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Audio Inputs
Use the rear panel receptacles (see figure at right)
to connect audio sources to the amplifier. Wire the
connectors as shown below. The balloon numbers refer
to the figure to the right.
NOTE: Thegroundpinsoftheinputreceptacles
maybelabeled or (seetheimagestothe
right).Thewiringandfunctionarethesame
whicheverwaytheproductislabeled.
b RCA input receptacles — These receptacles accept
unbalanced, line level audio signals. The input can be stereo,
using two RCA connectors, or mono, using a single RCA
connector plugged into the left (Summed) receptacle.
If unused, the receptacles automatically terminate to lower the
noise floor.
c 3.5 mm TRS stereo input receptacle — This input also
accepts unbalanced, line level audio signals through a
3.5mm tip ring sleeve (TRS) stereo connector. If unused, the
receptacle automatically terminates to lower the noise floor.
d Balanced or unbalanced input
receptacle — This 5-pole 3.5 mm
captive screw receptacle accepts
line level, balanced or unbalanced,
mono or stereo audio signals (see
the attention and the note on
page6 for important information
about connecting wires to captive
screw connectors).
Tip (+)
Sleeve ( )
RCA Connector
Sleeve ( )
Ring (R)
Tip (L)
3.5 mm TRS Connector
Balanced Stereo Input
Tip
Ring
Tip
Ring
Sleeves
LR
Unbalanced Stereo Input
Tip
Sleeve
Sleeve
Tip
LR
Balanced Mono Input
Tip
Ring
Sleeve
LR
Unbalanced Mono Input
Tip
Sleeve
LR
INPUTS
L
(MONO)
L
(MONO)
R
R
L
(SUMMED)
(SUMMED)
R
R
L
INPUTS
2
3
3 4
4
2
MPA 401-70V and MPA 401-100V • Rear Panel and Cabling 6