Bedienungsanleitung Rotel RMB-1575 Verstärker

Bedienungsanleitung

8

RMB-1565 / RMB-1575 Five Channel Power Amplifi ers

+12V Trigger Input and Output

5

The jack labeled IN is for connecting the 3.5mm Plug/Cable carrying

a +12 volt trigger signal to turn the amplifi er on and off. To use this

feature the adjacent switch must be placed to the 12V TRIG position

(see previous section). 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 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 Indicator

2

Thermal and protection circuits protect the amplifi er against potential

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

many designs, the protection circuit in the RMB-1565 and RMB-1575

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 safe limits are

exceeded.

In addition, the amplifi er includes over-current protection which

operates only when load impedances drop too low. This protection is

independent for each of the fi ve channels .

Should a faulty condition arise, the amplifi er channel at fault will stop

playing and the PROTECTION LED 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. When you

turn the amplifi er back on, the protection circuit will automatically reset

and the PROTECTION LED should go out.

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.

Input Signal Connections

4

See Figure 2

The RMB-1565 and RMB-1575 have standard unbalanced RCA-type

input connectors, the type used on nearly all audio equipment. There is

an RCA input for each of the fi ve 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.

Speakers

The RMB-1565 and RMB-1575 have fi ve sets of speaker connectors,

one for each amplifi er channel.

Speaker Selection

The nominal impedance of the loudspeaker(s) connected to each

channel of the amplifi er in the various operating modes should be no

lower than 4 ohms.

Speaker Wire Selection

Use insulated two-conductor stranded wire to connect the amplifi er 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 appropriate cables for your system.

Polarity and Phasing

The polarity – the positive/negative orientation of the connections

– for every speaker and amplifi er connection must be consistent so

all the speakers will be in phase. If the polarity of one connection is

mistakenly 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 amplifi er connection.

Speaker Connections

3

See Figure 2

Note: The following text describes both binding post and

plug-in connections. DO NOT use both connection methods in

combination to connect multiple speakers.

The RMB-1565 and RMB-1575 have two color coded terminals for

each amplifi er channel. 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 amplifi er to the 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).

Bewertung

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