As far as I know, the only true onboard filter preamps are made by Alembic and John East. I dont need to attest to the quality of John Easts products. This one is the two pickup version with two filter stacks and active blend. It therefore is a 4 knob system, comes with black knobs. You can however, use less of the system for a single pickup for example, so you wont need to route (just unplug the solderless parts of the system you might not need).
I shall post photos this weekend. Bought locally from TBer but I never got around to installing.
Bestbassgear link
http://www.bestbassgear.com/acg-eq-02-two-pu.htm
Here is a link to the John East site
http://www.acguitars.co.uk/shop/inde...od&productId=6
Bestbassgear sells for $360+shipping. Can be had from me for $250 shipped.