Radio Shack Stereo Amplifier 04A00 User Guide

Owner’s Manual  
Please read before using this equipment.  
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ˆ Contents  
Contents .................................................................................................................................. 2  
Features .................................................................................................................................. 3  
Preparation ............................................................................................................................. 4  
Presetting the Controls ...................................................................................................... 4  
Presetting Audio Input Devices .................................................................................. 4  
Presetting the Amplifier .............................................................................................. 4  
Mounting the Amplifier ...................................................................................................... 4  
Placing the Speakers ........................................................................................................ 4  
Connections ............................................................................................................................ 5  
Connecting an Input Source .............................................................................................. 5  
Unbridged Connection ............................................................................................... 5  
Bridged Connection ................................................................................................... 5  
Grounding the Input Source .............................................................................................. 6  
Connecting Speakers ........................................................................................................ 6  
Preparing the Speaker Wires ..................................................................................... 6  
Unbridged Connection ............................................................................................... 6  
Bridged Connection ................................................................................................... 7  
Using the Switched AC Outlet ........................................................................................... 7  
Connecting Power ............................................................................................................. 7  
Using Your Amplifier .............................................................................................................. 8  
Using the Meters/METER RANGE .................................................................................... 8  
CLIP Indicator ................................................................................................................... 8  
Using SPEAKER A/B ........................................................................................................ 8  
Monitoring the Sound Sources .......................................................................................... 8  
Listening Safely ......................................................................................................... 9  
Care ......................................................................................................................................... 9  
Replacing the Fuse ........................................................................................................... 9  
The FCC Wants You to Know .............................................................................................. 10  
Specifications ....................................................................................................................... 11  
©
1998, 2000 Tandy Corporation.  
All Rights Reserved.  
RadioShack is a registered trademark used by Tandy Corporation.  
2
Contents  
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ˆ Features  
Input Jacks  
audio input sources for music and special ef-  
fects.  
Your Public Address Amplifier gives you the  
versatility and power you need in a profes-  
sional sound system. Its wide frequency re-  
sponse easily handles amplification of voice  
and music. Use it in meeting halls and audi-  
toriums, at sports events, in schools, and in  
the office for paging systems — anywhere  
you need to deliver special announcements  
with excellent sound.  
—let you connect a variety of  
A/B SPEAKER Switches  
speakers you want to use with the amplifier.  
— let you select the  
STEREO/MONO Switch  
output type; stereo or mono (bridged).  
— lets you select the  
Binding Post Terminals  
— let you easily  
connect wires directly to the amplifier.  
The amplifier (if bridged) produces up to 350  
watts of clean, powerful sound with minimum  
distortion.  
Switched AC Outlet  
— lets you power other  
devices by plugging them into the back of the  
amplifier.  
Your amplifier includes these features:  
10 50000 Hz Frequency Response  
WARNING  
: To reduce the risk of fire or  
Built-In Cooling Fan  
amplifier by reducing its internal tempera-  
ture.  
— helps protect the  
shock hazard, do not expose this product  
to rain or moisture.  
Two Mounting Options  
the amplifier in a standard-sized audio equip-  
ment rack or on a desk, shelf, or table.  
— you can mount  
CAUTION  
RISK OF ELECTRIC SHOCK.  
!
DO NOT OPEN.  
2 Lighted VU Meters  
fier’s output for each channel in decibels.  
— measure the ampli-  
CAUTION  
: TO REDUCE THE RISK OF  
ELECTRIC SHOCK, DO NOT REMOVE  
COVER OR BACK. NO USER-SERVICE-  
ABLE PARTS INSIDE. REFER SERVICING  
TO QUALIFIED PERSONNEL.  
Left and Right Output Level Gain Controls  
— let you adjust the overall sound level on  
the left and right channels.  
Clipping Indicator  
source signal overdrives the amplifier.  
— lights if a sound  
This symbol is intended to alert you to  
the presence of uninsulated danger-  
ous voltage within the product’s enclo-  
sure that might be of sufficient  
magnitude to constitute a risk of elec-  
tric shock. Do not open the product’s  
case.  
Phones Jack  
— lets you connect head-  
phones so you can listen privately.  
Bridging Capability  
— you can combine the  
amplifier’s two channels and use the amplifi-  
er with only one channel, producing a total of  
350 watts.  
