I had that same problem in my Volvo. The stock radio/speakers had so much bass that I turned it down from midline. The empeg playing through those speakers didn't have the bass except when it hit those "sweet spots" in the low range. Must be tweaking.
It's not terrible, as I've been dealing with it for over 3 years (wow!). I can only hope a set of carefully selected speakers, AutoEQ, and Brad's instructions will make it sound better.
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens,
Greenlights Lit Buttons green set