The best replacement for 4 ohm sub is 2 ohm.

The best alternatives to 4 ohm sub are rated as following:
★★★★★  2 ohm
★★  8 ohm sub
★★  2 ohm sub

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Speaking about 4 ohm sub, one probably shouldn't forget about 2 ohm amp.

Other search terms related to 4 ohm sub and their ratings are:
★★★★★ 2 ohm amp
★★ 8 ohm amp
★ 1 ohm amp
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4 ohm sub
2 ohm
8 ohm sub