This symbol is intended to inform you  
that important operating and mainte-  
!
nance instructions are included in the  
literature accompanying this product.  
Meter Range Select Switch  
trol the meter’s sensitivity.  
— lets you con-  
3
Features  
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ˆ Preparation  
PRESETTING THE  
CONTROLS  
MOUNTING THE AMPLIFIER  
You can mount the amplifier in a standard-  
sized audio equipment rack or on a desk,  
shelf, or table. Before you use your amplifier,  
be sure you place it in a location with ade-  
quate ventilation. Do not put it on thick car-  
peting (which can restrict air flow) or near a  
heat source such as a heat vent or radiator  
(which can cause it to overheat).  
Before you begin making connections or us-  
ing your amplifier, preset the audio input  
source’s and the amplifier’s controls to avoid  
overdriving a channel or producing sudden  
unexpected loud sounds.  
Warning:  
To prevent possible hearing loss,  
set the audio input device’s and amplifier’s  
controls as indicated in the following sec-  
tions. After you turn on the amplifier or  
change the program source, adjust the con-  
trols to a comfortable listening level.  
To mount the amplifier on a standard-sized  
audio equipment rack, drive and tightly se-  
cure mounting screws (not supplied) through  
the mounting holes.  
PLACING THE SPEAKERS  
Presetting Audio Input Devices  
Speaker placement depends on your room’s  
size and arrangement. We recommend you  
play a wide-range recording and experiment  
with speaker placement until you find the lo-  
cations that result in the best sound. For the  
best results, point the speakers toward the  
audience (especially if the speakers are far  
apart) so the coverage areas overlap to pre-  
vent dead spots (areas not covered by the  
speakers’ sound). Position the speakers  
slightly above the level of the listeners’  
heads (see “Connecting Speakers” on  
Page 6).  
Always set the power control for an audio  
mixer or preamplifier you connect to the am-  
plifier to OFF.  
Presetting the Amplifier  
Set the amplifier’s controls as follows:  
Control  
Setting  
Out  
POWER  
SPEAKER A/B  
LEFT and RIGHT  
METER RANGE  
Out  
MIN  
Out  
4
Preparation  
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The following drawings show recommended  
speaker placements for typical, narrow, and  
wide sound coverage.  
Typical Coverage  
Narrow Coverage  
(single speaker)  
Wide Area Coverage  
(two speakers)  
ˆ Connections  
is off and the AC power cord is not  
plugged in.  
CONNECTING AN INPUT  
SOURCE  
You can connect a component such as an  
audio mixer or preamplifier to the inputs on  
the back of your amplifier. Each input (la-  
Unbridged Connection  
If you are connecting more than one speaker  
on the same channel (unbridged connec-  
tion), connect your audio mixer’s or preampli-  
INPUT  
INPUT MONO  
) has a bal-  
beled  
and  
anced and unbalanced jack. You need a  
shielded cable with a 1/4-inch (6.35-mm)  
phono plug to connect to an unbalanced jack  
or a cable with a phono-type plug to connect  
to a balanced jack. To prevent hum and oth-  
er noise, use low-capacitance shielded ca-  
ble. Your local RadioShack store carries a  
wide selection of audio components, parts,  
and cables.  
INPUT  
fier’s left and right output jacks to the  
R
INPUT L  
jacks on the back of the ampli-  
and  
STEREO/MONO  
fier. Then, make sure  
on the  
STEREO  
back of the amplifier is set to  
.
Note:  
MIC  
level inputs,  
If you are using the  
you must connect an audio mixer or pre-am-  
plifier to this amplifier.  
Bridged Connection  
Cautions:  
If you are connecting high-power speakers  
that can handle a power output of 350 watts  
(bridged connection), connect your audio  
You can connect audio mixers or pream-  
plifiers to either the balanced or unbal-  
anced jacks. Do not connect input  
sources to both jacks at the same time.  
IN-  
mixer’s or preamplifier’s output jack to the  
PUT MONO  
INPUT L  
jack on the back of the  
or  
• Before you make any connections, be  
POWER  
sure  
on the front of the amplifier  
5
Connections  
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STEREO/MONO  
amplifier. Then, make sure  
speakers, use this table to determine the  
wire length and choose the appropriate  
gauge.  
