The best replacement for 4 ohm amp is 2 ohm.

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

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Speaking about 4 ohm amp, one probably shouldn't forget about 8 ohm speakers.

Other search terms related to 4 ohm amp and their ratings are:
★★★★★ 8 ohm speakers
★★★★★ 6 ohm speakers
★★★★ 2 ohm sub
★★★★ 2 ohm speakers
★★★ 8 ohm sub
★★★ 3 ohm speakers
★★ 8 ohm speaker
★ 2 ohm speaker
★ 4 ohm sub
★ 16 ohm speaker
★ 8 ohm cabinet
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4 ohm amp
2 ohm