I don't get to play my Alembics very much these days because my bandmates prefer the tone of my lesser instruments. Not sure why.
There are many things about your bass that have an impact on tone. Things like the neck through construction and the strings you use are critical to the tone achieved.
As far as maple goes, I know from baseball bats that maple can vary a bit in grain and density. If your bass is on the heavy side, then you probably have some pretty dense maple. I have a Peavey neck-through that is an extremely heavy slab of maple that has bottom for days, maybe even weeks. Wood is really just a filter. When combined with the construction methods, your bass will have a particular resonance response across the frequency spectrum. A bright sounding bass doesn't boost the higher frequencies as much as it absorbs the bassier energy. This allows the higher frequencies to ring out and what you get through the pickups is a relatively bright tone. Gluing together different types and grains of woods can stiffen the overall product to reduce some of the absorption as well.
Neck woods are key to tone. One of my two has purpleheart in the neck, the other one has that as well as ebony. Both have tremendous low end response, especially compared to other Alembics I had owned with only maple in the neck. One of these days I'm going to have to get my hands on a set of regular AXYs, or at least a neck pickup, to see if I can be allowed to play my babies in the band context again. I think the FatBoy pickups add a bit too much meat to the tone that put it over the top for my band.
In any case, the purpleheart in your neck, the tight glue joints, and maybe a dense piece of maple combine to limit the absorption of low frequencies by your bass, so that meaty full tone is what is ringing out for the pickups to capture and the filters to mold.