Nobsound VU3PRO Audio Selector Speaker Switcher User Manual

1. Introducció

The Nobsound VU3PRO is an advanced 2-input, 2-output audio selector and speaker switcher designed to enhance your audio experience. It features large VU meters for visual feedback, supports high power output up to 350W, and includes dedicated protection for vacuum tube amplifiers. This manual provides detailed instructions for setup, operation, and maintenance of your VU3PRO unit.

Figure 1: Nobsound VU3PRO with 2-input, 2-output configuration. Two speaker groups can operate simultaneously.

2. Configuració

2.1 Contingut del paquet

• 1 x VU3PRO Audio Selector Speaker Switcher
• 1 x adaptador de corrent
• 1 x comandament a distància (piles no incloses)
• 1 cable USB (tipus C)

Figure 2: Included accessories and the VU3PRO unit.

2.2 Connexions

Ensure all audio equipment is powered off before making connections.

1. Ampentrada de lifier: Connecteu el vostre amplifiers (e.g., Ampvidador A i Amplificador B) al corresponent "AMPLIFIER" input terminals on the rear panel of the VU3PRO. Use high-quality speaker cables.
2. Sortida de l'altaveu: Connect your speaker sets (e.g., Speaker 1 and Speaker 2) to the corresponding "SPEAKER" output terminals. Ensure correct polarity (+ to + and - to -).
3. Connexió d'alimentació: Connect the provided power adapter to the DC 5V input (Type-C) on the rear panel and then to a power outlet.

Figure 3: Detailed connection diagram for amplificadors i altaveus.

The VU3PRO supports high power output up to 350W per channel and is compatible with various amplifier types including BTL, Class A, Class D, and vacuum tube amplifiers. Pure copper speaker terminals and AC250V 5A relays are used for reliable high-current transmission.

Figure 4: High-quality speaker terminals and 350W power handling capability.

3. Instruccions de funcionament

3.1 Controls del panell frontal

• Power Switch / MIC Mode: Press to power on/off. Long press to activate/deactivate microphone pickup mode for the VU meters.
• Amplifier A/B Switch: Selecciona entre Ampvidador A i AmpEntrades del lifier B.
• Speaker 1/2 Switch: Selects between Speaker 1 and Speaker 2 outputs. Both outputs can operate simultaneously.
• Mando GAIN: Ajusta la sensibilitat dels VU-metres (20 nivells).
• Botó SENS: Adjusts the response speed and swing range of the VU meters (30 levels).

3.2 Funcionament del control remot

The included remote control allows convenient operation from a distance. Ensure batteries are inserted (not included).

• Botó d'encesa: Encén o apaga la unitat.
• MIC Button: Toggles microphone pickup mode.
• Botó COLOR: Cycles through 35 backlight colors for the VU meters.
• Botó LLUM: Adjusts the brightness of the VU meter backlight (5 levels).
• Botó A/B: Canvia entre Ampvidador A i AmpEntrades del lifier B.
• Botó 1/2: Canvia entre les sortides de l'altaveu 1 i l'altaveu 2.
• 1+2 Button: Activates both Speaker 1 and Speaker 2 outputs simultaneously.

Figure 5: Using the remote control for convenient operation.

3.3 VU Meter Customization

The VU3PRO features large 85mm VU meters with extensive customization options:

• Colors de contrallum: Choose from 35 different backlight colors to match your mood or environment.
• Nivells de brillantor: Adjust the backlight brightness with 5 available levels.
• Ajust de guany: Fine-tune the meter's sensitivity with 20 levels to accurately reflect your audio signal.
• Ajust de sensibilitat: Control the needle's response speed and swing range with 30 levels. Turning the SENS knob counter-clockwise increases the swing range by slowing the needle's return speed.

Figure 6: Customizable VU meters with multiple backlight colors.

Figure 7: 20-level gain adjustment for precise meter calibration.

Figure 8: 30-level sensitivity adjustment for meter response.

