Leo a écrit :

This is from Canadian PA systems maker Yorkville.

first one is basic with easy words written (not too technical)

http://www.yorkville.com/downloads/other/pabasics.pdf
http://www.yorkville.com/downloads/other/paguide.pdf

I recommend to read at least  "pabasics.pdf"

Leo

Really good
 

THANKS FROM pARIS
tEZA