Single Channel Passive Direct Injection Box

The SDI is a passive stand alone direct injection box which is ideal for bass guitar and acoustic instruments, electric guitars, keyboards, synthesizers audio signal pickup.

There are one unbalanced line-level input, one instrument input jack with a directly link via the parallel jack, one high level speaker input for capturing the live sound of the instruments amplifier and allows a speaker lead to pass through the unit.

The XLRM-3 balanced output has been isolated by transformer and a Ground Lift switch that is fitted to help combat ground loop. Left side is capacitor linked to ground while right side offers full grounding chassis connection.

The SDI professional quality direct injection box is designed for use in applications where exceptional audio performance together with the ability to handle signal level up to 100V line P.A. system is required.



  • Broadcast quality.
  • Compact design.
  • Transformer isolated output.
  • Ground lift options.
  • Use of highest quality components.
  • Use of military grade toggle switch.



  Frequency Response 0dB/-0.1dB 20Hz~20kHz
  Maximum Input Level    
    Speaker -60dB (ATTN) 100V (Max Input)
    Line -40dB (ATTN) 10V (Max Input)
    Instrument -20dB (ATTN) 1V (Max Input)
  Distortion 0.003% (0dBu, 1kHz)
  Insertion Loss  -0.5dB into 600Ω Load
    <0.1dB into 50kΩ Load
  Connections XLR Male Output,
    6.3mm 2 Pole Jack Input × 3,
    6.3mm 2 Pole Jack Iink × 2,
    Ground Lift Switch
  Dimensions W41 × H85 × D108 (mm)
  Net Weights 0.34kg