Notes

How to figure out the sound quality of Bluetooth speakers?
1. How to buy and sell Bluetooth portable speakers (how to identify the sound quality is good or bad) The purchase of Bluetooth portable speakers in 2 parts: the sound quality is excellent or bad usage function 1, use function since it involves the function of portable, so making use of functionality is also the top concern in the choice of Bluetooth speakers.
（ 1 ） The endurance time depends. The longer the much better for the same rate.
（ 2 ） Dustproof and water resistant grade to see. Certainly the greater the better, dustproof grade approximately 7, waterproof grade as much as 8
（ 3 ） Bluetooth interaction protocol variation to take a look at. At present, the very best variation is 5.0 or above, the greater the version, the better. The higher the power usage is smaller, the faster the transmission speed. Naturally, the smoother it will be.
（ 4 ） It depends on whether the combination of stereo or more than one in series. Can be integrated implies that 2 systems can be combined into a left and best channel stereo, or more than one in series usage
( 5) to see if it includes a microphone. Microphone is a radio gadget, with a microphone can be linked to the phone when the speaker, you can talk straight to the speaker. The more the variety of microphones, the better the radio capability, the more plainly the opposite side of the hearing.


2 ， Sound quality is great or bad sound quality is what, is the capability to restore the natural noise, bring back 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 an extremely metaphysical thing, although it is the outcome of a mix of numerous hardware configurations and parameters, but there is likewise subjectivity. After all, people's subjective feelings differ, and everyone's sense of listening is different. Some people choose the bass, some choose the midrange life, some people are more worried about the value of the face, look comfy listening to be comfy. So if you have the conditions, my suggestions is that you can go to the scene to listen, the one you like best is the very best. But if it is excessive difficulty, or look at the criteria. This is, after all, the outcome of science, will not be 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 higher the sound, the bigger the size implies that the sound texture is also better, because the larger the area of air movement that can be pushed by the speaker. Lot of times you will discover numerous speakers of the exact same brand with different power and size, the rate is likewise different.
( 2) look at the frequency action range. Frequency reaction variety is drawn from the frequency response curve, normally the best to see their own frequency reaction curve. However the basic producers do not give, so look at the frequency action range. Generally speaking, the human ear can hear the frequency is 20hz-20khz, here includes the high school and low 3 frequencies. So, the closer to 20hz the better the bass performance, the closer to 20khz the more transparent the treble. More than this naturally will be better, although the human ear can not hear, but the human body is felt.
（ 3 ） Take a look at the signal-to-noise ratio. This is the ratio of sound signal and noise, expressed in db. The bigger the worth, the smaller sized the ratio of signal and noise. Typically speaking, mini bluetooth speaker than 80db is thought about an excellent product. Obviously, the higher the better, the higher the willingness to change the sound over the less noise pollution received.
( 4) Look at the speaker's sound quality accreditation. 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 accreditation, implying that you can play lossless audio sources.

Obviously there are numerous sound quality parameters, such as impedance and so on, but I believe these criteria are more core. It is enough to explain the volume of the speaker sound quality is excellent or bad.
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