Figure 9: 5-level brightness adjustment for the VU meter backlight.

Figure 10: 35 backlight color options for personalized aesthetics.

4. Característiques

• Disseny per estalviar espai: Compact unit (26.8cm width) allows easy integration into existing audio setups, providing flexibility to switch between multiple amplifiers and speakers without re-cabling.
• High Power Compatibility: Supports up to 350W per channel, ensuring stable operation with modern high-end amplifiers (e.g., TPA3255) and large floor-standing speakers. Compatible with BTL, Class A, Class D, and other amplification methods.
• Visual Audio Feedback: Large 85mm VU meters with 35 backlight colors and 5 brightness levels provide dynamic visual representation of your audio.
• Microphone Pickup Function: Built-in microphone allows the VU meters to visualize sound levels even without direct speaker connection, useful for monitoring subtle audio cues like record needle drops.
• Tub de buit Amplifier Protection: A patented HL current sensor prevents overload. A specialized dummy load circuit automatically generates an 8Ω virtual load if the switch is left on without speakers, protecting valuable vacuum tube amplifiers from no-load damage and transformer overheating.
• Fiabilitat a llarg termini: Features pure copper speaker terminals and AC250V 5A relays to prevent contact welding during high current transmission, ensuring over 10 years of reliable performance. The circuit board is coated with a moisture-proof layer to prevent performance degradation in humid environments.
• Professional-Grade Accuracy: Meets broadcast industry standards with a frequency response of 30Hz-20kHz ±1dB, ensuring precision for both hobbyist and professional applications.

5. Manteniment

To ensure the longevity and optimal performance of your Nobsound VU3PRO, follow these maintenance guidelines:

• Neteja: Use a soft, dry cloth to clean the exterior of the unit. Avoid using liquid cleaners or abrasive materials, as they may damage the finish or internal components.
• Col·locació: Place the unit in a well-ventilated area, away from direct sunlight, heat sources, and excessive moisture. Ensure there is adequate space around the unit for proper airflow.
• Connexions: Periodically check all cable connections to ensure they are secure. Loose connections can lead to signal loss or degraded audio quality.
• Apagar: Always power off the unit and disconnect it from the power source before performing any cleaning or maintenance.

6. Solució De Problemes

• Sense sortida de so:
  • Check if the VU3PRO is powered on.
  • Comproveu que sigui correcte amplifier input (A or B) and speaker output (1 or 2, or 1+2) are selected.
  • Ensure all audio cables are securely connected to both the VU3PRO and your audio components.
  • Confirmeu que el vostre ampEls amplificadors i els altaveus estan encesos i funcionen correctament.
• VU Meters Not Moving or Moving Minimally:
  • In wired input mode, if the audio signal has low bass components or is at a low volume, the VU meter needle movement may be less pronounced. This is normal behavior.
  • Adjust the GAIN knob clockwise to increase the meter's sensitivity.
  • Adjust the SENS knob counter-clockwise to increase the meter needle's swing range.
  • Ensure the MIC mode is off if you are using wired input.
• El control remot no funciona:
  • Check if batteries are inserted correctly and are not depleted. (Batteries are not included in the package).
  • Ensure there are no obstructions between the remote control and the VU3PRO's IR receiver.
• Àudio distorsionat:
  • Ensure that the total power output of your amplifier does not exceed the VU3PRO's 350W per channel limit.
  • Check all cable connections for proper seating and integrity.
  • Reduce the volume level from your amplificador o dispositiu font.

7. Especificacions

8. Garantia i Suport

The Nobsound VU3PRO comes with a Garantia del fabricant de 1 anys des de la data de compra. Aquesta garantia cobreix els defectes de materials i de mà d'obra en ús normal.

For technical support, troubleshooting assistance, or warranty claims, please contact Nobsound customer service through the retailer where you purchased the product or visit the official Nobsound weblloc per obtenir informació de contacte.

Si us plau, conserveu el comprovant de compra per validar la garantia.