Technical Information
A-1
Date: April 29, 1997
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Model: |
RB 951 |
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Subject: Custom Installation Applications
The RB 951 Power Amplifier is extremely versatile in its ability to drive almost any loudspeaker. This versatility is multiplied by the RB 951s ability to operate in three different modes: STEREO, BRIDGED MONO AND PARALLEL MONO. Which mode of operation to use for a specific custom installation and how to configure the amplifier will be recommended in the following instructions.
Please do not attempt to configure the operation of the RB 951 unless you are confident in your understanding of these instructions. Please ensure that all five (5) pages of these instructions are included. These instructions will not be needed for basic Stereo operation of the RB 951.
There are eleven (11) adjustments (jumpers, variable resistors, and one switch) available to configure the operation of the RB 951. The factory preset positions are:
1.VR601/2: Two variable resistors are located on both sides of the RCA input jacks.
Turn the set screws fully clockwise for maximum signal power. Use a small flat head screwdriver to taper the amplifier output for precise speaker level matching.
2.S603/4: Two dual position shunt jumpers are located on the PCB at both sides of the RCA input jacks. Use the jumper to combine S603 pins 1-2 to enable VR601 and S604 pins 2-3 to enable VR602. Combine S603 pins 2-3 to bypass VR601 and S604 pins 1-2 to bypass VR602. (You must have the variable input resistors enabled to taper the amplifier output)
3.Bridged Mono / Normal Stereo: One dual position slide switch is located to the left of the input jacks (back panel view). Set the switch to the right for Normal Stereo and Parallel Mono operation. Set the switch to the left for Bridged Mono operation. (Recommendations regarding which mode of operation to use begins on page 2)
4.S602: One dual position shunt jumper is located on the PCB between S603 and
S604. Use the jumper to combine S602 pins 2-3 for Bridged Mono / Normal Stereo operation. Combine S602 pins 1-2 for Parallel Mono operation. (Recommendations regarding which mode of operation to use begins on page 2)
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5.P1/2/3: One 18AWG spade jumper is located on the PCB between the back panel and the power supply capacitors. Connect P1 to P3 for Bridged Mono / Normal Stereo operation. Connect P1 to P2 for Parallel Mono. (Recommendations regarding which mode of operation to use begins on page 2)
6.S605/6: Two dual position shunt jumpers are located on the PCB at both sides of the power supply filter capacitors. Use the jumper to combine S605 pins 2-3 and
S606 pins 2-3 for low input sensitivity (1.5V). Combine S605 pins 1-2 and S606 pins 1-2 for high input sensitivity (.775V). This adjustment will accommodate both high and low output preamps.
7.S607/8: Two dual position shunt jumpers are located on the PCB near the power transformer and the circuit breaker. Use the jumper to combine S607 pins 2-3 and
S608 pins 2-3 for Auto Turn On inactive. Combine S607 pins 1-2 and S608 pins 1-2 for Auto Turn On active. This feature will allow the amplifier to be turned on when a signal is sensed at the inputs. (The front panel power switch must be in to allow Auto Turn On to operate.)
NOTE: An asterisk appears on the PCB beside the factory preset position for the shunt jumpers.
There are three basic modes of operation for the RB 951:
•Stereo - Amplifier output provides high voltage and high current to drive one pair of 4 or 8 ohm speakers (or two pair of 8 ohm speakers connected in parallel) with two channels of music.
•Bridged Mono - Very high voltage and high current output to drive one large 8 ohm loudspeaker with one channel of music.. (Use two RB 951s in Bridged Mono mode for stereo)
•Parallel Mono - High voltage and very high current output to drive a number of small 4-8 ohm loudspeakers connected in parallel with one channel of music. (Use two RB 951s in Parallel Mono mode for stereo)
STEREO
The RB 951 is delivered from the factory in the Stereo mode configuration.
•No adjustment is necessary for two channel operation. In the event Stereo mode operation does not work, please check the settings for numbers 3, 4 and 5 above.
•Specific installations may require control of the variable inputs (numbers 1 and 2 above), input sensitivity adjustment (number 6 above) and Auto Turn On (number 7 above).
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