Operating Features; A Few Precautions; Placement; Ac Power And Control - Rotel RB-951 mkII Owner's Manual

Operating Features

• Two-channel Stereo or Bridged Mono op-
eration (back panel switchable)
• Optional Parallel Mono operation for driv-
ing low impedance multi-speaker loads in
custom installation applications (requires
resetting internal jumpers).
• User-selectable power on/off configuration:
manual, automatic signal sensing, or con-
trolled by remote 12 volt trigger signal.
• Front panel input level controls
• Protection circuitry with front panel indi-
cators
• Front panel clipping indicators

A Few Precautions

Please read this manual carefully. In addition
to basic installation and operating instructions,
it provides valuable information on various
RB-951 system configurations as well as
MkII
general information that will help you get op-
timum performance from your system. Please
contact your authorized Rotel dealer for an-
swers to any questions you might have. In ad-
dition, all of us at Rotel welcome your ques-
tions and comments.
Save the RB-951 shipping carton and all
MkII
enclosed packing material for future use. Ship-
ping or moving the RB-951
MkII
than the original packing material may result
in severe damage to your amplifier.
Be sure to keep the original sales receipt. It is
your best record of the date of purchase, which
you will need in the event warranty service is
ever required.

Placement

The RB-951 generates heat as part of its
MkII
normal operation. The heat sinks and ventila-
tion openings in the amplifier are designed
to dissipate this heat. The ventilation slots in
the top cover must be unobstructed. There
should be 10 cm (4 inches) of clearance around
the chassis, and reasonable airflow through
the installation location, to prevent the ampli-
fier from overheating.
Likewise, remember the weight of the ampli-
fier when you select an installation location.
Make sure that the shelf or cabinet can sup-
port its considerable bulk. Again, use common
sense.
9

AC Power and Control

AC Power Input

The RB-951
power chord. Use only this cord or an exact
equivalent. Do not use an extension cord. A
heavy duty multi-tap power outlet strip may
be used, but only if it is rated to handle the
current demanded by the RB-951
Be sure the power switch on the front panel
of the RB-951
end of the cord into the AC power connector
on the back panel of the amplifier. Plug the
other end into an appropriate AC outlet.
Your RB-951
for the proper AC line voltage in the country
where you purchased it (USA: 115 volts/60
Hz , Europe: 230 volts/50 Hz). The AC line
configuration is noted on a label on the back
panel.
: Should you move your RB-951
NOTE
another country, it is possible to configure your
amplifier for use on a different line voltage.
Do not attempt to perform this conversion your-
self. Opening the enclosure of the RB-951
exposes you to dangerous voltages. Consult
a qualified technician or the Rotel factory ser-
vice department for information.
in anything other If you are going to be away from home for
an extended period of time, it is a sensible
precaution to unplug your amplifier.

Power Switch and Indicator

The power switch is located on the left side
of the front panel. To turn the amplifier on (or
to activate either of the optional automatic
power-on modes), push the switch in. The LED
indicator above the switch will light, indicat-
ing that the amplifier is turned on. To turn the
amplifier off, push the button again and re-
turn it to the out position.
Auto Turn On/Off Mode
Selector
The RB-951
for manual or automatic power on/off opera-
tion. These modes are selectable using a three-
position slide switch on the back panel as
follows:
is supplied with the proper AC
MkII
.
MkII
is turned off. Then, plug one
MkII
is configured at the factory
MkII
MkII
provides three different options
MkII
• With the switch in the OFF position,
the amplifier is turned on or off manually
using the front panel power switch. Also
use this mode if you are using a switched
AC outlet to control power to the ampli-
fier.
• With the switch in the SIGNAL SENS-
ING position, the amplifier turns on au-
tomatically when a signal is sensed at the
inputs. The amplifier will go into standby
mode five minutes after no signal is present.
The front panel power switch overrides this
function. It must be ON for the signal sensing
to work. Turning the switch OFF cuts power
to the amplifier, regardless of whether or
not a signal is present.
• With the switch in the +12V TRIG.
IN position, the amplifier is turned on
automatically when a 12 volt trigger sig-
nal is present at the screw terminals adja-
cent to the left of the switch. The amplifier
will go into standby mode if the +12 volt
signal is not present. The front panel
to
POWER SWITCH overrides this function.
It must be ON for the +12V trigger to work.
Turning the switch OFF cuts power to the
amplifier, regardless of whether or not a
MkII
trigger signal is present.

12V Trigger Input

A pair of screw terminals for connecting the
wires carrying a +12 volt trigger signal to turn
the amplifier on and off, such as might be used
in an elaborate custom installation. To use this
feature the adjacent slide switch must be placed
to the left position (see previous section).
The TRIGGER INPUT accepts any control sig-
nal (AC or DC) ranging from 3 volts to 30 volts.
The screw terminals are labeled "+ and –"
Observe proper polarity when connecting the
trigger signal wiring.

Circuit Breaker

A circuit breaker on the rear panel protects
the amplifier's electrical circuity. Generally, the
circuit breaker will only open under a fault
condition which results in excessive current
draw. To reset the circuit breaker, press the
button. Should it repeatedly open, contact your
authorized Rotel dealer for troubleshooting
assistance.
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