McIntosh C30

HOW TO CONNECT
EXTERNAL SIGNAL PROCESSORS:
There are two sets of EXTERNAL PROCESSOR
jacks. One set is for the main listening circuits and
the other set is for the tape record circuits. These
jacks are used to connect to and from a noise reduc-
tion unit or to and from any other signal processing
device.
Be sure to match left to left and right to right chan-
nels when connecting external processors.
When connections are made to an EXTERNAL
PROCESSOR, the signal path is automatically
broken by the C 30 switching jacks. The SIGNAL
PROCESSOR MUST BE TURNED ON FOR THE PRO-
GRAM TO PASS THROUGH THE PREAMPLIFIER
CIRCUITS,
HOW TO CONNECT TO POWER AMPLIFIERS:
Connect a cable from the left C 30 MAIN OUTPUT
jack to the left power amplifier INPUT jack.
Connect a cable from the right MAIN OUTPUT jack
to the right power amplifier INPUT jack.
Two additional stereo power amplifiers may be
connected in the same fashion to the OUTPUT 1 and
OUTPUT 2 jacks. Audio output signal is supplied to
these jacks only when the front panel pushbutton
SPEAKER/OUTPUT No. 1 and/or No. 2 pushbuttons
are pressed. This arrangement is useful for large
systems where separate amplifiers and
loudspeakers are used at remote locations.
Additional amplifiers can serve remote areas such
as selected living areas, workshop or outdoor
recreational facilities. Other devices can be controll-
ed such as a rear channel reverberation unit.
SPEAKER CONTROL RELAY
(an optional accessory)
The SPEAKER CONTROL RELAY, or SCR, is
designed to provide both speaker control switching
and high power switched AC outlets. To control
loudspeakers, SPEAKERS 1 and 2 pushbuttons on
the front panel must be used. When this is done,
OUTPUT jacks 1 and 2 on the C 30 are normally not
used. The operation of output jacks and speaker
control will otherwise interfere with each other.
Plug the cable from the SCR into the C 30 back
panel SPEAKER CONTROL RELAY receptacle. Con-
nect the power amplifier output to the FROM
POWER AMPLIFIER terminals on the SCR. Observe
correct channel identification as well as correct
polarity. The MAIN speakers (controlled by
SPEAKER 1 pushbutton) are connected at the TO
MAIN SPEAKER terminals. The REMOTE speakers
(controlled by SPEAKER 2 pushbutton) are con-
nected at the TO REMOTE SPEAKERS terminals.
Again, observe correct channel identification and
polarity.
SPEAKER 1 AND 2 USING THE SCR:
When pushbutton 1 is IN and pushbutton 2 is OUT,
the main speakers will be connected to the power
amplifier via the relays in the SCR. When pushbutton
1 is OUT and pushbutton 2 is IN, the remote
speakers will be connected instead. When both
pushbuttons 1 and 2 are IN, both sets of speakers
will be connected.
CAUTION: When both sets of speakers are con-
nected at the same time, their combined parallel im-
pedance must not be too low to properly match the
power amplifier output impedance. For example: if
both sets of speakers are 8 ohms, connections to
the power amplifier must be to the 4 ohm tap. If the
amplifier does not have different impedance taps, it
must be able to deliver power to a 4 ohm load as well
as an 8 ohm load.
The SCR also has two AC power outlets that pro-
vide additional capacity of 2400 watts switched by
the C 30. Use these outlets to supply AC power to
amplifiers or other components whenever the total
load to be switched by the C 30 exceeds the rating of
1200 watts. Plug the SCR heavy line cord directly in-
to a wall outlet. When the C 30 is turned on, power
from the C 30 will energize a relay in the SCR which
connects the two SCR AC outlets directly to the wall
outlet. Do not plug the C 30 power cord into the SCR
as the preamplifier cannot function when so con-
nected.
HOW TO CONNECT AC POWER:
Plug the preamplifier AC power cord into a 120
volt 60Hz wall outlet. A polarized attachment plug is
used. Be certain that the plug blades can be fully in-
serted in the outlet to prevent blade exposure. See
the caution notice on page 1.
Three types of AC power outlets are provided on
the back panel of the C 30. Six are black, one is red
and one is green.
The black outlets are switched on and off when
the C 30 is turned on and off. These are intended for
power amplifiers, CD players, equalizers and other
accessories totaling up to 1200 watts capacity.
The red outlet is on at all times. For example, a
VCR can be plugged into this outlet for recording a
TV program when the main system is not turned on.
The green AC power outlet is on at all times and is
for use only with a turntable. Do not use this outlet
for any other purpose. The turntable can be used as
a power switch as described in the following sec-
tion.
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