Commercial Audio Series
Mixer-Amplifiers
page 9
Operation Manual
2.3 Choose Input Wire and Connectors
Crown recommends using pre-built or professionally wired bal-
anced line (two-conductor plus shield), 22-24 gauge cables and
connectors. Unbalanced line may also be used but may result in
noise over long cable runs.
The 140MPA has two types of input connectors: Phoenix-type
and RCA.
• Mic/Line Connectors and Amp Input Connectors
: 3-pin
Phoenix-type, balanced, one per input channel (Figure 2.3).
• Dual RCA Input Connector:
For stereo music signals,
unbalanced, summed together, two connectors per input (Figure
2.4).
• Transformer-isolated 600-ohm input:
3-pin Phoenix-
type.
Summed into Input 1 for paging from a telephone system.
See Figure 2.5.
2 Setup
Figure 2.3 Mic/Line Connectors
and Amp Input Connectors
MIC
+
–
+
–
To mic o
r
li
n
e-level
s
o
ur
ce
To
s
te
r
eo
li
n
e-level
s
o
ur
ce
Figure 2.4 Dual RCA Input Connectors
Figure 2.5 Tel (Isolated)
Connector Wiring
from Telephone System
Interface or PBX
-
To telepho
n
e
s
y
s
tem
i
n
te
r
face/PBX o
u
tp
u
t
Summary of Contents for 140MPA
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