Bedienungsanleitung Allen-Heath iDR-8 (Seite 11 von 47) (Englisch)

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iDR-8 User Guide 11

Physical inputs and outputs These are the

hardware audio connections including XLRs,

digital expanders, headphones and monitor.

Input and output channels These are

processing channels. The input channels can be

sourced from any physical input. The physical

outputs can be sourced from any output channel.

The input and output channels are interconnected

through the crosspoint matrix. They are routed to

and from the physical connections via the source

patchbays. The iDR-8 has enough processing

built in for 16 input and 16 output channels when

in 48kHz mode. The iDR-in and iDR-out

expanders simply convert the connected

analogue audio into digital signals to feed the

iDR-8 where they access the 16x16 matrix. The

expanders are not available when in 96kHz mode.

Analog inputs The iDR-8 and iDR-in each have

8 analogue XLR inputs. These feed high grade

balanced mic preamp circuits. They accept a

wide range of microphone and line level signals.

Gain, pad and 48V phantom power switching are

controlled using the iDR System Manager

software so they can be part of the recallable

patch system. There are no trimmers or internal

adjustments needed.

Soft limiter The output of each preamp is fed

through an analogue limiter just before the ADC.

The limiter uses an opto device to prevent

excessively high input signals overloading the

converters and causing harsh distortion.

Threshold is -4dBFS. The limiter can be switched

in or out under software control.

Analog outputs The iDR-8 and iDR-out each

have 8 analogue XLR line outputs. These are

balanced and can produce up to +18dBu

maximum signal level.

ADC and DAC converters These convert the

analogue signals into digital (ADC) and processed

digital signals into analogue (DAC). High grade

24bit converters are used.

Expander input and output 8 Channels of audio

is communicated between iDR units using these

RJ45 ports. The digital signals are fed to and from

the associated virtual patchbays. Routing the

signals through the patchbays in this way

provides the flexibility for common sources to be

networked between multiple iDR units using CAT5

cable.

Monitor inputs and outputs A front panel stereo

headphones output is provided. Balanced line

level L and R inputs and outputs are available on

the rear panel. The inputs feed the active monitor

bus and can also be routed into the source

patchbay. The outputs are fed from a patchbay

which gets its source from the active monitor bus

or any output channel. In this way these

connections can be used either as a monitor

system or as channels in their own right.

Signal generator Provides another selectable

source feeding the input channels through the

patchbay. Variable frequency sine wave, pink

noise, white noise or 1/3 octave band pass noise

can be selected. These can be used for system

line up and testing. The level is controlled using

the fader and mute function.

Source patchbays These connect the physical

inputs and outputs to the channels so providing a

flexible ‘virtual patchbay’ routing system. One

physical input can feed more than one input

channel. One output channel can feed more than

one physical output. Note that, as with any

physical patchbay, you cannot route two sources

into one channel, or two channels into one output.

Mix matrix This is the routing ‘heart’ of the

system fed by all 16 input channels, and feeding

all 16 output channels. It is known as a 16x16

crosspoint matrix. The signal can be switched or

have its level independently controlled at any

point. It is the matrix which provides the key to

independent multi-source zone routing and level

control.

The channel architecture illustrating the processing blocks is shown above.

For detailed instructions on using these please refer to the Help file which

comes with the iDR System Manager software.

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