Your Optimus STAV-3670 Audio/Video Receiver is the perfect control center for
your audio/video system. It combines 100 watts-per-channel of clean power
with modern styling And, it provides connections for one tape deck, one audio/
video source, one more tape deck or audio/video playback source, a turntable,
a CD player, and a video monitor.
Digital-Synthesized Tuner
30 Memory Locations
Automatic Tu ning
Super Bass
Tape Monitoring
Built-In Protection Circuits
Remote Control
Y our receiver also has special sound options.
Dolby Pro Logic‘ Surround Sound
delivers movie theater sound for audio/video programs (especially those
encoded with Dolby Surround Sound signals).
wider sound field than ordinary playback.
of a recording studio, adding extra richness to your music.
Dolby 3CH Logic
Studio Effect
provides a
simulates the ambiance
Simulated Surround
gives you a surround-sound effect even when you listen to monaural sources.
Additional features include:
Precisely tunes to AM and FM stations.
Let you store and recall the frequencies for up to 30 AM/FM stations.
Searches for the next available AM/FM station.
Creates a richer, fuller sound by enhancing the bass portion of the program.
Lets you listen to the actual recording as you record, if your tape deck has a
tape-monitoring feature.
Automatically turn off the receiver to help avoid power surges or short circuit
damage.
Lets you use a single remote control for the receiver and other compatible com-
ponents connected to the receiver.
The remote control requires two AA batteries (not supplied).
Note:
We recommend you record the receiver’s serial number here. The number is on the receiver’s back panel.
Serial Number:_____________________________________________
Note to the Cable TV System Installer:
This reminder is provided to call the CATV system installer’s attention to A rticle 820-40 of the National Electrical Code t hat
provides guidelines for proper grounding and, in particular , specifies that the cable ground shall be connected to the grounding system of the building as close to the point of cable entry as practical.
Dolby, Pro Logic, and the double-D symbol () are trademarks of Dolby Laboratories Licensing Corporation.
Manufactured under license from Dolby Laboratories Licensing Corporation.
1997 Tandy Corporation.
RadioShack and Optimus are registered trademarks used by Tandy Corporation.
All Rights Reserved.
3
IMPORTANT SAFETY INSTRUCTIONS
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(
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This receiver is made and tested to meet exacting
safety stand ards. It meets both UL and FCC requirements
CAUTION
CAUTION
RISK OF ELECTRIC SHOCK.
DO NOT OPEN.
: TO REDUCE THE RISK OF
!
ELECTRIC SHOCK, DO NOT REMOVE
COVER OR BACK. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING
TO QUALIFIED PERSONNEL.
This sym bol is inte nded to al ert y ou to the
presence of uninsulated dangerous voltage
withi n th e sy stem’ s en cl os ure t ha t migh t be
of sufficient magnitude to constitute a risk
of el ectric shock. Do not open the system’s
case.
This symbol is intended to inform you that
important operating and maintenance in-
!
structions are included in the literature accompanying this system.
WARNING: T O REDUCE THE RISK OF
FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR
MOISTURE.
CAUTION
Power Line s —L ocat e an outdo or ante nna aw ay from
power li ne s.
Nonuse Periods —Unplug the receiver’s power cord
when you will not use it for extended periods.
Outdoor Antenn a Groun ding—I f an ou tsid e an tenn a
or cable sy stem is connecte d to the receiver, ground
the antenna or cable system so as to provide some
protection against voltage surges and built-up static
charges. Article 810 of the National Electrical Code,
ANSI/NFPA 80, provides information about proper
grounding of the mast and supporting structure,
grounding of the lead-in wire to an antenna discharge
unit, size of grounding conductors, location of antennadischarge unit, connection to grounding electrodes,
and requirements for the grounding electrode. See the
example below.
Antenna
Lead-In
Wire
Ground Clamp
Antenna
Discharge Unit
Electric
Service
Equipment
NEC -- National Electrical Code
(NEC Section 810-20)
Grounding Conductor
(NEC Section 810-21)
Grounding Clamps
Power Service Grounding
Electrode System
NECArticle 250,Part H
Careful attention is devoted to quality standards in the manufacture of your receiver, and safety i
a major factor in its design . However, safety is also your responsib ility.
This section lists important information that will help you properly use and enjoy your receiver an
accessories. Read all the included safety and operating instructions before using your receiver. Fol
low them closely, and retain them for future reference.
Heed Warnings — Follow all warnings on the product and in the operatin g instructions.
Cleaning — Unplug t his pr oduct f rom th e wall ou tlet b efore cleani ng. Us e only a damp cloth fo
cleaning. Do not use liquid or aerosol cleaners.
Attachments — Do not use attachments/accessories not recommended by the product manufac
turer, as they might create a hazard.
