Is the music too quiet? The sound effect of the movie is not impressive enough? At this time, you need a sound reinforcement equipment - audio. As the three audio giants in the audio field together with microphones and earphones, the sound industry seems to have developed slowly in the past decades, but with the advent of the Internet and cloud era, this situation has greatly improved. From the appearance, sound quality and price, today's audio products are different from those of the past. Today, I will take you to experience Langqin Phantom T600XL This special "color" portable audio.

one Unpacking

First, take a look at Lang Chin's phantom T600XL Although the packaging design of the cardboard box looks a little simple, the quality is very strong. Even in the face of rough express delivery industry, there is no need to worry about equipment damage during transportation. There is only intelligent Bluetooth spectrum light effect sound on the front, and Langqin Phantom on the back T600X Basic functions and parameters of. Open the box and you will see Langqin's phantom T600X Body, manual and warranty card on the side, USB Data line and AUX The audio cable and metal hook are placed in a small bag at the bottom of the box.

two Appearance

Langqin Phantom T600X The plastic fuselage is a whole piece on the front LED The surface of the display screen is covered by the iron network unit, and the side is designed with honeycomb silica gel, which can alleviate the wear in outdoor use. There are four power indicators and two on the top MIC Hole, and one button hands-free call / Answer / Call back button, previous \ Next switch key, equivalent switch key and mode switch key. At the bottom of the back is the power switch, Micro USB Interface, 3.5mm Audio interface and internal coarse card slot, with sealed design.

Langqin Phantom T600X Audio supports Bluetooth four ， AUX ， NFC as well as TF The card has four audio playback modes and can be used as a card reader to operate the files in the memory card. Since the basic functions are almost the same as one of Xiaomi's Bluetooth speakers, Xiaobian makes a simple comparison between the two speakers (because there is no physical object, the parameters of Xiaomi speakers are all from the official website, for reference only).

First of all, let's talk about the appearance. Xiaomi speakers are made of aluminum alloy, with three colors of blue, purple and gold, while Longqin Phantom T600X There are also three colors: Flaming Red, Hanhai Blue and Charming Black. Although the aluminum alloy design looks more beautiful, Langqin Phantom T600X It also has its own advantages. The aluminum alloy design has poor wear resistance and is only suitable for indoor use, while Longines Phantom T600X However, the design of our plastic can be used in any occasion. However, aluminum alloy design also has certain reference value. Longines can consider the aluminum alloy series specially designed for indoor use in the later stage. In addition to materials, Langqin Phantom T600X The unique light effect design is incomparable with other acoustics T600X When playing music, it can provide five light effects, namely party, pulse, walk, rainbow and meteor, which are not only dazzling, but also full of rhythm. however LED The display effect of is still slightly rough. If it is improved to LCD Will the glass display screen work better?!

three performance testing

Of course, appearance is only a part of the product, and the most important thing is the quality of the product. For audio products, whether headphones or audio, speakers (that is, speakers) are always one of the most important components. The size and quality of speakers directly determine the frequency response characteristics of audio equipment, which is commonly known as sound quality. Because the minor editor is just majoring in acoustics and signal, and has professional acoustic testing and analysis equipment, he has a vision of Langqin T600X A simple test was made on the frequency response characteristics of.

The so-called frequency response characteristic is to give a white noise to the audio device, and play it after the power is amplified by the audio device. A good audio device should amplify the signal by the same multiple in the widest band possible, that is, without distortion. What is white noise? In fact, it is the kind of sound that the TV station emits when there is no signal. Its characteristic is that the amplitude is the same at all frequencies. Its waveform and spectrum are shown in the following figure.

The white noise is tested through the external sound source mode T600X The small editor found that there was an obvious electrical noise in the audio in the external sound source playing mode, which was caused by the working current of the internal circuit of the audio. The small editor also tested this. The waveform and spectrum are as follows.

It can be seen that the low frequency and high frequency parts are still very large, which will have a greater impact on the frequency response of the audio, as can be seen in the following analysis.

How about the signal collected after playing white noise through external audio source mode? Its waveform and spectrum are shown below.

It can be clearly seen from the spectrum that 200~3000Hz The frequency band of Langqin Phantom T600X Its frequency response characteristics are very good, while in the low frequency part and the high frequency part, the distortion is relatively serious. As we all know, the frequency range that our human ears can hear is 20~20000Hz The most difficult part of ordinary audio equipment is the low-frequency part, because the lower the frequency, the greater the quality of speakers required. This is why traditional sound effects are equipped with a subwoofer with a large paper basin. The distortion of the high-frequency part should be caused by electrical noise. Therefore, Longqin should focus on this problem in the later period and solve it as soon as possible.

What about the frequency response of Xiaomi's Bluetooth audio? The following figure is a promotional image taken from Xiaomi's official website.

Xiaomi's official propaganda is 200~5000Hz In the frequency range of 200~300Hz There is still large distortion in the frequency band of. The high-frequency part is also good, because they deal with electrical noise better. Since they didn't test in person, they just express their own opinions.

Let's take a look at the hardware parameters of the two Bluetooth speakers, Longines Phantom T600X Built in box two individual 45mm Full band loudspeaker and two A combination of bass passive units, and Xiaomi Bluetooth speakers use dual 36mm Nd-Fe-B strong magnetic field unit. The speaker size of Xiaomi speaker is obviously larger than that of the phantom of the Longines T600X Little, this is also Longqin's phantom T600X The reason why it is better than Xiaomi speaker in low frequency.

Small arranger pairs the phantom of Longqin T600X The performance of audio Bluetooth mode playing music was also tested, music1 Direct use of mobile phone (model iphone 5S ）Play the collected audio signal, music2 It is through Langqin Phantom in Bluetooth mode T600X Play the collected signal. The waveform and spectrum of the signal are shown in the figure below.

It seems that the Bluetooth mode is not as stable as the external audio source mode, and the high-frequency part is seriously distorted. By the way, Xiaomi officially claims that the stereo loudness of Xiaomi speakers can reach 90dB I just want to say that my voice is only half loud during the test, and you can see that the sound pressure level has easily reached 90dB I won't say too much. Everyone knows.

four Summary

Well, that's all for the evaluation of the small editor. Thank you very much for the trial opportunities provided by Lei Feng.com and Longqin Company. Based on the test results and use experience, the editor also summarized the following personal suggestions, hoping to help Longines in its later product development:

one Internet products have paid more and more attention to their appearance. Proper attention to the design of product appearance while ensuring product quality will make products more popular. Therefore, I suggest Longines develop aluminum alloy shell series, which can be more bold and avant-garde in the use of colors, and can learn from the color matching of smart computers to design colorful series;

two Langqin Phantom T600X The unique light effect design is a highlight of the product, which is worth affirming. The later products can be retained, but LED The display pixel of is too low, I recommend changing it to LCD Glass display screen, equivalent will be better;

three Due to the requirement of portability, the sound design will not be too large, so the improvement of the sound quality of the low-frequency part will be costly and difficult T600X The low-frequency frequency response characteristics have been well done and need not be improved. However, due to the interference of electrical noise, the high-frequency sound quality has been seriously affected. I hope the company will do a good job in the future;

four In terms of software, the editor only found Langqin Phantom on Langqin's official website T600X Android app Due to the lack of Android devices, and some netizens have made relevant assessments, I will not say much about it here. Just hope Longines can join in later ios Version and flat app ；

five Another big regret is Lang Chin's phantom T600X It does not support networking and cloud play functions, nor does it support simultaneous control of multiple devices, which is also the phantom of Longines T600X Audio and O2 What is the gap between cloud audio and other products.