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Quantum638T is built on the same hardware platform as the Quantum638, providing 256 input channels, 128 Aux/Sub-Group busses, a 48 x 48 Matrix, 38 motorised faders and three 17-inch high-resolution touchscreens.
The key difference is the addition of DiGiCo’s Theatre software extension, developed for productions with complex Cue structures, changing casts and detailed show programming.
The Quantum638T reflects the requirements and working practices established in professional theatre environments including Broadway, the West End and other major theatre markets, while retaining a worksurface layout and operating approach familiar to SD7 and SD5 users.
Quantum638T uses the same Quantum architecture as the standard Quantum638, including seventh-generation FPGA processing, Nodal Processing, Mustard Processing, Spice Rack and True Solo.
The Theatre software extension adds Auto Update, Aliases, Players, advanced Control Group programming tools and Matrix Nodal Delays.
These functions address the way theatre productions are actually built and operated. A show continues to develop throughout rehearsals, cast members may change, and channel settings have to follow the scene structure and Cue sequence precisely.
In this context, a Cue is a programmed console state or command associated with a specific point in the performance.
During rehearsals, channel settings are continually refined.
Levels, EQ, dynamics, routing and other parameters change as the production develops.
Auto Update allows selected changes to be applied across related Cues according to defined rules.
In practice, an engineer can adjust a channel during rehearsal and apply that change to other Cues that use the same setting.
For large productions containing tens or hundreds of Cues, this provides a more efficient way to manage changes than editing each scene individually.
Aliases allow multiple sets of settings to be stored for the same channel.
The physical input remains unchanged, while its processing and parameters can vary according to the scene, role or performer.
For example, the same radio microphone may be used in different parts of a production with different EQ, Dynamics and routing requirements. A separate Alias can be prepared for each situation and recalled in the relevant Cue.
This helps keep the show file structured and avoids creating unnecessary duplicate channels.
Players is designed specifically for cast management.
A single role may be performed by several actors, each with a different voice, signal level and individual processing requirements.
Players allows separate parameter sets to be prepared for different performers and the appropriate cast to be selected before the show.
For theatres working with understudies, touring productions or musicals with multiple casts, this significantly simplifies preparation. The engineer does not need to rebuild large numbers of Cues every time the performer changes.
The active cast in a theatre production can change constantly from one scene to the next.
Control Groups allow the appropriate channels to be grouped and managed together. Quantum638T adds advanced CG programming tools intended specifically for this changing theatre structure.
Control Groups can therefore be organised in line with scenes and Cues, keeping the groups required at any given point in the performance immediately available on the worksurface.
This becomes particularly useful in musicals and larger drama productions where dozens of radio microphones may be active across the show.
Matrix Nodal Delays allow individual delay values to be applied at specific points within the Matrix.
For theatre, this is particularly relevant when working with distributed reinforcement systems.
A main PA may be supplemented by front fills, delay systems, under-balcony loudspeakers and other zones, each of which requires accurate time alignment.
Matrix Nodal Delays allow those zones to be aligned more precisely within the console Matrix and matched to both the main system and the action on stage.
This affects more than timing alone. It also contributes to localisation, helping the audience associate a voice with the performer on stage rather than with the nearest loudspeaker.
In theatre, Cues form the operating structure of the show.
They can contain level changes, routing, processing parameters and other actions that need to occur at a precise point in the performance.
Macros allow several operations to be combined into a single command and assigned to physical controls on the worksurface.
Channel Macros move with the channel when the console layout changes, keeping the relevant command associated with its source regardless of where that channel is currently placed.
Quantum638T uses the same worksurface as the Quantum638, with three 17-inch high-resolution touchscreens and 38 touch-sensitive, motorised 100mm faders.
Three 14-inch high-resolution meterbridge screens, three Bank Switcher screens and 53 full-colour TFT displays provide additional visual feedback.
The left, centre and right sections each provide six layers of six banks, and any fader can be assigned to any channel type.
For theatre, this allows the worksurface to be organised around the structure of the production itself: principal characters, ensemble, orchestra, Control Groups, FX and Master busses.
Quantum638T provides two independent sets of headphone outputs.
DiGiCo specifically identifies the use case where a sound designer and engineer need to monitor different sources independently.
During technical rehearsals, the operator can continue working on the main mix while the sound designer listens separately to a particular channel, effect or area of the system.
For productions where programming and sound design are taking place at the same time, this gives both members of the team independent monitoring from the same worksurface.
Like the standard Quantum638, the Quantum638T is available in Single Engine and Dual Engine configurations.
The Dual Engine version can also operate in Single Engine mode, allowing the console architecture to be selected according to production scale, redundancy requirements and budget.
For theatre and touring productions, where system continuity during a performance is critical, the Dual Engine option provides an important route to a higher level of redundancy.
Each processing engine provides two DMI slots, Dante Primary and Secondary connectivity, a MultiMode Optocore interface, a Fourier Interface Card and MADI I/O.
Two DMI slots per processing engine allow the required I/O interfaces to be selected for 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.
A single MultiMode Optocore interface provides 504 additional audio paths at 48kHz and 96kHz. An optional second Optocore loop can be added to each processing engine, providing a further 504 audio paths.
For larger theatres, this allows the console, stage racks and other system components to be integrated into a single high-channel-count infrastructure.
Quantum638T measures 1555 x 957 x 535mm and the worksurface weighs 93kg.
Its footprint is close to that of the SD7, something DiGiCo specifically highlights for theatres requiring additional processing capacity while working within an existing control-room layout.
For established venues, this can make the transition to the Quantum platform considerably more straightforward, particularly where furniture, sightlines and operator positions have already been designed around an SD7-sized console.
The main difference between the Quantum638T and standard Quantum638 is not channel count or worksurface size, but the way a theatre show can be programmed and managed.
Auto Update, Aliases and Players address changes within the production and cast. Advanced CG programming supports the changing structure of characters and ensembles, while Matrix Nodal Delays add further control over distributed sound reinforcement.
At the same time, operators retain a DiGiCo worksurface approach that will feel familiar to existing SD7 and SD5 users.
It is this combination of the Quantum638 hardware platform and DiGiCo’s theatre-specific software tools that defines the role of Quantum638T within the range.
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