Do you know which parameters are important to the amplifier?

Do you know which parameters are important to the amplifier?

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Update time : 2019-09-20 17:53:42
Input sensitivity, harmonic distortion, output power, signal-to-noise ratio, frequency response, Damp Factor, etc. These are important technical parameters of the power amplifier. Do you know them? What is their role in the amplifier? Let's take a look.

Several important technical parameters of the power amplifier.

enlightenedInput sensitivity : 

When the power amplifier is at a specific load output (8,4 ohms, etc.) that reaches full power output, the magnitude of the signal voltage at the input. The unit is dB, and the sensitivity voltage is expressed in V.
Common professional amplifier input sensitivity selection switches are usually: 0.775V, 1.0V and 1.44. The relationship between them is that the higher the sensitivity voltage, the lower the input sensitivity. Has lower distortion, wider frequency response and better sound quality. For example, the input sensitivity of the Sinbosen K series digital power amplifier is: 0.775V/26/32dB. Lower sensitivity, lower distortion, better sound quality.
enlightenedHarmonic distortion:

This is a very important indicator of the power amplifier. Harmonic distortion is a kind of nonlinear distortion, which is caused by the nonlinear characteristics of the amplifier during operation. The distortion result is a new harmonic component, which causes the sound to lose its original tone. In severe cases, the sound is broken and harsh. Generally, high fidelity requires harmonic distortion below 0.05%, the lower the better. In addition to harmonic distortion, there are intermodulation distortion, cross distortion, clipping distortion, transient distortion, phase distortion, etc., which are important reasons for affecting the quality of the power amplifier.

enlightenedOutput power:

A. Rated output power. Called (RMS), indicates the higher power that the amplifier's output audio signal can output in the total harmonic distortion range. It is typically 0.707 times the peak value of the AC signal.
B. Average power. Average power generally refers to the average power consumption at each frequency point.
C. Peak output power. The larger music power that the power amplifier can output is called the peak output power. It does not consider distortion, and is usually about 1.414 times the (RMS) power.
D. Peak power. It refers to the power of the peak of the positive voltage to the peak of the negative voltage, which is four times the peak output power.

enlightenedSignal to noise ratio:

The larger the value, the better, generally expressed by (S/N), expressed in decibels of the ratio of the signal power Ps to the noise power Pn, S/N=10lgPs/Pn=20lgVs/Vn(db). In the formula, Vs and Vn are signal voltage and noise voltage.
The signal-to-noise ratio and the input signal level increase, the signal-to-noise ratio also gradually increases, but when the input signal level reaches a certain value, the signal-to-noise ratio remains basically unchanged. According to the current high fidelity requirements, the signal-to-noise ratio should be above 90dB. Imported high-quality power amplifiers often reach 110-120dB, and their performance is very good. In short, the larger the signal-to-noise ratio, the smaller the noise mixed in the signal, the better the playback quality, and the music sound is clear, clean and layered. For example, the FP amplifier and DSP amplifier family has a signal-to-noise ratio greater than 112 dBA. The sound quality is very much appreciated by DJ, and the sound is very clear.

enlightenedFrequency response:

When the harmonic distortion does not exceed the specified value, the frequency band included between the two high-frequency and low-end gains respectively falling by -3 dB is called the power response. The frequency response of a better amplifier is generally between 18Hz and 20kHz.

enlightenedDamp Factor:

Mainly for low frequency, it is a very important technical parameter that directly affects the bass sound quality.
As we all know, the larger the diameter of the speaker, the better the bass is. However, the larger the cone, the greater the inertia of the motion. This inertia makes it difficult to synchronize with the audio signal, and the sound is often opaque, especially At the low frequency of 100-400 Hz, it makes people sound unclear and unnatural.
In the design of the power amplifier, the engineer takes some technical measures on the power amplifier, such as selecting multiple tubes and parallels, low internal resistance (milliohms) high power tube, increasing the working voltage, selecting excellent wire, etc., and trying to increase the damping coefficient so that it can be used for the speaker. The inertial motion produces a "resistance" effect, so that the motion of the cone is synchronized with the audio signal, so that the cone is restored to the zero position (ie, the center position) as soon as possible after the end of the drive signal. This blocking effect is the damping coefficient. (Damp Factor), D=Rs/Ri, Rs=horn impedance, Ri=power amplifier output internal resistance, the bigger D, the better the sound basin and signal synchronization effect, the purer and cleaner the bass, the better the playback effect.


The above is the most important parameter of the power amplifier we have summarized. If you have any questions, please contact us.

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