Color Classification: VU2-L Bulb Type-WhiteVU2-D LED Type-BlackAfter the first VU1 level meter went on the market, we received feedback from many buyers. Most of the opinions were that the VU1 header size was too small. It is strongly recommended to have a large meter header. So, according to the good suggestions of these enthusiastic buyers, After more than 3 months of new design and development in our store, VU2 is finally on the shelves.VU2 has more functions. Novices may feel a little overwhelmed. By default, this machine has set the mode to the most commonly used mode. Buyers only need to turn the DELAY and GAIN knobs to their favorite beating speed. VU2 is a multifunctional VU level meter, which integrates the functions of 4-channel audio switcher + double large VU meter head level meter, which can meet the needs of most buyers. With the development of the times today, I believe that most buyers’ audio devices generally have at least two audio sources: computers, mobile phones, professional DACs, digital turntables, etc. Many of these devices have a few of them. If a VU meter has only one input, it is very inconvenient to change the audio source. Therefore, VU2 adds a 4-channel audio switcher on this basis, and buyers can easily connect to multiple audio sources to share a set of large VU level meters to display music bounce effects. It is no longer necessary to re-plug and unplug cables, which is very convenient to manage your audio system. It also supports remote control selection, which is simply a boon for lazy people.In addition to the basic single channel switching function, the function of the 4-channel audio switcher (that is, only one channel can work at the same time), it also supports the simultaneous working mode of all channels: that is, 4 passes can work in parallel at the same time, if you input 4 at the same time Channel audio signal, (4 in 1 out mode) then 4 channels of signals can be set to output to the I/O channel at the same time to achieve the purpose of mixing. If it is (1 in 4) out, then it is possible to output an audio signal to multiple devices at the same time, which is often used in recording or monitoring. The I/O port is connected to the player, and the other 4 groups of signals are simultaneously output to each device, one group is input to the computer for recording, one group is output to the amp, and one group is output to the monitor speakers. The setting method is also simple. Press and hold the channel key that needs to work at the same time for 2 seconds until the channel's light is on. Press the buttons of which channels to work at the same time.Note here: It is only recommended to use the parallel output function when 1 input and 4 output. That is, connect 1 player and connect 4 different outputs. (It is not recommended to use the parallel function when 4 input and 1 output, which may cause sound distortion.) All input and output interfaces are all copper and long gold-plated RCA interfaces, with excellent electrical performance, large contact surface, and minimal signal loss. Uncommon RCA interfaces are comparable. Buyers can compare after receiving the goods. Good materials can guarantee good Sound quality. The main point of the painting: in order to maximize the potential of the VU meter. In the design of this machine, the shop owner’s original dynamic acceleration and deceleration damping modes have been added, which can make the pointer beating better. In addition, the most commonly used and most practical functions are directly designed in front of the panel, so that everyone can quickly set to the best working state. These functions are: DELAY (used to set the speed of the pointer jumping, you can adjust it to an appropriate speed according to the speed of the music. It will be better visually. Tips: slow the music with slow rhythm, and adjust the rhythm faster. All settings are Real-time display, and the reference signal is the input audio signal, please be sure to input music when adjusting.) GAIN (used to set the gain of the input signal. It is specifically stated that this GAIN setting is not used to adjust the audio through the resistance attenuation of the input signal with a potentiometer. This method will affect the audio source somewhat. It is adjusted by the internal digital adjustment of the microcontroller. Yes. The GAIN potentiometer has no physical contact with the input audio signal. So the effect on the audio signal is 0, which belongs to the digital gain. Through this GAIN knob, you can set the pointer beating range. If the input signal is too small, you can increase it appropriately. If the signal is too large, you can also reduce it appropriately. In short, you can set the meter pointer in an optimal range. In addition, for some friends who need to record, you can also set your own 0dB position. Convenient monitoring Recording volume) VU meter function keys: Click -> Choose the VU meter audio input method, there are two types: microphone pickup / LINE IN, the buyer may choose the best method according to the actual situation. It is recommended to use the LINE IN method if accurate display is required. This display is the most direct and true. If it is not convenient to connect the cable, you can choose MIC mode. Double-click -> select the gain mode as DB or ACG, the difference between the two is explained in detail in the figure below. It is recommended that ordinary users choose ACG, which has the best beating effect. If you need to use it in a recording studio or special occasions, you can choose DB. Turn on/off the dynamic damping mode: It can only be set via the remote control. The method is as follows: first press the MUTE button on the remote control, and then press the ACG/DB