MB QUART RAB 1450 - Manual (Page 5)

5
RAB 450 4-Channel Amplifier
AMPLIFIER FEATURE DESCRIPTION
1 3 4 2 5
7 9 8 6
10 11
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 CH1/2 MODE
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,
channels 1 & 2 level will be set by the LEVEL CH3/4 control
only, for an exact duplication of the 3 & 4 amplifier pair signal.
2. FR (FULL RANGE) passes the full frequency range from CH1/2
INPUT to the inter nal amplifiers.
3. HP (HIGH PASS) will send the range of frequencies above the
point set by the variable HIGH PASS control.
3 CH1/2 HIGH PASS
1. Variable HIGH PASS filter from 50 Hz to 5 kHz.
2. This control is bypassed when CH1/2 is in DUPE 3/4 or
FR (FULL RANGE) selection.
4 CH1/2 LEVEL
1. Sets CH1/2 input sensitivity to match the output level of the
radio/CD player.
2. Note that when the amps’ CH1/2 select switch is in the
DUPE CH3/4 position, the CH1/2 LEVEL control no longer af
fects CH1/2.
5 CH3/4 MODE
1. MONO is selected when bridging channels 3 & 4.
2. LP/BP (LOW PASS/BANDPASS) will route those frequencies
above the HIGH PASS setting and below the LOW PASS setting
to the internal amplifier. In this mode the HIGH PASS acts as a
SUBSONIC filter.
3. FR/HP (FULL RANGE/HIGH PASS) bypasses the LOW PASS
setting and the frequencies reproduced are anything to above
the HIGH PASS setting.
6 3&4 HIGH PASS
1. This high pass filter, variable from 10 Hz to 1 kHz, is per
manently connected to the input of the amplifier pair.
2. Since it can var y down to 10Hz, at that point it can be re
garded as full range.
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3. Having this per manently connected to the 3 & 4 pair, allows
us to use it at any time, either as a subsonic, when set from
20Hz to 40Hz or as the lower or high pass cut off frequency
control for active bandpass applications, in conjunction with
the LOW PASS filter when the CH3/4 MODE switch is in the
LOW PASS setting.
7 LOW PASS
1. Continuously variable low pass filter, 50 Hz to 5 kHz.
2. Signal routing and mode set by CH3/4 MODE and the LOW
PASS setting.
8 CH3/4 LEVEL
1. Sets CH3/4 input sensitivity to match the output level of the
radio/CD player.
2. Note that when the amps’ CH1/2 select switch is in the
DUPE CH3/4 position, the CH1/2 LEVEL control no longer af
fects CH1/2.
9 INPUT MODE
1. In the 2CH position, all four channels are provided signal
from the CH1/2 RCA Inputs.
2. In the 4CH position, channels 1/2 receive input from CH1/2
RCA inputs, and channels 3/4 receive input from CH3/4 RCA
inputs.
10 OUTPUT
1. This output can drive the input of other amplifiers in a
system (daisy chain).
2. In 4CH mode: Set switch 9 to 4CH. All 4 channels are mono
mixed and then fed to both line out RCAs. This provides a
front/rear mono signal for constant non-faded sub bass to feed
a sub amp.
3. In 2CH mode: Set switch 9 to 2CH. Only CH 1&2 are mono
mixed and fed to both line out RCAs.
11 INPUT
1. CH1-4 inputs to the amplifier, from the radio/CD line level
(RCA) source with a range of 0.2 volts to 6 volts.
2. Use a line converter if the radio/CD player has speaker (high
level) outputs only
3. Depending on your system layout, follow the input descripti-
ons in section “Amplifier applications” of this manual.