Si3+ (discontinued)

Rotary encoders and OLED screens on every channel

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The Soundcraft Si3+ is designed for live use on both touring sound systems and in fixed installations, its intuitive operation and high input and bus count makes it a perfect choice for House of Worship sound systems. Theatre users will also find the Soundcraft Si3+ very applicable in their area.

As standard the Si3+ has 64 mic inputs mapped across 2 sets of 16 faders with each set of faders having 4 independent banks to offer the ultimate in fader layering flexibility. The onboard mic inputs are complimented with four dedicated Stereo Line channels, and four dedicated FX Returns from the four internal stereo Lexicon FX processors offering a full 80 inputs to mix from the onboard I/O. Four 64x64 channel expander slots allow the installation of further I/O sources including the connection of Soundcraft and Studer stageboxes.

Eight balanced insert sends and returns are provided along with a vast bus count of 24 Group/Aux busses, 8 matrix busses and a full complement of monitor talkback and main bus outputs. Buses may be freely assigned to any of the option slots or 32 Bus Out XLR connectors which exist in addition to the dedicated MIX and monitoring output XLRs. Every bus has a dedicated 30-band BSS Audio graphic EQ, permanently patched in with no additional drain on DSP resource. A unique feature of the Si3+ is the inclusion of an analogue input or line-out for every bus, master, monitor and talkback function bar none! A direct out from every mono channel offers a simple way to record every channel whether requiring this for later mix-down and production work or to use as a virtual sound-check at the next gig!

Such is the power and topology of the Si Series that the separate DSP and control engines allow you to make any system or function changes live with no interruption in the audio.

Like the Si2+ and Si1+, the Si3+ uses a combination of rotary encoders and OLED screens on every channel so the engineer mixes at source, without recourse to a central screen, an interface welcomed by many engineers. Using the center section and channel encoders, it is possible to simultaneously monitor and control input EQ, input dynamics and output EQ. Four assignable on-board Lexicon effect engines supplement 4 stereo inputs to provide a really powerful mix package. Soundcraft’s offline editor program, Virtual Si, can be used to setup and manage complete shows offline, for later download to the console through a USB memory key.

With a wealth of input and output connections and power supply on board, the Si3+ can simply drop in where an existing analogue console sat, utilising existing copper cable snakes and splitter systems.



One Box

  • 64 mic inputs, 4 stereo line inputs, 24 aux buses
  • 8 matrix buses, 12 VCAs, 8 mute groups
  • 4-band fully parametric EQ with high and low cut filters
  • On-board dynamics
  • Four independent Lexicon processors with dedicated returns
  • 40 XLR outputs and LED meter for every bus



On the rear of this highly-featured console are all the I/O connectors you’ll need. Sixty-four XLR’s for the mic/line inputs, 4 stereo line level inputs, 24 bus output XLR’s, 8 matrix output XLR’s Left/Right/Centre mix output XLRs, Left/Right/Centre monitor output XLRs  and comprehensive internal and external talkback and Oscillator connections. There are also 8 analogue insert connections which allow outboard processing to be inserted into any input channel output bus. 

Offline Editor - Virtual Si

To compliment the Soundcraft Si3+, an offline editor (Virtual Si) is available for managing your show files offline.



























































  Version Language Size Uploaded
Offline Editors
platform icon [PREVIOUS] Virtual Si V5.2 Software
updated: Nov 2016
    10.2 MB Nov 2016
Software Updaters
platform icon Si Series Software
version 4.2 Build003, updated: Nov 2016
4.2 Build003     4.36 MB Nov 2016
Si Software V4.2 Build003 README     3.3 KB Nov 2016
  Version Language Size Uploaded
file type icon Soundcraft Si3+ dimension drawings (PDF)
updated: Nov 2023
    2.83 MB Nov 2023
file type icon Soundcraft Si3+ DXF Files (Zip)
updated: Nov 2023
    6.76 MB Nov 2023
file type icon Soundcraft Si3+ Rearview (DXF)
updated: Nov 2023
    2.14 MB Nov 2023
Owners Manuals
file type icon Compact Stagebox User Guide
en updated: Nov 2023
  en  1.09 MB Nov 2023
file type icon Si Series V3 User Guide
en updated: Nov 2023
  en  14.6 MB Nov 2023
file type icon Si Series V4.n User Guide Addendum
en updated: Nov 2023
  en  562 KB Nov 2023
file type icon Virtual Si V5 User Guide
en updated: Nov 2023
  en  987 KB Nov 2023
Quickstart Guides
file type icon Manual de arranque rapido (quick start in Spanish)
es updated: Nov 2023
  es  2.06 MB Nov 2023
file type icon Segue o Guia Rápido Soundcraft Si (Quick Guide in Portuguese)
updated: Nov 2023
    1.58 MB Nov 2023
file type icon Soundcraft Si Series Quick Start Guide
en updated: Nov 2023
  en  3.33 MB Nov 2023
file type icon Si+ Series Brochure
en updated: Nov 2023
  en  7.9 MB Nov 2023


