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→Stacked Humbuckers
===Stacked Humbuckers===
Also, appearances can be decieving. Most humbuckers have two clearly visible coils or are cased but clearly wider than a single-coil. However, some pickups look nearly identical to single coils but are actually humbuckers. The two coils are stacked on top of each other, creating the appearance of a single coil. Many times the goal is to get hum-canceling, not the more nasal and higher output humbucker tone; so they are wired in parallel. Yet, this is not always the case, and you have to be careful when selecting your pickups and/or wiring them, depending on what you want.
=== Noiseless Single-Coils===
Some pickups are designed to get single-coil tone plus humbucker interference cancellation, as well as a high signal-to-noise ratio. They use two coils - one for the regular single-coil pickup and one "dummy" coil that is unaffected by the strings but still picks up the same interference, thus cancelling it out. The pickup is designed to have an impedance matching a normal single coil, thus having the same resonant peak. And using modern magnet technology and winding techniques, manufacturers can greatly improve the SNR of a single-coil pickup.
===Single-Space Humbuckers===