Trí chineál cumhachta cainteoirí cluasáin
There are three types of speaker power: one is the maximum allowable power, which refers to the input power that the speaker can withstand without damage in a short time; the other is the maximum instantaneous power, which refers to the power when the speaker harmonic distortion is less than a specified value. Input electric power (the distortion degree greatly exceeds the rated distortion degree of the speaker); there is also a rated power, that is, the input electric power that the speaker works for a long time without damage.
For a long time, the rated power is used in most speaker manuals to indicate its power handling capacity, and the rated power is doubled as the maximum power handling capacity of the loudspeaker. The so-called rated power is expressed by the effective value power of the continuous sine wave, which is generally called RMS (ie sine wave root mean square power). Since the difference between the peak value of the sine wave and the effective value, that is, the "peak adjustment" is only 3dB, this method completely eliminates the short-term peak signal components in the program that are 10dB higher than the average. , and double this data as the maximum withstand power.
This test just adds a 1-hour sine wave signal to the speaker, which is obviously inappropriate. The point is that the musicality and burst peak characteristics of the actual program cannot be realistically simulated. However, this method has been widely used in the past, and is still used by manufacturers today.
An important issue in loudspeaker power calculations is the power bandwidth, usually a loudspeaker system has a nominal frequency response range, such as from 50Hz-18kHz. Then, if the operating frequency of the speaker system is lower than its rated lower limit, the power it can withstand will be greatly reduced. For example, a speaker with a lower limit frequency of 60Hz and a continuous power of 200W for a long time is temporarily used as a monitor speaker for an electronic synthesizer. . Since the electronic synthesizer can produce subwoofers below 25Hz, if you do not pay attention at this time, the power of the input speaker to the power amplifier is still about 200W, the speaker may be damaged due to the excessive amplitude of the paper cone below 60Hz. .
In short, since different manufacturers have given various power calibrations for their speaker systems, and their test conditions are different, users must not just look at the values in the power column of the manual and use them blindly. Find out what the data means.
