How does the amplifier match the speaker?
In the use of audio equipment, in order to obtain the best Audio quality + picture quality effect, you must master the matching method of speakers and power amplifiers, otherwise the best equipment will not be able to play its due performance. Then, we must pay attention to the matching degree of the amplifier and the speaker when connecting the amplifier and the speaker. So what do power amplifiers and speakers have to match?
1. Power matching
The specific standard for the power configuration of the amplifier and the speaker is: under a certain impedance condition, the power of the amplifier should be greater than the power of the speaker, but not too large. In general applications, the undistortion rate of the power amplifier should be about 1.2-1.5 times the rated power of the speaker; in large dynamic situations, it should be about 1.5-2 times. According to this standard for configuration, since it can ensure that the power amplifier works in the best state, and can ensure the safety of the speaker, even for inexperienced operators, as long as it is not a serious operation error or improper adjustment of the front-end peripheral equipment, it can be Speakers and amplifiers work in a steady state.
2. Power reserve matching
The power reserve required for tube amplifiers and transistor amplifiers is different. For transistor power amplifiers, the selection of power reserve should reach the standard of about 10 times for high-fidelity power amplifiers, about 6-7 times for civilian high-end power amplifiers, and generally 3-4 times. The tube power amplifier can be much smaller than the above ratio. In addition, in order for the speaker to withstand the burst strong pulse impact in the program signal without damage or distortion, the nominal rated power of the selected speaker should be about three times the theoretically calculated power.
3. Impedance matching
It refers to the rated output impedance of the power amplifier, which should be consistent with the rated impedance of the speaker. At present, the power amplifiers used in professional speaker systems are generally of constant resistance. Generally, the power amplifiers work most at 4-.--8Q. Some audio engineers like to push more than 2 speakers with one power amplifier. At this time, it is necessary to pay attention to the impedance of the speakers. , when multiple speakers are connected in parallel, the impedance will decrease. If it is lower than 2Q, then the power amplifier will be easily damaged. This kind of short-circuit working method should be avoided.
4. Matching of damping coefficient
The damping coefficient is the rated output impedance of the power amplifier/the output internal resistance of the power amplifier. Since the internal resistance is actually a resistive component of the audio, the damping coefficient determines the amount of electrical damping the speaker is subjected to. The larger the resistance, the higher the resistance of the speaker will be, which will reduce the transient response index. Generally speaking, when choosing a home power amplifier, the damping coefficient should be greater than or equal to 40, and the damping coefficient of the tube power amplifier should be greater than or equal to 6. If you want to ensure the stability of playback and the transient characteristics are not affected, it is particularly important to cooperate with the mechanical quality of the Audio and the damping coefficient of the power amplifier.
5. Wire matching
There are many imported fever wires and nerve wires, which cost more than 10,000 yuan, and the second is from 1,000 yuan to several thousand yuan. The effect of use is a matter of opinion. A good wire will generally improve the lack of a certain system in the audio equipment. Its transmission theory is too complicated to describe. The material and structure of the transmission line determine three important parameters, namely resistance, capacitance, and inductance. Regardless of the small gaps in these parameters, they will directly affect the frequency characteristics, damping characteristics, signal rate, phase accuracy of the audio system, as well as the timbre orientation and Audio quality. Audio field positioning, etc. Its main function is high-speed transmission, anti-vibration, anti-noise, anti-interference ability.