In the event of loss of power to the VSi55 while it is
turned on, the Power on/off switch will default to the “off”
position when power is restored. If the VSi55 is
unplugged, the Power on/off switch will default to the “off ”
position when it is plugged in again. In each instance you
must manually select the Power switch “on” position to be-
gin operation of the unit.
Should you lose power to the VSi55 or unplug it from its
power receptacle, and on initial power-up, it will default to
muted minimum volume level on the CD input and stereo
mode. After subsequent turn-on by the Power on/ o f f
switch, the VSi55 will return to the previously used
settings, but in the “mute” position.
N o t e :
Audio Research does
n o t
recommend leaving your
VSi55 “on” 24 hours a day as is the custom of some audio-
philes to achieve maximum sonic performance on demand.
While this is often recommended for solid-state equipment,
Audio Research does not recommend this procedure for
vacuum tube power amplifiers. (2,000 hours of tube life will
pass by in 84 days!)
MUTE/OPERATE SWITCH
:
This switch should always be
activated between listening uses or before switching
inputs, in addition to turning the Volume control down.
These two simple precautions will prevent inadvertent mis-
use of your VSi55 and help protect your power amplifier(s)
and speakers from unexpected transient signal pulses. In
“o p e r a te” position (indicated by unlit Mute LED), this
switch allows the signal to pass normally to the outputs.
C A U T I O N :
Do not turn up the Volume control beyond
normal listening levels when the VSi55 is in the “mute“
position. Always turn the Volume control down when
changing program sources, even when it is muted.
O P E R A TE/MUTE CIRCUIT LED
:
Note that for approxi-
mately 30 seconds after start-up the Mute LED will flash
until the automatic muting cycle is completed. None of the
front panel controls except for the Power on/off switch are
operable during the automatic muting cycle. Upon complet-
ing the automatic muting cycle, the unit will then be in the
manual “m u te” position (indicated by illuminated Mute
L ED) until the “o p e r a te” position is manually selected by
pressing the mute button once (so that the Mute LED
extinguishes).
RESETTING CONTROLS:
To
avoid discharging static to the
VSi55 controls, contact another surface (such as a metal
equipment rack) to drain away the charge before touching
the VSi55. If a static charge should “lock up” the micro-
processor making the front panel controls inoperable,
unplug the VSi55 from its power receptacle. After waiting
two minutes, plug in the VSi55 and power it up with the
rest of the system; the controls should resume normal op-
eration. If the problem persists, contact your dealer or Au-
dio Research Customer Service at 763-577-9700.
STEREO/MONO SWITCH:
Mono operation is indicated by
the lit Mono LED on the VSi55 front panel; when the
Mono LED is unlit the VSi55 is in stereo mode.
USE OF REMOTE CONTROL UNIT:
All front-panel func-
tions are duplicated on the remote control unit for the
VSi55. The life of the batteries in the remote control is
about 1 year. For replacement use only batteries of the type
RO3, UM4 or AAA.
Rear Panel Connections
INPUT CONNECTORS:
All five sets of SE inputs are clearly
marked to indicate use.
SUBWOOFER OUTPUT CONNECTOR:
This summed mono
output signal is for connection to the input of a power am-
plifier driving a subwoofer (such as a powered subwoofer).
6 – Output binding posts (+) and (-), L & R, for 4 or 8 ohm
speaker connection
1 – Power line cord inlet
1 – Power line fuse holder
4 – Pairs bias test jacks, one pair for each output tube
Installation
To insure normal component life and safe operation this
unit
must be operated only in a horizontal (upright) posi -
t i o n .
Adequate air flow and proper cooling thereby can
occur only if there is no restriction
below, behind and
above
the unit.
The four special non-marring elastomer feet provide
adequate spacing only from a smooth, hard surface.
Never
operate the unit while it is sitting on a surface such as
a rug or carpet.
If the unit is to be operated in an enclosed equipment
cabinet, an exhaust fan is desirable so as not to operate the
VSi55 in overheated ambient air. The “ambient” operating
temperature should never exceed 120º F or 49º C.
Improper installation will cause premature tube failure
and will affect your warranty, as well as the service life of
the unit.
Model VSi55
2
VSi55 Manual / 3-03 /
2-
17
-03
