Purchasing Tips for Mixer

- Jul 24, 2018-

The mixer is an important device in the recording and sound reinforcement system. Its quality is directly affected by the sound quality of the sound. Therefore, the optional mixer has a strong professionalism. There are many parameters of the mixer. Generally, the frequency response, gain, noise, distortion, and linearity can be used as the purchase standard.

1. The frequency response

Also known as frequency response, it characterizes the mixer's bandwidth and level consistency within a defined width. The frequency response of a typical professional mixer is 30Hz--18000Hz±ldB. This is the frequency response of the mixer's total channel. If the frequency response of the mixer is not wide enough, then the high and low sounds will be cut—partially, so that the original sound signal with a wide sound range cannot be recorded with high fidelity. Even if there is enough bandwidth, and there is no flat frequency response, the faithful recording of the original signal cannot be completed. Because the levels of different frequency bands are inconsistent, the signal distortion will inevitably occur. Therefore, the frequency response of the mixer should be wide enough to have flat characteristics. Only in this way, the sound engineer or sound engineer has the original basis when engaged in signal processing, that is, which segment of the frequency band is increased or attenuated, and is raised or attenuated around a certain center frequency.

2. The gain

The gain mentioned here refers to the total gain of the mixer, that is, the logarithm (dB) of the ratio of the output voltage of the mixer to the input voltage. The output voltage U of the mixer is set, the input voltage is U, and then The total gain K of the sound table is written as the gain of the mixer divided into two indicators: large gain and rated gain. The larger gain is the higher level of the mixer, the nominal gain is the rated operating level of the mixer, and the higher level is the upper limit of the mixer's dynamic range. In the case of microphone input, the mixer's gain should be at least 70B, and greater than 90dB. In the case of online speech output and line output, the mixer has a gain of 0 dB.

3. Noise

The noise of the mixer, in the general electroacoustic equipment, the signal-to-noise ratio is commonly used to characterize the relative relationship between signal and noise. The noise of the mixer is expressed by converting the noise at the output to the equivalent noise level at the input. This equivalent noise level converted to the input is typically required to be around -125dB. In this way, the mixer's signal-to-noise ratio can reach 80dB.

4. Distortion

Distortion is a phenomenon in which a simple signal passes through a nonlinear component and generates multiple harmonics, which causes the waveform of the original signal to be changed. This distortion is often called harmonic distortion and is expressed as a percentage. Wave distortion is different from linear distortion and intermodulation distortion. The calculation formula is as follows: harmonic distortion of the mixer, the total harmonic distortion coefficient THD5% under the condition of rated output. For larger outputs, it should be less than 1%.

5. Linear

The linearity of the mixer, like other electro-acoustic devices, refers to the dynamic headroom, also known as the reserve. The calculation method is the logarithmic value (dB) of the ratio of the larger output voltage to the rated output voltage. Expressions can also be expressed as the difference between the larger output level and the nominal output level. Professional mixers should generally have a linearity of 15dB--20dB or more.

 

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