Fandou Technology engineers teach you the purchasing skills of card speakers
Fandou Technology engineers teach you the purchasing skills of card speakers
For the initial understanding of the card speaker, the steps of "watching, listening, and recognizing" can be used to identify: firstly view the technology and parameters, secondly listen to the sound quality, and thirdly recognize the brand.
A look at the process and parameters
At first glance, the craftsmanship is to judge the quality from the first appearance of the speaker, and whether the production craftsmanship is accurate and in place. Counterfeit and inferior products generally do not pay attention to these details, so a little care can be used to judge correctly. The technical parameters of the card speaker are nothing more than frequency range, output power, and signal-to-noise ratio.
The frequency range is generally 90Hz～20KHz. 90Hz represents the extension value of the card speaker in the low frequency direction. The lower the number, the better the low frequency response of the card speaker: 20KHz represents the high frequency extension value of the card speaker. The higher the number, the better the audio characteristics.
The output power is a reference indicator of the card speaker. It is expressed in watts. This indicator does not indicate the quality of the speaker. It only indicates that the power amplifier required to drive the card speaker needs to have the required output power.
The signal-to-noise ratio refers to the ratio of the output signal voltage of the amplifier to the noise voltage output at the same time. It is often expressed in decibels. The higher the signal-to-noise ratio of the device, the less noise it produces. Generally speaking, the larger the signal-to-noise ratio, the smaller the noise mixed in the signal and the higher the sound quality of the sound playback, otherwise the opposite. The signal-to-noise ratio should generally not be lower than 70dB, the signal-to-noise ratio of high-fidelity speakers should reach 110dB or more, and the minimum signal-to-noise ratio marked by card speakers is mostly between 70dB and 90dB.
Second listen to sound quality
The card speakers are mostly made of plastic. The smaller the material density of the speaker shell, the greater the vibration generated by the cabinet when the sound is emitted. From this aspect, it is difficult for the card speakers to achieve the super bass effect to a certain extent. It is also a common problem with almost all card speakers. However, the so-called "extreme" must be reversed. Although the card speaker is slightly insufficient in terms of bass, the performance of high and intermediate frequencies can be very good. With different design structures and different cavity sizes, the sound quality of the card speakers may still vary greatly.
Three recognition brands
Good card speakers have well-made gold-plated or chrome-plated brand marks. If the trademark does not have a registered mark, there is no anti-counterfeiting certification mark on the outer package, and there is no warranty card inside the package, most of these three-free products are suspected of being counterfeit or fake.
origin
Speaking of the origin of card speakers, the industry generally believes that the popular and hot-selling card speakers extend to notebook speakers in 2008. The introduction of notebook speakers has begun to attract attention to the market segment of card speakers and notebook speakers. In 2009, a card audio system appeared in the industry, that is, SD card/U disk can be inserted. At that time, wooden cabinets were mainly used. However, the improvement of the appearance design of the rear cabinet has also produced great changes, and there are no fixed design standards for speakers and batteries, which has caused many after-sales problems. In the second half of 2009, some planned manufacturers began to produce digital audio with plastic casing.
It has been several years since the appearance of the card speaker in 2012, and it has developed into a digital audio that can support USB, SD/MMC card, and radio functions in 2012. It has powerful functions and has gradually become a fashion symbol code. There is a demand, so there is a market. However, the popular digital audio system has found that the sound quality is average, and it should be said that there is a certain gap between the high-end products.
status quo
The monthly market capacity of card speakers is about 20 million units. However, in 2012, manufacturers and channels have more than one million units in stock. Why is this situation? It is because a large number of card speaker manufacturers have poured in, and the threshold is very low. There are as many as 200 card speaker manufacturers in Shenzhen, and another part of non-brand manufacturers mainly rely on price wars to attract attention. The quality is not guaranteed at all. If the normal profit of a factory cannot be guaranteed, plus some subsequent repairs The pressure of closing is a matter of time, and the first three months are the most obvious.
development trend
In 2012, digital card speakers went out of business almost every day. If the cost of a product is 40 yuan, about 20 yuan will be thrown directly to the channel. Many channels are speculative and greedy for cheap and are willing to accept it in order to make short-term quick money. This product is a spoiler. At the same time in this industry, it is also a staged disaster for many digital speaker manufacturers who are committed to brands. Many so-called brand manufacturers are also affected by the decline in the market. The early reshuffle has arrived. See who can stick to the final estimate in mid-2012. It can be clear at a glance.
From a technical point of view, its development trends are:
First network
Add wifi function to realize networking
Second intelligence, increase software functions
Such as learning machine, repeater, etc.
The third emphasis on the radio function
Because the radio function is very cheap to realize the function, some multi-band radio chips, such as AM, FM, SW functions have appeared, and the magnetic micro-space line can realize multi-band reception.
The fourth is to strengthen mobile TV functions
The introduction of the built-in full-band TV antenna enables this type of terminal to receive analog and digital TV functions.
Fifth equipped with Bluetooth module
Using high-quality Bluetooth 3.0+EDR, the maximum reception can reach 10 meters, and the voice is clear and no echo, which is your unique choice for driving.