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SF228TSpeakerSystem•Installation 6
1. Flip the terminal cover plate so the transformer side is up.
Black (-)
To Second
Speaker
Red (+)
Red (+)
Black (-)
From Amplifier
(70V/100V)
NC
2 W
4 W8 W
16 W
32 WCOM
70 V
100 V
COM NC 32 W
16 W
8 W 4 W 2 W
(Red) To Speaker , Terminal
(Black) To Speaker . Terminal
Cable Access Opening
Transformer
Terminal Block
Tap Label
Transformer
Figure 6. Terminal Cover With Transformer Side Exposed
a. Route the two wires from the amplifier through the cable access opening to the
transformer terminal block. If conduit is used, pull the wires coming from the
amplifier through and out of the conduit.
b. Strip 3/16 inch (5 mm) from the wire ends and keep the wire end strands together
by twisting them. Do not tin the wires.
c. Secure the wires to the appropriate taps on the captive screw connectors of the
seven-connector transformer terminal block as indicated on the tap label.
When wiring to a single speaker, the black negative (–) wire attaches to the “COM”
terminal, and the red positive (+) wire attaches to the desired terminal tap.
NOTE: Pay close attention to the polarity of the wires. Do not mix negative
and positive wires.
NC
2 W
4 W8 W32 WCOM
70 V
100 V
COM NC 32 W
16 W
8 W 4 W 2 W
16 W
Red Wire
Black Wire
From Amplifier (+)
From Amplifier (−)
Figure 7. Secure Wiring to Terminal Block
d. Use a small flat blade screwdriver to tighten the terminal block screws.