Classification of loudspeakers.

1, According to the frequency of the speaker playback full frequency speaker: can replay the full frequency sound (20Hz~20kHz) Tweeter: mainly replay the high frequency part of the sound (4kHz~20kHz) Low and medium speaker: low and medium part of the sound (70Hz~4kHz) ultra-low speaker: Heavy bass part (16Hz~70Hz)

2, According to performance and use

1) Unit speaker: most of the original speakers on the car are unit speakers, whose structure is simple, and can only realize the mid-frequency range, which is manifested as the tweeter is not bright, the bass is not thick, and belongs to the low-grade products.

2) Set speaker: Set speaker is composed of tweeter, woofer, frequency divider. Two frequency and three frequency are commonly used, and their advantages are conducive to the positioning of sound field. Because different speakers are responsible for different frequencies, the frequency division is accurate and the frequency range is wide. The frequency divider connects the sound source, treble and bass, making it a system whose role is to assign the correct frequency to the corresponding speaker to ensure that the high, medium and low speakers can each perform their duties. Mark on the divider: 0, -3dB, -6dB you can choose the attenuation degree of treble according to your personal preference.

3) Coaxial speaker: that is, the high and low speakers are placed on the coaxial or the same chassis. The advantage of coaxial speakers is that they are easy to install, and the sound source is consistent, that is, the store sound source. The disadvantage is that the high notes often "mask" the middle notes; The sound is hard and the sound field is uneven, which is generally recommended for the rear sound field loudspeaker.

4) Subwoofer: Generally more than 200mm, installed in a specially made bass box. The smaller the subwoofer, the harder and crisper the sound; The larger the size, the deeper the sound effect, and the extra weight of the aftersound. At present, the market uses a ready-made subwoofer to do bass, saving the time and trouble of production, but the effect is not as good as the speaker. Subwoofer is just a low-end product. Subwoofers can be divided into active and passive two types. An active subwoofer is a built-in power amplifier that has an independent power supply to drive the subwoofer to push the speaker. The passive subwoofer has no built-in power amplifier, and the subwoofer is driven directly by the on-board power amplifier.