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Model SP17
MUTE/OPERATE SWITCH: In "mute" position (indicated
by LED illumination), shorts all outputs of the preamplifier
to allow listening interruptions for telephone answering or
other reasons. 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 misuse of your
SP17 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.
PROCESSOR/INPUT SWITCH [PROC]: The "processor"
mode setting (only the Proc LED is lit) bypasses all other
front panel control functions (except Power on/off), and
output defaults to stereo mode and is at unity gain, allow-
ing an external surround sound processor to control the
system level. In the "non-processor" normal input mode
(Proc LED unlit), normal program input selection is
controlled by the Input selector (phono, CD, tuner, video
and aux). Note that when switching to normal input
operation after using the processor mode position, the
Volume control will be at minimum level setting.
C A U T I O N : Do not turn up the Volume control beyond
normal listening levels when the SP17 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
LED) until the "operate" position is manually selected.
RESETTING CONTROLS: To avoid discharging static to the
SP17 controls, contact another surface (such as a metal
equipment rack) to drain away the charge before touching
the SP17. If a static charge should "lock up" the micro-
processor making the front panel controls inoperable, put
the SP17 in mute, power down the system and turn off and
unplug the SP17 from its power receptacle. After waiting
60 seconds plug in the SP17 and power it up with the rest
of the system; the controls should resume normal opera-
tion. If the problem persists, contact your dealer or Audio
Research Customer Service at 763-577-9700.
USE OF REMOTE CONTROL UNIT AND STEREO/MONO
O P E R A T I O N: All front-panel functions are duplicated on
the remote control unit for the SP17, with an additional
stereo/mono switch only on the remote (labeled Mono).
Mono operation is indicated by the lit Mono LED on the
SP17 front panel; when the Mono LED is unlit the SP17 is
2
in stereo mode.
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.
Connections
INPUT CONNECTORS: All six sets of SE inputs are clearly
marked to indicate use.
MAIN OUTPUT CONNECTORS: There are two sets of
single-ended output connectors. Either or both sets may be
connected simultaneously to your crossover or amplifier(s)
as necessary.
RECORD OUTPUT CONNECTORS: The SP17's Tape out-
puts (labeled "Record" output) should be connected to your
tape deck's "REC" or "LINE" inputs. These outputs supply
whatever is selected by the Input selector switch to the
tape deck for recording. Level is non-variable and approxi-
mately the same as the output level of the selected input
source.
12V REMOTE OUTPUT JACK: The +12VDC output jack
(100mA max) located on the SP17 rear panel provides
continuous control voltage for remote start relays in power
amplifiers and other electronics, whenever the SP17 is
turned on.
Installation Instructions
While the SP17 does not dissipate an unusual amount
of heat, it is important that it be provided with reasonable
airflow to assure long, trouble-free operation. In addition,
the following installation guidelines will help insure maxi-
mum sonic performance as well as reliable service.
1. Operate unit in upright and horizontal position, prefer-
ably on solid, non-metal shelving.
2. Do not stack the SP17 on top of a power amplifier: not
only could this cause overheating, but hum may be
introduced into the SP17 from the proximity of the
amplifier's power transformer. Do not stack components
or other objects directly on top of the SP17.
3. Do not place or operate your SP17 on a soft or
irregular surface such as a rug. This will prevent proper
ventilation.
4. Do not operate your SP17 without the top and bottom
covers installed. These are required both for
safety as well as shielding from interference (except in
service operations by qualified personnel).
5. In a cabinet installation which has an enclosed back, an
exhaust fan is desirable so as not to operate the SP17 in
overheated ambient air. Operation of vacuum tube equip-
ment for long periods of time in hot ambient air will
shorten tube life and increase chance of failure of other
component parts.
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