The stand or fall of loudspeaker of bluetooth loudspeaker is having decisive factor to the sound quality of loudspeaker, so the user must understand its performance first when choosing loudspeaker, had an in-depth understanding ability better choice.
In fact, the bluetooth speaker speaker is a kind of audio electrical power signal within the range through the transducer (speaker unit), it is converted into an audible sound with sufficient sound pressure level. To be able to choose correctly, we must first understand the attributes of sound signals, and then ask the speaker to be able to "original" audio signals into a realistic and natural sound.
The human voice and various musical sounds are random signals with very complex waveforms. The frequency range of audible sound is generally up to 20Hz-20KHz; The spectrum range of language is about 150Hz-4KHz. And the spectrum range of various music can be up to 40Hz-18KHz or so. The energy distribution of the average frequency spectrum is as follows: the bass and mid bass parts are the largest, followed by mid and treble parts, and the treble part is the smallest (about 1/10 of the energy of the middle and low parts). The energy of the human voice is mainly concentrated in the frequency range of 200Hz to 3.5kHz. The peak amplitude of these audible random signals is about 10-15dB (or even a little higher) than its average. Therefore, in order to correctly replay these random signals and ensure beautiful sound quality, BPA must have broad frequency response characteristics, sufficient sound pressure level and large signal dynamic range.
We hope to obtain a large enough sound pressure level with a relatively small signal power input, that is, the bluetooth speaker speakers with high efficiency of the sensitivity of electrical power conversion to sound pressure. It is also required that the system will not be damaged when the input signal is overloaded appropriately, that is, it must have high reliability.