1. Introduction
The Nobsound NS-05 PRO is a high-fidelity bi-directional audio converter designed to seamlessly transform RCA (unbalanced) signals to XLR (balanced) and XLR signals to RCA. This device facilitates the integration of consumer Hi-Fi equipment with professional audio systems, offering flexibility and compatibility. It features true balanced circuitry for superior noise reduction and independent volume control for each conversion path.
2. Features
- Bi-Directional RCA & XLR Conversion: Seamlessly transforms RCA (unbalanced) to XLR (balanced) and XLR to RCA, bridging consumer Hi-Fi gear with professional audio equipment in either direction.
- True Balanced Circuitry for Pristine Sound: Upgrades RCA signals to true balanced XLR, eliminating unwanted electrical hum, buzz, and ground loop noise for a cleaner, more detailed sound with improved signal integrity.
- Dual-Path with Independent Control: Two fully independent conversion paths operate simultaneously without interference. Each path has its own volume knob, acting as a mini-preamp for precise level matching.
- Complete Audio Compatibility: Effortlessly integrates devices such as mixers, audio interfaces, active studio monitors, power amplifiers, and DACs, ensuring stable, high-quality signal transmission for both home stereo setups and advanced audio systems.
- Premium Aluminum Build: Crafted from a solid, compact aluminum chassis, providing robust shielding against external interference for pure signal transmission.
3. Package Contents
Please check the box for the following items:
- 1x Nobsound NS-05P PRO Converter
- 1x USB Cable
- 1x User Manual
4. Product Overview
4.1 Front Panel Controls
- Volume Knob (XLR input → RCA output): Adjusts the output level for the XLR to RCA conversion path.
- Power Button: Turns the device on or off.
- Volume Knob (RCA input → XLR output): Adjusts the output level for the RCA to XLR conversion path.
4.2 Rear Panel Ports
- XLR Output: Balanced audio output for the RCA to XLR conversion.
- RCA Input: Unbalanced audio input for the RCA to XLR conversion.
- RCA Output: Unbalanced audio output for the XLR to RCA conversion.
- XLR Input: Balanced audio input for the XLR to RCA conversion.
- DC 5V IN (≥1A): USB Type-C power input.
- GND Terminal: Ground terminal for connecting to an earth ground or metal chassis to reduce hum.
5. Setup Instructions
- Power Connection: Connect the provided USB cable to the DC 5V IN (Type-C) port on the rear panel of the NS-05P PRO. Connect the other end to a DC 5V power adapter (minimum 1A, not included). The NS-05P PRO is an active converter and requires power to function.
- Audio Input Connection:
- For RCA to XLR conversion: Connect your RCA source device (e.g., CD player, DAC) to the RCA Input ports on the rear panel.
- For XLR to RCA conversion: Connect your XLR source device (e.g., mixer, audio interface) to the XLR Input ports on the rear panel.
- Audio Output Connection:
- For RCA to XLR conversion: Connect your XLR receiving device (e.g., active studio monitors, power amplifier) to the XLR Output ports.
- For XLR to RCA conversion: Connect your RCA receiving device (e.g., Hi-Fi amplifier, receiver) to the RCA Output ports.
- Ground Connection (Optional, for noise reduction): If you experience hum or background noise, connect a wire from the GND terminal on the rear panel of the NS-05P PRO to a real earth ground or to the metal chassis of another audio component in your system.
- Power On: Press the Power Button on the front panel to turn on the device.
Important Note:
- The NS-05P PRO does not support RCA-to-RCA or XLR-to-XLR connections. Ensure your connections match the intended conversion path (RCA IN → XLR OUT or XLR IN → RCA OUT). Incorrect connections will result in no signal output.
- The two conversion paths (RCA to XLR and XLR to RCA) operate simultaneously and independently.
6. Operating Instructions
- Power On/Off: Use the Power Button on the front panel to switch the device on or off.
- Adjusting Volume:
- Use the left volume knob to control the output level of the RCA input → XLR output path.
- Use the right volume knob to control the output level of the XLR input → RCA output path.
Each knob acts as an independent mini-preamp, allowing precise level matching between your connected components.
- Simultaneous Operation: Both conversion paths can operate simultaneously without interference. You can use the NS-05P PRO to convert RCA to XLR and XLR to RCA at the same time for different audio signals.
7. Troubleshooting
- Q: Why is the NS-05P PRO not working?
- A:
- The NS-05P PRO is an active converter and requires a DC 5V (≥1A) power supply. Please ensure the power supply is connected and functioning correctly.
- Verify that the RCA and XLR ports are connected correctly. The left side of the device handles RCA input to XLR output, and the right side handles XLR input to RCA output. The device does not support RCA-to-RCA or XLR-to-XLR connections. Incorrect connections will result in no signal output.
- Q: Why does the output volume of NS-05P PRO differ in RCA-to-XLR and XLR-to-RCA modes?
- A: When the volume knob is turned to maximum, the XLR-to-RCA mode provides a maximum gain of +5dB, resulting in a louder output. In RCA-to-XLR mode, the maximum gain is 0dB.
- Q: What should I do if I hear hum or background noise when using the NS-05P PRO?
- A: Please use a wire to connect the GND terminal on the NS-05P PRO to a real earth ground or to the metal chassis of another piece of equipment in your audio chain. If the issue persists, please contact customer support for further assistance.
8. Specifications
| Parameter | Value |
|---|---|
| Brand | Nobsound |
| Model | NS-05P PRO |
| Audio Input | RCA / XLR |
| Audio Output | XLR / RCA |
| Work Modes | RCA IN→XLR OUT / XLR IN→RCA OUT |
| Power Required | Yes |
| Gain (XLR→RCA) | 5dB |
| Gain (RCA→XLR) | 0dB |
| THD+N | 0.008% |
| THD | 0.00007% |
| SNR | ≥89dB |
| Channel Balance (L/R) | ≤0.01dB |
| Frequency Response | 20Hz-20kHz |
| Input Impedance | 20kΩ |
| Output Impedance | 100Ω |
| RCA Output Level | 2Vms (max) |
| Separate Volume Control | Supported |
| Input Voltage | DC5V (≥1A) |
| Power Interface | USB Type-C |
| Dimensions (W*D*H) | 155*70*42mm / 6.10*2.76*1.65in |
| Net Weight | 420g / 0.92lb |
| Package Weight | 600g / 1.32lb |
9. User Tips
- Power Supply: Always use a stable DC 5V power supply with at least 1A output to ensure optimal performance and prevent unexpected shutdowns.
- Grounding for Noise: If you encounter any hum or buzz, utilize the GND terminal on the back of the unit. Connecting it to a common ground point in your audio system can significantly reduce noise.
- Volume Matching: Take advantage of the independent volume knobs for each conversion path to precisely match audio levels between different components in your setup, preventing sudden volume changes or clipping.
- Cable Quality: Using high-quality RCA and XLR cables can further enhance signal integrity and minimize potential interference.
10. Warranty and Support
For warranty information, technical support, or any inquiries regarding your Nobsound NS-05 PRO, please contact the manufacturer or your point of purchase. Keep your purchase receipt as proof of purchase.
