I was looking at really cheap pickups - I'm thinking about using one as a soundhole pickup in an acoustic guitar. Wanting to avoid noise, I thought I'd try some kind of humbucking pickup. Wanting to keep things small, I thought I'd avoid a full-sized humbucker. So... Are those single-coil-sized dual rail pickups actually humbuckers? If so, how do they compare to a normal mini-bucker? For this application (soundhole pickup for an acoustic), which would be better?