The collocation techniques and attentions of the amplifier and the sound box

1, pay attention to the power supply: the sound equipment should have a special power supply and standard voltage, and should be separated from the power supply of the light. With a dedicated power supply, there must be a stable and reliable power outlet. The power sequence device can be used as much as possible, though the cost is increased, but the stability and ease of use are improved. In a word, it is very important to connect the power supply of all audio equipment correctly and safely. Another thing to note is that some power devices of imported equipment will have 110V and 220V selector switches. In China, we must confirm that 220V can be connected when power is selected.

2, pay attention to the length of the signal line: in connection with the equipment, we should try to use a shorter signal line as far as possible to save cost, second to reduce line resistance and interference. Under normal conditions, the longest signal line using the balanced transmission method can reach about 300 meters, while the non balanced line can not be used for long distance transmission. Try to use the balance line to line signal amplifier, if there are multiple power system, it is best to use a sufficient amount of signal amplification from distributor signal line, no attenuation of the supply of each power amplifier used alone, it can reduce system noise, reduce the risk and improve the signal-to-noise ratio.

3, the quality of the speaker line: try to use the relatively thick and short full copper special speaker line. When connecting, we must also pay attention to distinguish the positive and negative poles and avoid short circuits, especially the plugs of professional four cores or four core speakers. The number of the wiring terminals is very small, so we must pay attention to the wiring.

4, pay attention to the grounding of equipment: it is very important to connect all the sound equipment to the ground wire correctly. Good grounding can reduce the interference of the signal transmission and improve the stability of the equipment. Note that the ground wire should be in accordance with the lightning line grounding standards, is buried in the underground part of the conductor to rust and contact, to better buried deep, do not share the power line configuration and three-phase grounding line, that will not reduce the noise in the sound system, but also easy to damage the equipment.

5, pay attention to the signal's phase inversion and short circuit: signal line short circuit often cause silent fault. It's very troublesome to check up. Unless a signal line is removed and tested with multimeter, so the welding line must be careful.

Two. Power matching

The specific standard of power amplifier and sound box power allocation is that, under certain impedance conditions, power amplifier should be greater than the power of the sound box, but it can not be too large. The non distortion rate of the power amplifier in the general application place should be about 1.2-1.5 times of the rated power of the sound box, while in the large dynamic situation, it should be about 1.5-2 times. Reference to the standard configuration, since it can ensure the amplifier in good condition, and can ensure the safety of the speaker, even for inexperienced operators, as long as the peripheral equipment before the class is not serious mistakes or improper operation of the school, can let the speaker and amplifier in a stable state.

Note: when using the small power amplifier to push the loudspeaker with high power, it will cause overload of the power amplifier, resulting in harmful current to speakers. At this time, the speaker unit will be easily damaged.

Three. Power reserve matching

The power storage of the electronic tube power amplifier and the transistor amplifier is different than that of the power amplifier. For transistor power amplifier, the selection of power reserve should be 10 times higher than that of high fidelity power amplifier, and 6-7 times the high-end high-end power amplifier. In general, it will also have 3-4 times. And the power amplifier of the tube can be much less than the ratio above. Besides, in order to enable it to withstand the burst and strong impulse of the program signal, it will not damage or distort. The nominal rated power of the selected speakers should be three times the power calculated by theory, which should be suitable.

Four. Impedance matching

It refers to the rated output impedance of the power amplifier, which should be in accordance with the rated impedance of the sound box. The use of professional sound system power amplifier is generally constant resistance, the general power amplifier up to 4 ohm --8 work, some sound love a power amplifier push more than 2 speakers, then you should pay attention to the speaker impedance, many speakers parallel impedance will be reduced, if less than 2 Omega that at this time the power amplifier is very easy to damage, this is similar to short circuit work should be avoided.

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