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I think the OP means that people will refer to the sub getting say 30 volts from the amp. This then translates into watts, and can be check with a resistor on the lead from the amp thats the same impedence as your sub. Or something along these lines..... i have been looking for more info on this as well. People use this to see what their amp is actually putting to the sub, and could be very usefull if someone on here know more about how to do this properly.
I believe you run sine wave or pinknoise, turn the amp to clipping and back down. remove the sub from the wire and attatch the resistor. Then check the voltage at the resistor with the amp playing pink noise (or sine wave) at the same volume you had right below clipping. Then the voltage you get can be changed to volts....
Is this correct or am i missing something?
 
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