I find the most pleasing sound in my car is with the bass & treble set to flat and the loudness on the first setting. That gives the most natural reproduction (in my cars, anyway). Sounds like you got your just where you want it. Just listen for distortion. Sometimes it's hard to tell if a speaker is distorting or a piece of the trunk/deck/etc... is vibrating and making noise. I had a foam surround disintegrate on an MTX box once and it sounded just like a rattle I had been fighting in the hatch in my Mustang. It didn't occur to me that it was the voice coil dragging until I saw the damaged surround. Needless to say, I took it out to glue in a new surround right away.

Anyhow, just listen for distortion and you'll be fine!

Chris

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)