ENGLISH
2
Signal Connections
(Optional ADC shown fitted)
XLR (Audio) Inputs and Outputs
All 3-pin XLR balanced audio connectors (Output, Mic IP
and EXT A/D IP) are wired as follows:
Pin 1
Screen/Chassis
Pin 2
Audio 0°
Pin 3
Audio 180°
Line IP and Insert Sends and Returns
1/4” balanced jack wired as follows:
Tip
Audio 0°
Ring
Audio 180°
Sleeve
Screen/Chassis
Inst. Hi Z IP
1/4” unbalanced jack wired as follows:
Tip
Audio 0°
Sleeve
Screen/Chassis
Mic IP/Line IP/Inst. Hi Z IP (front panel)
Any one of these inputs may be used as the input to the ISA
428 channels 1-4. Signals routed to these inputs are
referred to as the ‘internal’ channels or signal paths.
Outputs - Channels 1-4
These outputs are used as the main analogue signal outputs,
and are fed by whatever is connected to the Mic Inputs,
Line Inputs, or Instrument Inputs. These outputs also
connect to the ADC ‘internal’ channels 1-4 via the Soft
Limiter circuit.
Insert Send and Return
Allows an external unit, such as a Red 3 Compressor or
Red 2 EQ, to be placed within the signal chain, prior to the
output and post the high pass filter.
ADC Inputs 5-8
The ADC inputs 5-8 act as line level inputs and are used to
route ‘external’ signals to the optional ADC channels 5-8
via the Soft Limiter. Using these inputs in conjunction with a
single optional ADC card, up to eight analogue inputs can
be routed to the eight digital outputs. Using these inputs in
conjunction with a second ISA 428 unit and a single optional
ADC card, eight pre amps can be routed to all eight ADC
channels. (See ‘Signal Connections’ on page 8.)
Retrofitting the Optional ADC
The optional ADC can be retrofitted to a standard ISA 428
at any time. The card can be fitted easily by the user – no
engineering experience is required. Full fitting instructions
for this option are included along with the ADC.
