Sine Wave Power
The term sine power is used in the specification and measurement of audio power. A meaningful and reliable measure of the maximum power output of an audio amplifier – or the power handling of a loudspeaker – is continuous average sine wave power. The peak power of a sine wave of RMS value X is √2*X; conversely, the RMS value of a sine wave of peak X is (1/√2)*X. For a resistive load, the average power is the product of the RMS current and RMS voltage.
Harmonic distortion increases with power output; the maximum continuous power output of an amplifier is always stated at a given percentage of distortion, say 1% THD+N at 1 kHz. Considerably more power can be delivered if distortion is allowed to increase; some manufacturers quote maximum power at a higher distortion, like 10%, making their equipment appear more powerful than if measured at an acceptable distortion level.
In the US on May 3, 1974, the Amplifier Rule CFR 16 Part 432 (39 FR 15387) was instated by the Federal Trade Commission (FTC) requiring audio power and distortion ratings for home entertainment equipment to be measured in a defined manner with power stated in RMS terms. (See more in the section Standards at the end of this article). The erroneous term "watts RMS" is actually used in CE regulations.
Read more about this topic: Audio Power
Famous quotes containing the words sine, wave and/or power:
“Hamm as stated, and Clov as stated, together as stated, nec tecum nec sine te, in such a place, and in such a world, that’s all I can manage, more than I could.”
—Samuel Beckett (1906–1989)
“Through this broad street, restless ever,
Ebbs and flows a human tide,
Wave on wave a living river;
Wealth and fashion side by side;
Toiler, idler, slave and master, in the same quick current glide.”
—John Greenleaf Whittier (1807–1892)
“He will deliver you from six troubles; in seven no harm shall touch you. In famine he will redeem you from death, and in war from the power of the sword. You shall be hidden from the scourge of the tongue, and shall not fear destruction when it comes. At destruction and famine you shall laugh, and shall not fear the wild animals of the earth. For you shall be in league with the stones of the field, and the wild animals shall be at peace with you.”
—Bible: Hebrew, Job 5:19-23.