The amp can make 300 watts into 4 ohms.

The power formula is Power = Resistance x current(squared).

So if 300 watts, divide by 4 (if that is the impedance of the speaker) and the result is 8.66Amps.

You may see much higher current ratings advertised by the manufacturer. None of this current will be used to drive the speaker- those numbers (like 80 amps for example) are how much current is present when the power supply of the amp is shorted out for 10 milliseconds. Its a rating of the power supply not the output section of the amp.

more:

http://www.atma-sphere.com/Resources/Common_Amplifier_Myths.php

The power formula is Power = Resistance x current(squared).

So if 300 watts, divide by 4 (if that is the impedance of the speaker) and the result is 8.66Amps.

You may see much higher current ratings advertised by the manufacturer. None of this current will be used to drive the speaker- those numbers (like 80 amps for example) are how much current is present when the power supply of the amp is shorted out for 10 milliseconds. Its a rating of the power supply not the output section of the amp.

more:

http://www.atma-sphere.com/Resources/Common_Amplifier_Myths.php