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M Series Power Amplifiers
Operation Manual
2.4 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. Depending upon which amplifier input you choose,
you should use either 3-pin male XLR connectors, TRS phone
connectors, or terminal forks at the amplifier inputs.
Unbalanced line may also be used but may result in noise over
long cable runs.
Note: Amplifier input connectors not used for audio signal input
may be used for daisy-chaining of the audio signal to other com-
ponents.
Figure 2.3 shows connector pin assignments for balanced wiring,
and Figure 2.4 shows connector pin assignments for unbalanced
wiring.
NOTE: Custom wiring should only be performed by
qualified personnel.
Figure 2.3
Balanced Input
Connector Wiring
Figure 2.4
Unbalanced Input
Connector Wiring
2 Setup
2.5 Choose Output Wire and Connectors
Crown recommends using pre-built or professionally wired, high-
quality, two- or four-conductor, heavy gauge speaker wire and
connectors. You may use two 4-pole Speakon
®
connectors (Fig-
ure 2.5 and Table 1) or banana plugs, spade lugs, or bare wire for
your output connectors (Figure 2.6). To prevent the possibility of
short-circuits, wrap or otherwise insulate exposed loudspeaker
cable connectors.
Note: Binding post outputs on European models come
with safety plugs installed to prevent European power-
cord plugs from being inserted. The top & bottom entry
positions for these connectors should therefore be used
with European models.
Using the guidelines below, select the appropriate size of wire
based on the distance from amplifier to speaker.
Distance Wire Size
up to 25 ft. 16 AWG
26-40 ft. 14 AWG
41-60 ft. 12 AWG
61-100 ft. 10 AWG
101-150 ft. 8 AWG
151-250 ft. 6 AWG
CAUTION: Never use shielded cable for output wiring.
Figure 2.6
5-Way Binding Post Connections
Figure 2.5
Left: Speakon
®
Output Connector on Back Panel
Right: Speakon
®
Cable Connector
Table 1 Speakon
®
Output Pin Assignments