Some questions about the power of the latter stage

[Home Theater Network] POWER, energy, in the audio generally refers to the output power, that is, the power consumption level (generally referred to as the rear stage) output provides electronically measured functional consumption. The unit it uses is Watt Watt, abbreviated W, which is composed of the product of the voltage and current of the output. The magnitude of the voltage is determined by the amplifier's output and output limits as a function of the amplitude of the music. The current must be determined by the impedance of the load (that is, the load impedance of the horn). Most of them are currently marked with 8Ω. If there is no load, the measured power will be zero.

For example, with a load impedance of 8Ω connected to a power amplifier that can provide a 28.8V undistorted output voltage, it has a power output of 100 watts. If it is connected with a 4Ω load (such as adding a pair of speakers in parallel) In theory, it will become a power output of 200 watts, but at this time, the performance of the power amplifier must be considered, whether it can provide twice the current output. If not, it will not provide sufficient power output, and it may also cause a power amplifier. The temperature is greatly increased and it is more likely to burn it.

In fact, to understand the output performance of the power amplifier, it is best to separate the power to understand, first, how high it can provide undistorted voltage output? Second, how much current output can be provided at the same time? The problem is that the power amplifier is in use. The reason for the component and circuit design or cost cannot provide an unrestricted current output, so generally the better the power amplifier with lower load, the better the performance.

In addition, it is the specification of the specification. Generally speaking, it is based on the 8Ω load, for example, 100 watts RMS (root mean square value), which represents the real value of the power, the instantaneous peak power, (Peak Power), or Two channels or even four channels add up to indicate. I think these are all things to be aware of.

Maybe you will ask: How much power output should I use properly? I think this is divided into two aspects: in terms of general household speakers, it can be said that most of them are inefficient, for example, efficiency. When the speaker of 82 db is input with 1 watt of power, the sound pressure of 82 db can be measured 1 meter in front of the horn. The noise level in front of the Beijing West Railway Station is red when the red light is on, the ambient noise is 76 db. If we listen to music at home, usually between one and two watts, then why don't we use a two-watt amplifier? Because in fact, it is often possible to reach one or two under a certain section or a relatively strong bass. Ten times the power output; then it is to consider the power of the speaker, but it is not the speaker to bear the 50 watt power amplifier, more large will not cause problems. Some horn manufacturers will recommend using more than watts of power amplifiers to push, but to expand the machine itself, the sound quality, and the ability to provide current is the reference we choose, when it comes to the speaker performance issues Generally speaking, it is mainly marked by 8Ω, but in fact it will have different load impedances in different frequency bands, often in the middle and high frequency bands or a case value impedance will be as high as 50Ω, and in the lower frequency band, some will be as low as A 2Ω load, which may cause some power amplifiers to be inoperable and unable to make a sound.

Speaking of this, I think you probably have a preliminary understanding of Power. Of course, it still has a deep discussion, but basically understand that this level is not far from the experts, more home theater knowledge, WeChat: cnhifi.