Adcom Preamp...what is 'contour' button for?


This amp (555 GFP) has a 'contour' button that seems to only boost bass output. Is that its only purpose?
ronloisnet
The contour button must be depressed, if you want the high and low filters to work. If you need a user's manual, provide me with a fax number and I can fax you a copy. I have a 12 year old Adcom Tuner/Preamp.

Regards
its basically a loudness button without havivg to tell anyone you have a loudness button on your high end amp
Can anyone help??I have the same pre amp (Adcom GFP 555II) and was wondering- because I am not home to look at it- does it have sub out jacks?? thanks, Dave