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True wireless Bluetooth earphones are becoming increasingly popular among people, whether they are novice users or some experienced earphone users. Many of them may be confused when they actually choose them and don't know how to start.
Many high-quality and high-end headphones are not cheap, so we need to learn some knowledge about Bluetooth headphones to find the right one for ourselves.

Below, I will discuss some common terms related to Bluetooth earphones when promoting them.

1、 The principle of headphones
There are two key points to true wireless earphones: true wireless and Bluetooth.

1. True wireless

There are two main principles of true wireless implementation.

Primary and secondary ear connection method


Independent connection method for left and right ears


2. Bluetooth

At present, there are two main versions of Bluetooth earphones on the market: Bluetooth 4.2 version and Bluetooth 5.0 version.

The performance improvement of Bluetooth 5.0 is comprehensive, and several core points can be seen from the above figure: transmission rate, transmission distance, power consumption, and anti-interference.

The doubling of transmission speed makes it easier to transfer bulky lossless music using Bluetooth; The improvement of transmission distance and anti-interference ability makes the stability of wireless earphones more reliable; Reducing power consumption can extend the battery life of headphones.

In short, only Bluetooth 5.0 version is recommended for Bluetooth earphones.



core components

1. Vocal unit

In many headphone detail pages, you can see the manufacturer's promotion indicating terms such as dynamic coil headphones, dynamic iron headphones, dual dynamic coil, dual dynamic iron, etc., all of which belong to the sound unit.

Whether it's dynamic headphones or dynamic iron headphones, no matter how manufacturers promote to compensate for their respective disadvantages, most of them are just gimmicks. The actual effect still depends on the manufacturer's tuning ability, cavity design, and other complex factors. There is currently no standard to measure these factors, and the simplest way is to personally listen and hear their opinions.

2. Chip

Chips are the most essential in any electronic device, and headphones are no exception. Chips are like the brain of wireless Bluetooth earphones, directly affecting the sound quality, battery life, anti-interference ability, stability, and noise reduction ability of the earphones.



3. Encoding and decoding methods

As mentioned above, many big brands specialize in developing chips for headphones, and in the process of developing chips, the first consideration is the encoding and decoding scheme, because this has a great impact on the sound quality of headphones, which also shows the importance of encoding methods.

There are currently several mainstream encoding and decoding schemes:


Encoding and decoding are issues that need to be considered for both the mobile phone transmitter and headphone receiver. Only when both the audio transmitter and receiver are in the same encoding format, can the sound quality be the best. Otherwise, it will be backward compatible, and basic SBC methods should be used.

Referring to the table above, in order to achieve the best sound performance, we need to focus not only on the encoding methods supported by the headphones, but also on the music initiator we use, which is the Bluetooth encoding supported by the phone.

General suggestion:

Android users, Android phones mainly support aptX and LDAC, just find headphones that support these two encodings accordingly;

Apple users, when choosing headphones that support AAC encoding, prefer Apple's own AirPods series;

2、 Earphone performance
1. Headphone parameters

Impedance and sensitivity

We often see these two parameters in the technical specifications of headphones. What exactly are these two parameters? Actually, ordinary people don't need to delve into them. We just need to know that these two parameters need to be put together for reference in order to be meaningful.

All parameter references are relative. The recommended impedance for true wireless Bluetooth earphones should be above 32 Ω and the sensitivity should be between 95dB-120dB.

high fidelity

The so-called high fidelity refers to being close to the original taste of the sound and interpreting the true emotions of the sound, also known as HIFI. We can basically see this in the promotion of many businesses.

endurance

Generally speaking, a 40mAh Bluetooth earphone battery can last for 4-6 hours, an 80mAh battery can last for 6-8 hours, and a 120mAh battery can last for 8-10 hours.

Since the release of AirPods, most Bluetooth earphones come with a charging case, and their battery life is no problem.



2. Earphone quality

sound quality

Sound quality is basically the most important characteristic of headphones. If the sound quality is poor, everything is in vain.

Sound quality is a very subjective selection criterion, and it is actually difficult to determine the quality of sound quality details.

The principle of headphones has been analyzed above, and the sound quality mainly depends on the manufacturer's tuning ability, cavity design, and other complex factors. For ordinary people like us, the best way is to choose a brand that is trusted by the public, look at its reputation, and then actually feel it in our ears, after all, everyone's perception of sound is different.

Analytical power

Analytical power - the ability of headphones to express sound details.

The sound contains high, medium, and low frequencies, and the higher the resolution, the more realistic the details of these sounds will be, giving a sense of "sound" in the environment, but not too high to prevent distortion.

Sound field sensation

The so-called sense of soundstage is like watching a concert, where we can truly feel the layering produced by the distance between the individual and the performer.



Noise reduction capability

The noise reduction capability of headphones refers to their ability to reduce and process external noise.

At present, the noise reduction function of Bluetooth earphones is reflected in passive noise reduction and active noise reduction.

Passive noise reduction is actually "physical noise reduction".

The principle of active noise reduction is to generate opposite audio in the headphones based on external noise, in order to cancel out the noise.

Low latency

If you have played King of Glory before, there may be a scene that is not too unfamiliar, which is the slight footsteps of people in the grass or when someone comes over. The difference in these sounds is very slight, and headphones need to have the lowest possible latency to make early predictions in the game. At this time, it is necessary to choose headphones with the lowest possible latency. In addition, when watching high-quality movies, audio and video synchronization also requires headphones with extremely low latency.

3、 Wearing method
As headphones are products that come into direct contact with sensitive ears, whether they are comfortable to wear is undoubtedly very important.

Mainstream, currently there are only two ways to wear true wireless Bluetooth earphones on the market.

1. In ear style

In ear headphones, as the name suggests, refer to headphones that partially enter the ear canal.

Typical representative of in ear headphones: AirPods Pro.

2. Earplug type

Earplug style headphones are essentially semi in ear headphones.

Typical representative of earbuds: AirPods.

4、 Key points for purchasing



There are many conceptual principles mentioned above, and I hope that they can be more helpful for everyone to choose headphones based on these principles.

Ultimately, when choosing headphones, we mainly consider the sound quality and wearing style.

The sound quality reflects the performance of the headphones, and the wearing method determines the user experience of the headphones.