Manual Rotel RMB-1512 (page 8 of 11) (English)

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RMB-1512 Twelve Channel Power Ampliﬁer

12V Trigger Input

An input jack for connecting the wires carrying a +12 volt trigger

signal from a Rotel preamp or surround sound processor to turn the

ampliﬁer 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 +12V DC signal appears at the “tip” connector.

12V Trigger Output

The 12V TRIG jack labeled OUT is used to pass the remote turn-on

signal to a second Rotel ampliﬁer. Any 12V Trigger signal at the

INPUT jack will be passed through to the OUT jack.

Protection Indicators

A thermal protection circuit protects the ampliﬁer against potential

damage in the event of extreme or faulty operating conditions. Unlike

many designs, the RMB-1512’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 ampliﬁer if temperatures exceed safe limits.

In addition, the RMB-1512 includes overcurrent protection which

operates only when load impedance drops too low.

Should a faulty condition arise, the ampliﬁer will stop playing and

one or more of the PROTECTION LEDS on the front panel will light.

If this happens, turn the ampliﬁer 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

ampliﬁer 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.

Note: The protection LED also light when the 12V Trigger system is

being used and the amplifier is in Standby mode.

Signal Connections

The RMB-1512 provides standard conventional input connections

— unbalanced RCA type connections as found on nearly all audio

equipment.

In addition to the six groups of stereo inputs labeled INPUT 1 to

INPUT 6, there is a pair of inputs labeled LINK IN. There is also

a pair of SIGNAL OUTPUT LINK connections for passing the input

signal connected to the LINK IN pair of inputs on to another audio

component.

Additionally, the input signal to the LINK IN connectors can be

automatically linked to the inputs for any of the channel INPUTS 1-6,

so that a separate input signal cable is not required for those channels,

for example in large systems where the RMB-1512 is being used to

drive multiple pairs of speakers.

RCA Inputs

See ﬁgure 2

are two RCA inputs for each of the six pair of ampliﬁer channels.

These RCA inputs accept audio signals from preampliﬁers or surround

sound processors. Use high quality audio interconnect cables for best

performance.

For each pair of ampliﬁer channels, connect the left channel output of

your preamp to the LEFT INPUT on the RMB-1512. 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.

Linking the Inputs

You can link the inputs for any of the group 1–6 inputs by moving the

input slide switch below each pair of RCA inputs to the LINK position.

When linked, no input connection is required for that group. The

input signal from the LINK IN connections is sent to the linked pair of

channels, allowing you to use up to twelve ampliﬁer channels with the

same stereo input signals.

Mono Switch

For the groups INPUT 1 and INPUT 2, when the input slide switch is

moved to the MONO position, the left and/or right channel input is

provided to both speakers as a mono signal.

Input Level Controls

Six controls on the front panel, one for each pair of channels, provide

input level adjustments. These allow you to adjust the gain of the

ampliﬁer to match other components in the system. The INPUT 1 level

control changes the gain of the INPUT 1 channels; the INPUT 2 level

control changes the INPUT 2 channels and so on. To adjust these

controls, use a small, ﬂatblade screwdriver. Turn the control clockwise

to increase gain. Turn counterclockwise to reduce gain.

Signal Output Link

This pair of RCA connections can be used to pass unprocessed input

signals to another audio component, for example to “daisy-chain” an

additional ampliﬁer to drive an additional set of speakers. The input

signals connected to the LINK IN connectors is available at these LINK

OUT outputs. This is typically used when the ampliﬁer is part of a multi-

room system.

Note: The input signals from the LINK IN inputs can also be linked

to any of the INPUT 1-6 inputs by moving the INPUT SELECT switch

associated with that pair of channels to the LINK position.

Speakers

See Figure 2

The RMB-1512 has six groups of speaker connectors, one for each

pair of ampliﬁer channels. The twelve channels may be used in many

different conﬁgurations. The Hook-up Illustration, Figure 2, shows just

one example, with the connections for a typical six-speaker system.

Here, the remaining six channels are still available to power up to six

further speakers as required, whether these are additions to the main

system or independent of it.

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Rotel RMB-1512 Manual

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