@RichardCranium - what kind of pickups/bass woods are you used to? Aggies, in my experience, can be slightly dark and aggresive when you dig in, but there's no way I'd call their normal operation unusable. Unless you are used to extremely bright sounding single coils in a maple body bass, I'd guess that there is a chance that the wiring might be funky. I know you said both passive and active modes had the issue, but did you try changing the battery, moving all eq knobs to center detent, etc.?
I've had the experience of getting a brand new instrument and thinking there was something wrong with it due to the stark difference in tone between the new bass and the bass I was used to. It happened when I got a bass with dual humbuckers and I was using a brighter sounding single/humbucker combo with a Nordy pre previously.