The SSL Sigma is a remote controlled 16-channel analog summing mixer designed for the DAW user that seeks the legendary big sound of an SSL console while retaining the convenience of working in the box

SSL Sigma delivers the sonic benefits of SSL SuperAnalogue™ mixing with in-the-box automation. Using proprietary MDAC control technology first featured in our Duality and AWS studio consoles, Sigma’s 100% analogue summing engine can be driven by automation data created within your DAW of choice. Sigma features 16 flexible input channels which can be individually switched between being mono or stereo for up to 32 channels at mixdown. There is accurate front panel LED metering for all channels. There are two stereo mix busses with dedicated outputs and individual stereo insert points to facilitate implementation of parallel compression or convenient printing of stems back to the DAW with processing applied. Each input channel also features an individual direct output. Mix Bus B can also be injected into Mix Bus A for final mixdown.

An Artist and Studio monitoring section provides a Monitor and Headphone output. The Main monitor output has Main and Alternative connections to accommodate 2 sets of monitors. A comprehensive switching matrix enables selection of your monitor source. A large front panel level control uses a push select mechanism to determine whether it adjusts Mix A, Mix B, Main Monitor or Headphone. There is also a Talkback input with adjustable Dim level.

Switching of awide range of functions including, monitor level and source, inserts, talkback, sum B>A and mono check can all be achieved using any standard MIDI hardware control surface. A MIDI learn feature makes setup simple and easy. A pair of user assignable dual action push/hold buttons on the front panel or a foot-switch can be assigned to the same collection of switching functions. Sigma uses MIDI over Ethernet for control and to connect to a cross platform software interface which provides additional control and setup capability.

Connections
Power Supply IEC320 3-pin connector, 100 – 240 Vac, 50 – 60 Hz
DC Power 2mm DC power jack, +12V, < 3A
Analogue I/O 25-pin D-type socket, balanced, Zin > 10kΩ, Zo ≈ 100Ω
3-pin XLR-M, balanced, Zo ≈ 100Ω
Headphones Stereo 1/4" jack socket, Zo ≈ 75Ω
Footswitch Stereo 1/4" jack socket (1 circuit)
iJack Stereo 3.5mm jack socket, Zi ≈ 10k
Network 8P8c modular connector; ‘RJ-45’ type (100bT, Cat5)
USb 1 x type-B chassis socket (SSL diagnostic use only)
Performance
maximum I/O Level +18dBu, +22dBu or 24dBu
Frequency response 20Hz – 40kHz ±0.3dB
THD + N < 0.025% (20Hz – 20kHz)
Noise
CHIP to CHOP < –83dBu @ +24dBu (20Hz – 20kHz)
CHIP to MIX A < –75dBu @ +24dBu (20Hz – 20kHz)
(stereo, all channels routed)

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