RMS is an acronym for “root mean square.” In terms of audio reproduction, RMS indicates the average power output of aloudspeaker. A speaker’s RMS output is measured in watts and is typically listed both on the speaker’s packaging and within the speaker’s documentation. The higher the RMS wattage, the more powerful the speaker. If you aren’t sure of a speaker’s RMS wattage or want to verify a claim made by a manufacturer, you can determine RMS wattage yourself. Guidelines 1.Determine the voltage in the speaker. Examine the speaker itself, talk to the speaker??s specification sheet or make use of a voltmeter to evaluate voltage on the speaker. 2.Determine the amperage of your speaker. Such as voltage, you??ll find the amperage detailed to the speaker alone or about the speaker??s specification sheet. You may as well utilize a multimeter to measure amperage within the speaker. 3.Multiply the speaker??s voltage by its amperage. That figure could be the speaker??s RMS wattage.