Notes

How to determine the sound quality of Bluetooth speakers?
1. How to buy and sell Bluetooth portable speakers (how to figure out the sound quality is excellent or bad) The purchase of Bluetooth portable speakers in two parts: the sound quality is good or bad usage function 1, usage function since it involves the function of portable, so the use of performance is also the leading concern in the selection of Bluetooth speakers.
（ 1 ） The endurance time depends. The longer the better for the very same rate.
（ 2 ） Dustproof and waterproof grade to see. Certainly the greater the better, dustproof grade up to 7, waterproof grade up to 8
（ 3 ） Bluetooth communication protocol variation to look at. At present, the very best version is 5.0 or above, the higher the variation, the better. The greater the power intake is smaller sized, the much faster the transmission speed. Naturally, the smoother it will be.
（ 4 ） It depends upon whether the combination of stereo or more than one in series. Can be combined suggests that 2 systems can be integrated into a left and right channel stereo, or more than one in series use
( 5) to see if it comes with a microphone. Microphone is a radio device, with a microphone can be linked to the phone when the speaker, you can talk directly to the speaker. The more the variety of microphones, the much better the radio capability, the more clearly the opposite side of the hearing.


2 ， Sound quality is good or bad sound quality is what, is the capability to restore the natural noise, restore the closer to the natural noise is better. Good sound quality: listen to the tune as if in the scene; listen to the water as if at the water's edge; listen to the birds as if in the forest. To summarize a word is: immersive
Sound quality itself is a really metaphysical thing, although it is the outcome of a mix of different hardware setups and parameters, however there is also subjectivity. After all, individuals's subjective sensations vary, and everybody's sense of listening is various. Some individuals prefer the bass, some prefer the midrange life, some individuals are more worried about the value of the face, look comfortable listening to be comfortable. So if you have the conditions, my guidance is that you can go to the scene to listen, the one you like finest is the very best. But if it is too much trouble, or look at the criteria. This is, after all, the result of science, will not be even worse where to go.
( 1) take a look at the power and size of the speaker. The speaker is the basis of sound playback, is the hardware for pronunciation. The greater the power represents the greater the noise, the bigger the size suggests that the sound texture is also much better, because the bigger the area of air motion that can be pushed by the speaker. Often times you will discover a number of speakers of the exact same brand with different power and size, the cost is likewise different.
( 2) take a look at the frequency action variety. Frequency action variety is taken from the frequency action curve, usually the very best to see their own frequency action curve. But the general makers do not provide, so take a look at the frequency reaction variety. Generally speaking, the human ear can hear the frequency is 20hz-20khz, here consists of the high school and low 3 frequencies. So, the closer to 20hz the much better the bass efficiency, the closer to 20khz the more transparent the treble. More than this of course will be much better, although the human ear can not hear, however the human body is felt.
（ 3 ） Look at the signal-to-noise ratio. This is the ratio of sound signal and sound, expressed in db. The bigger the worth, the smaller the ratio of signal and sound. Typically speaking, mini bluetooth speaker than 80db is considered an excellent product. Of course, the higher the better, the higher the desire to transform the noise over the less sound pollution received.
( 4) Look at the speaker's sound quality certification. For example, hi-fi, hifi-end, hi-res audio and so on. hifi needless to say, this is the quality of the speaker. hi-res audio thing high-resolution audio certification, indicating that you can play lossless audio sources.

Of course there are lots of sound quality parameters, such as impedance and so on, however I believe these specifications are more core. It is enough to describe the volume of the speaker sound quality is excellent or bad.
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