This is a professional stereo audio isolator specifically designed to address ground loop noise and long-distance signal transmission issues in multimedia systems. Under normal conditions, the shield voltage of audio or stereo signal transmission cables should be 0V. However, when ground loops occur, the voltage fluctuates around 0V, causing audio distortion, low-frequency humming, and high-frequency crackling from vehicle sparks. In severe cases, when transmission distances exceed 100 meters, high ground loop voltages may damage signal sources or receiving equipment, potentially endangering user safety. This product employs a built-in high-quality isolation transformer to achieve current isolation, effectively eliminating the aforementioned issues. It supports long-distance transmission (>100m without attenuation) and features a -20 dB attenuation DIP switch for convenient signal level matching. Combining a compact design with passive operation, it is suitable for home theater, automotive audio, professional PA systems, and broadcast environments.
| Category | Parameter Item | Parameter Description |
| Audio Performance | Channels | 2 (Stereo: Left/Right Independent Isolation) |
| Frequency Response | 20 Hz～80 kHz (±0.5 dB); Low-frequency optimized with no roll-off | |
| Total Harmonic Distortion (THD) | < 0.001% (1 kHz, 0 dBu input) | |
| Signal-to-Noise Ratio (SNR) | > 100 dB (A-weighted) | |
| Maximum Input/Output Level | +26 dBu (no attenuation); +26 dBu | |
| Impedance (Input/Output) | 600Ω / 600Ω (balanced) | |
| Phase Shift | < 0.5° (full frequency range) | |
| Isolation and Noise Suppression | Isolation Type | Current-isolated 1:1 audio transformer (600:600 Ω impedance ratio) |
| Isolation Voltage | > 4 kV (input/output); >1 kV continuous withstand voltage | |
| Ground Loop Noise Suppression | > 60 dB (50/60 Hz hum); >40 dB high-frequency interference (hiss) | |
| Maximum Transmission Distance | > 100 m (no significant attenuation, standard XLR cable) | |
| EMI/RFI Shielding | Metal shielded enclosure + internal filter circuit (>30 dB suppression) | |
| Attenuation Switch | -20 dB fixed attenuation (DIP switch: ON/OFF); 0 dB bypass mode | |
| Interfaces and Connectivity | Input Connector | 2 x XLR female connectors (gold-plated, balanced) |
| Output Connector | 2 x XLR male connectors (gold-plated, balanced) | |
| Compatible Adapters | 3.5mm TRS to RCA (optional); | |
| Cable Compatibility | Standard audio cable (RG-58 or better for long distances) | |
| Physical and Environmental | Dimensions (L x W x H) | 70 mm x 36 mm x 100 mm |
| Weight | 0.45 kg | |
| Enclosure Material | Metal housing, blue spray-painted | |
| Operating Temperature | 0°C～50°C | |
| Storage Temperature | -20°C～70°C | |
| Humidity | 5%～95% (non-condensing) | |
| Power and Safety | Power Requirements | None (passive design, no batteries or external power required) |
| Safety Features | Short-circuit protection; overvoltage protection (prevents damage from >100V ground loop voltage) | |
| Installation and Control | Mounting Method | Plug-and-play (input source → this device → receiving device) |
| Control Elements | Side DIP switch (-20 dB attenuation); | |
| Compatible Systems | Car audio, home stereo, professional PA, long-distance broadcasting |
400-900-2726
9th Floor, 1B, Shangzhi Technology Park, Guangming District, Shenzhen City, Guangdong Province, China
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