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popular science channel audio introduction the general audio channels are 2.0, 2.1, 5.1, 7.1. stereo output through two channels is called 2.0 channel
, 2.0 channel plus subwoofer is 2.1 channel, 5.1 channel is 2.1 channel plus two left and right surround channels and a center channel.
in 7.1, two surround speakers were added between the main speaker and the surround back speakers.
the best surround effect is 7.1, and 2.0 is the worst. 2.0 is suitable for listening to music, 2.1 is suitable for watching movies and playing games, and 5.1 and 7.1 are generally used in home theaters.
refers to the volume that the speaker can emit after inputting a certain power signal. the sensitivity of general household speakers is between 83-92db.
3. frequency response
the range of human hearing is about 20hz-20khz. the lower the frequency, the closer to 20hz, the better the bass dive.
the actual speakers can't reach 20hz, and the bass of 50hz frequency speakers is also good.
4. signal-to-noise ratio
should be ≥90db, the higher the signal-to-noise ratio, the smaller the noise. good sound can reach ≥100db.
5. dynamic range
should be ≥90db, the higher the better. good audio can reach ≥140db.
6. power size
it depends on the situation. if you use small-range speakers, at least 30w of effective power is required. generally speaking, the higher the product power, the higher the cost performance.
the standard impedance is 8 ohms, and the impedance is usually 4 ohms, 5 ohms, 6 ohms, 8 ohms, and 16 ohms. generally speaking, the higher the better.
the smaller the better, generally within 3%, within 1%, which is very demanding.