Bedienungsanleitung Allen-Heath iDR-8 (Seite 27 von 47) (Englisch)

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iDR-8 User Guide 27

XLR Analogue Inputs and Outputs

MIC/LINE Inputs Plug analogue microphone and line

sources in these inputs. The connections are differentially

balanced XLR with pin2 hot (+), pin3 cold (-) and pin 1 ground.

For unbalanced sources link pin 3 to pin 1 at the iDR input.

Phantom power +48V DC can be switched to XLR pins 2 and

3 for powering condenser microphones and other equipment

that needs phantom power. The voltage is fed through a 6.8k

ohm resistor to each pin.

 The Input Source window From within the Input

Channels window click on the Source button or the All button.

This opens the window with the input controls. The controls

shown are those associated with the physical input routed to

that channel through the source patchbay. Check that the

physical input number displayed is the same as the XLR input

you are working with.

 Selecting phantom power Open on the Source window

to access the +48V switch. If required, select +48V. Read the

warnings below.

To avoid loud clicks make sure that all channels fed

by the input are turned down or muted before you switch

+48V on or off or plug microphones into powered inputs.

Do not connect unbalanced sources or cables to the inputs

when +48V is selected. If phantom power is not required

make sure +48V is turned off.

 Selecting PAD Select the -20dB pad if you are plugging

in high level microphone or line sources. Open on the Source

window to access the -20dB switch.

 Setting GAIN Open on the Source window to access the

gain control. With audio active adjust the control so that the

meter averages around ‘0’ with loudest peaks no more than

‘+10’. The gain control ranges from +5 to +50dB gain, or -15

to +30dB gain with pad selected. Gain is adjusted in 3dB

steps.

Soft Limiter The limiter is an analogue circuit just before the

ADC converter. It can be switched in or out. It uses an opto

device to automatically limit the maximum signal level sent from

the input preamp to the converter. While the preamp stage can

be clipped, it does prevent clipping of the converter which can

result in the harsh distortion associated with digital equipment

if unexpected transient peaks are allowed to get through. The

limiter starts to work 4dB before clipping. Default setting is

limiter switched out.

 Selecting the limiter Open on the Source window to

access the limiter button. Switch it on or off as required.

LINE Outputs Connect these to line level equipment

such as amplifier inputs. Maximum output is +18dBu. Decide

the normal operating level according to headroom required.

Typical level is 0 or +4dBu. The connections are differentially

balanced XLR with pin2 hot (+), pin3 cold (-) and pin1 ground.

For unbalanced sources link pin 3 to pin 1 at the iDR output.

 The Output Source window Click on the XLR within the

Output Select window to open up its Analog Output window.

Check that the source channel number displayed is the one

you want to send to the output XLR.

IN 1

OUT 1

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