Soundcraft 5035677 Si Expression 1 Digital Mixer

The Soundcraft Si Expression 1 is a powerful yet compact digital mixer, purpose-built for live sound reinforcement in small to medium venues. With 16 mic preamps, 4 line inputs, AES input, and 66 total input processing channels, this mixer offers exceptional versatility and professional-grade signal control.

Each input channel comes equipped with essential tools such as a high-pass filter, input delay, compressor, gate, and a four-band parametric EQ. Output flexibility is extensive, with 16 balanced line outputs, AES output, headphone monitoring, and a 64 x 64 expansion slot for seamless integration with various digital audio protocols including MADI, Dante, USB, and more.

The Si Expression 1 boasts 35 total busses, including 14 configurable aux/group mixes and 4 dedicated Lexicon FX busses. Its built-in hardware-based Lexicon FX engine allows real-time effects processing without consuming DSP resources needed for other channels. A 28-band graphic EQ is available on every matrix, mix, and master output, ideal for precise tuning of speaker systems.

A standout feature is the TOTEM (One Touch Easy Mix) system, which simplifies mixing to FX, aux, or matrix busses. Multi-color faders and assignable channel strips provide intuitive visual feedback and tactile control over gain, pan, EQ, and more—eliminating the need to scroll through menus. Control can also be extended wirelessly using the ViSi app on iPad, allowing engineers to walk the venue while adjusting sound.

For integration into larger systems or remote setups, the Si Expression 1 is compatible with Soundcraft’s stageboxes and expansion cards. Its dedicated controls, flexible routing, and onboard processing make it a powerful, user-friendly choice for live sound professionals who demand precision and reliability.

Features:

• 16 mic preamps and 4 line inputs with AES I/O

• 66 input processing channels with full dynamics and EQ

• 35 mix busses including 14 aux/group and 4 matrix mixes

• 4 hardware Lexicon FX engines with dedicated busses

• Multi-color illuminated faders for intuitive control

• TOTEM One Touch Easy Mix system for bus mixing

• Assignable channel strip with rotary controls for fast access

• 64 x 64 expansion slot for I/O options including MADI, Dante, USB, and more

• ViSi iPad remote app support via HiQnet Ethernet

• 28-band graphic EQ on every output bus

• USB port for preset storage and security lockout

Specifications: