MB QUART Reference Amps: RAB 250 2-Channel AmplifierAMPLIFIER FEATURE DESCRIPTION

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RAB 250 2-Channel Amplifier AMPLIFIER FEATURE DESCRIPTION

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1  LED INDICATORS

1. POWER: Lights up when power and remote turn on is 

applied.

2. DIAGNOSTICS: When lit, will indicate a fault condition.

2  LOW PASS MODE

1. Selectable in STEREO mode or MONO mode.

3  AMPLIFIER MODE

1. Selects the frequency range to be amplified and routed to 

the loudspeakers.

2. The FR (FULL RANGE) setting passes the full frequency range 

from the INPUT to the internal amplifiers.

3. HP (HIGHPASS) will send the range of frequencies above the 

point set by the CROSSOVER FREQ SELECT controls.

4. LP (LOW-PASS) will route those frequencies below the 

CROSSOVER FREQ SELECT controls to the internal amplifiers.

4  CROSSOVER RANGE

1. T he CROSSOVER RANGE selector configures the output of 

the crossover for X1 or X10 frequency multiplier.

5  CROSSOVER FREQUENCY

1. The variable pot sets the crossover frequency point for both 

high and low pass.

2. The CROSSOVER RANGE switch is a multiplier for the 

variable control, for a total adjustment of 10 Hz to 480 Hz in 

2 ranges.

6  LEVEL

1. Sets the amplifier input sensitivity to match the output level 

of the radio/CD player.

2. Note: Check your radio/CD player manual for the correct line 

level sensitivity and adjust the amplifier level control to match.

7  OUTPUT

1. This output can drive the input of other amplifiers in a 

system (daisy chain). 

8  INPUT

1. LEFT and RIGHT inputs to the amplifier, from the radio/CD 

line level (RCA) source with a range of 0.6 volts to 6 volts.

2. Use a line converter if the radio/CD player has speaker  

(high level) outputs only.