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MPA 401-70V • Setup and Operation
3-2
Setup and Operation
Front Panel Features
The illustration below shows the front panel of the MPA 401-70V.
BASSLEVEL TREBLE
MINI POWER AMPLIFIER
MPA 401
1
2
a
Power LED — The green LED is on when the MPA 401 unit is receiving power.
b
Potentiometers — These three front panel potentiometers are used to optimize
level, bass, and treble settings. For further details, see below.
Setting Input Level
Adjust the MPA 401-70V input level as follows:
1.
If necessary, unplug the remote plug from the
unit.
2.
If connecting the amplifier to a system
with adjustable volume, set the volume
to its lowest point. Then adjust the MPA 401-70V level potentiometer fully
counterclockwise to its minimum setting.
3.
Set the system volume to its maximum level. No sound should come out.
4. Slowly increase the MPA 401-70V level until sound distortion starts to occur.
Lower the level slightly until the distortion disappears. This setting ensures
that, whatever the system volume setting may be, no clipping occurs.
Setting Bass and Treble
Adjust the MPA 401-70V bass and treble as follows:
1.
Use the bass potentiometer to increase or decrease the bass shelving ±10 dB at
100 Hz and below.
2.
Use the treble potentiometer to increase or decrease the treble shelving ±10 dB
at 10 kHz and above.
N
Turning the bass or treble potentiometers counter clockwise will decrease the
output at the specified frequencies. Turning the potentiometers clockwise will
increase the output. When the potentiometer is at the center detent, flat response
is achieved.
BASSLEVEL TREBLE
MINI POWER AMPLIFIER
MPA 401