Allen & Heath Sigma Manual

Allen & Heath Ikke kategoriseret Sigma

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Side 1/1

SIGMA OPERATING SYSTEM HIGHLIGHTS

24 bus outputs.

Assignment to buses from inputs and from monitors.

8 auxiliary mixes for cue and echo (in-line M470 systems) 6 on

M410/20/30 systems.

Two stereo cue outputs with talkback for performer's foldback.

Stereo monitor/remix main output.

Mono sum of stereo output.

Four variable equaliser sections plus high pass filter provided on

inputs and monitors.

Low residual noise preamps, equalisers, line and mix amplifiers.

Low distortion design at all points in the system.

PFL facility on all inputs, groups and monitors. Interrupts LS and

meter only.

AFL facility on all inputs, groups and monitors derived post-pan-

pot. Interrupts LS and meter only.

SOLO MUTE facility on all inputs and monitors. Auto shut-off of all

sources not selected SOLO.

SOLO MUTE has two sub systems — input and monitor. Both can

be enabled and inhibited independently.

AUTO MUTE facility on all inputs and monitors, sequence and

synchronise audio mutes to MIDI.

Three fader options, retrofit capable. 100mm low cost or VCA

grouping or fader automation.

Capacity for 56 modules, potentially 112 inputs to the mix.

2 mainframe lengths 36 and 48 module capacity total.

Complementary module expander frames and patchbay/

producer's desk frames.

High standard of appearance when installed, cabling concealed

within the frame.

Electronic balanced circuits on all main inputs and outputs

including microphones, line and tape inputs, group outputs, main

outputs, etc.

Attention to details of audio performance at all stages. The

electronic signal path is of the high input impedance, low output

impedance type. Coupling capacitor isolate all input connections

and outputs from DC offsets. All switches pot and faders are

capacitor coupled to prevent clocks and noise.

Amplifier bandwidths are tailored to accept the maximum

bandwidth possible while rejecting extreme LF (sub 5Hz) and HF

(over 60KHz) signals. While the external operating level is + 4dBv

(1.23v RMS) the internal level is reduced to 0dBv. This yields 22dB

internal headroom 0VU sine wave input or output and maximum

output level.

The electronically balanced outputs are actively driven by

separate amplifiers for each phase (pin 2 hot) and feedback design

removes drive to either phase if grounded. At the same time the

other phase output amplitude is doubled.

Electronic balanced inputs are differential type on line inputs and

symmetrical long tail pair design on microphone input having

excellent CMRR. The preamps are designed so that the headroom

at the critical input stage is also 22dB. Low noise preamp design

achieves noise performance at line inputs superior to the output

noise of signal sources including dBx tape and 16 bit linear digital

playback.

The use of summing amplifiers for every output, main, or sub

system, ensures consistent performance with any module loading

format. Low noise amplifiers keep noise floors negligible. The

same high quality standards apply to all outputs. All inputs and

outputs except group insertion points are phase coherent.

Produkt Specifikationer

Mærke:	Allen & Heath
Kategori:	Ikke kategoriseret
Model:	Sigma

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