Well, I personally don't "do" Sound Power stuff and this is the only reference I can find -

http://www.jblproservice.com/pdf/Sys...20P-Series.pdf

http://www.jblproservice.com/pdf/Sou...eries/P749.pdf

http://www.jblproservice.com/pdf/Sou...eries/P798.pdf

http://www.jblproservice.com/navigat...0P-Series.html

so...