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Speaker Connections
See Figures 2 & 3
The RB-976
has two pair of color coded
MkII
connections for each group of amplifier chan-
nels. Labels above the connectors show the
proper connections for connecting speakers
in Stereo mode. Labels below show the proper
connections for Bridged Mono mode.
These speaker connectors accept bare wire,
connector lugs, or "banana" type connectors
(except in the European Community countries
where their use is not permitted).
Route the wires from the RB-976
speakers. Give yourself enough slack so you
can move the components to allow access to
the speaker connectors.
If you are using banana plugs, connect them
to the wires and then plug into the backs of
the speaker connectors. The collars of the
speaker connectors should be screwed in all
the way (clockwise).
If you are using terminal lugs, connect them
to the wires. If you are attaching bare wires
directly to the speaker connectors, separate
the wire conductors and strip back the insu-
lation from the end of each conductor. Be careful
not to cut into the wire strands. Unscrew (turn
counterclockwise) the speaker connector col-
lar. Place the connector lug around the shaft,
or insert the bundled wire into the hole in the
shaft. Turn the collars clockwise to clamp the
connector lug or wire firmly in place.
: Be sure there are no loose wire strands
NOTE
that could touch adjacent wires or connec-
tors.
In Stereo mode: Connect the left speaker
to the pair of speaker connectors labeled LEFT.
Connect the right speaker to the speaker con-
nectors labeled RIGHT. Follow the labels printed
above the connectors, observe correct polar-
ity, and make sure the INPUT SELECT switch
for that pair of amplifier channels is set to the
STEREO position. (See Figure 2)
In Bridged Mono mode: Connect each
speaker to the POSITIVE terminals of the LEFT
and RIGHT speaker connections on the back
of the RB-976
. There are BRIDGED + and
MkII
– labels printed below each group of speaker
terminals to assist in maintaining proper po-
larity.
11
Connect the positive terminal of the speaker
to the speaker connector labeled LEFT + or
BRIDGED +. Connect the negative terminal of
the speaker to the speaker connector labeled
RIGHT + or BRIDGED –. Observe correct po-
larity, and make sure the INPUT SELECT switch
is set to the BRIDGED position. (See Figure 3)
Troubleshooting
Most difficulties in audio systems are the re-
sult of poor or wrong connections, or improper
control settings. If you encounter problems,
to the
isolate the area of the difficulty, check the control
MkII
settings, determine the cause of the fault and
make the necessary changes. If you are un-
able to get sound from the RB-976
to the suggestions for the following conditions:
Front Panel Power Indicator Is
Not Lit
No main power to the RB-976
power connections at the amplifier and the
AC outlet. Check the front panel power switch.
Make sure that it is set to the ON position. If
using signal sensing auto power-on, make sure
that a signal is present at the inputs. If using
12V trigger power-on, make sure that a trig-
ger signal is present at rear panel screw ter-
minals.
No Sound
If the amp is getting AC power, but is producing
no sound, check the PROTECTION INDICA-
TORS on the front panel. If lit, see below. If
not, check all of your connections and con-
trol settings on associated components. Make
sure that your input connections and speaker
connections match your selected stereo/mono
configuration.
Protection Indicator Is Lit
The front panel PROTECTION INDICATORS
light when the RB-976
have shut off the amplifier. Typically, this oc-
curs only when the ventilation openings are
blocked, when there is faulty speaker wiring,
or after a period of extreme use. Turn off the
system and wait for the amp to cool. Then push
the front panel power switch in and out to re-
set the protection devices. If the problem is not
corrected or reoccurs, there is a problem with
the system or the amplifier itself.
Specifications
Continuous Power Output Stereo Mode
(20-20 kHz, < 0.03% THD)
60 watts/ch into 8 ohms
Continuous Power Output Bridged Mono
Mode (20-20 kHz, < 0.1% THD)
150 watts/ch into 8 ohms
Total Harmonic Distortion
(20Hz-20kHz, 8 ohms)
< 0.03%
Intermodulation Distortion
(60 Hz : 7 kHz, 4:1)
< 0.03%
Frequency Response (±1 dB)
15Hz-100kHz
Damping Factor (20-20,000 Hz, 8 ohms)
150
Speaker Impedance (combined load)
, refer
MkII
Stereo mode: 4 ohms minimum
Bridged Mono mode: 8 ohms minimum
Signal to Noise Ratio (IHF A network)
116 dB
Input Impedance
22 k Ohms
. Check AC
MkII
Input Sensitivity
1.5 volt
Auto Turn On Threshold Level (if activated)
10 mV input signal
Auto Turn Off Delay Time (if activated)
5 minutes with no signal
Power Requirements
USA: 115 Volts, 60 Hz
Europe: 230 Volts, 50 Hz
Power Consumption
700 Watts
Dimensions (W x H x D)
440 x 121 x 410 mm
17
3/8
Weight (net)
12.7 kg, 28 lb.
All specifications are accurate at the time of printing.
Rotel reserves the right to make improvements
without notice.
protection circuits
MkII
English
x 4
x 16
in
3/4
1/8
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