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:
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32 XLR mic preamps with dedicated gain control
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30 motorized faders with multi-color illumination
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66 input channels with EQ, dynamics, and delay
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4 Lexicon hardware-based stereo FX engines
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28-band graphic EQ on all mixes and mains
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35 configurable busses including aux, FX, and matrix
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ViSi iPad remote control via Harman HiQnet network
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Assignable channel strip for tactile parameter control
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One-touch mix functionality with TOTEM system
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AES, USB, Dante, MADI, and more expansion card support
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Direct Output Gain Stabilization (D.O.G.S.)
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USB setting backup and function-focused display
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Copy-paste channel settings
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High-contrast color touchscreen for control and monitoring
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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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