Subwoofer knowledge

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Active speaker

Active speakers are one of the most common names. A simple sound system includes sound sources (such as CD player, MP3), power amplifiers, and speakers. The active speakers are built-in power amplifiers that can be directly connected to the audio source for playback. Corresponding to the active is the passive speaker, indicating that the internal itself does not have its own amplifier, and needs to be connected externally.

2. Car subwoofer

A common name for everyone in the subwoofer, it should include a subwoofer. In terms of audio analysis that is audible to the human ear, it consists of subwoofer, bass, low midrange, midrange, mid-high, high, and super-high. There are 2 satellite speakers next to it. The car subwoofer is a subwoofer used in cars and motorcycles to meet the owner. Generally speaking, the car subwoofer is stricter than the ordinary subwoofer.

3. Stereo

The role of stereo is to simulate the difference between left and right ears, let us listen to the sound has a sense of space. Stereo music is divided into left and right channels, so listening to stereo music can make people feel the spatial sense of space and positioning. As a stereo playback device, the sound source, power amplifier and speaker must be both left and right.

4. Card subwoofer

Refers to the card subwoofer with USB, SD interface, can be directly played by an external audio source, and some have their own low-power amplifier.

5. Signal to noise ratio

Signal-to-noise ratio, as its name implies, is the ratio of signal to noise. The unit is DB. The larger the value, the stronger the signal and the lower the noise, and the better the indicator. The signal-to-noise ratio of our small speakers can reach about 60DB. The ear can be heard with a slight noise when it is attached to the speaker. It is almost inaudible when it leaves 30cm, which is a good indicator.