6
– CXA120
CXA120 –
7
13. OUTPUT TERMINALS
This terminal is normally covered by a protective cover.
Remove the two screws and the cover while making or
undoing connections. Securely refit the cover when you
have finished making the connections.
The five output terminals are labeled COM, 4
Ω
, 25 V, 70 V
and 100 V.
CONSTANT IMPEDANCE
To connect a speaker directly,
connect the COM terminal
to the negative post of your
speaker, and connect the 4
Ω
terminal to the positive post.
Make sure that your
average speaker impedance
is not less than 4
Ω
, as this may
overload the amplifier.
The speaker output connectors are screw terminals. Use
16 or 18 gauge wire for connecting the amplifier outputs to
the speakers. Strip the wire back about 3/8" inch, loosen
the screw enough to loop the wire around the shaft of
the screw (clockwise), and tighten down the screw with a
screwdriver.
CONSTANT VOLTAGE
If you are using a constant-voltage distributed speaker
system, connect either the 25 V, 70 V, or 100 V output
terminal to the "+" side of the speaker system, and connect
the "COM" output terminal to the "–" side of the speaker
system.
The voltage of your speakers must equal the voltage of
the amplifier's output terminal ( 25 V, 70 V, or 100 V).
Make sure that the taps on the speakers add up to no
more than 90% rated power (108 W for the CXA120).
CAUTION:
To prevent the risk of electric shock,
never touch the bare wires coming from the OUTPUT
TERMINALS of the amplifier when it is switched on.
When the connections have been made, insulate the
25 V, 70 V, and 100 V terminals of the amplifier using
the protective cover supplied.
COM and 25V are used to connect a string of 25V speakers.
Use Class II or Class I wiring:
COM and 70V are used to connect 70V speakers.
Use Class I wiring:
COM and 100V are used to connect 100V speakers
Use Class I wiring:
+
100V
70V
25V
4
COM
DC 24V
-
-
+
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COM
DC 24V
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