This is a professional single-channel passive impedance converter (Direct Box) designed for live performances, recording studios, and broadcast applications. The unit employs high-quality audio transformers to convert high-impedance unbalanced inputs to low-impedance balanced outputs, supporting long-distance cable transmission (>100 meters) without distortion while effectively eliminating ground loop noise, hum, and EMI/RFI interference. Its passive design requires no external power supply, offering plug-and-play functionality for connecting high-impedance sources like guitars, basses, and keyboards to professional mixing consoles or PA systems. The unit delivers an exceptional balance of audio fidelity and durability, ensuring natural tonal reproduction and reliable performance.
| Категория | Параметр Элемент | Описание параметров |
| Качество звука | Number of Channels | 1 (Mono) |
| Частотная характеристика | 20 Hz～20 kHz (±1 dB) | |
| Суммарные гармонические искажения (THD) | < 0.01% (1 kHz, 0 dBu input) | |
| Отношение сигнал/шум (SNR) | > 100 dB (A-weighted) | |
| Максимальный уровень входного сигнала | +20 dBu | |
| Максимальный выходной уровень | 0 dBu (balanced output) | |
| Impedance Ratio (Input/Output) | 133:1 (high-impedance input to low-impedance output) | |
| Phase Shift | < 5° (full frequency range) | |
| Динамический диапазон | > 120 dB | |
| Изоляция и шумоподавление | Transformer Type | Jensen JT-DB-E Class 10:1 audio transformer (nickel core, Faraday shielded) |
| Isolation Voltage | > 1 kV (input/output) | |
| Ground Loop Noise Suppression | > 60 dB (50/60 Hz); > 40 dB EMI/RFI | |
| Максимальная дальность передачи | > 100 m (balanced XLR cable, no noticeable attenuation) | |
| Ground Lift | Independent switch to eliminate ground loop hum | |
| Interfaces and Connections | Входные разъемы | 1 x 1/4″ TS female jack (high impedance, unbalanced) |
| Выходные разъемы | 1 x XLR male connector (balanced, low impedance, Pin 2 hot) | |
| Thru Output | 1 x 1/4″ TS female jack (parallel output) | |
| Compatible Sources | For high-impedance devices like guitars, basses, keyboards, synthesizers, etc. | |
| Физические и экологические | Габариты (Д x Ш x В) | 70 мм x 36 мм x 100 мм |
| Масса | 0.45 kg | |
| Материал корпуса | Heavy-duty 16-gauge steel enclosure, powder-coated | |
| Рабочая температура | -10°C～60°C | |
| Температура хранения | -40°C～85°C | |
| Влажность | 0%～95% (non-condensing) | |
| Электроэнергия и безопасность | Требования к питанию | None (fully passive design) |
| Safety Features | Short-circuit protection; phantom power safe (no internal circuitry) |
400-900-2726
9-й этаж, 1B, Технологический парк Шанчжи, район Гуанмин, город Шэньчжэнь, провинция Гуандун, Китай
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