Power Switch And Indicator Light; Auto Turn On/Off Mode Selector; 12V Trigger Input; 12V Trigger Output - Rotel RMB-1506 Owner's Manual

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Power Switch and Indicator Light

The power switch is located on the left side of the front panel. To turn
the amplifi er on (or to activate either of the optional automatic power-
on modes), push the switch in.
The indicator light around the switch will light, indicating that the
amplifi er is turned on. To turn the amplifi er off, push the button again
and return it to the out position.

Auto Turn On/Off Mode Selector

The RMB-1506 provides three different options for manual or
automatic power on/off operation. These modes are selectable using
a three-position slide switch on the back panel as follows:
• With the switch in the OFF position, the amplifi er 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
amplifi er.
• With the switch in the SIGNAL SENSE position, the
amplifier turns on automatically when a signal is detected at the
inputs. The amplifier will go into standby mode several minutes
after no signal is no longer 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 position, the amplifi er is
turned on automatically when a 12 volt trigger signal is present
at the 12V TRIG input to the left of the switch. The amplifi er goes
into standby mode if the +12 volt signal is not present. The front
panel POWER SWITCH overrides this function. It must be ON for
the +12V trigger to work. Turning the switch OFF cuts power to the
amplifi er, regardless of whether or not a trigger signal is present.

12V Trigger Input

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An input jack for connecting the wires carrying a +12 volt trigger
signal from a Rotel preamp or surround sound processor to turn the
amplifi er on and off. To use this feature the adjacent slide switch must
be placed to the left position (see previous section).
The TRIGGER INPUT accepts any control signal (AC or DC) ranging
from 3 volts to 30 volts. Use a cable with mono 3.5 mm mini-plugs on
both ends. The +12 V DC signal appears at the "tip" connector.

12V Trigger Output

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The 12V TRIG jack labeled OUT is used to pass the remote turn-on
signal to a second Rotel amplifi er. Any 12V Trigger signal at the
INPUT jack will be passed through to the OUT jack.

Circuit Breaker

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A circuit breaker on the rear panel protects the amplifi er'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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RMB-1506 Six Channel Power Amplifi er

Protection Indicators

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A thermal protection circuit protects the amplifi er against potential
damage in the event of extreme or faulty operating conditions. Unlike
many designs, the RMB-1506's protection circuit is independent of the
audio signal and has no impact on sonic performance. Instead, the
protection circuit monitors the temperature of the output devices and
shuts down the amplifi er if temperatures exceed safe limits.
In addition, the RMB-1506 includes overcurrent protection which
operates only when load impedance drops too low.
Should a faulty condition arise, the amplifi er will stop playing and
one or more of the PROTECTION LEDS on the front panel will light.
If this happens, turn the amplifi er off, let it cool down for several
minutes, and attempt to identify and correct the problem. There are
independent PROTECTION LEDS for each pair of channels which may
help in troubleshooting the cause of the problem. When you turn the
amplifi er back on, the protection circuit will automatically reset and the
PROTECTION LEDS should go out.
In most cases, the protection circuitry activates because of a fault
condition such as shorted speaker wires, or inadequate ventilation
causing an overheating condition. In very rare cases, highly reactive
or extremely low impedance speaker loads could cause the protection
circuit to engage.

Signal Connections

The RMB-1506 provides standard conventional input connections
— unbalanced RCA type connections as found on nearly all audio
equipment.
There is also a pair of SIGNAL OUTPUT LINK connections for passing
the input signal connected to the "A" pair of channels on to another
audio component. Additionally, the input signal to the "A" pair of
channels can be automatically linked to the inputs for the "B" and/or
"C" channels, so that a separate input signal cable is not required for
those channels, for example in large systems where the RMB-1506 is
being used to drive multiple pairs of speakers.

RCA Inputs

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See Figure 2
There are two RCA inputs for each of the three pair of amplifi er
channels. These RCA inputs accept audio signals from preamplifi ers or
surround sound processors. Use high quality audio interconnect cables
for best performance.
For each pair of amplifi er channels, connect the left channel output of
your preamp to the LEFT INPUT on the RMB-1506. Connect the right
channel of your preamp to the RIGHT INPUT. Make sure that the input
slide switch to the right of the RCA inputs is in the STEREO position.

Mono Switch

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When the MONO switch is in the ON position, the "A" left channel
input is connected to the right channel.