Up to 80 channels to mix
32 Mic Inputs
8 XLR/1/4" Combi-jacks for line inputs and instruments
40 DSP input channels (32 mono inputs and 4 stereo channels/returns)
31 Output busses (All with full DSP processing and GEQ)
4-band Fully Parametric EQ on each channel and bus
8 VCAs + 8 Mute groups
26 motorised faders (24 input + LR/Mono)
4 fully customisable Fader Layers
Built-in Stagebox Connectivity
5" touchscreen display
Multi-Colour LCD Channel Displays on each input fader
4 studio-grade Lexicon Effects engines and dedicated FX busses
BSS Graphic Equalisers on every bus
20 sub-group / aux busses
4 mono/stereo matrix busses
32x32 USB audio interface for multi-track recording and playback *
Increase I/O capabilities with option cards and stageboxes:
Use included MADI option card and Soundcraft Mini Stagebox 32i or 16i for more microphone preamps, inputs and channels to mix
Add 2nd MADI option card and two Soundcraft Mini Stagebox 32i or 16i for up to 96 microphone preamps, 136 total inputs and 80 channels to mix.
Add Dante option card for 64 channels of Dante to mix
Additional option cards available: AVIOM A-Net, CobraNet, AES/EBU, BLU Link, more

Specifications
Height: 160mm (6.3")
Width: 750mm (29.5")
Depth: 500mm (19.7")
Weight: 20kg (44.1lb)

Voor meer info en downloads : 
https://www.soundcraft.com/en/products/si-impact