What size wire for a 2600 watt amp?

For a 2600-watt amplifier, the appropriate wire size depends on the voltage and the length of the wire run. Generally, for a 12-volt system, you would use at least 4 AWG wire for runs up to 10 feet, and 2 AWG for longer distances. Always consider the ampacity and potential voltage drop, and consult wire gauge charts for specific applications to ensure safety and performance.