The Soundcraft Si Expression 2 Digital Mixer is a digital mixing console designed for live sound applications. The mixer features 24 microphone preamps, 4 line inputs, AES in, 4 internal stereo FX returns, 22 faders, a 64 x 64 expansion slot for additional routing possibilities, and 66 input processing channels.
Every input processing channel on the board can be routed through a dedicated high-pass filter, input delay, compressor, gate, and four-band equalizer. Each channel is also under the control of an automation system with four mute groups and illuminated faders to keep track of signal processing. For outputs, the mixer includes 16 balanced line outputs, a headphone monitor output, AES output, and the 64 x 64 expansion slot.
Features
- 24 Microphone Pre-Amplifiers
- 22 Multi-Color Illuminating Faders
- 64 x 64 Channel Expansion Slot
- 14 Auxiliary/Group Mixes
- 4 Stereo Lexicon FX Engines
- 66 Input Processing Channels
- Direct Ouput Gain Stabilization
- Copy and Paste Channel Strip
- Global Mode Encoders
- ViSi Remote Control over iPad
Specifications
| Preamplifier | 24 x Balanced XLR’s with preamps |
| Faders | 22 |
| Frequency Response | Mic/Line Input to any output ±1.5 dB, 20 to 20,000 Hz |
| THD | Mic sensitivity -30 dBu: <0.01% at 1 kHz |
| Residual Noise | Master output; no inputs routed, mix fader at 0 dB: <-86 dBu |
| Mic Input Noise (E.I.N.) | -126 dBu (150 Ω source) |
| Mix Output Noise | < -86 dBu |
| Input Noise | 1 input to mix at unity gain: -84 dBu |
| CMRR | Mic at 1 kHz: -80 dBu |
| Crosstalk | Channel On attenuation: <120 dB Channel Fader attenuation: <120 dB Mic-Mic: -100 dB at 1 kHz, -85 dB at 10 kHz Line – Line: -100 dB at 1 kHz, -85 dB at 10 kHz |
| Input Gain | Microphone: -5 to 58 dB integrated pad design in 1 dB steps Line Trim: -10 to 16 dB |
| Gate | Threshold: -60 dBfs to -6 dBfs Depth: -60 to -3 dB Attack: 0.1 to 200 ms Release: 20 to 500 ms Side-chain HPF 22 to 2,500 Hz Side-Chain LPF 160 to 20,000 Hz |
| Threshold | -52 dBfs to -6 dBfs Ratio 1:1 to 20:1 |
| Ratio | 1:1 to 20:1 |
| Attack | 0.1 to 200 ms |
| Release | 5 to 900 ms |
| Make-up Gain | 0 to 24 dB |
| Equalizer | Hi Mid and Low Mid: 22 to 20,000 Hz, ± 15 dB, Q 6 to 0.3 Shelf (HF): 800 to 20,000 Hz, ± 15 dB Shelf (LF): 20 to 500 Hz, ± 15 dB HPF: 40 to 1,000 Hz |
| Audio Delay | User adjustable 1 sample to 500 ms |
| Graphic EQ | 31 to 16 kHz, 1/3 octave |
| Digital I/O | AES Sample Rate Converter range: 8 to 200 kHz External World Clock In range: 48 kHz ±7 Hz (internal systems), ±3 Hz with stageboxes Word Clock Out jitter: ±7 ns Analogue Out for 0 dBfs: +21.5 dBu Converter resolution: 24 bit DSP resolution: 40 bit floating point |
| Latency | Mic In to Line Out: <0.8 ms Analogue In to AES Out: <0.6 ms AES In to Line Out: <0.8 ms AES In to AES Out; <0.5 ms Stagebox Mic In to Stagebox: <0.9 ms |
| Input Level | Mic Input: +22 dBu max Line Input: +22 dBu max |
| Output Level | Mix Output: +21.5 dBu max Headphones at 150 Ω 300 mW (recommended impedance 32 to 200 Ω) |
| Input Impedance | Mic Input: 3 kΩ Line Input: 10 kΩ AES Input: 110 kΩ Word Clock used as Input: 110 kΩ |
| Output Impedance | Outputs: 150 Ω (balanced), 75 Ω (unbalanced) Word Clock used as Output: 50 Ω Word Clock used as Input: 47 kΩ AES Output: 110 Ω: |
| Lamp | 12 VDC at 100 mA per socket |
| Power Consumption | <130 W AC Input Voltage range: 88 to 264 VAC auto sensing AC Frequency range: 47 to 63 Hz |
| Operating Conditions | Operating Temperature range: 41 to 113°F (5 to 45°C) Humidity: 0 to 90% non condensing Ta= 104°F (40°C) Storage Temperature range: -4 to 140°F (-20 to 60°C) |
| Dimensions | 6.70 x 28.2 x 20.5″ (169 x 716 x 520 mm) |
| Weight | 34.1 lb (15.5 kg) |
| Package Weight | 47 lb |
| Box Dimensions (LxWxH) | 33 x 27 x 11″ |
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