiling mount speakers and a two wire cable
>system could be specified and designed for optimum audio in an office
>environment would be a good example. Block diagrams or
Not a task for a beginner, I can assure you. Office systems have to be
very carefully set up so as not to offend the inmates^H^H^H^H^H^H^H
employees. If you get the positions of the loudspeakers wrong, you may
have to buy a new ceiling.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
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