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Wiring Information
Outputs For PM-3180 Amplifier
Each amplifier channel has its own output terminal strip on the rear panel.
Each terminal strip can handle a different type of speaker load. All amps
can handle 70V & 25V distrib-
uted or 8-Ω or 4-Ω loads. The
70V, 25V and 8-Ω outputs are
transformer-coupled. The 4-Ω
output is directly connected to
the amplifier output. The 4-Ω
output provides a wider fre-
quency response with better
bass reproduction and lower
distortion.
To connect an 8-Ω, 25V or 70
load, attach one lead to the
COM terminal and the other to
the terminal corresponding to
the output desired. Ensure
that the shorting clip connects
COM and GND and that the
shorting clip for the LINK is
installed.
The transformer-coupled out-
puts (70V, 25V, 8-Ω) can be
made to float by disconnecting
the shorting clip between GND
and COM. This may be desir-
able in certain situations where
a balanced output is needed.
In general, it is best to keep the
shorting clip installed between
GND and COM.
To connect a 4-Ω load, first
remove the shorting clip
between the two screw termi-
nals marked LINK. Connect
one lead of the 4-Ω load to the
4-Ω terminal and the other lead
to the GND terminal.
8-Ω Load
25V or 70V
Load
4-Ω Load
16