The Soundcraft Si Expression 3 Digital Mixer is a robust 32-channel mixing console designed specifically for live audio environments. Built for professional stage use, it features 32 microphone preamps, 4 line inputs, 30 faders, 4 internal Lexicon FX engines, and a 64 x 64 expansion slot, offering flexibility and high-performance signal processing.
With 66 mixable channels and support for dedicated dynamics, EQ, delay, and filtering, each input is fully customizable. The multi-color fader illumination system enhances workflow by visually indicating function states. The TOTEM one-touch mix system and assignable channel strip simplify complex mix configurations, while the ViSi iPad app enables remote control from anywhere in the venue.
The Si Expression 3 supports 35 busses, including matrix, FX, aux, and main mix busses, all with onboard processing. The inclusion of a 28-band graphic EQ on every mix and master bus ensures comprehensive frequency shaping. Its Direct Output Gain Stabilization (D.O.G.S.) system is ideal for in-ear monitoring setups by maintaining consistent levels.
Expandable via option cards (Dante, MADI, USB, and more), it integrates easily into modern live setups. Global mode encoders, function focus, USB save/load, and a security lockout add further convenience and control. Whether for concerts, houses of worship, or live productions, the Si Expression 3 delivers clarity, power, and professional-grade flexibility.
Features:
32 XLR mic preamps with dedicated gain control
30 motorized faders with multi-color illumination
66 input channels with EQ, dynamics, and delay
4 Lexicon hardware-based stereo FX engines
28-band graphic EQ on all mixes and mains
35 configurable busses including aux, FX, and matrix
ViSi iPad remote control via Harman HiQnet network
Assignable channel strip for tactile parameter control
One-touch mix functionality with TOTEM system
AES, USB, Dante, MADI, and more expansion card support
Direct Output Gain Stabilization (D.O.G.S.)
USB setting backup and function-focused display
Copy-paste channel settings
High-contrast color touchscreen for control and monitoring
Global mode encoders for instant channel access
Specifications:
| Category | Details |
|---|---|
| Brand | Soundcraft |
| Model | Si Expression 3 |
| Mic Preamps | 32 |
| Line Inputs | 4 |
| Faders | 30 Motorized |
| Mix Channels | 66 |
| Busses | 35 (Aux, Matrix, FX, Main) |
| FX Engines | 4x Lexicon hardware-based |
| Graphic EQ | 28-band on every mix and master |
| Sampling Rate | Up to 200 kHz |
| Bit Depth | 24-bit |
| DSP | 40-bit floating point |
| Latency | < 0.9 ms (Max across paths) |
| Power Consumption | 130 W (Max) |
| AC Input | 88–264 VAC, 50/60 Hz |
| Operating Temp | 5 to 45°C |
| Storage Temp | -20 to 60°C |
| Operating Humidity | 0 to 90% |
| Dimensions (HxWxD) | 6.7 x 36.5 x 20.5 in (169 x 928 x 520 mm) |
| Weight | 46.2 lb / 21 kg |
| Shipping Weight | 53.3 lb |
| Box Dimensions | 41 x 27 x 11 in |
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