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10
Power Switch and Power Indicator
The power switch is located on the front panel of your amplifier. To turn the
unit on, push the switch in. The ring around the switch will light up and blink
three times, indicating that the amplifier is turned on. To turn the amplifier
off, push the button again and return it to the "out" position.
12V Trigger Input and Output
The jack labeled IN is for connecting the 3.5mm mono plug/cable carrying
a +12 volt trigger signal to turn the amplifier on and off. This input accepts
any control signal (AC or DC) ranging from 3 volts to 30 volts.
The jack labeled OUT is for connecting another 3.5mm mono plug/cable
to provide a 12 volt trigger signal to other components. Any 12V Trigger
signal at the INPUT jack will be passed through to the OUT jack.
NOTE: The maximum current for the trigger out is 10mA.
Protection Indicator
1
The amplifier has both thermal and over-current protection circuitry that
protects the amplifier against damage in the event of extreme or faulty
operating conditions. The protection circuits are independent of the audio
signal and have no impact on sonic performance. Instead, the protection
circuits monitor the temperature of the output devices and shut down the
amplifier if temperatures exceed safe limits.
Most likely, you will never see this protection circuitry in action. However,
should a faulty condition arise, the amplifier will stop playing. The power
indicator
1
on the front panel will blink. The LEDs above the ZONE 1 - 4
aslo will blink to indicate which zone caused the protection.
If this happens, turn the amplifier off. Let it cool down for several minutes,
and attempt to identify and correct the problem that caused the protection
circuitry to engage. When you turn the amplifier back on, the protection
circuit will automatically reset and the power indicator
LEDs above the ZONE 1 - 4 should light up, indicating that the amplifier
is turned on normal.
In most cases, the protection circuitry activates because of a fault condition
such as shorted speaker wires, or inadequate ventilation leading to an
overheating condition. In very rare cases, highly reactive or extremely low
impedance speaker loads could cause the protection circuit to engage.
If the protection circuitry triggers repeatedly and you are unable to isolate
and correct the faulty condition, contact your authorized Rotel dealer for
assistance in troubleshooting.
Signal Connections
See Figure 2
NOTE: To prevent loud noises that neither you nor your speakers will
appreciate, make sure the system is turned off when you make any
signal connections.
The unit provides standard RCA type input connections as found on nearly
all audio equipment.
In addition to the four groups of stereo inputs labeled ANALOG INPUT A
to D, there is also a pair of LINE OUT connections for passing the signal
connected to the unit to another audio component.
1
0
1
as well as the
C8 / C8+ Eight Channel Power Amplifiers
Analog Inputs
8
There are four Analog inputs for each of the four pairs of unit channels.
These Analog inputs accept audio signals from preamplifiers or surround
sound processors. Select high quality audio interconnect cables for best
performance.
For each pair of amplifier channels, connect the left channel output of your
preamp to the LEFT INPUT on the amplifier. Connect the right channel of
your preamp to the RIGHT INPUT. Make sure that the input A slide switch
to the upside of the analog inputs is in the STEREO position.
Mono Switch
8
For the channel INPUT A, when the input A slide switch is moved to the
MONO position, the left and right signals are combined and provided to
both speakers as a mono signal.
Line Output
7
This pair of Line level connections can be used to pass unprocessed input
signals to another audio component, for example to "daisy-chain" to another
amplifier to drive additional speakers. The input signals connected to the
INPUT A connectors is available on the Line Output connectors. This is
typically used when the unit is part of a multi-room system.
NOTE: It is recommended to Daisy Chain a maximum of 8 units.
NOTE: The MONO switch does not affect the Line Output.
Digital Inputs
6
For C8+ Only
There are two sets of digital inputs labeled DIGITAL INPUT A to D. Connect
the DIGITAL outputs of your source component into these sockets. The digital
signals will be decoded and played by the amplifier. The unit is capable of
decoding PCM signals up to 24 bit, 192kHz.
Speaker Outputs
See figure 2
The unit has four pairs of speaker connectors, one for each amplifier channel.
The eight speaker connectors may be used in many different configurations. The
Hook-up Illustration, Figure 2, shows just one example, with the connections
for a typical six-speaker system. Here, the remaining two channels are still
available to power up to two more speakers as required.
Speaker Selection
We recommend using loudspeakers with a nominal impedance of 4 ohms or
higher with the unit. You should not drive more than one pair of speakers for
each output channel. Driving more than one set of speakers from an output
may damage the unit. Speaker impedance ratings are less than precise. In
practice, very few loudspeakers will present any problems for the unit. See
your authorized Rotel dealer if you have any questions.
Speaker Wire Selection
Use insulated two-conductor stranded wire to connect the unit to the speakers.
The size and quality of the wire can have an audible effect on the performance
of the system. Standard speaker wire will work, but can result in lower
output or diminished bass response, particularly over longer distances. In
general, heavier wire will improve the sound. For best performance, you
may want to consider special high-quality speaker cables. Your authorized
Rotel dealer can help in the selection of cables for your system.
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