Professional audio and KTV tuning must-read knowledge!Audio for bars direct sales

　　1. What is the withstand power of the speaker?

　　As the name implies, the withstand power of the speaker means "the input speaker will not be damaged if it does not exceed the indicated power, and it can withstand it".

　　There are several ways to express the withstand power of speakers, which can easily cause misunderstandings by users, and cause damage to speakers due to improper use. Some of the parameters of the speaker are marked with rated power, that is, long-term power, which means that long-term use will not be damaged under this power state. The factory test rated power is under the condition of constant temperature of 20 ℃ and continuous operation with pink noise signal for 48 hours. The use environment in the KTV private room is relatively harsh, and the music contains many large dynamic peak signals. It is recommended that the input power be lower than 20% of the rated power to use speakers, which will be much safer. Some speaker parameters are marked with the peak power, which is 3-4 times the rated power. For example, the power of the BMB brand CS-450MKII is marked with a peak power of 450W. The speaker's ability to withstand peak power is subject to conditions. The time setting is 1 second, and the repetition can only be repeated 10 times. If it exceeds, it may be damaged. Use special care for speakers marked with peak power. It is recommended that the power not exceed the peak value. 1/4 of the power.

　　2. What is the rated output power of the amplifier?

　　The rated output power of the power amplifier refers to: "long-term output power under the condition of no distortion (generally means that the output distortion does not exceed 1%)", and the power amplifier works safely and reliably in this state. In fact, there are several prerequisites here: one is that the mains voltage is required to be a standard 220V. If the mains voltage fluctuates, the output power of the power amplifier will also change; the other is that there are impedance regulations for the load (speaker), such as 2 *150W (8Ω) power amplifier, the output power may reach about 230W under the condition of 4Ω load. The ambient temperature of the third factory during the output power test of the power amplifier is 20°C. If the heat dissipation is not good when used in a KTV private room, even if it works under the rated power condition, it may damage the power amplifier. The rated power of the four power amplifiers It refers to the undistorted output power. It does not mean that the power amplifier can only output this power. If the power is distorted and the output is increased (increase the volume knob), the output distortion power is very large, far exceeding the rated power. For example, the maximum output voltage of a 150W (8Ω) amplifier without distortion should be less than 35V (power = voltage 2/resistance). When distortion occurs, the output voltage may rise to 40V, and the distortion power at this time will reach 402/ 8=200W.

　　3. How to match the power when choosing the power amplifier and speakers?

　　When choosing a power amplifier and a speaker, we recommend that the rated power of the power amplifier should be slightly larger than the rated power of the speaker. Generally, 20-30% of the size is appropriate, and Z should be at least equal. The rated power of the power amplifier must not be less than the rated power of the speaker, forming a "small horse". cart". A small horse-drawn cart will cause the whole system to have a weak bass performance, and the dynamics and music performance will become worse. If the user increases the bass pitch knob or volume knob too much, it will cause amplifier output distortion, that is, the internal Pedestrians often say "clipping", resulting in direct current output (under normal circumstances, the output waveform of the power amplifier is an alternating current sine wave, and after distortion, it will "clip" to form an approximate direct current). In the case of DC output, the power amplifier can no longer control the speaker, and there is no doubt that it will burn. When the power of the power amplifier is greater than the power of the speaker, it is necessary to control the output of the power amplifier not to be too large, so as to ensure that the power amplifier has enough "power reserve", good dynamic performance, and will not damage the speaker.

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