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8

Using Your Amplifier

ˆ

Using Your Amplifier

1. Start the input sound source.

2. Make sure 

LEFT

 and 

RIGHT

 on the front

of the amplifier are set to 

MIN

.

3. Press 

POWER

 to turn on the amplifier.

4. One at a time, adjust 

LEFT

 and

 RIGHT

 to

the desired volume level.

Turn 

LEFT

 and 

RIGHT

 clockwise to

increase or counterclockwise to
decrease the corresponding left and
right output power. To get the best per-
formance with the least sound distortion,
always adjust 

LEFT

 and 

RIGHT

 so the

meter’s pointer does not continuously
swing to the extreme right. 

5. When you finish, press 

POWER 

to turn

off the amplifier.

USING THE METERS/METER 
RANGE

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.

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.

If the meter’s needle continuously swings to
the extreme right, press 

METER RANGE 

to

the out position to maintain a 0 dB gain for
the meter. Or, press 

METER RANGE

 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-

nal exceeds the output power level you set
using 

LEFT

 and 

RIGHT

, warning you of possi-

ble damage to the amplifier. If this happens,
reduce the output level of the connected
sound source or 

LEFT

 and 

RIGHT

 until the in-

dicator flickers only at peak volume levels.

USING SPEAKER A/B

Press in 

SPEAKER A

 or 

SPEAKER B

 on the

front of the amplifier for the channel you want
to listen to. Or, press in 

SPEAKER A

 and

SPEAKER B

 to listen to all connected speak-

ers.

Caution: If you connected 4 ohm speakers
to the amplifier, to avoid damage do not set
both 

SPEAKER A

 and 

SPEAKER B

 to the in

position.

MONITORING THE SOUND 
SOURCES

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)

plug into the 

PHONES

 jack on the front of the

amplifier. Using headphones lets you easily
check and adjust the sound source’s bal-
ance.

Note: Your local RadioShack store carries a
wide selection of headphones.

Summary of Contents for 04A00

Page 1: ...Owner s Manual Please read before using this equipment 250 Watt Stereo PA Amplifier...

Page 2: ...e 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 Mete...

Page 3: ...idging Capability you can combine the amplifier s two channels and use the amplifi er with only one channel producing a total of 350 watts Meter Range Select Switch lets you con trol the meter s sensi...

Page 4: ...helf 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...

Page 5: ...m plifier to this amplifier Cautions 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 Before you m...

Page 6: ...ity 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 Preparing the Speaker Wires Use the shortest leng...

Page 7: ...other end of the speaker s positive and negative wires to the amplifier s red SPEAKERS LEFT and SPEAKERS RIGHT terminals as shown here Note SPEAKERS RIGHT on the amplfier is used as a negative termi n...

Page 8: ...to the extreme right press METER RANGE to the out position to maintain a 0 dB gain for the meter Or press METER RANGE to the in position to allow a 20 dB gain CLIP INDICATOR The CLIP indicator on the...

Page 9: ...lly to keep it looking new Modifying or tampering with the PA Amplifi er s internal components can cause a mal function and might invalidate its warranty If your PA Amplifier is not performing as it s...

Page 10: ...en 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 th...

Page 11: ...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 Speaker Impedance A B 4 16 ohms A B 8 16 ohms Bridged 8 16 ohm...

Page 12: ...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...

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