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Need help?Do you have a question about the DOUK AUDIO ONE Little Bear VU3 and is the answer not in the manual?
Details amplifier/speaker selection, pointer adjustment, and IR receiver on the front panel.
Illustrates rear panel connectivity for amplifiers, speakers, and DC power input.
Explains power, amplifier/speaker selection, LED, and brightness adjustment via remote.
Step-by-step guide for connecting power, amplifiers, speakers, and initial operation.
Provides crucial advice regarding power limits, usage modes, and power supply recommendations.
Addresses common user queries regarding VU meter behavior and remote control functions.
Lists detailed specifications including audio input/output, supported amplifier types, and dimensions.
Provides contact details for customer support and inquiries.
The DOUK AUDIO & One Little Bear VU3 is a versatile device that combines an analog VU meter with an audio amplifier/speaker switcher box, designed to enhance your audio experience with both visual feedback and flexible connectivity.
The primary function of the VU3 is to act as a multifunctional audio switcher, allowing users to connect and switch between different amplifiers and speaker sets. It integrates an analog VU meter, which provides a visual representation of the audio signal levels, adding an aesthetic and functional element to your audio setup. The device supports various amplifier types, including BTL, Class A, Class AB, Class B, Class D digital amplifiers, and tube amplifiers, making it compatible with a wide range of audio systems. It can handle power input and output up to 100W per channel, ensuring broad compatibility with most home audio setups. The VU3 operates in two main modes: 2-IN-1-OUT (two amplifiers to one speaker set) or 1-IN-2-OUT (one amplifier to two speaker sets), offering flexibility in how you configure your audio system.
The VU3 is designed for ease of use with both front panel controls and a remote control. To get started, simply connect the USB power cord to the DC 5V IN interface, and the unit will power on automatically. For remote control functionality, a CR2025 battery needs to be inserted into the remote's battery socket. You can connect two amplifiers to the "AMPLIFIER A" and "AMPLIFIER B" interfaces and two pairs of speakers to the "SPEAKER 1" and "SPEAKER 2" interfaces.
Switching between amplifiers and speakers is straightforward. You can freely select Amplifier A or B as input and Speaker 1 or 2 as output using the dedicated buttons on the front panel or the remote control. The remote control offers additional convenience, allowing you to power the device on/off, select amplifiers (A/B) and speakers (1/2), and adjust the backlight brightness of the VU meter. A "PEAK LED" button on the remote allows you to toggle the peak LED indicator on or off.
The analog VU meter features a "SWING-RANGE" knob on the front panel, which allows you to adjust the appropriate swing range of the pointer to achieve the best visual display effects for your audio signals. This ensures that the meter's movement is responsive and informative, regardless of the audio volume.
A notable feature of the VU3 is its ability to save all settings after shutdown. This means that when you power the device back on, it will recall your previously selected amplifier, speaker, and other settings, providing a seamless user experience.
The VU3 incorporates several features designed to protect your audio equipment and ensure the longevity of the device itself. All channels of the VU3 adopt a fully isolated design, with each group of GND (ground) being independent. This design minimizes mutual interference between channels, contributing to cleaner audio signals and better overall performance.
A critical protection feature is the built-in protection load. When an amplifier (A or B) is not selected for output, the VU3 automatically switches a built-in load to connect to that amplifier. This prevents the amplifier from running unloaded, which can be detrimental to its components and performance. This "amplifier no-load protection" provides perfect protection for your expensive amplifiers, ensuring they operate safely.
The device is powered by a standard DC 5V (Type-C) USB power supply, which should have a current of at least 1A or above. It is recommended to use a stable 5V power source and avoid fast-charging sources with dual voltages (e.g., 5V and 9V integrated fast charging sources) to prevent potential issues.
In case of troubleshooting, if the VU meter pointer moves without any music input, it might indicate a poor quality USB power supply with large ripples. The manual suggests changing to a better USB power supply to resolve this. If the output power of the amplifier is too large, causing loud noise, adjusting the "SWING RANGE" knob can help improve the situation. The device's backlight flashing when certain functions are selected via remote control is an original design feature and considered normal operation.
The VU3's robust design and protective features aim to provide a reliable and enjoyable audio switching and metering solution for various home audio setups.
General| Frequency Response | 20Hz - 20kHz |
|---|---|
| Input Impedance | 100kΩ |
| Power Supply | AC 100-240V |
| Dimensions | 160 x 100 x 120 mm |
| Weight | 1.5 kg |
| Input port | RCA |
| VU meter adjustment | Yes |
| THD | <1% |
| Type | Tube Amplifier |
| Output Impedance | 8Ω |
| Output port | 3.5mm headphone jack, speaker terminals |
| Signal-to-Noise Ratio | ≥80dB |