MONO  
on the back of the amplifier is set to  
.
Wire Length  
25 feet or less  
Over 25 feet  
Wire Gauge  
18 gauge  
16 gauge  
GROUNDING THE INPUT  
SOURCE  
To prepare the speaker wire, remove about 1  
inch of insulation from the end of the speaker  
wire you are connecting to the amplifier.  
Then twist the exposed wire to secure all of  
the wire strands.  
To avoid a low frequency hum, connect your  
audio mixer’s or preamplifier’s ground wire  
GND  
(usually black or green) to the  
on the back of the amplifier.  
terminal  
Split strands  
about 4”  
Wire Strands  
CONNECTING SPEAKERS  
1"  
You can connect one or more 4-, 8-, or 16-  
ohm speakers to the amplifier. You can also  
bridge the amplifier’s channels.  
Unbridged Connection  
A
B
The amplifier has two channels: and . If  
you connect two pairs of speakers, follow  
these guidelines:  
Use this connection if you are connecting  
more than one speaker on the same channel  
or if you do not have high-power speakers.  
• Speakers connected to the same chan-  
A
B
nel ( or ) are part of a pair and must  
1. Connect the speaker  
wires to the corre-  
sponding left and right  
speaker’s positive (+)  
and negative (–) ter-  
minals.  
be of the same impedance.  
• Speakers connected to different chan-  
A
B
nels ( or ) are not part of a pair and  
can be different impedances.  
Most speaker terminals are color-coded or  
have a mark that indicates the terminal’s po-  
larity. Usually, terminals with positive polarity  
are red or have a plus symbol (+), and termi-  
nals with negative polarity are black or have  
a minus symbol (–). Phasing is correct when  
you connect + to + and – to –.  
2. Connect the other end of the left and  
right speaker’s positive (+) and negative  
(–) wires to the amplifier’s correspond-  
SPEAKERS LEFT  
SPEAKERS  
and  
ing  
Preparing the Speaker Wires  
Use the shortest length of wire possible to  
connect the speakers. After placing the  
6
Connections  
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RIGHT  
SPEAKERS RIGHT  
terminals for each channel (as  
terminals (as shown  
shown here).  
here).  
Note: SPEAKERS RIGHT (+)  
amplfier is used as a negative (–) termi-  
nal for a bridged connection.  
on the  
To connect the  
speaker wires to  
the amplifier, turn  
STEREO/MONO  
3. Make sure  
is set to  
the knob on the  
MONO  
.
terminal counter-  
clockwise until it  
stops, insert the bare wire inside the  
space between the knob and the ampli-  
fier, then turn the knob clockwise until it  
stops to secure it.  
USING THE SWITCHED AC  
OUTLET  
The amplifier’s switched AC outlet provides a  
source of 120 V, 60 Hz power for audio  
STEREO/MONO  
STE-  
is set to  
3. Make sure  
POWER  
equipment you connect to it.  
on the  
REO  
.
amplifier turns both the amplifier and the au-  
dio equipment connected to this outlet on or  
off.  
Bridged Connection  
Use this connection only if you have high-  
power speakers that can handle a power out-  
put of 350 watts.  
CONNECTING POWER  
To connect the amplifier to power, plug the  
attached power cord into a standard AC out-  
let.  
Important:  
For a bridged connection, do not  
connect any speaker wires to the black  
SPEAKERS  
terminals.  
Your amplifier’s fuse (located on the amplifi-  
er’s back panel) protects the amplifier from  
voltage surges. If the amplifier does not work  
1. Connect the speaker wires to the  
speaker’s positive (+) and negative (–)  
terminals.  
POWER  
when you press  
, check the fuse. If it  
is blown, see “Replacing the Fuse” on  
Page 9 to replace it.  
2. Connect the other end of the speaker’s  
positive (+) and negative (–) wires to the  
SPEAKERS LEFT  
amplifier’s red  
and  
7
Connections  
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ˆ Using Your Amplifier  
1. Start the input sound source.  
nal exceeds the output power level you set  
LEFT  
RIGHT  
, warning you of possi-  
using  
and  
LEFT  
RIGHT  
on the front  
2. Make sure  
and  
ble damage to the amplifier. If this happens,  
reduce the output level of the connected  
MIN  
of the amplifier are set to  
.
