Re: Stacked vs humbucker
Stacked single coil = 2 coils, one on top of another, literally stacked, hence the name stacked single coil. They look like traditional single coils, but are typically taller because you have 2 coils inside.
Single Coil Sized Humbucker = Something like the Hot Rail would be that. You take a traditional double coil side-by-side humbucker, and you squash it into the size of a single coil! They accomplish this by using the blade instead of pole pieces, and then wind thr 2 coils around each of the 2 blades, and then put a skinny bar magnet at the bottom, just like your regular humbucker.
They sound different because the placement of the coil changes the sound.