Sound selection
所属分类:Music culture
发布日期:2018-04-12
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Method/step

1. Distortion: It refers to the distortion of the electric signal conversion. The definition of the distortion of the professional audio is basically the same as the distortion of the amplifier. The difference is that the amplifier inputs the electrical signal, and the output is still the electrical signal, while the speaker inputs the electrical signal, and the output is the acoustic signal.

2. Signal-to-noise ratio: The signal-to-noise ratio is low, and when the small signal is input, the noise is serious. The sound in the entire sound field becomes apparently cloudy and unclear, and it is not known what the sound is, which seriously affects the sound quality.

3. Impedance: It is best not to purchase low-impact conference audio equipment. The recommended value is a standard 8 ohm, mainly because the low-impedance speaker can obtain a large output power but the impedance is too low when the power amplifier and the output power are the same. Low will cause under damping and bass degradation.

4. Sound effects technology: The extended stereo (Extended Stereo) theory is applied. This is through the circuit's additional processing of the sound signal, so that the listener feels that the sound direction is extended to the outside of the two speakers so as to expand the sound and make people There is a sense of space and three-dimensional, resulting in a more spacious stereo effect.

5. Frequency response range: Nowadays, the conference audio system manufacturers generally have too much scope for the frequency response of the system, and there are not many high-frequency partial differences, but they are extremely unrealistic at the bass end, so do not believe the value on the flyer. . The full name of the frequency response range is called frequency range and frequency response. The former refers to the range between the lowest effective playback frequency and the highest effective playback frequency of the speaker system; the latter refers to the change of the sound pressure generated by the sound system with the frequency when a constant-voltage output audio signal is connected to the system. The phenomenon of increase or attenuation and the change of phase with frequency occurs. The relationship between this sound pressure and the phase-to-frequency correlation is called the frequency response in decibels (dB).

6. Sensitivity: refers to the sound pressure level measured one meter in front of the vertical center axis of the loudspeaker speaker plane when inputting 1W/1kHz signal to the input terminal of professional audio equipment. Sensitivity is in decibels (dB).

Precautions 

Power: There are two ways to label power: rated power and maximum power (instantaneous power or peak power PMPO). The rated power is the maximum undistorted power that can be sent by the loudspeaker to the loudspeaker with a specified waveform in the rated frequency range, and the maximum power to be received is the maximum electric power that the loudspeaker does not suffer from any damage. The maximum power of the speaker is mainly determined by the power of the power amplifier's chip, and it also has a lot to do with the power transformer. However, the power of the conference audio equipment is not as great as it is better.

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