Water and Moisture — Do not u se th is pr oduc t nea r wat er (f or examp le, near a b atht ub, washbo wl
kitchen sink, or laundry tub; in a wet basement; or near a swimming pool).
Accessories — Do not place this product on an unst able cart, st and, tripod, bracket, or table . Th
product may fal l, causing serious injury to a child or adult, and serious dam age to the product. Us
only with a cart , stand, tripod, bracket, or table recommended by the manufacturer or sold with th
product. Follow the manufacturer's instructions for mounting, and use a recommended mountin
accessory.
Carts — Move the product on a cart carefully. Quick stops, excessive force, an
uneven surfaces may cause the product/cart to overturn.
Ventilation — Slots an d op enings i n the cabinet provid e ve nt ilation , e ns ur e re li
able operation, and protect from overheating. Do not block or cover these open
ings, and do not place the product on a bed, sofa, rug, or other similar surface. D
not pl ace the product in a built-in bookcase or rack unless it provides proper ven
tilat ion as specified by the manufacturer.
Power Sources — Operate th is pr oduc t usin g onl y the p ower sourc e ind icat ed on i ts marki ng la bel
If you are not sure of your home's power type, consult your product dealer or local power company
Polariz ation — This produ ct is eq uipp ed wi th a po lar ize d AC li ne pl ug ( a plu g hav ing on e b lad
wider than the other). This plug will fit in the power outlet only one way. This is a safety feature. I
you cannot insert the plug fully into the outlet, try reversing the plug. If the plug still doesn't fit, con
tact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the polar
ized plug. If you need an extension, use a polarized cord.
Power-Cord Protection — Route power-supply cords so they are not likely to be walked on o
pinched by items placed on or against them, paying particular attention to cords at plugs, conve
nience receptacles, and the point where they exit from the product.
Lightning — For ad de d p r ot ec t io n for th is product du ring a lightning storm, o r w he n it is left un at
tended an d unus ed fo r lo ng per i od s of t im e, un plug it fro m t he wall ou t le t and di sco nn ect the an te n
na or cabl e s yst e m. This w il l prev en t d am ag e to t h e p rodu ct du e t o li gh t ni ng an d p ow er- l ine s ur g es
Overloading — Do not ov erl oad wal l outle ts, ex tens ion cor ds, or in teg ral conv enie nce r ecept acles
as this can result in a risk of fire or electric shock.
Objects and Liquids — Never push objects of any kind into this product through openings, as the
may to uch da nger ou s volt ag e poin ts or short out pa rts that coul d resu lt in a fire or ele ctric sh ock
Never spill liquid of any ki nd on the product.
Servicing— Do not attempt to service this product yourself, as opening or removing covers ma
expo se yo u to dangero us vo lt age or oth er hazard s . R efe r all servic ing to qu al ifi ed servic e person
nel.
Damage Requiring Service — Unplug this product from the w all outlet and refer servicing to q ual
ified s ervice personne l under the follo wing conditions:
• When the power- s upply cord or plug is damaged.
• If liquid has been spilled or objects have fallen into the product.
• If the product h as been exposed to rain or water.
• If the product does not operate normally by following the operating instructions. Adjust onl
those controls that are covered by the operating instructions, as an improper adjustment o
other controls may result in damage and will often require extensive work by a qualified techni
cian to restore the product to normal oper ation.
• If the product h as been dropped or damaged in any way.
• When the product exhibits a distinct change in performance.
Replacement Parts — When repla c ement parts are required, be sure the service technician use
replacement parts spe c ified by the manufacturer or having the same characteristics as the origina
part. Unauthorized substitutions may result in fire, electric shock, or other hazards.
Safety Check — Upon completion of service or repairs to this product, ask the service technicia
to perform safety checks to determine that the product is in proper operating condition.
Wall or Ceiling Mount — The prod uct sh ould be mount ed t o a wall or ce iling only as rec ommen de
by the manufacturer.
Heat — The product should be situ ated away from heat sources such as radiators, heat re gisters
stoves, or other products (including amplifiers) that produce heat .
Caution: Make all the necessary connections before you plug in or turn on the receiver.
Positioning Speakers
a
L
Halfway Point
Halfway Point
Between Speak
b
b
Normal Listening Point
Person in Listening Area
• Surround speakers generally sound
best if you position them above ear
level.
• To avoid interference with the picture
on a nearby TV, use magnetically
shielded speaker systems. This is particularly important for the center
speaker since it is usually located
closest to the TV .
Between Speakers
a=b
R
a = b
Where you place your speakers (not supplied) can make a noticeable difference
in your system’s sound. The guidelines in this section will help you choose the
best locations. After you use your receiver for a while, you might want to try different locations for your speakers.
