Architecture and Engineering Specifications
The control centre shall be designed for digital audio mixing applications and be optimised for use in live performance. It shall feature 168 simultaneous input channels and 99 time-aligned and phase-coherent output mix buses and operate at 96 kHz sampling rate.
The control centre shall include Gigabit and 100 Mbit/s Ethernet frame-based digital audio networking with a total network channel count capability of 288 inputs and 294 outputs at 96 kHz sampling rate. A Gigabit Ethernet frame-based digital audio network router shall be included with 192 bidirectional channels operating over optical fibre up to 500 m and CAT5/5E cable up to 100 m, and provide a dual redundant digital snake connection to the associated audio system digital signal processing engine.
The Gigabit digital audio network shall operate on a time-division multiplex basis, and shall provide accurate phase-aligned low-jitter clock distribution using embedded timing markers in the data streams to allow transmission over either Cat5/5E copper cable up to a distance of 100 m as specified by the IEEE 802.3 Ethernet standard, or up to distances of 500 m using 50/125 μm multimode optical fibre. It shall provide two levels of cyclic redundancy check (CRC) error detection - a checksum sent with the associated Ethernet frame and an additional checksum for audio data. A dedicated 200 Mbit/s auxiliary data channel shall be provided for control data.
The Gigabit digital audio network shall have an individual link latency of 62.5 μs at 96 kHz sampling rate and support dual redundant operation.
The 100 Megabit Ethernet frame-based digital audio network shall offer N+1 cable redundancy and be compliant with the Audio Engineering Society AES50-2011 standard.
In conjunction with the associated audio system engine digital signal processor, the control centre shall provide up to 36 assignable digital audio emulations of industry standard one-third octave proportional-Q response graphic equalisers and up to 24 simultaneous multi-channel digital audio effects. There shall be automatic latency management of all internal routing, external analogue insert and digital signal processing delays. This latency management system shall synchronise audio samples when summing to mix buses to ensure phase alignment of the summed signals.
The control centre shall provide a user navigation system including 10 variable control association (VCA) groups and 8 population (POP) groups. It shall also provide additional methods of user navigation including a mode to change the operation of the input faders to become send levels to the selected bus or output, a mode mapping of assignable controls to an internal effects processor, a mode to present the faders of an internal graphic equaliser on the VCA section faders and a mode to present the faders for a selected bus output on the VCA section faders.
The control centre shall have 29 motorised 100 mm faders with a rated life time of up to one million cycles and two daylight-viewable 15" full colour display screens. It shall include software interpolation of physical control elements and associated display feedback to eliminate digital quantisation artefacts.
The control centre shall have the provision for the optional wireless control using an Apple iPad, with a bespoke software application available as a free download from the Apple App Store.
The control centre shall include dual-redundant control computers, and three auto-ranging universal switch-mode power supplies with N+1 redundancy for use on a worldwide basis. The power supply modules shall be externally removable and interchangeable with those in the associated audio system engine digital signal processor.
The control centre shall be 1365 mm wide x 940 mm deep x 434 mm high (53.7" x 37.0" x 17.1"), with nominal weight 120 kg (264 lbs). The control centre shall be installed on a flat horizontal surface capable of safely supporting its weight. Input, output, and power connections shall be made at the rear panel of the control centre. Installers shall allow adequate space at the rear for connection and disconnection of input, output, and power connections. The power requirements shall be 100 to 240 VAC, 50 to 60 Hz.
The control centre shall be the Midas PRO X-CC-IP and no other alternative shall be acceptable.