On a car stereo, what function ...?

almost all sound quality car stereo builders and trophy winners only use front speakers for a front sound stage.

you just barely want to hear the rear speakers for fill. btw you're name is one of the prettiest names there is. 8) reminds me of the song they sang on titanic.
 
Use the Fade option this will give you the option to adjust the front and rear speakers, the display will appear as follows, F1-R1
 
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