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SHOWMATCH SYSTEM REFERENCE GUIDE
System Testing
Periodic testing of the ShowMatch system components is required to assure that the system will deliver the desired
performance during operation. While the system is designed to provide a high level of reliability, it is recommended that
ShowMatch array modules and subwoofers be tested periodically to verify that all components are operational.
A recommended periodic check is to measure the DC resistance of the loudspeakers using a digital multimeter. This
test, when performed on individual modules, will provide an accurate reading of whether the devices are properly wired
and operating within their operating tolerances. Note that these measurements only validate
the electrical performance of the drivers and not the mechanical performance. For information
related to performing mechanical tests, e.g. rub and buzz, consult the ShowMatch DeltaQ Array
Loudspeakers service manual.
Measurement Set Up
Test the ShowMatch module prior to operation and at room temperature using a digital
multimeter. To test the LF section place the probes across the 1 +/- pins; to test the HF place the
probes across the 2 +/- pins. Note that it may be necessary to make a breakout cable comprised
of an NL-4 to either banana or pig-tail with the connections labeled appropriately.
Wiring
1+
All Drivers Functioning
SM8
left
SM8
right
1 x LF Driver Open
1+
16
16
1 -
2 x LF Driver Open
2+
2-
Any Driver Shorted
1-
1+
2+
EMB2S
SM8
EMB2S
left
SM8
right
1+
1+
}
}
16
16
1 -
12
1 -
Wiring
12
2+
2+
2-
2-
All Drivers Functioning
1-
EMB2S
EMB2S
2-
2+
1 x HF Driver Open
EMB2S
EMB2S
2 x HF Driver Open
1+
}
}
12
1 -
12
2+
3 x HF Driver Open
2-
EMB2S
EMB2S
4 x HF Driver Open
2-
Any Driver Shorted
Wiring
SM8
right
Functioning Woofer
1+
16
1 -
2+
2-
EMB2S
1+
1+
}
Grille-
12
1 -
1 -
mounted
2+
2+
NL4MP
Connector
2-
2-
EMB2S
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ShowMatch Full Range Modules (SM5, 10, 20)
LF Section (1 +/-)
Condition
DC Resistance (Ohms)
5.1
10.2
INF
0
HF Section (2 +/-)
1+
Grille-
1 -
mounted
Condition
DC Resistance (Ohms)
NL4MP
2+
Connector
2-
7.2
14.4
INF or 14.4
1+
Grille-
1 -
mounted
NL4MP
2+
INF
Connector
2-
INF
0
ShowMatch SMS118 Subwoofers
SMS 118 LF Driver (1 +/-)
Condition
DC Resistance (Ohms)
3.3
Open
INF
Short
0
ShowMatch Loudspeakers Technical Specifications
NL4 to banana
breakout test cable
Tolerance
0.5
0.9
--
--
Tolerance
Tolerance
0.4
--
--
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