I'll preface this by saying that I don't have the SC-900; I have the SC-901. That said, I'm fairly sure that the two EQ presets are for a sedan-optimized EQ curve or a wagon-optimized EQ curve. The sedan curve should be closer to flat frequency response, whereas the wagon curve will boost bass output to compensate for the lack of rear deck speakers. I don't know which curve is which.
I also recall that many of these functions are described in your vehicle owner's manual.
Hope that helps.
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James Rothe, '99 S70 T5M, http://www.monmouth.com/~rothe/carstuff.html#Volvo
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