Audition method: directly photograph the new baby, we will ship it normally, and audition7Within days, if you like it, you can stay, if you don’t like it, you can support a full refund without reason(We are responsible for the shipping cost, only the return shipping cost of the machine.（Pay attention not to scratch the appearance to affect the secondary sales.）Welcome to join the q group to discuss consultation:Lingyin HIFI audio 302220345.

MG2 has been launched for more than 4 years, and it is still loved by many fans. The classic has always stood the test of time. It has a unique sound charm……

It supports listening while rushing, and the battery life is 8-9 hours.

Overall dimensions: width 7.1 cm, length 13.5 cm, thickness 2.5 cm. Weight: 0.25KG

Free shipping SF.

The default gain is up to 5 times! Push middle and low resistance（16-600 Euro）,With a gain of 5 times, 300 ohms can output 0.4W, 600 ohms impedance can output 0.2W,

For maximum gain（3 times）!Push middle and low resistance（16-250 Euro）ofPlease contact customer service to orderOr leave a message.

When the maximum gain is 5 times version, the gain step is1, 3, 5.

When the maximum gain is 3 times version, the gain step is1, 2, 3.

Maximum gain refers to: when the knob is adjusted to the maximum, the output（Relative to）Enter the magnification factor

（The actual volume is adjusted by the knob, and the maximum gain only determines the maximum output）

For specific gain adjustment, please see the adjustment diagram at the bottom below.

Mono peak output current can reach 0.25A,

For the noise, please see the test chart below, I won''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t say much, in short, the low noise is very low.

Better promotion, detailed improvement

MG2''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s low battery reminder function

When the battery power is less than 30%, the indicator light changes from a steady light to flashing to remind you that it is time to charge.

Precautions for using MG2

 Don’t plug in the charger to start when the MG2 is completely out of power, because the start-up current of MG2 is above 1.5A, and the maximum output current of the charger is only 1A, so you can’t pass the charger when there is no power at all. Oh, it''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s activated. The correct approach is: you should charge for 5 minutes before starting（Battery assisted start）

 In cold and dry seasons, do not disassemble or replace the op amp at will, because static electricity will easily penetrate the MG2 chip and cause direct damage. If you want to get it, it is recommended to wear an electrostatic bracelet and connect it safely. Earth.

 In order to fully activate capacitors and resistors and other devices, it is recommended to charge the machine for 8 times.

 MG2 can be returned if you are not satisfied within 7 days. If you are not sure, please be careful not to scratch it. If you want to return the product, you must return it with free shipping.

 Friends who need to replace the discrete card or adjust the gain can use the M2 hex screwdriver to loosen the top 4 shell screws of the MG2. At the same time, in order to take out the top shell easier, you need to loosen the other 2 shell screws at the bottom of the rear panel. A little bit, you can only operate after removing the top box. If you don’t know how to replace and operate, please contact customer service.

MG2''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s power supply design

 MG2 uses dual 15V voltage power supply. The higher the voltage, the lower the distortion rate. When testing the distortion rate in the same industry, the amplifier outputs a voltage of 1V to test. The distortion rate tested in this way will of course be very low, but the headset Most of them are output voltages above 1V, and our distortion test voltage is 5V. Some even mess up the distortion rate to fool fans.

Frequency response spectrum test of MG2

 The frequency response range of MG2: 2Hz-72KHz (-3dB), very beautiful response curve

The test chart equipped with 627 operational amplifier is as follows: Distortion rate <=0.00557%

The test chart equipped with the discrete card FL1 is as follows: Distortion rate <=0.00883%

（Although the open-loop gain is only 40 times, the distortion rate has not increased much, and the even harmonics are rich, which is very natural and comfortable.）

Material selection of MG2

The bypass capacitor of the op amp uses Japan''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s Nikon plus WIMA, which creates a great reserve force for the play of the op amp!

In order to have less transmission loss and more idealization, WIMA capacitors are selected;

MG2 working mode

For the sound quality, we turned on the Class A broadband mode of BUF634, which has a certain amount of heat under plus or minus 15V, and the temperature of BUF634 can reach 68 degrees at 30 degrees; the shell will be warm in actual use!

MG2 battery selection and protection

For this reason, the Japanese Panasonic 18650 high-capacity lithium battery is selected. Each cell has a capacity of 3400mAH and is supplied in series; it has an independent protection circuit and a current sharing function, so that you can use it with peace of mind and use it at ease! In order to make the contact better, the shrapnel of the battery box has been removed, and the single crystal copper silver-plated wire is directly used for welding!

MG2 default shipping configuration

Host and a charger,You need to purchase separately for the recording line! Unsatisfactory return at any time within 7 days, lifetime warranty, so you have no worries! , The discount of 100 yuan for buying MG1. Each MG2 undergoes a cycle aging before it is sent out! If you have any questions, please contact customer service. Thank you.

The gain is adjusted as follows

The adjustment of the maximum gain of 3 times is as follows:

The gain adjustment of the maximum 5 times gain version is as follows:

Rice has something to say: I am an electronic engineer who loves music.Do it with a rigorous attitude, so use a lot of equipment to test performance and assist design.I don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t like to judge good or bad by ear alone. Many things are relative. If an engineer has not even heard of decent equipment, what would he use as a reference to say it sounds good? Although I have not listened to tens of thousands of devices, I have a man’s HIFIMAN901 as a sound reference, and the tuning headphones in my hand are K701\HD650\HD800. But I''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''m not limited to this. I will also send it to audiophiles who have German decoders and other expensive foreign equipment to listen to as a reference for tuning.（Headphones, everyone, and other places have the evaluation of senior great gods, friends can copy the link and take a look, for reference only:http://www.erji.net/read.php?tid=1791375&page=1&toread=1）

That''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s why there will be rave reviews. Sometimes I think about 100 yuan can make a HIFI-level headphone amplifier? I tried to do it, because it is very expensive to make a niche HIFI custom case, not as large as a mobile phone. In this way, the remaining circuit without the cost of the casing and battery must be extremely simplified, and the circuit does not meet the performance standard., The materials used must be extremely cheap, can the equipment produced in this way be called HIFI? I''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''m afraid it was fooling people. Sometimes the more incompetent people like to boast.

Do headphones really need an amp? The most important parameter of the earphone unit we listen to is the impedance, but in addition to the inherent impedance, the earphone also has factors such as magnetic field and inertia. In addition to the power consumption of the impedance, the earphone needs a lot of power to counter the inertia, which is equivalent to driving. , Any car can run to a speed of 100Km/h, and most of the time it runs at a speed of less than 200 per hour. Why do you want to increase the horsepower to make a car that can accelerate from 100 kilometers to 3 seconds? This is the same reason, even though they are all driving（listen）, But it feels different.

Compared with some amps on the market that use low-voltage power supply and have to remove the battery for charging, the MG2 is obviously not that cumbersome! Some people say that the sound of switching power supply equipment is not good. As far as I know, HDVD800 uses switching power supply! Sony’s amp is also …… Why do they say no? After all, the technology has not passed the test, even if it is battery-powered, they can''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t suppress the noise problem, let alone use switching power supply, and many of them don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t do switching power supply design, they just copy other people''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s circuits and modules. To be used as a power source for audio, it must be precisely calculated and designed ……Many colleagues can''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t eat grapes and say grape sour! The high voltage can also make the circuit work in the best condition, just like the desktop adopts high voltage.