MB QUART RAB 1450: AMPLIFIER FEATURE DESCRIPTION RAB 450 4-Channel Amplifier

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AMPLIFIER FEATURE DESCRIPTION

RAB 450 4-Channel Amplifier

English

1

LED INDICATORS

3. Having this per manently connected to the 3 & 4 pair, allows

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

us to use it at any time, either as a subsonic, when set from

applied.

20Hz to 40Hz or as the lower or high pass cut off frequency

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

control for active bandpass applications, in conjunction with

the LOW PASS filter when the CH3/4 MODE switch is in the

2

CH1/2 MODE

LOW PASS setting.

1. DUPE CH3/4 routes signal as selected by the amps 3 & 4

SELECT to the 1 & 2 amplifier pair. Note that in this case,

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LOW PASS

channels 1 & 2 level will be set by the LEVEL CH3/4 control

1. Continuously variable low pass filter, 50 Hz to 5 kHz.

only, for an exact duplication of the 3 & 4 amplifier pair signal.

2. Signal routing and mode set by CH3/4 MODE and the LOW

2. FR (FULL RANGE) passes the full frequency range from CH1/2

PASS setting.

INPUT to the inter nal amplifiers.

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

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CH3/4 LEVEL

point set by the variable HIGH PASS control.

1. Sets CH3/4 input sensitivity to match the output level of the

radio/CD player.

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CH1/2 HIGH PASS

2. Note that when the amps’ CH1/2 select switch is in the

1. Variable HIGH PASS filter from 50 Hz to 5 kHz.

DUPE CH3/4 position, the CH1/2 LEVEL control no longer af

2. This control is bypassed when CH1/2 is in DUPE 3/4 or

fects CH1/2.

FR (FULL RANGE) selection.

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INPUT MODE

4

CH1/2 LEVEL

1. In the 2CH position, all four channels are provided signal

1. Sets CH1/2 input sensitivity to match the output level of the

from the CH1/2 RCA Inputs.

radio/CD player.

2. In the 4CH position, channels 1/2 receive input from CH1/2

2. Note that when the amps’ CH1/2 select switch is in the

RCA inputs, and channels 3/4 receive input from CH3/4 RCA

DUPE CH3/4 position, the CH1/2 LEVEL control no longer af

inputs.

fects CH1/2.

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OUTPUT

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CH3/4 MODE

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

1. MONO is selected when bridging channels 3 & 4.

system (daisy chain).

2. LP/BP (LOW PASS/BANDPASS) will route those frequencies

2. In 4CH mode: Set switch 9 to 4CH. All 4 channels are mono

above the HIGH PASS setting and below the LOW PASS setting

mixed and then fed to both line out RCAs. This provides a

to the internal amplifier. In this mode the HIGH PASS acts as a

front/rear mono signal for constant non-faded sub bass to feed

SUBSONIC filter.

a sub amp.

3. FR/HP (FULL RANGE/HIGH PASS) bypasses the LOW PASS

3. In 2CH mode: Set switch 9 to 2CH. Only CH 1&2 are mono

setting and the frequencies reproduced are anything to above

mixed and fed to both line out RCAs.

the HIGH PASS setting.

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INPUT

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3&4 HIGH PASS

1. CH1-4 inputs to the amplifier, from the radio/CD line level

1. This high pass filter, variable from 10 Hz to 1 kHz, is per

(RCA) source with a range of 0.2 volts to 6 volts.

manently connected to the input of the amplifier pair.

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

2. Since it can var y down to 10Hz, at that point it can be re

level) outputs only

garded as full range.

3. Depending on your system layout, follow the input descripti-

ons in section “Amplifier applications” of this manual.