Rotel RB-951 mkII Owner's Manual download pdf (Page 12)

Specifications

Continuous Power Output Stereo Mode

(20-20 kHz, < 0.03% THD)

50 watts/ch into 8 ohms

Continuous Power Output Bridged Mono

Mode (20-20 kHz, < 0.1% THD)

150 watts/ch into 8 ohms

Total Harmonic Distortion

(20Hz-20kHz, 8 ohms)

< 0.03%

Intermodulation Distortion

(60 Hz : 7 kHz, 4:1)

< 0.03%

Frequency Response (±1 dB)

15Hz-100kHz

Damping Factor (20-20,000 Hz, 8 ohms)

280

Speaker Impedance (combined load)

Stereo mode: 4 ohms minimum

Bridged Mono mode: 8 ohms minimum

Parallel Mono mode: 2 ohms minimum

Signal to Noise Ratio (IHF A network)

116 dB

Input Impedance

32 k Ohms

Input Sensitivity

1.5 volt (low setting)

0.775 volt (high setting)

Auto Turn On Threshold Level (if activated)

10 mV input signal

Auto Turn Off Delay Time (if activated)

5 minutes with no signal

Power Requirements

USA: 115 Volts, 60 Hz

Europe: 230 Volts, 50 Hz

Power Consumption

200 Watts

Dimensions (W x H x D)

440 x 92 x 334 mm

3/8 x 35/8 x 131/4 in

Weight (net)

6.8 kg, 15 lb.

All specifications are accurate at the time of printing.

Rotel reserves the right to make improvements

without notice.

Input Sensitivity

(S605 and S606)

Jumper blocks S605 and S606 are used to

set the input sensitivity of the amplifier.

For high sensitivity (0.775v input for

rated power): place the jumpers across pins

1 and 2 on jumper blocks S605 and S606.

For low sensitivity (1.5v input for rated

power): place the jumpers across pins 2 and

3 on jumper blocks S605 and S606.

Selecting Parallel Mono Mode

(S602 and P1/P3)

As described earlier in this manual, the two

most common operating configurations for the

RB-951

MkII (Stereo mode and Bridged Mono

mode) are selectable with a back panel switch

and require no internal changes.

The third configuration, Parallel Mono mode,

allows both channels of the amplifier to be com-

bined in parallel. This mode is useful for driv-

ing a low impedance speaker load such as

driving multiple speakers in a custom instal-

lation.

This Parallel Mono mode can be selected only

by setting internal jumpers (jumper block S602)

and changing a buss wire connection (con-

nectors P1 and P2).

NOTE

: it is essential that Parallel Mono mode

not be engaged at the same time as Stereo

mode. This will blow the internal rail fuses.

Make sure that you follow all of the instruc-

tions below carefully.

To convert to Parallel Mono mode:

1. Place the jumper across pins 1 and 2 on

jumper block S602.

2. Locate the buss wire linking the P2 connector

to the P3 connector. Remove the wire from

P3 and move it to the adjacent P1 connector.

For Parallel Mono mode, the buss wire must

link P2 to P1.

To return to normal configuration (Ste-

reo or Bridged Mono modes):

1. Place the jumper across pins 2 and 3 on

jumper block S602.

2. Locate the buss wire linking the P2 connector

to the P1 connector. Remove the wire from

P1 and move it to the adjacent P3 connector.

For normal mode, the buss wire must link

P2 to P3.

Troubleshooting

Most difficulties in audio systems are the re-

sult of poor or wrong connections, or improper

control settings. If you encounter problems,

isolate the area of the difficulty, check the control

settings, determine the cause of the fault and

make the necessary changes. If you are un-

able to get sound from the RB-951

MkII, refer

to the suggestions for the following conditions:

Front Panel Power Indicator Is

Not Lit

No main power to the RB-951MkII. Check AC

power connections at the amplifier and the

AC outlet. Check the front panel power switch.

Make sure that it is set to the ON position. If

using signal sensing auto power-on, make sure

that a signal is present at the inputs. If using

12V trigger power-on, make sure that a trig-

ger signal is present at rear panel screw ter-

minals.

No Sound

If the amp is getting AC power, but is producing

no sound, check the PROTECTION INDICA-

TORS on the front panel. If lit, see below. If

not, check all of your connections and con-

trol settings on associated components. Make

sure that your input connections and speaker

connections match your selected stereo/mono

configuration.

Protection Indicator Is Lit

The front panel PROTECTION INDICATORS

light when the RB-951

MkII protection circuits

have shut off the amplifier. Typically, this oc-

curs 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. Then push

the front panel power switch in and out to re-

set the protection devices. If the problem is not

corrected or reoccurs, there is a problem with

the system or the amplifier itself.

RB-951MkII Stereo Power Amplifier

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Rotel RB-951 mkII Owner's Manual Page 12

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