
RMS stands for "Root Mean Square", which is fancy mathematical formula for finding the average amount of power an amplifier can continuously produce. There is no legal standard for calculating RMS watts for an amplifier. Most amplifier makers get a "UL" Rating from the Underwriters Labratories to obtain the most 'true' RMS rating.
Since most amps sound their best when they are 'cranked', some musicians look at the Peak wattage more than the RMS rating. Also, tube-amplifiers are usually not rated by RMS.
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