[Home Theater Network HDAV.com.cn] Damping coefficient - refers to the ratio of the amplifier's rated load (speaker) impedance to the actual impedance of the power amplifier. A large damping coefficient means that the output resistance of the power amplifier is small, and the damping coefficient is the ability of the amplifier to control the movement of the speaker cone after the signal disappears.
Damping coefficient - definition
Damping coefficient: refers to the ratio of the rated load (speaker) impedance of the amplifier to the actual impedance of the power amplifier. The large damping coefficient indicates that the output resistance of the power amplifier is small, and the damping coefficient is the ability of the amplifier to control the movement of the speaker cone after the signal disappears. An amplifier with a high damping coefficient is more like a short circuit to the speaker and reduces its vibration when the signal is terminated. The output impedance of the power amplifier directly affects the low-frequency Q of the speaker system, which affects the low-frequency characteristics of the system. The Q value of the speaker system should not be too high, generally in the range of 0.5 to 1. The output impedance of the power amplifier is a factor that causes the low frequency Q to rise. Therefore, it is generally desirable that the output impedance of the power amplifier is small and the damping coefficient is large. The damping coefficient is generally between tens and hundreds, and the damping coefficient of a high-quality professional power amplifier can be as high as 400 or more.
A second-order and second-order speaker splitting system, the internal energy consumption of the speaker system during the movement has two situations:
System energy remains unchanged;
The system energy is gradually reduced;
The damping coefficient is a characteristic that indicates energy reduction.
The relationship between the horn and the amplifier is intricate. The matching of power and sensitivity is only a basic, and the current and the horn are unpredictable. It can not be judged from the specification list. It can only be heard by experience and with the ear. . In addition to the current unpredictable, the same is the Damping Factor.
Damping coefficient - explanation
The damping coefficient is one of the specifications of the amplifier, which directly affects the handling of the loudspeaker by the amplifier. Generally, the damping coefficient data provided by the amplifier only announces the damping coefficient of a certain frequency band. But in fact, the damping coefficient of most amplifiers will change in different frequency bands, so the data provided can only be used as an approximate indication. Some horns require a high damping coefficient to control the movement of the unit. If equipped with a damped amplifier, the unit will be out of control, resulting in unnecessary harmonic and audio loss. Conversely, if a pair of speakers that do not require a high damping coefficient is equipped with a high-damping amplifier, the unit will be stunned by the high damping, and the tail will be extremely short. Improper damping matching will make a pair of very good horns become less than those produced by Duck Street.
The relationship between the horn and the megaphone is ever-changing. It is forbidden to go through the old book. Although there are certain rules, there must be psychological preparations, and accidental surprises occur at any time. Therefore, it is necessary to objectively treat the match between the two. Want to know if a megaphone is equipped with a certain speaker, in addition to asking experienced friends, it is best to listen to a lot of different combinations.
Damping coefficient - matching
The damping coefficient KD is defined as: KD = rated output impedance of the amplifier (equal to the rated impedance of the speaker) / internal resistance of the amplifier output. Since the output internal resistance of the amplifier has actually become the resistor of the speaker, the KD value determines the amount of resistance the speaker receives. The larger the KD value, the heavier the resistance. The KD value of the power amplifier is not as large as possible. If the KD value is too large, the speaker resistance is too heavy, so that the pulse front time is established and the transient response index is lowered. Therefore, when selecting an amplifier, one should not pursue a large KD value. As a home high-fax power amplifier, the damping coefficient has an empirical value for reference; the transistor power amplifier KD value is greater than or equal to 40, and the vacuum tube power amplifier KD value is greater than or equal to 6. To ensure the steady-state characteristics of the playback and the basic conditions of good transient characteristics, attention should be paid to the equivalent mechanical quality factor (Qm) of the speaker and the damping coefficient (KD) of the amplifier. This coordination requires the speaker cable as the overall sound system. Part to consider. This fit can be achieved with a power loss of the speaker cable of less than 0.5 dB (about 12%).
Generally speaking, the thicker the speaker cable, the better. It is better to have a two-line crossover. However, the speaker is required to have a crossover with two-line crossover. Generally, there are four terminal blocks in the middle and high-end, and the two negative electrodes on the upper and lower sides are Independent, not connected together.
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