How to connect the subwoofer?

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Attached are different ways to connect two subwoofers

Two pieces of 4 ohm elements connected in parallel form a 2 ohm load for the amplifier.

Two 4 ohm elements in parallel form a 2 ohm load

Two pieces of 2 ohm elements connected in series form a 4 ohm load for the amplifier.

Two 2 ohm elements connected in series form a 4 ohm load

Two pieces of 2 ohm elements connected in parallel form a 1 ohm load for the amplifier.

Two 4 ohm elements in parallel form a 1 ohm load

Two pieces of 2x4 ohm double-talk type elements with the voice coils connected in parallel and the elements connected in series form a 4 ohm load for the amplifier.

Two 2x4 ohm elements voice coils and elements connected in parallel form a 4 ohm load for the amplifier.

Two pieces of 2x2 ohm double-talk type elements with the voice coils connected in parallel and the elements connected in series form a 2 ohm load for the amplifier.

Two 2x2 ohm elements with the voice coils connected in parallel and the elements connected in series form a 2 ohm load for the amplifier.

Four pieces of 4 ohm elements connected in parallel form a 1 ohm load for the amplifier.

Four 4 ohm elements connected in parallel form a 1 ohm load