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The Quantum638 is the latest addition to DiGiCo’s Quantum range, positioned between the Quantum852 and Quantum338 Pulse. In worksurface format and operating logic, it continues the path established by the SD7 and SD5, while moving onto DiGiCo’s seventh-generation FPGA architecture and the current Quantum platform.
For DiGiCo, the Quantum638 fills an important position in the range. It is designed for large-scale live productions, festivals, touring systems and fixed installations where high channel counts, extensive routing and a choice of Single Engine or Dual Engine architecture are required.
Quantum638 provides 256 mono input channels and 128 Aux/Sub-Group busses.
Each input channel includes Main and Alternative inputs, Analogue Gain, Gain Tracking, Digital Trim, Variable Delay, DiGiTube, HPF/LPF, four-band Parametric EQ / Dynamic EQ, two Dynamics sections, two Insert points and Direct Output.
In practical terms, the standard channel processing provides the core tools required for vocals, instruments, radio microphones and playback sources.
Aux/Sub-Group busses also feature full processing, including eight-band EQ, Dynamics, DiGiTube, Delay and Insert points.
Quantum638 also provides:
a 48 x 48 fully processed Matrix;
36 Control Groups;
two Solo busses;
32 32-band Graphic EQs;
48 internal stereo FX;
64 Mustard Processing strips;
128 Nodal Processing instances;
16 Spice Rack slots.
Nodal Processing allows dedicated processing to be applied at an individual Aux node of a channel.
For example, a vocal microphone can use one EQ and dynamics setting in the main mix while feeding an Aux with different processing, all from the same source channel.
In complex live and distributed systems, this reduces the need to duplicate channels simply to achieve different processing paths and helps keep the session structure more manageable.
Quantum638 includes 64 Mustard Processing strips. Available processing includes Tube Emulation, HPF/LPF, four-band EQ, multiple compressor models, FET Limiter, Optical Compressor, Levelling Amplifier, Gate, Ducker and MSE.
Mustard Processing can be inserted where additional processing or a different style of dynamics and EQ control is required.
The console provides 16 Spice Rack slots for additional onboard processing. The Quantum638 specification includes, among other tools, a six-band Dynamic Multiband Compressor/Expander and six-band Dynamic EQ.
This allows a substantial amount of more advanced processing to remain inside the Quantum environment without the need for an external processor.
Quantum638 is equipped with 38 touch-sensitive, motorised 100mm faders. The left, centre and right sections each offer six layers of six banks. Any fader can be assigned to control any channel type, allowing the worksurface layout to be built around the requirements of a particular production.
For example, key vocals and Control Groups can be placed in the centre section, instruments on the left, with FX, playback sources and Master busses on the right.
For larger productions, this means the engineer can organise the surface around the channels and groups that matter at a given point in the show rather than around a fixed console structure.
The worksurface features three 17-inch high-resolution touchscreens. Above them are three 14-inch high-resolution meterbridge displays.
Three Bank Switcher screens and 53 full-colour TFT displays are also integrated across the channel sections.
The result is more channel, metering and assignment information available directly on the worksurface, reducing the number of screen changes required during operation.
Macro control has been expanded on the Quantum638. Each channel has dedicated channel Macros, and the assignment moves with the channel when the worksurface layout changes. Assignable Macroder rotary encoders dynamically change function according to the currently selected channel.
This provides direct physical access to frequently used programmable parameters and reduces the need to rely on touchscreen navigation.
SD7 users will also recognise the dedicated Gain/Trim encoders positioned above the channel strips.
The new InfoBar provides a permanent view of key system information including Snapshots, timecode, actual time and system warnings. During a live show, the engineer can immediately see the active Snapshot, confirm timecode status and monitor important console conditions.
This is particularly useful in productions where console automation and external synchronisation are part of the show structure.
Quantum638 is available in two configurations: Single Engine and Dual Engine. The Single Engine version provides the platform for systems where one processing engine is sufficient.
The Dual Engine version is intended for applications with higher redundancy requirements and can also be operated in Single Engine mode.
This is one of the defining architectural features of the Quantum638, allowing the same console platform to be configured according to production scale, redundancy requirements and budget.
Each processing engine includes Dante Primary and Secondary connectivity. A Fourier Interface Card is also fitted as standard for integration with the transform.engine platform. Two DMI slots per processing engine allow the I/O configuration to be tailored to the system.
Supported DMI cards include ADC, AES, AMM, AVB, DAC, Dante, Dante64@96, Hydra 2, KLANG, MADI B, MADI C, ME, Mic and Waves.
The MultiMode Optocore interface provides 504 additional audio paths per processing engine at both 48kHz and 96kHz. A second Optocore loop can be added as an option.
The rear panel provides eight 32-bit Mic/Line inputs and eight 32-bit Line outputs. There are also four AES/EBU inputs providing eight channels, four AES/EBU outputs providing eight channels, GPI/GPO, MIDI In/Thru/Out and SMPTE I/O.
MADI connectivity supports up to eight MADI interfaces at 48kHz or four interfaces at 96kHz. Four redundant MADI interfaces can also be used at 48kHz.
The significance of Quantum638 is not simply its channel count. The console combines a large worksurface, extensive internal processing and flexible routing with an operating approach familiar to SD7 and SD5 users.
For engineers already working with DiGiCo, moving to Quantum638 retains much of the established workflow while adding greater processing resources, current connectivity and the option to choose between Single Engine and Dual Engine architecture.
DiGiCo positions the Quantum638 for live concerts, festivals, touring productions, theatrical applications and fixed installations.
For productions requiring theatre-specific programming, the Quantum638T adds the Theatre software extension to the same underlying platform.
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