LEFT  
RIGHT  
until the in-  
sound source or  
and  
POWER  
3. Press  
to turn on the amplifier.  
dicator flickers only at peak volume levels.  
LEFT  
RIGHT  
to  
4. One at a time, adjust  
and  
USING SPEAKER A/B  
the desired volume level.  
SPEAKER A  
SPEAKER B  
on the  
Press in  
or  
LEFT  
RIGHT  
Turn  
and  
or  
clockwise to  
front of the amplifier for the channel you want  
to listen to. Or, press in  
increase  
counterclockwise to  
SPEAKER A  
and  
decrease the corresponding left and  
right output power. To get the best per-  
formance with the least sound distortion,  
SPEAKER B  
to listen to all connected speak-  
ers.  
LEFT  
RIGHT  
so the  
always adjust  
and  
Caution:  
If you connected 4 ohm speakers  
meter’s pointer does not continuously  
swing to the extreme right.  
to the amplifier, to avoid damage do not set  
SPEAKER A  
both  
position.  
SPEAKER B  
to the in  
and  
POWER  
5. When you finish, press  
off the amplifier.  
to turn  
MONITORING THE SOUND  
SOURCES  
USING THE METERS/METER  
RANGE  
To monitor the sound sources directly from  
the amplifier, connect a pair of mono or ste-  
reo headphones with a 1/4-inch (6.35-mm)  
The position of the pointers on both of the  
amplifier’s meters indicate the output power.  
Built-in lamps light to make the meters easy  
to see in dark areas.  
PHONES  
plug into the  
jack on the front of the  
amplifier. Using headphones lets you easily  
check and adjust the sound source’s bal-  
ance.  
METER RANGE  
controls the sensitivity of both  
meters. When output power is too strong, a  
meter’s needle might continuously swing to  
the extreme right and damage or reduce the  
accuracy of the meter.  
Note:  
Your local RadioShack store carries a  
wide selection of headphones.  
If the meter’s needle continuously swings to  
METER RANGE  
the extreme right, press  
to  
the out position to maintain a 0 dB gain for  
METER RANGE  
the meter. Or, press  
to the in  
position to allow a 20 dB gain.  
CLIP INDICATOR  
The CLIP indicator on the front of the amplifi-  
er lights steadily when a sound source’s sig-  
8
Using Your Amplifier  
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• Do not listen at extremely high volume  
levels. Extended high-volume listening  
can lead to permanent hearing loss.  
Listening Safely  
To protect your hearing, follow these guide-  
lines when you use headphones.  
• Once you set the volume, do not  
increase it. Over time, your ears adapt  
to the volume level, so a volume level  
that does not cause discomfort might  
still damage your hearing.  
• Set the volume to the lowest setting  
before you begin listening. After you  
begin listening, adjust the volume to a  
comfortable level.  
ˆ Care  
To enjoy your PA Amplifier for a long time:  
1. Unplug the amplifier from the AC outlet.  
• Keep the PA Amplifier dry. If it gets wet,  
wipe it dry immediately.  
2. Turn the fuse holder cap on the back of  
the amplifier in the direction of the arrow,  
then pull out the cap to remove the fuse.  
• Use and store the PA Amplifier only in  
normal temperature environments.  
• Handle the PA Amplifier gently and  
carefully. Do not drop it.  
• Keep the PA Amplifier away from dust  
and dirt.  
• Wipe the PA Amplifier with a damp cloth  
occasionally to keep it looking new.  
Modifying or tampering with the  
PA Amplifi-  
’s internal components can cause a mal-  
er  
function and might invalidate its warranty. If  
your is not performing as it  
PA Amplifier  
3. If the fuse is blown, replace it. Use only  
an identical fuse with the proper rating.  
The fuse must be 7 amps.  
should, take it to your local RadioShack store  
for assistance.  
REPLACING THE FUSE  
Insert the fuse into the fuse holder’s socket,  
press the fuse holder back into the amplifier,  
then turn the fuse holder’s cap clockwise to  
tighten it.  
If the amplifier does not operate, you might  
need to replace the fuse on the back of the  
amplifier with another 7-amp, 250-volt fuse.  
Important:  
Let the amplifier cool down and  
see if it starts again before you assume a  
fuse needs to be replaced.  
