Power
IRIS is internally connectable for virtually all AC line-power
Connections
systems. Units not marked otherwise, on the rear panel, are
connected for 120 Vofts, 50-60 Hz.
Two SWITCHED outlets and one UNSWITCHED outlet (U.S.
120 Volt standards) are provided on the rear panel. The
UNSWITCHED outlet is provided for powering certain me-
chanical equipment, if so recommended by its manufacturer.
The SWITCHED
outlets
can be used for all other devices up to
a total (for all outlets) of 580 Watts (continuous-rating).
The IRIS power switch is very rugged and can sustain the turn-
on surge of large amplifiers. However, some audio purists
prefer to connect large power amplifiers through alternate line-
supply arrangements to minimize any added magnetic fields in
the low-signal environment of their preamplifier.
Input
IRIS employs a very low-noise, high-gain, complementary-
Connections
symmetry phono circuit of selectable gain, derived from our
and Selection
U.S. patent 4,496,910.
The phono stage output is selected by
(Phono)
the PHONOKEY and then, processed the same as other HIGH
LEVEL inputs.
The phono inputs (gold jacks) are compatible with normal
MOVING-MAGNET and HIGH-OUTPUT MOVING-COIL
cartridges (typically 2-5 mV), and LOW-OUTPUT MOVING-
COIL cartridges (typically 0.2-0.5 mV). Input impedance is 47k
ohms, except when optional cartridge loading is employed.
This is discussed at the end of this manual.
The rear-panel (MM/MC) switch (next to the phono jacks), when
depressed, increases phono-stage gain by 20dB for LOW-
OUTPUT MOVING-COIL cartridges.
CAUTION:
Never operate this switch, either way, unless the VOLUME
control is turned full down, as the very high gain present can
result in switching transients able to blow fuses in amplifiers or
loudspeakers, or damage some types of loudspeakers.
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Summary of Contents for IRIS
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