November 2007
Intermediate to advanced
736 pages
46h 32m
English
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PLANNING A PUBLIC ADDRESS SYSTEM
As a general rule, planning of a PA system starts with :
- calculation of the area to be served,
- estimation of the required audio power,
- choice of the types of speakers to be utilised, and
- estimating the approximate number of speakers.
As an illustration, most office areas can be served satisfactorily with 8 inch cone speakers rated at 1/2 watt each. Ceiling speakers are installed about 25 feet apart. Warehouses or meeting halls often require 5 watt speakers mounted from 25 to 50 feet apart. When noise is troublesome, 5 watt indoor horn speakers may be installed at necessary locations to maintain a satisfactory audio to noise ratio. Speakers serving spectator groups in outdoor installations should be placed near ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.