Caution:  
Do not use a fuse with ratings other  
than those specified. Doing so might damage  
your amplifier.  
9
Care  
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ˆ The FCC Wants You to Know  
Your amplifier might cause TV or radio inter-  
ference even when it is operating properly.  
To determine whether your amplifier is caus-  
ing the interference, turn off your amplifier. If  
the interference goes away, your amplifier is  
causing it. Try to eliminate the interference  
by:  
• moving your amplifier away from the  
receiver  
• contacting your local RadioShack store  
for help  
10  
The FCC Wants You to Know  
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ˆ Specifications  
Input Impedance..........................................................................................................20 kOhms  
Continuous Output Power  
Stereo at 1 kHz .............................................................................. 125 Watts × 2 (8 ohms)  
Stereo at 1 kHz .............................................................................. 175 Watts × 2 (4 ohms)  
Bridged at 20 Hz to 20 kHz .................................................................. 250 Watts (8 ohms)  
Bridged at 1 kHz .................................................................................. 350 Watts (8 ohms)  
Total Harmonic Distortion ................................................................................ 0.1% at 80 Watts  
Frequency Response (10 Hz – 50 kHz) ............................................................................ ±3 dB  
Input Sensitivity .............................................................................................................. 0.775 V  
Signal-to-Noise Ratio ................................................................................... 90 dB (A-weighted)  
A B  
A B  
+
Speaker Impedance .......................................................................................  
,
(4–16 ohms)  
(8–16 ohms)  
Bridged (8–16 ohms)  
Power Requirement ........................................................................................... 120V AC 60 Hz  
Dimensions (HWD) ............................................................................... 55/6 × 19 × 141/4 Inches  
(11.4 × 48.2 × 30.5 cm)  
Weight .......................................................................................................................... 27.53 lbs  
(12.5 kg)  
Specifications are typical; individual units might vary. Specifications are subject to change and  
improvement without notice.  
11  
Specifications  
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Limited One-Year Warranty  
This product is warranted by RadioShack against manufacturing defects in material and workman-  
ship under normal use for one (1) year from the date of purchase from RadioShack company-owned  
stores and authorized RadioShack franchisees and dealers. EXCEPT AS PROVIDED HEREIN, Ra-  
dioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES, INCLUDING  
THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED  
IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES CONTAINED  
HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL HAVE NO LIABILITY OR RE-  
SPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RESPECT TO ANY  
LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR PERFOR-  
MANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WARRANTY, IN-  
CLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVENIENCE, LOSS  
OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT, SPECIAL, INCIDEN-  
TAL, OR CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN ADVISED OF THE  
POSSIBILITY OF SUCH DAMAGES.  
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limita-  
tion of incidental or consequential damages, so the above limitations or exclusions may not apply to  
you.  
In the event of a product defect during the warranty period, take the product and the RadioShack  
sales receipt as proof of purchase date to any RadioShack store. RadioShack will, at its option, un-  
less otherwise provided by law: (a) correct the defect by product repair without charge for parts and  
labor; (b) replace the product with one of the same or similar design; or (c) refund the purchase  
price. All replaced parts and products, and products on which a refund is made, become the prop-  
erty of RadioShack. New or reconditioned parts and products may be used in the performance of  
warranty service. Repaired or replaced parts and products are warranted for the remainder of the  
original warranty period. You will be charged for repair or replacement of the product made after the  
expiration of the warranty period.  
This warranty does not cover: (a) damage or failure caused by or attributable to acts of God, abuse,  
accident, misuse, improper or abnormal usage, failure to follow instructions, improper installation or  
maintenance, alteration, lightning or other incidence of excess voltage or current; (b) any repairs  
other than those provided by a RadioShack Authorized Service Facility; (c) consumables such as  
fuses or batteries; (d) cosmetic damage; (e) transportation, shipping or insurance costs; or (f) costs  
of product removal, installation, set-up service adjustment or reinstallation.  
This warranty gives you specific legal rights, and you may also have other rights which vary from  
state to state.  
RadioShack Customer Relations, 200 Taylor Street, 6th Floor, Fort Worth, TX 76102  
We Service What We Sell  
12/99  
32-2004  
04A00  
Printed in China  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
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