Bass response depends largely on speaker location. For strong bass, place the
speakers in the corners of the room. If you want even stronger bass, place the
speakers directly on the floor. If the bass is too strong, move the speakers
slightly away from the corners of the room, or raise them 6 to 18 inches off the
floor. You can buy speaker stands at your local RadioShack store.
The distance between the speakers should be about the same as the distance
between the normal listening point and the point halfway between the speakers.
If you place the speakers too close together, you reduce the stereo separation.
If you place them too far apart, you reduce the bass effect and create a
hole
in
the middle of the sound.
Most speakers have a tweeter dispersion angle of about 60 degrees. Ideally,
your listening position should be just inside the overlap area of the tweeter dispersion. You can angle the speakers toward you for better stereo effect.
To position your speakers for surround sound, place the A or B front speakers at
the front of your listening area, and place the (rear) surround speakers behind
or to the sides of the listening point (see “Using Advanced Sound Options” on
Page 20). Also, place the center speaker above, below, or behind the TV.
Sound might not appear to coincide with the picture if you place it beside the TV
TV
Front Left
Speaker
Rear Left
Speaker
Center Speaker
Listening
Front
Area
Rear
Front Right
Speaker
Rear Right
Speaker
Preparing Your Receiver
d
onnecting Speakers
Follow these guidelines when you select
and connect speakers.
• Only connect speakers that are rated
at between 8 and 16 Ohms.
• Be sure you properly connect all
speakers.
• Do not connect t wo pairs of speakers
to a single set of terminals (A or B) at
the same time. When you use two
pairs of speakers, conne ct one set to
Speakers A
B
.
and one set to
• Realistic, Optimus, and other highquality speakers have color-coded
speaker terminals (red for positive polarity and black for negative polarity).
Use these color-coded terminals as a
guide to help you properly connect the
speakers to the receiver.
• Use 16-gauge (or larger) speaker wire
for all speaker connections, and consider possible speaker locations before you decide how much speaker
wire you need.
Speakers
Preparing the Speaker Wires
Speaker wire consists of two conductors (individual wires) encased in insulation
and is usually color-coded or marked with a ridge along one side so you can
identify each conductor. Use these markings as a guide to help you properly
connect the speakers to your receiver.
Follow these steps to prepare the speaker wires.
Wire Stran
Wire Strands
Conductor
Speaker Wire
Wire Strands
Conductor
Conductor
1. Cut the speaker wires to the necessary length.
2. Separate the wires about 4 inches on each end.
3. Using a wire stripper, carefully strip about
end of each conductor.
4. Twist the end of each conductor to secure any loose wire strands.
Wire Strands
3
/4 inch of insulation from the
7
Preparing Your Receiver
-
L
R
PRE OUT
SUB
WOOFER
CENTER
SPEAKER
REAR
SPEAKERS
L
R
A
B
A
B
R
L
RL
FRONT SPEAKERS
AUDIO
IN
Subwoofer
Amplifiers
Center Speaker
Right
Right
Left
Left
Front A Speakers
Front B Speakers
RightFront Speakers BLeft
RightFront Speakers ALeft
Center Speaker
Amplified
Subwoofer
Note:
Be sure you connect the receiver’s right and left positive (+) and
negative (–) terminals to the speaker’s
corresponding right and left positive (+)
and negative (–) terminals.
Surround
Speakers
LeftRight
Connecting the A and B Speakers
Follow these steps to connect the right speaker to the receiver’s right
SPEAKERS A
1. Lift the receiver’s
2. Lift the receiver’s
terminals.
FRONT SPEAKERS A R
(+) red lever and insert the ridged
or color-coded conductor’s end into the small hole. Pull down the lever to
secure the conductor .
FRONT SPEAKERS A R (–
) black lever and insert the other
conductor’s end into the small hole. Pull down the lever to secure the con
ductor.
3. Connect the ridged or color-coded conductor’s loose end to the right
speaker’s positive (+) terminal.
FRONT
4. Connect the remaining loose conductor to the right speaker’s negative (–)
terminal.
Repeat Steps 1–4 to connect the left speaker to the receiver’s
left terminals.
A
Repeat this entire process to connect a second pair of speakers to the
SPEAKERS B
terminals.
FRONT SPEAKERS
FRONT
Preparing Your Receiver
Connecting Surround-Sound Speakers
You can connect a pair of speakers to the receiver for surround-sound programs. Follow the steps in “Connecting the A and B Speakers” to connect the
speakers to the
REAR SPEAKERS
terminals.
Connecting the Center Speaker
The center speaker gives additional ambience to surround sound. Follow the
steps in “Connecting the A and B Speakers” to connect the center speaker to
the
CENTER SPEAKER
terminals.
