The Soundcraft Si Expression 1 Digital Mixer is a digital mixing console designed for live sound applications. The mixer features 16 microphone preamps, 4 line inputs, AES in, 4 internal stereo FX returns, 14 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.
The mixer features 14 aux/group mixes that can be used as 14 mono mixes, or 8 mono and 6 stereo mixes, or any combination between. The mixer also utilizes 4 matrix mixes that allow you to assign any combination of inputs to any combination of outputs in either mono or stereo mode. In addition to the auxiliary/group and matrix busses, the unit features four mix busses dedicated to the device's internal Lexicon FX processing. Each bus mix includes a delay, compressor, a four-band equalizer, and a BSS graphic equalizer. Since the Lexicon FX processor is hardware based, using the effects does not influence the signal processing performance of the rest of the mixer.
For I/O expansion, the mixer will accept any of the Soundcraft Si series option cards including AES, AVIOM, CobraNet, Firewire/USB/ADAT, Dante CAT5, and optical MADI. The MADI card allows you to connect to multi-track recording systems, plug-ins such as WAVES, and Studer or Soundcraft stageboxes. Using a stagebox increases both the number of physical inputs, as well as the number of input processing channels. Every processing parameter utilizes a dedicated control so that you do not need to navigate through menu hierarchies to make adjustments. A row of global mode encoders above each channel gives you control over gain, high-pass filter parameters, and pan position.
Multi-Color Illuminating Faders
Equalizer
Color Touch Screen
66 Mix Channels
ViSi Remote Control
TOTEM One Touch Easy Mix System
Assignable Channel Strip
35 Busses
Global Mode Encoders
Direct Output Gain Stabilization (D.O.G.S.)
Lexicon FX Engine
Graphic EQ
Copy and Paste
Function Focus
Instant Access Keys
USB Setting Storage
Security Lockout
Soundcraft Si Expression 1 Specs
| Number of Analog Input Channels | 16 |
| Number of Mic Preamps | 16 |
| Faders | 14 |
| Gain/Trim Range | Mic: -5 dB to 58 dB (in 1 dB Steps) Line: -10 dB to +16 dB |
| Gate Parameters | Threshold: -60 to -6 dBFS Depth: -60 to -3 dB Attack: .1 ms to 200 ms Release: 20 ms to 500 ms |
| Compressor Parameters | Threshold: -52 to -6 dBFS Ratio: 1:1 to 20:1 Attack: .1 to 200 ms Release: 5 to 900 ms Makeup Gain: 0 to 24 dB |
| Sidechain Filters | Gate: High-Pass: 22 Hz to 2.5 kHz Low-Pass: 160 Hz to 20 kHz |
| EQ Parameters | 1 x HF Shelf: ±15 dB at 800 Hz to 20 kHz 2 x MF Notch/Peak: ±15 dB at 22 Hz to 20 kHz, 6 to 0.3 Q 1 x LF Shelf: ±15 dB at 20 Hz to 500 Hz |
| Graphic EQ | 28-Band 1/3 Octave, 31 Hz to 16 kHz |
| Filters | High-Pass: 40 Hz to 1 kHz |
| Audio Delay | Adjustable Up to 500 ms |
| Sample Rates | AD/DA Conversion: Up to 200 kHz |
| Bit Depth | AD/DA Conversion: 24-Bit |
| DSP | 40-Bit Floating Point |
| Jitter | ± 7 ns |
| Word Clock Input | 48 kHz ±7 Hz |
| Latency | < 0.8 ms (Mic Input to Line Output) < 0.6 ms (Analog Input to AES Output) < 0.8 ms (AES Input to Line Output) < 0.5 ms (AES Input to AES Output) < 0.9 ms (Stagebox Input to Stagebox Output) |
| dBFS Reference Level | +21.5 dBu = 0 dBFS |
| Frequency Response | Mic/Line Input: 20 Hz to 20 kHz ±1.5 dB |
| Max Input Level | Mic Input: +22 dBu Line Input: +22 dBu |
| Output Level | Mix Output: +21.5 dBu (Max) |
| Headphone Output Power | 300 mW into 150 Ohms |
| I/O Impedance | Mic Input: 3 Kilohms Line Input: 10 Kilohms AES3 Input: 110 Kilohms Output: 150 Ohms (Balanced) 75 Ohms (Unbalanced) Word Clock Output: 50 Ohms Word Clock Input: 47 Kilohms AES3 Output: 110 Ohms |
| Crosstalk | Adjacent Channels: < 120 dB Adjacent Inputs: -100 dB at 1 kHz -85 dB at 10 kHz |
| CMRR | -80 dBu |
| EIN | -84 dBu at Unity Gain -126 dBu (150-Ohm Input) |
| Noise Floor | < -86 dBu < -86 dBu at Unity Gain |
| THD | < 0.01% |
| Analog Inputs | 16 x XLR Balanced Mic/Line Input |
| AC Input Power | 88 to 264 VAC, 50 / 60 Hz |
| Power Consumption | 130 W (Maximum) |
| Lamp Power | 12 VDC at 100 mA |
| Operating Temperature | 41 to 113°F / 5 to 45°C |
| Operating Humidity | 0 to 90% |
| Storage Temperature | -4 to 140°F / -20 to 60°C |
| Dimensions | 6.7 x 19 x 20.5" / 169 x 483 x 520 mm |
| Weight | 24.2 lb / 11 kg |
| Package Weight | 36.65 lb |
| Box Dimensions (LxWxH) | 28 x 22 x 10" |