button. At this time, the ACG/DB LED will flash to indicate that this function is turned on or off. When setting, music is playing at the same time, and the DELAY and GAIN knobs are turned to at least 50%, you can clearly distinguish the difference between the two modes from the music swing rhythm. After selecting the mode, press MUTE to exit the setting.In order to cater for the needs of various fans, VU2 also provides two model options: VU2-D (black background head + LED white backlight) is a fashionable model, and many famous phones currently use this white light and black background. VU2-L (white background head + tungsten bulb orange backlight) classic style, the most popular style in the 80-90s. Nostalgic friends can choose this styleThis machine is powered by the USB interface, which is convenient to get power. It can be connected to any USB charger. The USB only supplies power to the driver board and has no interference to the audio input and output circuits. The functions of VU meter and 4-way switch are independently controlled. The VU meter only reads the signal from the I/O port of the switch, and does its best to ensure that the sound quality is not affected Product parameters:Size: 28 length * 12 width * 9 height CMVU meter audio input mode: support stereo RCA or microphone pickup mode.Audio output: 4 stereo RCAWorking voltage: Micro USB, DC 5V 0.5A (VU2-D), DC 5V 1.5A (VU2-L)Backlight filament voltage: DC / AC 6-12V 100mA (only for VU2-L bulb models)Backlight filament current: 10mA (only for VU2-D models)Remote control function: support.Switcher working mode: 1 in 4 out or 4 in 1 outPointer sensitivity adjustment: support manual quick adjustmentGain adjustment: Support manual quick adjustment.Gain mode: DB or ACG. (Note: DB is generally used for recording occasions, ACG is used for most common occasions)Dynamic acceleration, deceleration damping mode: supportSwitch function: supportSet power-off save: supportMute function: support (Note, if the switch is working in 1 in 4 out, the meter will keep beating in silent mode, and in 4 in 1 out mode, the meter will stop when silent.) ACG and DB mode description: 1. In ACG mode, the VU meter is driven by an exponential compression algorithm, which means that the relationship between the input volume and the pointer swing is not proportional. It can be seen from the relationship diagram that when the input volume is small, the swing range of the pointer is larger, and when the volume gradually increases, the swing range of the pointer gradually becomes smaller. In this mode, the user can use the VU meter within a larger audio input range without adjusting the gain, and can obtain a good display effect at the same time. When the pointer jumps with the music, even if the volume input is too small, the pointer will jump, even if the volume input is large, it will not reach the maximum swing. It is recommended to adjust GAIN to make the pointer swing as close as possible to 0dB. Because it uses an exponential compression algorithm to drive the pointer, it cannot truly display the current DB level of the input volume, which is not suitable for professional recording occasions. But this mode is suitable for people's regular hearing habits. Because the human ear hears the sound and the loudness of the sound has a ratio, not 1:1. For example: a 20W speaker and another 100W speaker, their power ratio is 5 times, if the meter actually jumps. That is, there should be 5 times the angle change. But the human ear does not sound like this, people only feel that the sound is only about 2 times different in loudness. That is, the sound of the 100W speaker seems to be only about 2 times louder than the 20W speaker (meaning that the 100W speaker has only 40W, which is not the case). This is the actual difference, so in this case, if the pointer jumps At about 2 times, human vision and hearing can match. Feeling more comfortable. But if it jumps according to the real value. The pointer jumped 5 times the angle, which caused the sensory misalignment, which made it relatively uncomfortable. (Only for some people, not all situations.) 2 In the DB mode, the VU meter pushes the pointer to jump after the standard AD conversion. The data has not undergone any changes and is the most original. So the swing of the pointer is proportional to the input signal. For example (not actual test data): If the audio signal input 0.1V pointer swing angle is 10 degrees, then input 0.7V. The pointer will swing 70 degrees. In this mode. The beating of the signal and the pointer is 1:1 true. For some occasions where you need to know the real music level, such as a recording studio or testing a certain sound level. You can choose this mode.――――――――――――――――――――――――――――――――――――――――Other matters needing attention: When setting the sensitivity, there must be music input. Otherwise, the pointer will not jump. It is impossible to see the actual effect of the current setting value. Double-click and single-click function keys. Operate at the speed you normally use when operating the computer. When you click to select, there will be an appropriate delay, which is designed by the program. This is normal. When using the microphone to pick up the sound, according to the sound playback volume or the distance of VU1 from the sound. Properly adjust the GAIN knob to get a better beating effect. It is recommended to use a separate USB charger for power supply instead of the USB on the audio machine. For example, after connecting the computer audio source, use the computer USB. It is not recommended to do this, because it is easy to generate common ground noise. packing list: 1 finished host 1 USB power cord, without power supply 1 remote control 1 manual