It might be helpful to others if you provided links to all the Clarion marine manuals, not just the head units. There is likely to be interest related to the amplifier controls.
for example here is the link to the APX 400.4M
http://www.teamclarion.com/sharedwebdbs/ClarionSupport.nsf/b519d112bdcca8b588256a630071fab1/e469e62058003a2f88256e43006d52b3/$FILE/APX400.4M%20(OWNERS%20AND%20INSTALL).pdf
The others are there too.
Mikeski
for example here is the link to the APX 400.4M
http://www.teamclarion.com/sharedwebdbs/ClarionSupport.nsf/b519d112bdcca8b588256a630071fab1/e469e62058003a2f88256e43006d52b3/$FILE/APX400.4M%20(OWNERS%20AND%20INSTALL).pdf
The others are there too.
Mikeski
Comment