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What size gauge power wire do you need for a 4000 watt amp?

The size of the power wire you need for a 4000 watt amp will depend on the length of the wire run and the type of wire used. For a typical installation, you will need:

- 4 AWG power wire for runs up to 10 feet

- 2 AWG power wire for runs up to 20 feet

- 1/0 AWG power wire for runs up to 30 feet

- 2/0 AWG power wire for runs up to 40 feet

- 3/0 AWG power wire for runs up to 50 feet

If you are using OFC (Oxygen-Free Copper) wire, you can reduce the wire gauge by one size. For example, you could use 2 AWG OFC wire for a 4000 watt amp with a 20-foot wire run.

It is important to note that these are just general guidelines. The actual size of the power wire you need may vary depending on the specific amp and installation. Always consult with a qualified auto electrician before installing a high-powered audio system.

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