| Not a stupid question at all, but i don't see why it matters though.
Technically a humbucker is a pickup made up of two coils, to cancel out 60Hz hum.
So yes, a split-coil P bass pickup is a humbucker.
However, most people think of a humbucker as sensing the string vibration from two single coil pickups mounted close together in the same housing.
A split-coil pickup, though it's made of two coils, only senses string vibration from one coil at a time. |