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OPERATION
Turn-On/Off
logic
Muting System
Volume/
Balance System
CAUTION:
The EPL switch and the tape MONITOR switches, explained
later, are often the cause of an apparently “dead” system, when
they have accidentally been left engaged. Always check them
first if a system is found “dead” on turn-on. For now, make sure
that all six of the group of round-button switches are in theirOUT
position.
When IRIS is powered-up, the MUTE legend will light alone,
along with a small GREEN indicator, between the knobs, called
the VOLUME/BALANCE (V/B) indicator. The V/B indicator
shows that the IRIS panel knobs are determining VOLUME and
BALANCE. Its operation is explained in the remote section.
During this period, none of your KEY inputs will be accepted into
memory. This period is about five seconds, during which the
MAIN outputs of the preamplifier are muted.
At the end of this turn-on safety period, the MUTE indicator will
go out and the TUNER legend will light. TUNER mode is
designed as a reset state to facilitate easiest turn-on for
background music etc. Any of the other seven inputs may now
be selected by their appropriate KEY.
The MUTE KEY causes the MUTE light to illuminate, and the
preamp to fade down approximately 20dB. This mode is used
for phono cueing and at any other convenient time, such as
answering a phone etc. Depressing the
NORMal
KEY restores
normal level. The two-key format is used so that you always
know whether you are muting or de-muting.
The level-control system in IRIS is unusual and uniquely suited
to our goal of combining superb sound with high convenience.
It is an indirect type in which no audio signals are passed
through the panel controls.