Connecting a Subwoofer Amplifier
Y our receiver includes a line-level subwoofer output. Connecting a subwoofer to
your system dramatically extends bass response for incredible richness and
depth. When you listen to surround-sound programs, a subwoofer enhances
your home theater experience by realistically recreating the rumble of an earthquake, the bone-jarring percussion of a cannon, and more. To use the subwoofer output, simply connect
level input or to an amplifier to which you have connected a subwoofer.
SUBWOOFER
to an amplified subwoofer’s line-
RadioShack stores sell a variety of suitable subwoofers and amplifiers.
9
Preparing Your Receiver
SIGNAL
GND
PHONO
TAPE2
MONITOR
CD
LD/
DVD
VCR/
TAPE 1
VIDEO
CONTROL
REC
PLAY
L
R
L
R
INOUT INININ
OUT
OUT ININ
TO MONITOR TV
VIDEO OUT
R
L
L
R
REC PLAY
LINE
REC
PLAY
INPUT OUTPUT
OUTPUT
L
R
CD
L
R
REC PLAY
LINE
REC
PLAY
INPUT OUTPUT
L
R
L
R
R
L
R
L
R
L
R
L
R
L
L
R
L
R
R
L
Connecting Program Sources
Note:
Use shielded audio cables with
phono connectors for all audio connections.
You can connect up to five external program sources to your receiver.
TurntableCassette DeckCassette DeckCD Player
Note:
If you place the c assette deck directly above, below, or to the left of the
receiver, the receiver could interfere with
the cassette deck’s operation. If possible, position the cassette deck to the
right of the receiver or locate it away
from the receiver.
Connecting a Turntable
Connect a turntable with a magnetic cartridge only. Some older turntables use a
ceramic-type cartridge that does not work with this system.
Connect the turntable’s left and right cables to the receiver’s
PHONO
jacks. Then connect the turntable’s ground wire to the receiver’s
GND
terminal.
L
(left) and R (right)
Connecting a CD Player
To connect a CD player to the receiver, connect the CD player’s left and right
L
output jacks to the receiver’s
and
R CD IN
jacks.
Connecting Cassette Decks
Y ou can connect cassette decks to the
Connect the cassette deck’s output jacks to the
MONITOR PLAY
OUT
1
(audio) or
jacks, and connect the cassette deck’s input ja cks to the
TAPE 2 MONITOR REC
You can connect a third cassette deck (for playback only) to the
(audio) jacks.
VCR/TAPE 1
jacks.
and the
TAPE 2 MONITOR
VCR/TAPE 1 IN
(audio) or
LD/DVD IN
SIGNAL
jacks.
TAPE 2
VCR/TAPE
Preparing Your Receiver
OUTININ
VIDEO
REC
PLAY
INOUTINININ
L
R
PHONO
V
V
TAPE2
MONITOR
SIGNAL
GND
V
R
V
OUT
VIDEO
IN
L
RECPLAY
REC
INPUT OUTPUT
L
AUDIO
L
R
R
PLAY
VCR/
TAPE 1
L
R
R
LD/
DVD
L
TO MONITOR TV
CD
R
L
R
L
AUDIO
OUT
VIDEO OUT
L
OUT
R
CONTROL
v
V
VIDEO
OUT
L
R
v
V
VIDEO
IN
Note:
If your VCR is monaural, use a Yadapter (available at your local RadioShack store) to connect the VCR’s
audio output to both the
and R audio in-
L
puts on the receiver.
VCR
VCRLD/DVD PlayerTV Monitor
Connecting Video Sourc es
If you connect two video sources, such as VCRs, laser disc (LD) players, or digital video disc (DVD) players to your receiver, you can use the receiver to select
each video source. You can also use the receiver to easily record from these
video sources to the source connected to
VCR/TAPE 1
.
Connect phono cables from each video source’s audio outputs to the receiver’s
VCR/TAPE 1
receiver’s
or
LD/DVD IN
VCR/TAPE 1 OUT
(audio) jacks. Then connect phono cables from the
(audio) jacks to the source’s audio input jacks.
Connect video cables from each video source’s video outputs to the receiver’s
VCR/TAPE 1
receiver’s
or
LD/DVD VIDEO IN
VCR/TAPE 1 VIDEO OUT
jacks. Then connect video cables from the
jack to the source’s video input.
Connecting a Video Monito r
The monitor (or TV with baseband video input) you connect to the
minal can monitor any program you connect to the receiver’s
input jacks. Connect a video cable from the receiver’s
DVD
jack to the monitor’s video input.
TOR TV
VCR/TAPE 1
VIDEO OUT TO MONI-
VIDEO OUT
or
ter-
LD/
10
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