Introduction
This manual provides comprehensive instructions for the PROZOR Bi-Directional 4-Way RCA Stereo Audio Switch Selector, Model VCB20. This versatile device allows you to easily manage multiple RCA analog audio sources and outputs, offering flexible 2-input/4-output or 4-input/2-output configurations without the need for external power. Its passive design ensures pure audio signal transmission.
Features
- Bi-Directional Functionality: Supports both 2-input/4-output and 4-input/2-output configurations.
- Passive Design: No external power supply or software required; plug and play operation.
- Compact and Durable: Sturdy, all-metal construction with a compact design suitable for desktops and offices.
- High Fidelity Audio: Supports analog signals up to 1.2V p-p I/O with an input/output frequency range of 20Hz~20KHz.
- Easy Switching: Features rotary switches for simple selection of audio sources or outputs.
Package Contents
- 1x PROZOR 4X2/2X4 Bi-Directional Audio Switcher
- 1x L/R Stereo RCA Cable (1.5m)
- 1x User Manual

The PROZOR audio switch, a 1.5m RCA stereo cable, and the included user manual.
Specifications
| Attribute | Value |
|---|---|
| Type | Audio Extension Cord / Switcher |
| Connector A | RCA |
| Connector B | RCA |
| Gender | Female |
| Shielding | Non-Shielded |
| Configuration | 4 Inputs / 2 Outputs or 2 Inputs / 4 Outputs |
| Application | Television, Amplifier, Computer, DVD Player, Game Console, CD Player, DAC, TAPE, TUNER, Tube Amplifier, Digital Power Amplifier, Headphone Amplifier |
| Input/Output Frequency Range | 20Hz-20KHz |
| Certification | CE |
| Package Type | Carton Box |
| Dimensions (L x W x H) | 99.5mm x 60mm x 38.5mm (approx. 3.91in x 2.36in x 1.51in) |
| Weight | 0.37 kg |

Diagram showing the length, width, and height of the audio switch.
Setup Instructions
The PROZOR Bi-Directional Audio Switcher offers flexible connectivity. Ensure all audio devices are powered off before making connections.
General Connection Overview

Detailed view of the rear panel with labeled IN/OUT A/B and OUT/IN 1/2/3/4 RCA ports.
1. 2-Input, 4-Output Configuration
This configuration allows you to connect two audio source devices and switch their output to one of four different audio output devices.
- Connect your first audio source (e.g., Digital Player) to the IN/OUT A RCA ports (Left and Right).
- Connect your second audio source (e.g., PC) to the IN/OUT B RCA ports (Left and Right).
- Connect your four audio output devices (e.g., Active Speakers, AMP, Tube AMP, Headphone AMP) to the OUT/IN 1, 2, 3, 4 RCA ports respectively (Left and Right for each).

Visual guide for connecting two input sources to four output devices.
2. 4-Input, 2-Output Configuration
This configuration allows you to connect four audio source devices and switch their output to one of two different audio output devices.
- Connect your four audio source devices (e.g., Digital Player, PC, CD, TV) to the OUT/IN 1, 2, 3, 4 RCA ports respectively (Left and Right for each).
- Connect your first audio output device (e.g., Active Speakers) to the IN/OUT A RCA ports (Left and Right).
- Connect your second audio output device (e.g., AMP) to the IN/OUT B RCA ports (Left and Right).

Visual guide for connecting four input sources to two output devices.
Important: Use high-quality RCA cables for optimal audio performance and ensure all connections are firm and correctly matched (red for right channel, white/black for left channel).
Operating Instructions
The PROZOR Bi-Directional Audio Switcher features two rotary switches on the front panel for easy selection.
- Input/Output Selection (Left Knob): Use the left rotary switch to select between inputs/outputs 1, 2, 3, 4, or set to 'OFF' to disable all connections.
- A/B Selection (Right Knob): Use the right rotary switch to select between input/output A or B.
Note: Only one input can be selected for each output playback. The product does not support multiple output devices to output sound simultaneously.
Demonstration video showing the PROZOR audio switch, its connections, and how to operate the rotary selectors.
Troubleshooting
- No Sound Output:
- Verify all RCA cables are securely connected to both the switcher and your audio devices.
- Ensure the correct input/output is selected using the rotary switches.
- Check that your source device is playing audio and its volume is turned up.
- Confirm that your output device (e.g., amplifier, speakers) is powered on and its volume is adjusted.
- Distorted or Low Sound:
- Ensure all cables are fully inserted and not loose.
- Inspect RCA cables for any damage or kinks.
- If the source signal is too strong, try reducing the volume on the source device.
- Only One Channel Playing (Left or Right):
- Check the Left (white/black) and Right (red) RCA connections on both the input and output sides of the switcher and connected devices. Ensure they are correctly matched and firmly seated.
User Tips
- Versatile Compatibility: This switcher is compatible with any device featuring L/R RCA audio outputs or inputs, including turntables (if they have L/R RCA outputs), game consoles, CD/DVD players, TVs, DACs, amplifiers, and more.
- Passive Speaker & Subwoofer Setup: You can use this switch to manage connections between multiple sets of passive speakers and subwoofers, provided they connect via RCA.
- Pure Audio: The passive design means no power is needed, which helps maintain the purity of the audio signal by avoiding potential electrical interference.
- Cable Quality: For the best audio experience, it is recommended to use high-quality RCA cables.
Maintenance
To ensure the longevity and optimal performance of your PROZOR Audio Switcher, please follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the exterior of the device. Do not use liquid cleaners or aerosols.
- Environment: Keep the device in a dry, dust-free environment. Avoid exposure to extreme temperatures, humidity, or direct sunlight.
- Handling: Handle the device with care. Avoid dropping it or subjecting it to strong impacts.
- Servicing: Do not attempt to open, disassemble, or repair the unit yourself. This could void any warranty and may cause damage to the device.
Warranty and Support
For detailed warranty information, technical assistance, or customer support regarding your PROZOR Bi-Directional 4-Way RCA Stereo Audio Switch Selector, please refer to the seller's official website or contact their customer service directly. Keep your purchase receipt as proof of purchase for any warranty claims.






