but howso? What should I set the multimeter to? Do I need a sub connected to it, or can I put the leads directly onto the amp with it powered on? Should I have an input connected to the amp with music on?
you'll need to have a signal going through the amp, so have music playing. The higher the volume the higher the current. put the positive end of the multimeter in the positive speaker terminal and the negative in the negative.
R.I.P Blue '02 '08 - 5.3
Vette Servo, Flowmaster 40