Rotel RB971 User Manual download pdf (Page 8)

Bridged Mono Operation

[See Figure 3 for bridged operation jumper setting and connec-

tion illustration.]

The two channels of the RB-971 can be “bridged”. In this configu-

ration the single channel produces a massive 200 watts! This fea-

ture allows you to increase the overall power output of your

system by bridging the RB-971 and adding a second bridged RB-

971. Or the RB-971 is bridged to drive a monophonic subwoofer.

Note however that when the RB-971 is bridged the speaker con-

nected to it must have an impedance of 8 ohms or more.

In order to use the RB-971 in bridged mode, three “jumper” con-

nectors inside the amplifier must be moved from one set of pins to

another. This task should be done by a qualified technician. See

your Rotel audio retailer. In addition the RB-971 is connected to

the other components in a different way. When the RB-971 is

setup for bridged operation the Bridged Mono indicator light on

the front panel will light.

Resetting Jumpers

Before opening the RB-971 cabinet to reset the jumpers, the

power cord must be unplugged from the wall. DO NOT OPEN THE

CABINET OF THE RB-971 BEFORE THE POWER CORD HAS BEEN

UNPLUGGED FROM THE WALL. FAILURE TO DO SO WILL EXPOSE

YOU TO HAZARDOUS VOLTAGES.

After the power cord has been unplugged, remove the screws

that hold the cabinet cover in place and slide the cover off the

amplifier. Locate the three jumper pin blocks labeled S 601, S 602

and S 603. The factory standard (stereo) position of the jumpers is

on pins 1 and 2 of each block. There is a * mark on the circuit

board next to this position. To convert the RB-971 to bridged mono

move all three jumpers so they are on pins 2 and 3 of each jumper

pin block. Replace the cover of the cabinet.

Do not plug the RB-

971 power cord back into the wall outlet until the cabinet cover

has been replaced.

Input Connection

When using the RB-971 in bridged mono mode, connect the cable

from the preamplifier output to the left input. No connection is

made to the right input.

Bridged Speaker Connection

When using the RB-971 in bridged mono mode, the wire to the

speakers is connected to the positive terminals of the left and

right channels. Connect the wire that goes to the positive termi-

nal of the speaker to the positive terminal of the left channel of

the RB-971. Connect the wire that goes to the negative terminal

of the speaker to the positive terminal of the right channel of the

RB-971. No connections are made to the negative terminals of

the RB-971.

Troubleshooting

Most difficulties in audio systems are the result of poor or wrong

connections, or improper control settings. If you encounter prob-

lems, isolate the area of the difficulty, check the control settings,

determine the cause of the fault and make the necessary

changes. If you are unable to get sound from the RB-971, refer to

the suggestions for the following conditions:

Front Panel Power Indicator Is Not Lit

No main power to the RB-971. Check the front panel power

switch. Make sure that it is set to the on position. Check AC power

connections at the amplifier and the AC outlet.

Fuse Replacement

If everything checks out correctly and you still cannot get the am-

plifier to turn on, the internal power fuse may have blown. If you

believe this has happened, contact your Rotel dealer for informa-

tion on where to take your amplifier to get the fuse replaced.

No Sound

If the amp is getting AC power, but is producing no sound. Typi-

cally, this occurs only when the ventilation openings are blocked,

when there is faulty speaker wiring, or after a period of extreme

use. Turn off the system and wait for the amp to cool. Check all of

your connections and control settings on associated components.

Pay particular attention to the speaker wire connections. Push the

front panel power switch in. If the problem is not corrected or re-

occurs, there is a problem with the system or the amplifier itself.

STEREO POWER AMPLIFIER RB-971

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Rotel RB971 User Manual Page 8

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