Which parameters mainly determine the volume and sound quality?

The size of the sound is determined by the power of the speaker and the output power of the power amplifier.

Sound quality depends on many factors, such as sound source characteristics (sound pressure, frequency, spectrum, etc. ), signal characteristics of audio equipment (such as distortion, frequency response, dynamic range, signal-to-noise ratio, transient characteristics, stereo separation, etc. ), sound field characteristics (such as direct sound, pre-reflected sound, reverberation sound, binaural cross-correlation coefficient, reference vibration, sound absorption rate, etc. ) and auditory characteristics such as loudness curve.

Extended data

The lower the impedance of the speaker, the greater the input current. If it is a hi-fi speaker, it will cause distortion and the sound will change, and the original sound effect will not be achieved. So when we choose, we choose high impedance speakers. At present, the common impedances are 4 ohms, 6 ohms, 8 ohms and 16 ohms. Among them, the international standard recommends 8 euros.

Generally speaking, the audio is mostly active speakers, and there must be a power amplifier inside, so noise is inevitable. The noise of active speakers can be roughly divided into electromagnetic interference, mechanical noise and thermal noise according to their sources.

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