Installation – JBL MPA275 User Manual
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Installation
Figure 4. Neutrik Speakon Connector Wiring for Speaker Outputs
Exploded view (side)
Connection Terminals
Inputs
Balanced input connections are available via barrier strip or XLR connectors. The unit
is shipped with pin 2 high (see subsequent instructions to change polarity). As usual,
for unbalanced inputs, the unused terminal should be terminated to ground (the
negative input terminals on the barrier strip are located adjacent to the ground termi-
nal for this purpose).
Input sensitivity is 1 Vrms, and impedance is 20 kilohm balanced, 10 kilohm
unbalanced, as is typical of JBL amplifiers.
The input jacks are located on a removable panel which has a toggle switch for
(1) bridged-mono (2) normal stereo, or (3) paralleling the inputs. See page 2 for more
information about the Open Input Architecture slots.
Outputs
Speaker connections are made via standard red/black 5-way binding posts, or by
Neutrik NL4FC Speakon connectors. The Speakon for each channel uses the standard
wiring of:
Pin 1-
=
Speaker Ground
Pin 1+
=
Speaker Hot
Pin 2-
=
[Not used]
Pin 2+
=
[Not used]
In addition, a central Speakon is provided with the standard stereo wiring of:
Pin 1-
=
Ch 1 Ground
Pin 1+
=
Ch 1 Hot
Pin 2-
=
Ch 2 Ground
Pin 2+
=
Ch 2 Hot
2–
2+
1+
1–
NEUTRIK
SPEAKON
NL4FC
SWISS MADE