Tips on sound

1. Impedance

Impedance is not resistance. We often make mistakes here. In fact, impedance is the sum of resistance and reactance. Resistance refers to the blocking effect of objects on current in direct current. In the AC point, in addition to the resistance, the capacitance and inductance will also hinder the current, which is the reactance. According to the information I found, the impedance value actually has no key impact on the sound quality. However, if the impedance is too low, resulting in excessive current, it is also easy to distort the sound. For players who like to listen to music, the impedance is relatively sensitive. The common values of speakers are 4, 6, 8 and 16, and the internationally recommended value is 8 Ω

It refers to the sound pressure level measured when the speaker inputs 1W electric power, 1m away from the assembly center of each event on the front of the speaker, and the unit is dB. In other words, sensitivity is related to the volume of the speaker. Under the same volume condition, the speaker with higher sensitivity has much less possibility of sound distortion. The sensitivity of high fidelity speakers is 86db, and that of professional speakers is more than 96dB. You can refer to it when purchasing speakers.

3. Rated power

(RMS) in short, it is called effective power, that is, the maximum power value of the speaker for long-term safe use without distortion. Peak music output power (PMPO): that is, the instantaneous maximum output power of the power amplifier without considering distortion. This value does not consider distortion and exceeds a certain range. Is it meaningful? In fact, we can also get the ratio between it and rated power through conversion. Some conversion ratios are 1:8

4. Signal to noise ratio

It refers to the ratio of the normal sound signal played back by the speaker to the noise signal without signal, which is also expressed in dB. The higher the value, the better the sound quality, but the higher the price... Generally, the signal-to-noise ratio of 2.0 speakers can reach 80dB, or larger.

5. Speaker diameter

Some people think that the larger the diameter of the loudspeaker, the better. In fact? Of course not. Because when the diameter of the loudspeaker increases, the paper basin is easy to deform and damage when it vibrates, which will also affect the sound quality. Therefore, the caliber of low-frequency speakers is generally 20-38cm. Of course, there are also super large caliber cannons of 60 or 72cm. The caliber of the tweeter is usually between 2-6cm, and occasionally there are guys larger than 9cm.

6. Distortion

It refers to the difference between the amplified signal and the non amplified signal when compared with the amplified signal. The unit is percentage. For multimedia speakers, distortion cannot be avoided, as long as it is controlled within a reasonable range. For example, 2.0 speakers must be less than 1%, x.1 must be less than 5%, 2.0 speakers must be less than 1%, and x.1 must be less than 5%.

7. Weight

The heavier the speaker, the better the wood used and the larger the magnetic steel inside, which can effectively improve the sound quality.