Frequency Response - Mic input to Line output +0/-1dB, 20Hz – 20kHz
Frequency Response - Stereo input to master output +0.5/-0.5dB, 20Hz – 20kHz
THD+Noise 10Hz-22kHz
Mic In (min gain) to Bus output 0.006% @ 1kHz
Mic In (max gain) to Bus output 0.008% @ 1kHz
Stereo input to master output 0.005% @ 1kHz
Mic Input E.I.N <-126dBu (150Ω source); 22Hz-22kHz bandwidth, unweighted
Residual Noise <-88dBu Master output; no inputs routed, Mix fader @0dB
CMRR 80dB @ 1kHz
Sampling Frequency 48kHz
Convertor Resolution 24 bit
Latency - Mic Input to Bus output < 1ms @48kHz
DSP Resolution 40-bit floating point
Internal Clock Accuracy < +/- 50ppm
Internal Clock Jitter < +/- 5ns
Input & Output Levels - Mic Inputs +26dBu max
Input & Output Levels - Stereo Input +28dBu max
Input & Output Levels - Bus Outputs +22dBu max
Input & Output Levels - Nominal Operating Level 0dBu (-22dBFS)
Input & Output Impedances - Mic Inputs 6k8Ω
Input & Output Impedances - All other analogue Inputs >10kΩ
Input & Output Impedances - Line Outputs <75Ω
Oscillator 20Hz to 20kHz Sine/Pink Noise, variable level
Channel HP filter 22Hz-1kHz, 18dB per octave
Channel LP filter 500Hz-20kHz, 18dB per octave
EQ (Inputs and Bus Outputs) - HF 22Hz-20kHz, +/-15dB, Q= 0.3-6.0 or Shelving
EQ (Inputs and Bus Outputs) - Hi-Mid 22Hz-20kHz, +/-15dB, Q=0.3-6.0
EQ (Inputs and Bus Outputs) - Lo-Mid 22Hz-20kHz, +/-15dB, Q=0.3-6.0
EQ (Inputs and Bus Outputs) - LF 22Hz-20kHz, +/-15dB, Q= 0.3-6.0 or Shelving
Metering Internal 14-segment LED bargraphs for all Outputs. 12-section plus 9-section gain reduction OLED meters for all Inputs.
Mains Voltage Operating Range 90-264V, 47-63Hz, autoranging
Mains Power Consumption 400W
Operating Temperature 0°C – 45°C (32°F – 113°F)
Relative Humidity 0% – 90%, non-condensing Ta=40°C (104°F)
Storage Temperature -20°C – 60°C (-4°F – 140°F)
Height (Console Only) 340mm (13.4")
Height (with standard shipping carton) 500mm (19.7")
Height (with factory flightcase) 530mm (20.9")
Width (Console Only) 1685mm (66.3")
Width (with standard shipping carton) 1830mm (72.1")
Width (with factory flightcase) 1780mm (70.1")
Depth (Console Only) 817mm (32.2")
Depth (with standard shipping carton) 1010mm (39.8")
Depth (with factory flightcase) 1250mm (49.2")
Weight (Console Only) 61kg (134lb)
Weight (with standard shipping carton) 93kg (204lb)
Weight (with factory flightcase) 185kg (407lb)


HARMAN Professional Solutions:

Si3+ (discontinued)

Rotary encoders and OLED screens on every channel