This is a professional dual-channel passive impedance converter (Direct Box) designed for live performances, recording studios, and AV system integration. Featuring dual professional-grade audio transformers, it enables seamless conversion from high-impedance unbalanced inputs to low-impedance balanced outputs. Supporting stereo signal processing, it effectively eliminates ground loop noise and EMI interference, ensuring distortion-free transmission over long cable runs (>100 meters). Built-in active attenuators and floating ground functionality facilitate matching high-output sources such as keyboards, synthesizers, and active instruments. Offering an exceptional balance of durability and audio fidelity, this unit is ideal for professional musicians and sound engineers.
| Category | Parameter Item | Parameter Description |
| Audio Performance | Channels | 2 (Stereo Independent Channels) |
| Frequency Response | 20 Hz～20 kHz (±0.5 dB); No Phase Deviation | |
| Total Harmonic Distortion (THD) | < 0.005% (1 kHz, 0 dBu Input) | |
| Signal-to-Noise Ratio (SNR) | > 110 dB (A-weighted) | |
| Maximum Input Level | +26 dBu | |
| Maximum Output Level | +20 dBu (XLR Balanced) | |
| Impedance Ratio (Input/Output) | Input: 10 kΩ (high impedance); Output: 600 Ω (low impedance balanced) | |
| Phase Shift | < 0.5° (full frequency range) | |
| Dynamic Range | > 135 dB | |
| Isolation and Noise Suppression | Transformer Type | Dual professional-grade 10:1 audio transformers (nickel core, Faraday shielded) |
| Isolation Voltage | > 1.5 kV (input/output) | |
| Ground Loop Noise Suppression | > 60 dB (50/60 Hz); > 40 dB EMI/RFI | |
| Maximum Transmission Distance | > 100 m (balanced XLR cable, no noticeable attenuation) | |
| Ground Lift | Ground loop hum elimination | |
| Interfaces and Connections | Input Connectors | 2 x 1/4″ TS female jacks (high impedance, unbalanced); |
| Output Connectors | 2 x XLR male connectors (balanced, low impedance, Pin 2 hot) | |
| Compatible Sources | RCA/3.5mm input adapter (optional); supports keyboards, guitars, synthesizers | |
| Dimensions (L x W x H) | 70 mm x 36 mm x 100 mm | |
| Physical and Environmental | Weight | 0.45 kg |
| Enclosure Material | Heavy-duty 14-gauge steel enclosure, powder-coated + internal I-beam frame | |
| Operating Temperature | -10°C～60°C | |
| Storage Temperature | -40°C～85°C | |
| Humidity | 0%～95% (non-condensing) | |
| Power and Safety | Power Requirements | None (Completely power-free design) |
| Safety Features | Short-circuit protection; phantom power safe (no internal circuitry) | |
| Installation and Control | Installation Method | Desktop/rack mount (optional stand); plug-and-play |
| Control Elements | Per channel: attenuator switch, ground lift switch | |
| Compatible Systems | Live PA, studio interface, AV integration; supports active/passive instruments |
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9th Floor, 1B, Shangzhi Technology Park, Guangming District, Shenzhen City, Guangdong Province, China
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