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Signal Connections
(Optional A/D Card shown fitted)
XLR (Audio) Inputs and Outputs
All 3-pin XLR audio connectors (Output, Mic IP, Line IP,
and EXT A/D IP) are wired as follows:
Pin 1
Screen/Chassis
Pin 2
Audio 0°
Pin 3
Audio 180°
Inst. Hi Z IP, Comp Key IP, Int A/D Direct
Input and Dynamic Link
1/4” jack wired as follows:
Tip
Audio 0°
Ring
Audio 180°
Sleeve
Screen/Chassis
Mic IP/Line IP/Inst. Hi Z IP
Any one of these inputs may be used as the main input to
the ISA 220. Signals routed to these inputs are referred to
as the ‘internal’ or ‘Int’ signal path.
Int A/D Direct Input
The ‘Internal A/D Direct Input’ is used to route an external
signal directly to the A/D card via the Limiter. It is fed to
the left channel of the A/D card and thus it replaces the
‘Internal’ signal feed to the A/D card (i.e. replaces whatever
is connected to the mic, line or instrument input.)
Ext A/D IP
The External A/D input is used to route an external signal
to the optional A/D card via the Limiter. The signal is fed to
the ‘spare’ side of the A/D card (the right channel, i.e. the
channel not being used by the internal signal) and so does
not replace it. Using this input, two ISA 220 units can be
used to create a stereo recording channel using only a single
A/D card.
Output
This output is used as the main analogue internal signal
output, and is fed by whatever is connected to the Mic IP,
Line IP or Inst IP, after this signal has been routed through
the EQ and dynamics modules.
Dynamic Link
You can connect two ISA 220 units (using a standard stereo
jack to jack lead between the DYNAMIC LINK sockets) to
allow the compressor sections to behave as a stereo pair of
processors. When connected in this way the dynamics
processors behave as if both units were receiving the same
level of signal, with both units responding to the higher level
of the two signal paths. The EQ channels can be matched
visually or aurally to be used as a stereo pair if required.
Retrofitting the Optional A/D Card
The optional A/D card can be retrofitted to a standard ISA
220 at any time. The card can easily be fitted by the user –
no engineering experience is required. Full fitting
instructions for this option are included with the card.
