The speaker is very important. The speaker is the terminal of the whole sound system. Its function is to convert the audio energy into corresponding sound energy and radiate it into the space. It is an extremely important part of the sound system, because it is responsible for turning the electrical signal into an acoustic signal for the direct listening of the human ear. It has to deal directly with human hearing, and the human hearing is very sensitive. And it has a strong ability to distinguish the sound of complex sounds. Since the human subject's subjective feeling of sound is the most important criterion for evaluating the sound quality of a sound system, it can be considered that the performance of the speaker plays a key role in the sound quality of an audio system.
How to judge the pros and cons of the speaker ? There is usually a technical label on the back of the finished speaker: the content is nothing more than the frequency range, sensitivity, carrying power and impedance of the speaker. The sensitivity rate is the most important indicator of the speaker, which determines to a large extent what kind of power amplifier should be selected for the box, how much power to push and so on. The sensitivity of most audio-visual home speakers is between 86-92dB. For the same amplifier, at the same volume (such as the volume is turned to 10 o'clock), the higher the sensitivity, the greater the sound, the speaker pair The power requirements and requirements of the amplifier will be lower.
This is what people often say: this is a good push for the speakers. The sensitivity of professional speakers used in many commercial OK halls exceeds 100dB. It is no wonder that many people feel that when they go to the OK Hall to sing karaoke, the sound is very awkward and they can get a lot of volume without any effort. But don't think that the higher the sensitivity, the better. In fact, speakers with a sensitivity of more than 92dB are lighter, thinner metal basins, PP basins, etc., which can cause damage to the control of the horn. It leads to thin sound, partiality, exaggeration, and toughness, and lacks the details and charm of many music. Not suitable for HI-FI audition. Many brand-name speakers with thick and soft sounds are usually less sensitive. For example, the top speakers such as the British ATC, the Italian famous piano, and the Zhuoli are only 82dB. These types of speakers are often extremely difficult to service, and require a giant power amplifier with a large output current to operate in an ideal linear region at a low cost.
Another most important indicator is the frequency range. For example, the frequency range of the domestic boutique Xindeke Compass No. 1 bookshelf box is 60Hz~20KHz±2.5dB, and 60Hz indicates the extension value of the speaker in the low frequency direction. The lower the number, the better the low frequency response of the speaker: 20KHz represents the high frequency extension that the speaker can achieve. The higher the number, the better the audio characteristics. The ±2.5dB suffix indicates the distortion of the frequency range of the above segment. The smaller the distortion, the flatter the frequency response curve.
Some speakers are marked with a distortion of ±3dB and their frequency range should be wider. Some speakers do not indicate this indicator, and the frequency extension range becomes very wide. For example, if the compass one box does not indicate that the distortion is controlled within plus or minus 2.5 decibels, the frequency range can be marked as 40 Hz to 23 kHz. It should be pointed out that the frequency range without the distortion is meaningless. If the manufacturer knows what to do, it can only be suspected of being bad-hearted and deliberately deceiving consumers. At the same time, it also indicates that the speaker index is not standardized, and the manufacturer lacks confidence in its own products, making it difficult for people to buy with confidence.
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