Mobile phones have become the main equipment for listening to music. Most mobile phone decoding amplifiers are integrated into SoC, which is enough to directly push most low impedance earphones and earplugs. As for the actual sound quality effect, the earphones with slightly higher impedance are weak. Many users begin to pay attention to the quality of sound, so that some mobile phone manufacturers now, It is not uncommon to insert a slightly better independent audio decoding chip and operational amplifier chip into the mobile phone, and the results have been very good. The sound is indeed more than one grade higher than other mobile phones, but after all, there are not many mobile phones under the banner of HiFi, but more ordinary mobile phones, with an earphone to improve the music performance, At this time, some earphone amplifiers built for portable devices in the market attracted attention. Basically, the styles of different companies are very different, and the quality of different prices is also quite different. This time, Xiaosu will talk about the GR-1 portable earphone amplifier that Laisheng has made great efforts to build. First of all, I would like to thank you Love to play computer games Give me the opportunity to experience!

Due to the large size of the earphone, the packaging box is not small. Its volume is similar to that of an ordinary mobile phone packaging box. The packaging box adopts a simple white color design. The front of the box is printed with the appearance of the earphone product, and the model GR-1 is impressively printed on the lower right corner of the front.

Of course, there is also a close-up of the computer loving LOGO!

The back of the box is printed with the contact bar code and two-dimensional code of the product company. Only the introduction of the material and modeling of the shell is printed, without any main characteristics or parameters. Detailed configuration parameters are printed on the instructions.

After opening the outer packaging box, it can be seen that the inner part is mainly divided into two packaging parts. Foam is padded around the ear bud and the bottom layer to prevent damage caused by the vibration of the box during transportation. The gap between the protective foam and the host is very small, so it needs a little effort to remove it.

In addition to the Laisheng GR-1 earphone host, the accessories include a USB power cord, instructions, 3.5mm pair recorder, binding tape, and the Laisheng metal logo, which will not be introduced here. All accessories needed for daily use are included.

Lai Zhang has a close up of the Laisheng titanium metal logo, which has no real function and is only for commemorative purposes.

3.5mm pair recording wire is generally used for the connection between the output sound source and the ear amplifier. It is an integral part of the ear amplifier system. The whole wire is wrapped very tightly, and the internal metal wire can not be seen. At the same time, the diameter of the wire is also quite thick, which is quite powerful when held in hand.

In addition to paying attention to the external design of the wire, the design of the plug is also worth mentioning. The details of the contact pin after gold plating are to ensure the reduction of signal loss. The metal plug posts are quite exquisite, and the texture details are well designed. The plug diameter of the ordinary headphone cable plug should be thick and solid, which has improved the tensile strength of the wire to a certain extent.

This Laisheng GR-1 portable headphone amplifier is an earphone with extremely thick metal texture. The shell is made of zinc alloy. The metal touch of the shell is very delicate and comfortable. It looks good regardless of the fineness and delicacy of workmanship. The overall design style is extremely tough, with sharp edges and corners. The visual effect is enriched by prominent lines.

In addition to the design of a logo, there is no extra decoration on the front. The super cool water chestnut is just connected to the three corners of the logo, forming an integrated aesthetic feeling. The protruding part is metallic silver white, and the concave part is slightly turned to metallic silver gray. The whole shape is not so monotonous.

The design of the back surface is relatively simple. The logo of the earphone is directly and deeply printed on the shell, which makes the position more obvious. The flat and smooth surface mainly takes into account the binding party. The back and both sides of the edge are polished and smooth, without scratches, etc. At the same time, the user's mobile phone is also protected from scratches by the shell to the maximum extent.

In fact, the size of this earphone is quite large. The body circumference (length × width × height) is 100 * 75 * 20mm. Compared with Xiaosu's hands, it is not big, so I am not worried about carrying this size. On the contrary, I feel a sense of satisfaction because of its solid nature, but Xiaosu still recommends taking this earphone out of the street to use cross bag, otherwise it will be inconvenient to put the pocket.

From left to right on the top of the body, there are audio output interface, blue LED indicator, power switch dial key, audio input interface, and a volume adjustment knob, which does not support decoding function, so digital access, input of analog audio source can be said to be compatible, and it can be directly connected to mobile phone or computer and other audio sources, The output port marked OUT is connected to headphones or active speakers.

Leisheng GR-1 uses a specially customized volume potentiometer. I believe that you have been troubled by the rustling noise caused by adjusting the volume knob. When you turn the knob to adjust the volume, it is too delicate and there is no noise. Here, I would like to praise this volume adjustment knob, which is covered with serrations on the surface and anti slip in your fingertips.

The bottom panel is also very simple. There is only one Micro USB charging interface with its brand logo on the top of the socket, which can be used to connect the charger or computer USB for charging. It can replenish the power of the ear amplifier at any time. There is also a charging indicator on the left side. When charging, the red light will turn on and the blue light will turn on when it is fully charged.

The operation of the ear amplifier can not be separated from the battery power supply. In the actual test, it takes about 4.5 hours for the 2A output charger to shut down and charge, while it takes 5 hours to use the 1A output charger. The difference between the two charging times is half an hour. If it is necessary to connect the computer USB interface for charging, it will take longer.
Xiaosu uses a headphone with an impedance of 35 ohms and a sensitivity of 100dB/mW to play music continuously at normal volume. Through analog connection, the continuous playback duration is about 10 hours. This duration can basically meet the normal listening needs and can enjoy the music feast with ease.

