Power standards (DIN,RMS,PMPO). Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Power standards (DIN, RMS, PMPO). Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Speakers

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The variety of standards used to measure the output power of amplifiers and speaker power can confuse anyone. Here is a block amplifier from a reputable company with 35 watts per channel, but here is a cheap music center with a 1000 watt sticker. Such a comparison will cause obvious bewilderment in a potential buyer. It's time for the standards...

In Russia, two power parameters are used - nominal and sinusoidal. This is reflected in the names of the acoustic systems and the designations of the speakers. Moreover, if earlier the rated power was mainly used, now it is more often sinusoidal. For example, the 35AC speakers were subsequently designated S-90 (35W nominal power, 90W sine wave power)

Rated power - power at the middle position of the amplifier volume control, at which the remaining parameters of the device correspond to those stated in the technical description.

Sinusoidal power is the power at which an amplifier or speaker can operate for a long time with a real music signal without physical damage. Usually 2 - 3 times higher than the nominal value.

Western standards are broader, generally used DIN, RMS and PMPO.

DIN - roughly corresponds to sinusoidal power - the power at which an amplifier or speaker can operate for a long time with a "pink noise" signal without physical damage.

RMS (Rated Maxmum Sinusoidal) - The maximum (limiting) sinusoidal power - the power at which an amplifier or speaker can operate for one hour with a real music signal without physical damage. Typically 20 to 25 percent higher than DIN.

PMPO (Peek Music Power Output) - Musical power (outrageous :-)) - the power that the speaker speaker can withstand for 1-2 seconds on a low frequency signal (about 200 Hz) without physical damage. Usually 10 - 20 times higher than DIN.

As a rule, serious Western manufacturers indicate the power of their products in DIN, and manufacturers of cheap music centers and computer speakers in PMPO.

Power standards (DIN, RMS, PMPO)

100 W (PMPO) = 2 x 3 W (DIN)

Don't forget about speaker impedance. Mostly on the market there are speakers with a resistance of 4, 6, 8 ohms, less common are 2 and 16 ohms. The power of the amplifier will vary when you connect speakers of different impedance. The instructions for the amplifier usually indicate what speaker impedance it is designed for, or power for various speaker impedances. If the amplifier allows operation with speakers of different impedance, then its power increases with decreasing resistance. If you use speakers with a resistance lower than that specified for the amplifier, this may cause it to overheat and fail, if higher, then the specified output power will not be reached. Of course, the volume of acoustics is affected not only by the output power of the amplifier, but also by the sensitivity of the speakers, but more on that next time. The main thing is not to forget that power is only one of the parameters, far from the most important for getting good sound.

Author: Dmitry Khraltsov; Publication: DVDWORLD.RU

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