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When using the PS 1230 power supply with either amplifier, connect one end of the
DC power cord to one of the two pole, 3.5 mm captive screw connectors on the
power supply. Connect the other end into the power socket on the rear panel of the
amplifier, as shown in figure 4 below. The power cord connectors are already correctly
wired when shipped.
CAUTION: When the PS 1230 power supply is connected to the MPA 401, it
must not be shared with any other devices.
Power Receptacle
DC Power Cord
Captive Screw Connector
POWER
12V
1.5 A MAX
MPA 401 series
Amplifier
DC Power
Outputs
AC Power Cord
Tie
Wrap
Captive Screw
Connector
Power Supply
Output Cord
PS 1230 Power Supply
Figure 4. Connecting the PS 1230 Power Supply to an MPA 401 Amplier
Audio Inputs
Use the rear panel connections (see figure at right) to
connect audio inputs to the amplifier. Wire the connectors
as shown below. The balloon numbers refer to figure 2.
b RCA input connectors — These connectors accept
unbalanced, line level audio signals. The input can be stereo
(using two RCA jacks) or mono (using a single RCA jack
plugged into the left/mono socket).
If unused, the connectors automatically terminate to lower the
noise floor.
c 3.5 mm stereo input — This input also accepts unbalanced,
line level audio signals through a 3.5 mm tip ring sleeve (TRS)
stereo jack. If unused, the connector automatically terminates
to lower the noise floor.
d Balanced or unbalanced audio
input connector — This 5-pole
3.5 mm captive screw connector
accepts line level, balanced or
unbalanced, mono or stereo audio
signals. See the notes on page 4
for important information about
connecting wires to captive screw
connectors.
INPUTS
L (MONO)
(MONO)
R
R
L
b
cd
Tip
Sleeve
Ring
Balanced Mono Input
Tip
Sleeve
Unbalanced Mono Input
Tip
Ring
Sleeve (s)
Tip
Ring
L (MONO) R
Tip
Sleeve
Tip
Sleeve
Unbalanced Stereo Input
(high impedance)
Balanced Stereo Input
(high impedance)
L (MONO) R L (MONO) R
L (MONO) R
Tip (+)
Sleeve ( )
RCA Connector
Sleeve ( )
Ring (R)
Tip (L)
3.5 mm TRS Connector
MPA 401-70V and MPA 401-100V • Rear Panel and Cabling 5