Rotel RB-1080 Manual do Proprietário descarregar pdf (Página 8)

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Protection Circuitry

The RB-1080 features a thermal protection cir-

cuit that protects the amplifier against potential

damage in the event of extreme or faulty

operating conditions. Unlike many designs,

the RB-1080’s protection circuit is indepen-

dent 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 tem-

peratures exceed safe limits.

Most likely, you will never see this protection

circuitry in action. However, should a faulty

condition arise, the amplifier will stop play-

ing and the LED indicator on the front panel

will light up.

If this happens, turn the amplifier off, let it cool

down for several minutes, and attempt to iden-

tify and correct the problem that caused the

protection circuitry to engage. When you turn

the amplifier back on, the protection circuit

will automatically reset and the indicator LED

should go out.

In most cases, the protection circuitry activates

because of a fault condition such as shorted

speaker wires, or inadequate ventilation lead-

ing to an overheating condition. In very rare

cases, highly reactive or extremely low im-

pedance speaker loads could cause the pro-

tection 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

The RB-1080 gives you a choice of two dif-

ferent kinds of input connections – conven-

tional unbalanced RCA type connections (such

as found on nearly all audio equipment) or

balanced XLR-type connections for use with

some high-end preamps or digital processors

featuring this lower noise connection.

NOTE: To prevent loud potentially damag-

ing noises, make sure the amplifier is

turned off when you make any changes to

the input signal configuration.

Input Selector Switch

Set the switch to select the inputs that are be-

ing used. Set it to Unbalanced if the RCA inputs

are used. Set it to Balanced if the XLR inputs

are used.

RCA Inputs (unbalanced)

See Figure 2

When a component with RCA connectors –

such as a preamplifier or surround sound pro-

cessor – supplies signals to the RB-1080, the

RCA-type phono plug inputs should be used.

Select high quality audio interconnect cables.

Connect each of the outputs from the pream-

plifier or signal processor to the correspond-

ing Unbalanced Input of the RB-1080.

XLR Inputs (balanced)

See Figure 3

If you are using one of the high-end pream-

plifiers or processors with low-noise balanced

signal outputs to drive your RB-1080, you may

choose to use these low-noise XLR-type con-

nections. See your authorized Rotel dealer for

the appropriate cables.

Connect XLR audio interconnect cables from

each of the outputs from the preamplifier or

signal processor to the corresponding Bal-

anced Input of the RB-1080.

Speaker Connection

Speaker Selection

We recommend using loudspeakers with a

nominal impedance of 4 ohms or higher with

the RB-1080. You should exercise some cau-

tion 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 RB-1080. See

your authorized Rotel dealer if you have any

questions.

Speaker Wire Selection

Use insulated two-conductor stranded wire to

connect the RB-1080 to the speakers. The size

and quality of the wire can have an audible

effect on the performance of the system. Stan-

dard 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 spe-

cial high-quality speaker cables. Your autho-

rized Rotel dealer can help in the selection

of appropriate cables for your system.

Polarity and Phasing

The polarity — the positive/negative orien-

tation of the connections — for every speaker

and amplifier connection must be consistent

so all the speakers will be in phase. If the po-

larity of one connection is mistakenly reversed,

bass output will be very weak and stereo im-

aging 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 insula-

tion 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.

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