Hi Shoji,
The official build card shows:
top and back: Schedua
body: Cherry
neck: Maple, Beech, Purpleheart
scale: long 34
fingerboard: Ebony
inlays: mother of pearl
peghead veneers: Vermilion
birthday: June 23, 1977
originally made for: Rothchild
The dark tone is probably due to the combination of the Cherry core (my bass has this) and the Schedua top and back, which really emphasizes the lows.