JUST got polk backs,have 2fronts and sub...When i run mac. i get the test tones from my 2 fronts and sub, but NO test tones from my backs?

But when mac. is completed testing i do have test readings on my backs on my menu. STRANGE, any ideas or answers,would be helpful,THANKS,..iAM NEW TO 5.1,.PLEASE HELP,..can look at links,..4481 and 4482 for more info and readings


,..PLEASE GIVE DETAIL IF POSSIBLE

thanks again