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The Pro subs also can utilize jumper settings rather than wiring each
coil individually as the above diagrams show.
By default the jumpers come in the top two spots. This would keep
each of the coils separate just as a regular dual voice coil woofer
operates. All of the above diagrams would work fine when the
jumpers are in this position.
With the jumpers in the bottom two it would wire the coils in parallel,
giving you a two ohm final load. You would only need to use one set
of terminals when using the jumpers. The diagram would look like
this.