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Model SD135
Preface
Please take time to carefully read and understand the
following instructions before you install or attempt to oper-
ate this equipment. Becoming familiar with the product
and its correct operating procedures will help assure you of
maximum musical enjoyment and reliable operation. The
effort you invest now will be well rewarded in the years
ahead.
Warnings
1. To prevent fire or shock hazard, do not expose this
product to rain or moisture.
2. This unit operates on voltages which can cause serious
injury or death. Do not operate with covers removed.
Any necessary servicing should be carried out by your
authorized Audio Research dealer or other qualified
personnel.
3. The 12 gauge, 3-conductor power cord on this unit is
equipped with a standard 3-prong grounding plug. If
used normally, it will provide a safe earth ground
connection of the chassis. Refer to section on "AC Power
Connections" for detailed information.
4. For safe operation and protection against fire hazard,
replace fuses only with those of the same type and
rating of fuses as specified.
Packaging
Save all packaging accompanying this product. You have
purchased a precision electronic instrument, and it should
be properly cartoned any time shipment becomes neces-
sary. It is very possible that this unit could be damaged
during shipment if repackaged in cartoning other than that
designed for it. The original packaging materials help pro-
tect your investment from unnecessary damage, delay and
added expense whenever shipment of this unit is required.
Unpacking
The SD135 is packed within two cartons (inner and outer)
which have foam supports in between. Because of the
weight of the unit and because it is a precision electronic
instrument it is necessary to take reasonable care during
unpacking and preparation for use.
It is best to have a large, open work area with available
help. Set the carton upright in the center of the work area
and with a small knife carefully slit the taped edges of the
outer carton's top flaps. Fold the flaps to the sides and
while holding the inner carton in place, roll the unit upside
down. You can now lift the outer carton off and set it and
the filler panels aside. Now slit the inner carton's taped
seams on the bottom (now facing upward). Again, fold
the flaps over and while holding the unit in, roll it over
as before. You can now lift the inner carton off to find
your SD135 sitting upright, undamaged and uncartoned.
Carefully remove the plastic wrap. Now, while it is fresh in
your mind, reassemble the carton system for future use.
Accessories
Spare Fuses:
2 – MDQ5A 5 Amp slo-blo (100 & 120v)
2 – T3A Amp slo-blo (220 -240V)
2 – Gold jumpers for SE operation
Description of Controls
The front panel has:
1 Power line On-Off switch
1 Power "On" LED (Green) indicator
1 "Stand-by" LED (Yellow) indicator
POWER ON-OFF SWITCH: Press the black rocker switch
to initiate or terminate AC line power to the amplifier.
When the LED is illuminated the amp is "on" and ready to
play.
Connections
The rear panel has:
2 – RCA input connectors, for single-ended connections,
L & R
2 – XLR input connectors, for balanced connection, L & R
4 – Output binding posts, (+) and (-), L & R
1 – Power line fuseholder
1 – Power line cord IEC connector for removable power
cord (supplied)
2 – 12V remote start in and out jacks
IMPORTANT: Use the best available speaker wires and in-
terconnects. As your system improves in resolution from
the addition of quality components, it becomes increasingly
important to avoid the limitations of inferior system inter-
connections.
It is important sonically that your entire system be con-
nected so that the audio signal arriving at the speakers has
correct absolute polarity or phase (i.e. is n o t i n v e r t e d ) .
Connect the black or (-) speaker terminal to the wire that
connects to the appropriate-channel (-) gold binding post
on the amplifier. Connect the red or (+) speaker terminal to
the wire that connects to the appropriate-channel (+) bind-
ing post on the SD135. Tighten the binding posts firmly to
assure good contact for best sonic results.
For "b i - w i r ed" loudspeaker systems (i.e. running separate
wires to bass and treble speaker terminals), simply repeat
the above instructions, taking care that all connections
have the same (+) or (-) polarity.
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