This is from Canadian PA systems maker Yorkville.<br><br>first one is basic with easy words written (not too technical)<br><br><a href="http://www.yorkville.com/downloads/other/pabasics.pdf">http://www.yorkville.com/downloads/other/pabasics.pdf</a><br>
<a href="http://www.yorkville.com/downloads/other/paguide.pdf">http://www.yorkville.com/downloads/other/paguide.pdf</a><br><br>I recommend to read at least  &quot;pabasics.pdf&quot;<br><br>Leo<br>