Microbuzzer.com · Posted on 20-07-2010 by microbuzzer

Speaker’s power is some of the specific technical conditions loudspeaker power amplifier obtained from the electric power introduced by the speaker unit electric power consumption, not the speaker sound power generated by unit. Obtained from the PA speaker in most of the energy converted into heat, only a small part is converted into sound. Sound power output of the speaker unit with its sound power output of the electric power consumed by the efficiency ratio as the speaker. The size of the speaker can withstand the power is an important indicator of the speaker unit, its unit is W.
We usually hear all kinds of language and music program signal is compounded by a variety of frequency transient signals. According to spectrum analysis, the noise signal is a continuous, irregular signal with our language and music festival since the signal is very similar to the noise signal simulation using real life language and music signals, the acoustic properties of the speaker unit test, often get more than pure-tone signals realistic use of test results. Tested to withstand the current speaker power use when most of the noise signal generator. Noise is an irregular, intermittent signal, the general test of the noise signal are two kinds of white noise and pink noise, “white” and “pink” that the two words is the noise spectrum by the two decisions. White noise is a random noise, this noise signal from 20Hz ~ 20kHz contains a variety of frequencies, and the noise signal energy were evenly distributed; pink noise is a random noise, but its frequency is inversely proportional to the energy distribution Therefore, the pink noise in the low-frequency components more. Fed by the power amplifier measurements gave the speaker a certain measured signal power, measured speaker at both ends of the square of rms input noise voltage and measured the ratio of speaker impedance shall bear the power of the speaker.

Speaker unit (speaker) to withstand the power unit

Can be broadly divided into the following categories:

(1) Rated maximum sinusoidal power

Speaker’s rated maximum power is measured sine speaker unit at rated frequency range of input voltage values of certain continuous sine wave signal, the signal continued for one hour speaker unit thermal and mechanical damage does not occur when the continuous sine wave RMS power to bear , commonly known as RMS continuous power (ie, sine wave RMS power). As the sine wave signal can not truly simulate the actual music in a variety of transient signals and the neglect of many of the actual music signal is much higher than the rms transient sinusoidal signal on the speaker of the peak. Therefore, this speaker has to bear the power of that method is rarely used.

(2) the maximum noise power

Speaker of the maximum noise power is the signal generator to a rated frequency range of the pink noise signal fed to the measured speaker unit, speaker unit under test conditions in this power after 100 hours of continuous heat and mechanical damage does not occur, Then enter the pink noise measured loudspeaker signal voltage and the square of the ratio of the measured impedance of the speaker unit speaker unit is called the maximum noise power. This means that the speaker unit under test conditions in the long-term reliable power to work. Domestic and foreign speaker unit nameplate for the majority of power.

(3) Long-term maximum power

Speaker of the long-term maximum power is the signal generator to a rated frequency range of the pink noise signal fed to the speaker unit under test, each signal continued lmin, intermediate stop 2min, repeat 10 times. Speaker unit under test conditions in this power thermal and mechanical damage does not occur, then enter the measured loudspeaker pink noise signal voltage and the square of the ratio of the measured impedance of the speaker unit speaker unit is called the long-term maximum power.

(4) short-term maximum power

Speaker of the short-term maximum power is the signal generator to a rated frequency range of the pink noise sound signal fed to the device under test module, each signal continued to 1s, the middle stop 60s, repeated 60 times. Tested speakers (speaker) units in this power does not occur under the conditions of thermal and mechanical damage, then enter the measured loudspeaker pink noise signal voltage and the square of the ratio of the measured impedance of the speaker unit speaker unit is called the greatest short-term power.

(5) Music Power

Speaker’s power is defined as the speaker unit in a short time the power input measured auditory perception people will not feel a significant distortion and permanent mechanical damage. The measured power of the speaker unit in such conditions the measured maximum power, usually rated 4 times the maximum noise power. Music power mostly used for advertising, in actual use has not much meaning.

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