Starting with the earphone means officially joining the bundling party, that is, using the ring bundling belt attached to the earphone to bind the whole set of traps between the earphone and the playback end, which is quite impressive in size. It takes courage to go out of the street directly in this way. Although this way will lose some portability, for users who want to pursue sound quality, It is undoubtedly worthwhile to compromise on portability, especially for Xiao Su, who carries a bag with him. This size is nothing at all.

Another feature of Raytheon GR-1 is its solid materials. It uses three independent op amp chips OPA2604, which is one of the most famous op amp chips in the industry, and plays a very important role in improving the thrust. This op amp chip has also been used in mobile phones, but only one is integrated. Then it uses ± 7.5V dual power supply to supply power. It is suitable for headphones with impedance of 16 ohm-300 ohm, With 112dB dynamic range, it can provide 150mW powerful driving force under 32 ohm load. It uses special filter capacitor to avoid voltage fluctuation and ensure the stability of sound output. Its performance is popular with music lovers. This earphone can be compatible with a lot of devices to change the sound quality played by computer devices, Compared with the two in one tablet, I feel that the sound quality of the computer has improved significantly, whether connected to the audio or the headset.

When it comes to the subjective audition, how can the sound be improved under such a large body? The music orientation of Xiaosu is omnivorous, and the electronic lyric rock likes it. In terms of earphones, the Sennheiser big steamed bun generation is used. This is the earphone I usually use when going out, so I have quite a understanding of its style. The sound audition part is a more subjective part, And the experience of different output sound sources is not the same. This time, we only compare the experience of different audio sources before and after they are connected to the earphone. Xiaosu is just for music lovers, not professionals, and everyone has different experience standards for sound quality. Do not spray if you don't like it.

First, the iPhone 6S is used as the output sound source. It may not be the phone with the best sound, but it is also not the phone with the worst sound quality. Although the average user has been satisfied with the sound performance of the iPhone, it still exposes shortcomings, especially for the low frequency, which is obviously lacking in strength. After accessing the Leisheng GR-1, the sound quality of the iPhone original sound is better, The performance of the bass part is enhanced, which makes people feel that the low-frequency is sufficient. The whole low-frequency is clear, powerful, and bounces back quickly. The resolution and delicacy are improved to a higher level, and the sound details are more fully displayed. The details that might have been erased in the original iPhone sound are retained. Compared with the performance before the earphone is connected, all aspects of the connection have a high degree of restoration, The improvement effect is great, and the function of the ear amplifier is really important.

This time, Xiaomi Note was used as the audio source for testing. This is Xiaosu's most frequently used direct push audio source device, which performs well in the case of direct push. In terms of high frequency, it is not satisfactory. In terms of audio quality, it can compare with other ordinary non HiFi phones. The difference before and after connecting the earphone is not as big as that of the iPhone, but there are some differences in details, After the connection, it is obvious that the sound field is stretched out. The overall sound effect is more three-dimensional, with a higher sense of encirclement and hierarchy. It is more mellow than the original warm sound. The medium and low frequency sound is full of volume, but there is no invincibility. It performs well in the analysis of highly rhythmic electronic sound, and the high frequency sound is slightly weak, Compared with the good performance of Xiaomi Note before the connection to the earphone, it performs better after the connection.

First of all, Raytheon GR-1 adopts an all metal appearance, which is very impressive, giving users a great visual impact, and has a good touch. The surface will not be cold in winter. It has a beautiful design and solid internal materials. It uses three independent firing level amplifier chips, which has significantly improved the sound quality, The middle and low frequency parts are most strengthened, with a sense of quantity and potential, which makes up for the weakness of ordinary output devices, and shows the true sound to its proper level, HiFi is even more powerful when it is put into the ear after receiving the mobile phone, leaving a deep impression on Xiaosu's listening sense. Because the use only supports analog input, and after the analog signal amplification and secondary processing, the sound quality is very dependent on the performance of the output sound source. A well matched output device will have a better effect. In addition, the sound taste is somewhat different, becoming warmer and richer, The most comfortable and pleasant thing to hear is good. You don't need to go too far in pursuit of high fidelity. Of course, if you want to pursue sound without distortion, you can also buy the front end with a lot of money. Other parts can't find big problems, and the price is very friendly. For friends who love music and want to improve the listening quality, this Laisheng GR-1 portable ear amplifier is really a good choice.

Advantages:
1. The design of the all metal shell is really cool, and the touch of the surface is comfortable but not cold.
2. The sound quality has been improved by more than one level, the sense of space is more clear, the improvement of middle and low frequencies is obvious, and the treble has a clear feeling.
3. The hardware materials are excellent. Three independent op amp chips OPA2604 are matched with dual power supply.
4. Long endurance, about 10 hours.
5. It can be charged while working, and connected to the computer can be charged using the USB 3.0 interface.
6. The property price is high. The price of the material and thrust 399 is very friendly to the people.
7. It is easy to access and can be used as long as there is a 3.5mm output interface.
Deficiencies and suggestions:
1. The charging speed needs to be improved. It takes about 4 hours to output 5V2A for charging.
2. The brightness of the power indicator is high. Using a slightly dim indicator can reduce light pollution and save power
3. It is recommended to add power below 20%. The power indicator flashes or turns red, indicating that the power is low.
4. Different amplification and output gain adjustable switches are added for bass enthusiasts.

Finally, I am very grateful for the experience opportunity offered by iGo, which made Xiaosu deeply impressed with this earphone of Lai Sheng. Ask Lai Sheng, do you plan to launch an earphone with decoding function? Xiao Su expressed interest in it.

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