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Re: STR-DE998 Receiver and JBL scs300.7 speaker system
A.F.D means Auto Format Decode and will generally be preset for correct speaker use. The other modes are customizable (AFD usually is also) and may not be set for the speaker setup that you have.
Some modes are specifically designed for reproducing sound when some speakers are not present (no center speaker, no rears, no subwoofer, etc).
I have found that you need to pull out the manual, start at page one, and go through it page by page. If you try to skip ahead, you'll probably miss something.
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