BALANCED jacks are present whenever the C39 Area "A" is on and operating, and are the
same signals as at the Unbalanced Left Front and Right Front Outputs.
Using balanced connectors and cables can reduce noise and interference by as much
as 40dB. This extra noise reduction can be a significant improvement, especially if the cables
are quite long.
If two separate mono power amplifiers are used with the C39 to reproduce the Left
and Right Front signals, balanced cables can eliminate the possibility of hum pickup.
If cable lengths between the C39 and the power amplifiers are one meter or less, you may
find high quality unbalanced cables to be satisfactory.
Balanced Jack Pin Configuration:
Pin 1. System Ground
Pin 2. + Output
Pin 3. - Output
19. ANT/CABLE, TV and MODULATOR
ANT/CABLE: Connect a coaxial cable from a TV Antenna or Cable Output to the ANT/CABLE
Coaxial connector.
TV: Connect a coaxial cable from the C39 TV coaxial output to the coaxial antenna input
of a TV receiver being used as a monitor. Whenever the C39 is turned OFF, the RF signals
feed from the ANT/CABLE connector directly to the TV connector for normal TV reception.
When the C39 is turned on, and any of the VIDEO signal sources are selected, the RF
signal from the ANT/CABLE is turned off and the TV will receive audio/video signals selected
by the C39. The C39 MODULATOR feeds only mono audio signals to the TV
CHANNEL 3 - 4: Set this switch to select which channel on the TV you would like to receive
the audio/video signals.
INPUT A-B: Switch to position "A" for audio/video signals selected by the front panel LISTEN
"A" selector switch, or to position "B" for audio/video signals selected by the RECORD "B"
switch. In order to receive audio/video signals selected by the RECORD "B" switch, Area "B"
must first be turned ON in Area "B". When Area "B" is turned off, the RF signals from the
ANT/CABLE pass on through to the TV set when the INPUT A-B switch is in the "B" position.
TV AUDIO: Adjust the TV AUDIO volume control for the desired audio level from the TV.
20. AC OUTLETS (Total of Three)
The SWITCHED AC outlet turns on whenever the C39 is turned on in either Area "A" or
Area "B", and can be used to power any audio or video accessory used in the system.
AREA "A" PWR AMP outlet supplies AC to the power amplifier connected for use in the
Main, or Area "A", whenever the C39 is turned on.
AREA "B" PWR AMP supplies AC to the power amplifier connected to the Area "B" Outputs.
The Area "B" Outputs and dedicated power amplifier can only be turned on by the
C39 Remote Controller or WK-1 keypad in Area "B".
To expand the number and current capability of any of the three AC outlets, a power con-
trol relay such as the Mcintosh R612 or PC-2 can be used.
TOTAL CURRENT CAPACITY OF ALL C39 REAR PANEL AC OUTLETS IS 1400 WATTS
21. POWER CONTROL
This connector supplies a 5 volt DC Logic 1 control signal to feed to a Power Control Input
on a Mcintosh MC7106 Power Amplifier or other compatible accessory to turn its AC power
on and off.
18
THE
REAR PANEL
AND
HOW TO MAKE
CONNECTIONS
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