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National standards and international standards of speaker power
Speaker of power is the most important indicator speaker. In the design of audio systems engineering, decision power string matching and speaker (speaker system) Design speaker and amplifier between such processes, the Department must clearly know and understand the speaker's power string values and their meanings. At present, different equipment manufacturers in the country Yang Sheng brand power of the underlying value, its meaning varies to live, so live a great value stay for access.
China in recent years has developed a unified international speaker power (GB9396-88), essentially using the method of the International Electrotechnical Commission (IEC) as drafted. However, some foreign brands such as the United States JBL and EV, still their own special criteria were used. GB This article will power the speaker and part international standards are to make a profile.
Over a long period of time of each manufacturer Yang Sheng Yang Sheng input power use the "standard power" has a value, in this power provides harmonic distortion is fed to the speakers at a constant voltage standard power test nonlinear distortion factor measured shall not exceed a predetermined value for a given speaker. Because the standard power is determined by the size of the distortion value, the distortion value can not exceed certain requirements, so the standard power is set relatively small, usually less than other types of power. Long-term exposure standard power readers will feel no wonder Sri Lanka marked homemade speaker power handling is much lower than foreign speakers.
In order to eliminate the speakers on the definition of different types of power in the chaos, the International Electrotechnical Commission (International Electrotechnical Commission, Acronym IEC) presented the "electro-acoustic devices Speakers" standard, to be presented to all countries unanimously adopted the following categories Speaker power: Max noise power (rated noise power), the maximum sinusoidal power, long-term power (rated long-term maximum power) and short-term power, these distortion power indicators are irrelevant, respectively, are briefly introduced:
(1) Rated noise power (Rated Noise Power): It is defined as: continuous to the speaker input analog noise signal (pink noise through the filter and limiter signal after band-pass), within 100 hours of continuous work without overheating and mechanical damage This power is called the speaker's rated noise power. The size of the power value has nothing to do with the distortion, it is usually a nominal power than the previous 1.5 ~ 3 times. At present domestic and foreign manufacturers of speaker, mark on the nameplate of the most common is the power. When people design and matching speakers with the amplifier sound system also used this power. Rated noise power as well as other names, such as maximum noise power (Maximum Noise Power), continuous pink noise power (Continuous Pink Noise Power) or simply continuous power, noise, power, etc., its meaning is the same.
(2) Rated maximum sinusoidal power (Maximum Sinusoidal power), also known as continuous sine wave power (Continuous Sine Wave Power) or root mean square (RMS) of power: It is a given continuous sine into a single frequency band signals into a continuous sinusoidal signal within a single frequency, continuous work one hour, at this power speaker voice coil vibration should not have backing sound, the speakers are not overheating and mechanical damage. Since the power is not given nonlinear distortion limitations, so the power is higher than the standard power
(3) long-term power (Long-Term Power, also known as long-term maximum rated power): This is given special provisions in the band A noise signal power. Speaker withstand this power does not cause permanent mechanical damage within one minute (every two minutes interval test repeated 10 times). The power but also a lot of noise is greater than the rated power mentioned earlier. Such as standard power Guoguang Ah D200-6 speaker of 5W, and long-term rated power of 30W.
(4) Short-term Power (Short-Term Power, also known as the short-term maximum rated power): it is a special noise power, and to determine the type of this noise signal is similar to the maximum noise power, which is defined as the work of a second speaker, Stop 60 minutes, repeated 60 times. Without causing permanent mechanical damage when subjected to this power process. The power is all named power maximum bid value. Usually larger than the nominal power of 8-10 times. Some manufacturers call it the peak power (Peak Power). In addition to the far IEC standards, in engineering practice will encounter music power, power program and EIA (Electronic Industries Association) standard, AES (Audio Engineering Society USA) standard even the manufacturers own criteria, etc., the following were Introduction .
(5) Music Power (Music Power), also known as power program (Program Power): depending on the make Yang Sheng 250HZ the ability to withstand short-term sinusoidal signal, it sounds no obvious distortion, no permanent mechanical damage. This power value into account both distortion values generated by the speaker, but also consider the value of a permanent mechanical damage speakers, is the German standard DIN employed.
(6) EIA RS-426 standard: American Electronics Industry Association (Electronic Industries AssoCiatio, Acronym EIA), the EIA RS-4264 standard provides, will test a special noise signal is applied to the spectral distribution of the noise signal Yang Sheng is more close to the actual program signal, and to last as long as eight hours on the speaker, the speaker also required to withstand the test noise power four times higher than that of transient peaks. Obviously, the mechanical structure and thermal properties of this speaker is very strict test. Such testing may be lower than the value obtained using the sine law resulting value, but the value of the power amplifier Click to cooperate is not easy to destroy the speaker system. United States EV company's products on the use of EIARS-426 as a standard method of testing the speaker power handling capability, and it can withstand eight hours of power known as "long-time average power", or "noise power" and the 4 on the power The power is called "instantaneous power."
(7) AES standard: Standard American Audio Engineering Society (Audio Englneering SoCiety, Acronym AES) regulations, the pink noise (see Note) as the test signal is applied to a speaker, two hours of continuous work without overheating or mechanical damage, the Power called "rated power input (AES)" or "continuous pink noise power (AES)". Famous American speaker manufacturer JBL is the adoption of AES standard.
Note: "White Noise" and "Pink Noise" is a kind of random noise, a continuous noise spectrum. "White" and "pink" these two words mean noise spectrum, it borrowed from spectroscopy. White noise contains various frequency noise, and the energy distribution is uniform, except pink noise and white noise is that its power spectrum density is inversely proportional to frequency. In logarithmic coordinates, the output is a horizontal straight line; linear coordinates, the output drops to 3dB per octave. That pink noise frequency component to be rich than white noise.