Specifications

Operation Manual
Studio Reference I & II Professional Studio Amplifiers
page 8
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. Use either 3-pin male XLR connectors orTRS phone
plugs at the amplifier inputs.
Unbalanced lines may also be used but may result in noise over
long cable runs.
Connector pin assignments and wiring are shown in thes
Figures:
Figure 2.4: Unbalanced XLR
Figure 2.5: Balanced XLR
Figure 2.6: Balanced and unbalanced phone plugs.
NOTE: Custom wiring should only be performed by
qualified personnel.
2 Setup
2.5 Choose Output Wire and Connectors
Crown recommends using pre-built or professionally wired, high-
quality, two-conductor, heavy gauge speaker wire and connectors.
You may use banana plugs, spade lugs, or bare wire for your out-
put connectors (Figure 2.7). 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 2.4 Unbalanced Input Wiring
Figure 2.5 Balanced Input Wiring
Figure 2.6 Balanced and Unbalanced Phone Plugs
Figure 2.7
Output Connector
Wiring
Note: Each output channel has two sets of
binding posts (not shown here) to make it
easier to connect multiple loudspeaker
cables to each channel.