Your best bet would be to get a dual voice coil sub (DVC) with 2 4ohm coils. Wire them in parallel and you will get your 2 ohm Load.
Or you could also buy two 4 ohm(SVC) subs, wire them in parallel to get your 2 ohm load.
Pretty sure JL have a dual 4 ohm series, but it's a pretty common thing anyway.
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