RMS
RMS Root Mean Square. A measure of voltage or (incorrectly) power output. The latter is often quoted in the specifications for an amplifier or home theatre receiver. Measuring voltage is simple with direct current, even if it varies in level. You can simply average the values over time. But alternating current, when arithmetically averaged, gives you a value of zero or close to zero. If you square each value (multiply it by itself) before taking the average, and then take the square root of that average, you not only get a reasonable representation of the voltage, but a value that provides effectively the same amount of power as a similar DC voltage into a resistive load. What is called 'RMS power output' for amplifiers is calculated using the RMS voltage delivered by the amplifier to test loads, so in that sense the term is not entirely misleading (however something like 'average sine wave power output' is far less irritating). Such figures should include a measure for the amount of distortion generated at that power. This should be well under 0.5%. If the figure is 10% (often used with home entertainment systems) the figure should be discounted substantially.
Source: http://www.astintrew.co.uk/support/The%20Astin%20Trew%20Dictionary%20of%20Hi-Fi%20Terms%202008.pdf
Web site to visit: http://www.astintrew.co.uk
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