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Rear Panel
4. Bus Inputs
RCA connectors and a screw terminal strip are
provided to connect your mixer, stereo tuner/preamp,
CD player or other audio media device.
Note: use only one type of source.
5. Bus Outputs
These RCA connectors are simply
in parallel with the Bus Inputs and
enable you to interconnect the CA12
with another CA12 or amplifier.
Note: only the Input Bus signals
will be patched to Output.
The Following Applies to Each
One of the Zone Input Sections
6. Ch Line Input
These inputs allow connection of
sources directly to the individual
channels. This input allows stereo,
line-level source or two separate
mono audio sources. If you Bridge the Zone's pair
of amplifiers into an 8-ohm speaker circuit, use the
Left input and connect a mono source.
7. Line/Bus Button
Each Zone's input source can be selected using
this switch. Depress the button to select
the audio program coming from the Bus
Input or leave it in the up position to use
the Zone's Line Input.
8. Remote Volume Jack
Using a cable terminated with a
¼-inch mono phone plug, connect
your DC remote volume control
source (a potentiometer for example)
here. When connected, this feature
bypasses both front panel
controls for this Zone.
Note: Use a 50,000
10
ohm B taper
potentiometer.
Connect the wiper
of the potentiometer to the tip of the
stereo phone plug. Connect the ring
of the stereo phone plug to the top of
the potentiometer resistive element, and
connect the bottom of the potentiometer
resistive element to the sleeve of the
stereo phone plug. The tip, ring, and sleeve
electrical circuits must remain isolated from
any other ground or electrical connection.
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All manuals and user guides at all-guides.com
9. Limiter In/Out Button
The Limiter In/Out button activates a pre-set
input limiter, which helps reduce the level
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connecting a 70V speaker circuit while in Bridge
mode as the output will be at 140V and the sound
can be distorted.
11. +4 ohm / 70V Button
Leave this switch in the up position if you are
connecting 4-ohm or 8-ohm speaker circuit
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(Stereo mode). Depress the button to connect a
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C O L I S E U M
of accidental loud noises and clipping
distortion for each Zone (both channels
of each Zone).
10. Stereo/Bridge Button
For stereo, or dual-zone mono
operation, at 50 Watts per channel
leave this in the up position. To
combine (i.e. Bridge) the two into a
110-Watt mono amplifier, depress
the button. In Bridge mode, the +4
ohm / +70V button must be in the
+4 ohm position (depressed) to
allow for the 8-ohm speaker circuit,
not 4-ohms! In bridge mode, an
amplifier encounters a load that is
about one half of its actual value
– a 4-ohm load would therefore be
2-ohms to a bridged amp and if
the amplifier isn't designed to run
safely into such a low impedance
(which the CA12 is not) damage may occur
to the amplifier. We do not recommend
70V speaker circuit.
12. Speaker Connections
Insert bare wire ends here and
tighten the retaining screws to secure
properly. For a stereo Zone or dual
mono Zones, connect the + and –
system leads from each Zone to
one +4 ohm and its adjacent – Neg
terminal in the L & R terminal
groupings. In Bridge mode,
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connect the + and – leads
from an 8-ohm speaker circuit
(not 4-ohms – see Stereo/
Bridge Button section above) to each
of the +4 ohm terminals.
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