ULTRA-DI DI400P is a high-performance passive direct injection box that can directly input high-impedance signals such as guitars and keyboards into the mixing console, and can also directly input the output of the effects into the mixing console.
This manual explains how to connect high‑impedance instruments such as guitars to a mixing console using the DI400P passive direct injection box. It shows the input and output connections, the grounding‑lift switch, and how to place the box in the signal chain for optimal performance.
The document also includes important safety instructions, warranty information, and a full set of technical specifications such as frequency response, distortion, impedance ratio, dimensions, and weight. This manual is written in Chinese.
| Frequency response | 40 Hz – 3 dB to 20 kHz |
|---|---|
| Total harmonic distortion + noise | 0.007 % @ 1 kHz |
| Input level | +4 dBu |
| Input connector | 6.3 mm unbalanced jack |
| Output level change | -20 dB |
| Output connector | Balanced output |
| Impedance ratio | 110 : 1 |
| Dimensions (H × W × D) | ≈ 35 mm × 120 mm × 66 mm |
| Weight | ≈ 0.2 kg |
Connect the instrument to the DI400P input, then use the balanced output to feed the mixing console’s microphone input; the box converts the high‑impedance signal to a low‑impedance mic‑level signal.
The DI400P has a frequency response of 40 Hz – 3 dB up to 20 kHz.