Bass fabrication discussions don't often take into consideration the solid construction techniques that Carvin utilizes. Focusing solely on the wood and its placement and finish are only a portion of the requirements of a superior design. Somehow, it's a common perception that skillfully constructing a a bass with tight, well aligned grain is all that is necessary to bring out the best tone. Carvin itself seems to fall prey to this line of reasoning. They are masters at guitar design and construction, yet their instruments don't seem to capture the body of sound necessary to compete with other established standards.
Actually, this is one of the great things about the Carvin - it _doesn't_ follow the established standards of tone (by that I assume something like the Fender style tone where there's a large acoustic contribution) and for that I'm hugely grateful.
In fact, the best kept secret of a design like the Carvin neck-through is the _lack_ of acoustic contribution. With many other designs, like the Fender style basses, you can't get _rid_ of that contribution if you need to. This is a joy when it comes to recording, for instance. You're not fighting some inherent tone from the start and you can achieve pretty much whatever you want electronically.
My Bunny is the most versatile sounding bass I think I've ever played because of that. It also so happens that, when left alone, it's got the best tone for sitting in a mix of anything else I've used.
With my other basses I'm stuck with some kind of character to their tone whether I like it or not. Or at least, I don't have that expensive of a rack of electronics to try to get rid of it.
I like what the other poster said about whether it "feels like a good pair of jeans." If so, I'd swap out the pups in a heartbeat. My Carvin is always a show stopper in design and construction - wish it had the tone to keep up.
It probably already does, or it did until you hacked it by replacing the PU's

.
I don't think Carvin came up with their design willy-nilly at all. The acoustic "deadness" of their neck-throughs is almost certainly intentional in order to get a what I'd call "neutral" tone to start with. From there, you can do whatever you want electronically. I.e. My BB76F cops a nearly perfect P bass sound with just the neck PU only.
And FWIW, they're filling out their line with more traditionally constructed basses like the SB and B series for those who want a more traditional tone.
But their neck-throughs are as good as you can do for the money, IMO.
LS