Allen&Heath iDR-4 User Manual
Page 11
iDR-4 User Guide
11
Physical inputs and outputs These are the
hardware audio connections including XLRs, TRS
jacks and digital expanders.
Input and output channels These are
processing channels. The input channels can be
sourced from any physical input, the signal
generator or silence (turned off). The physical
outputs can be sourced from any output channel.
Outputs 5 and 6 can be sourced from any output
channel or the stereo monitor. 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-4 has enough processing
built in for 16 input and 16 output channels. The
iDR-in and iDR-out expanders simply convert
between analogue and digital audio to work with
the iDR-4 16x16 matrix.
Analogue inputs The iDR-4 has 2 analogue XLR
inputs feeding high grade balanced mic/line
preamp circuits which accept a wide range of
microphone and line level signals. The 4 TRS jack
inputs have gain controls to accept from -18dBu
to +12dBu line level signals. The iDR-in
expander has 8 analogue XLR mic/line inputs.
Gain, pad and 20V 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.
Analogue outputs The iDR-4 has 4 analogue
XLR and 2 TRS jack line outputs. These are
balanced and can produce up to +18dBu
maximum signal level. The TRS outputs 5 and 6
can be configured to be used with the stereo
monitor if required.
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
are 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 Physical inputs 5
and 6 can be configured as ripple through monitor
inputs so that signals across several linked iDR
units can be checked. Physical outputs 5 and 6
should be configured as the stereo monitor output
to drive a connected amplifier and speakers or
headphones.
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.
INPUT
+
-
ADC
GAIN
FADER
+20V
DAC
DAC
PAD
SOURCE
MIC/LINE
SIG GEN
FREQ
PEQ4
PHYSICAL INPUTS
GATE
COMP
FADER
MUTE
INPUT CHANNELS
MUTE
MIX
MATRIX
DUCKING
PAGER
DELAY
PEQ8
LIMIT
OUTPUT CHANNELS
GR
GR
SOURCE
DAC
5
6
PHYSICAL OUTPUTS
OUTPUT
ANALOG
M
M
M
M
M
M
M
M
M
NAME
NAME
M
HF SHELF
LF SHELF
BELL
HF FILTER
LF FILTER
XOVER FILTER
OSCILLATOR
PINK NOISE
WHITE NOISE
1/3 OCT BP
AMM
9
16
INPUT
EXPANDER
FADER
MUTE
1
4
9
16
OUTPUT
ANALOG
OUTPUT
EXPANDER
SOURCE
NAME
iDR
1,2
+
-
GAIN
INPUT
LINE
3,4,5,6
ADC
RIPPLE THROUGH SELECT
RELAY
RELAY
FILTER
16
M
GR
SIDECHAIN
ACTIVE
1
SEL
15+16
1+2
MONO
STEREO
SILENCE
FADER
ACTIVE MONITOR BUS
M
MUTE
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.