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.
I have the "I" version ... which did not have a sub out (they really weren't used much in 1989). Check Adcom's website as they have downloadable user manuals.
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