The Q-DI from SM Pro Audio is a four-channel DI box featuring high quality unbalanced to balanced line conversion, in addition to providing an extremely useful built in line mixer. Each input features an attenuation switch, a ground lift switch, volume and pan controls, and terminates in a balanced XLR output.
Housed in a rugged road-worthy half rack-mount enclosure, the unit will find use in home and professional studios, sound reinforcement systems and live PA applications, as well as many other audio fields. It covers all typical applications, such as instrument routing to line inputs. Additionally, its versatile four-channel layout and headphone output makes it ideal for small line mixing applications.
| Type | Direct Inject box with Line Mixer |
| Input Connections | 4 x 1/4" TS phone |
| Input Impedance | 47kΩ |
| Minimum Sensitivity | -20dB |
| Maximum Input Level | +16dB |
| Output Connectors |
4 x XLR 2 x RCA phono |
| Output Impedance | 600Ω |
| Maximum Output Level |
XLR: 0.0dB (peak level +18.5dB) RCA: +2.0dB (peak level +18.5 dB) |
| Frequency Response | 20Hz to 20kHz, 0/-2.0dB |
| Distortion | 0.02% |
| Noise | SNR: >74dB |
| Crosstalk | >80dB @ 1kHz, -20dB input |
| Power | 17VDC via included adapter |
| Dimensions (WxDxH) | 8.5 x 8 x 1.75" (216 x 203 x 45mm) |
| Weight | 3.9 lb (1.8kg) |