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Best Answer: d: deci, 10 to the negative first power, or one tenth. c: centi, 10 to the negative second power, or one hundredth. f: femto, 10 to the negative fifteenth power. m: milli, 10 to the negative third power, or one thousandth. k: kilo, 10 to the third power or one thousand. n: nano, 10 to the negative ninth power, or one billionth.
Â· just now. Report Abuse. It stands for root mean square, when it is referenced to car audio it means that it is the amount of power an amp can produce constantly, or a speaker can handle. This is what you should look for, not peak power. http://en.wikipedia.org/wiki/Root_mean_s...Larry B Â· 8 years ago. Thumbs up.oot means square, in other words it means the amount of watts the speaker/sub should be getting. Max means nothing really. Always go by total RMS. If you have 2 subwoofer at 500rms each and you wanted an amp for them, add all the speakers rms up in which this case it 1000rms and then find an amp.