Rotel RMB-1587MKII Manuel D'utilisation page 10

10
If you are going to be away from home for an extended period of time
such as a month-long vacation, it is a sensible precaution to unplug your
amplifier (as well as other audio and video components) while you are away.
Power Switch and Power Indicator 1 1
The power switch is located on the front panel of your amplifier. To turn
the amplifier on, push the switch in. The ring around the switch will light
up, indicating that the amplifier is turned on. To turn the amplifier off,
push the button again and return it to the "out" position.
NOTE: Place the self adhesive ring over the light surrounding the Power
switch if the blue light is too bright.
12 Volt Trigger Input and Output 2 2
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. When
the trigger is connected to the IN the amplifier automatically uses the
12V trigger power control function. 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 12V trigger signal to other components. The 12V output signal
is available whenever a +12 volt trigger signal is applied to the IN connector.
Protection Circuitry 1 1
The RMB-1587MKII feature thermal and over-current protection circuits
that protect against potential damage in the event of extreme or faulty
operating conditions. Unlike many designs, these protection circuits are
independent of the audio signal and have no impact on sonic performance.
Instead, the protection circuits monitors the temperature of the output
devices and the current they are handling and shuts down the amplifier
if operating conditions 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 and the
Power Indicator on the front panel will blink.
If this happens, turn the amplifier off, let it cool down for several minutes,
and attempt to identify and correct the problem. When you turn the
amplifier back on, the protection circuit will automatically reset and the
Power Indicator 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.
Input Signal Connections 3
The RMB-1587MKII have conventional RCA type input connectors, the type
found on nearly all audio equipment. The
Balanced input connectors. Only one set of inputs should be connected.
Never connected both Balanced and
RMB-1587MKII also includes
RCA inputs at the same time.
RMB-1587MKII Seven Channel Power Amplifier
NOTE: To prevent loud potentially damaging noises, make sure the
amplifier is turned off when you make any changes to the input signal
configuration.
Select high quality audio interconnect cables. Connect each of the
outputs from the preamplifier or signal processor to the corresponding
input of the amplifier.
Speaker Connection
Speaker Selection
We recommend using loudspeakers with a nominal impedance of 4 ohms
or higher with the RMB-1587MKII. You should exercise some caution in
driving multiple pairs of speakers in parallel configuration, because the
effective impedance the amplifier sees is cut in half. For example, when
driving two pair of 8 ohm speakers, the amplifier sees a 4 ohm load.
When driving multiple speakers in parallel, it is recommended that you
select speakers with a nominal impedance of 8 ohms or higher. Speaker
impedance ratings are less than precise. In practice, very few loudspeakers
will present any problems for the RMB-1587MKII. See your authorized
Rotel dealer if you have any questions.
Speaker Wire Selection
Use insulated two-conductor stranded wire to connect the amplifier 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.
Polarity and Phasing
The polarity – the positive/negative orientation of the connections – for
every speaker and amplifier connection must be consistent so all the
speakers will be in phase. If the polarity of one connection is reversed,
bass output will be very weak and stereo imaging degraded. All wire is
marked so you can identify the two conductors. There may be ribs or
a stripe on the insulation of one conductor. The wire may have clear
insulation with different color conductors (copper and silver). There may
be polarity indications printed on the insulation. Identify the positive and
negative conductors and be consistent with every speaker and amplifier
connection.
Speaker Connections 5 5
NOTE: The following text describes both binding post and plug-in
connections. DO NOT use both connection methods in combination
to connect multiple speakers.
Turn off all the components in the system before connecting the speakers.
The RMB-1587MKII have two color coded binding posts, two for each
channel. These connectors accept bare wire, connector lugs, or dual
banana type connectors (except in the European Community countries
where their use is not permitted).
Route the wire from the amplifier to the speakers. Give yourself enough
slack so you can move the components to allow access to the speaker
connectors.