Radio Shack MPA-125 Stereo Amplifier User Manual


 
6
Connections
Notes:
If your microphone’s cord is longer than 20 feet (6.01 meters), we recommend that you
connect it to a balanced jack to reduce signal hum.
If you connect a microphone to both jacks for
MIC 1
,
MIC 2
,
MIC 3
, or
MIC 4
, the microphone
you connect to the unbalanced jack has priority.
If you connect a microphone to either
MIC 4
jack, set
PHONO/MIC 4
on the back of the
amplifier to
MIC 4
.
Connecting a Turntable
You can connect a low-level audio input source (such as a magnetic cartridge turntable) to the
L PHONO
and
R PHONO
jacks on the back of the amplifier.
If you connect a low-level audio input source to the
PHONO
jacks, set
PHONO/MIC 4
on the back
of the amplifier to
PHONO
.
To avoid a low-frequency hum, connect your turntable’s ground wire (usually black or green) to
the amplifier’s
GND
terminal.
Turntable
GND
PHONE/MIC 4
32-2003.fm Page 6 Tuesday, March 28, 2000 10:45 AM