ROTEL RKB-650 - Manual (Page 14)

14 RKB-650 Six Channel Power Amplifier
Troubleshooting
Most difficulties in audio systems are the result
of poor or wrong connections, or improper
control settings. If you encounter problems,
isolate the area of the difficulty, check the
control settings, determine the cause of the
fault and make the necessary changes. If you
are unable to get sound from the RKB-650,
refer to the suggestions for the following
conditions:
Front Panel Power Indicator Is
Not Lit
No main power to the RKB-650. Check AC
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 trigger signal is present at rear panel 12V
TRIG IN connector.
No Sound
If the amp is getting AC power, but is produc-
ing no sound, check the PROTECTION INDI-
CATORS on the front panel. If lit, see below. If
not, check all of your connections and control
settings on associated components.
Protection Indicator Is Lit
The front panel PROTECTION INDICATORS
light when the RKB-650 protection circuits have
shut off the amplifier. Typically, this occurs 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 reset
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 into 8 ohms
(20-20k Hz, < 0.03% THD)
6x50 watts/ch into 8 ohms, all channels driven
Continuous Power Output into 4 ohms
(DIN 1 kHz,1.0% THD)
6 x 80 watts/ch into 4 ohms, all channels driven
Total Harmonic Distortion
(20Hz-20kHz, 8 ohms)
Continuous rated power: < 0.03%
One-half rated power: < 0.03%
1 watt power: < 0.03%
Intermodulation Distortion
(60 Hz: 7 kHz, 4:1)
< 0.03%
Damping Factor
(20-20,000 Hz, 8 ohms)
>200
Input Impedance
20 k Ohms
Input Sensitivity
1.0 volt
Amplifier Gain:
26 dB
Input Overload Level
5.0 volt
Peak Current
> 25 A
Frequency Response (±1 dB)
10Hz-100kHz
S/N Ratio (IHF A)
115 dB
Crosstalk/Separation
> 70 dB
Speaker Impedance
4 ohms minimum
Auto Turn On Level (with all inputs)
1 mV input signal
Power Requirements
USA: 120 Volts, 60 Hz
Europe: 230 Volts, 50 Hz
Power Consumption
450 Watts
Idle: 42 Watts
Standby: 2.6 Watts
Dimensions (W x H x D)
(not including rack adaptors)
430 x 144 x 429 mm
16.9 x 5.7 x 16.9 in
Weight (net)
15.5 kg, 34.1 lb.
Panel Height
3U, 132.6 mm/5.2 in
When sizing openings in custom cabinets, mea-
sure the unit to be installed and/or allow at least
1 mm clearance on all sides for unit to unit toler-
ances.
All specifications are accurate at the time of print-
ing. Rotel reserves the right to make improve-
ments without notice.
Rotel and the Rotel HiFi logo are registered trade-
marks of The Rotel Co, Ltd., Tokyo, Japan.
Speaker Connections
See Figure 2
The RKB-650 has two pair of color coded
connections for each group of amplifier
channels, one for the left speaker, the other
for the right speaker. Labels above the con-
nectors show the proper connections for
connecting speakers. These speaker con-
nectors 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 RKB-650 to the
speakers. Give yourself enough slack so you
can move the components enough 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 di-
rectly to the speaker connectors, separate the
wire conductors and strip back the insulation
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.
NOTE
: Be sure there are no loose wire strands
that could touch adjacent wires or connec-
tors.
For each group of channels, connect the left
speaker to the pair of speaker connectors la-
beled LEFT. Connect the right speaker to the
speaker connectors labeled RIGHT. Follow the
labels printed above the connectors, Make
sure that the positive terminal of the speaker
is connected to the + terminal on the ampli-
fier. Make sure that the negative terminal of
the speaker is connected to the – terminal of
the amplifier.