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4-Channel Amplifiers
Q4.80 / Q4.150
4
4 Channel Full Range Stereo:
INPUT MODE: 4CH since 2 sets of RCA’s are connected.
Interconnect cable checklist:
- Connect the four inputs of the amplifier to a Radio/CD with quality RCA cables.
Control checklist:
Switch setting checklist:
- Refer to the section “Settings for Best Performance”
- 1/2CH X-OVER: HP-FULL
- MULTIPLIER FREQUENCY: X1
Minimum final loudspeaker impedances:
- FILTER SLOPE: 12dB
- 2 ohm per channel.
- 3/4CH X-OVER: HP-FULL
- Connect the mono speaker positive terminal to the Ch3 +, and its negative terminal to Ch4 - as
2 or 3 Channel System:
shown.
Here we show how to use the 4 channel amplifiers as a 3 channel unit by taking
advantage of the mono bridging capability of all MB Quart amplifiers. In order to create
Switch setting checklist:
a 2 channel system, simply follow the example to also mono bridge channel pair 1/2.
- 1/2CH X-OVER: HP-FULL
Interconnect cable checklist:
- Connect the inputs of channel pair 1/2 to a suitable stereo source, e.g. a head unit
with good quality RCA cables.
- 3/4CH X-OVER: LP-BP MONO
- A MONO signal source is required to bridge channel pair 3/4, such as would be
available from the mono sub bass output of an active crossover, whether standalone, or
INPUT MODE: 4CH, Stereo Left and Right to CH1&2 and MONO to CH3&4
built into a head unit or equalizer.
Important: Do not be tempted to connect the hot, or positive outputs, from any source
Control checklist:
together to obtain a mono signal, as this could very well damage the output stage of
- Refer to the section “Settings for Best Performance”
that source.
Minimum final loudspeaker impedances:
- 2 ohm per channel in stereo mode.
- It is necessary to feed the SAME signal to both left and right inputs via a Y-adapter
- 4 ohm mono bridged.
RCA cable.
- MULTIPLIER FREQUENCY: X1
- FILTER SLOPE: 12dB
OUT
CH3
CH1
CH4
CH2
INPUT
POWER INPUT
GND REM BATT+12V
SPEAKER OUTPUT
Ch1 Ch2
Ch3 Ch4
- + - + - + - +
BRIDGED BRIDGED
SPEAKER OUTPUT
Ch1 Ch2
Ch3 Ch4
- + - + - + - +
BRIDGED BRIDGED
FUSE
OUT
CH3
CH2
CH4
CH1
INPUT
POWER INPUT
GND REM BATT+12V
STEREO LINE INPUT
MONO LINE INPUT
CROSSOVER
INPUT MODE
4CH 2CH
CROSSOVER
PROTECT
POWER
LEVEL
CLIP INDICATOR
CLIP INDICATOR
GREEN-
PRE CLIP
GREEN-
PRE CLIP
AMBER-
SOFT CLIP
AMBER-
SOFT CLIP
RED-
HARD CLIP
RED-
HARD CLIP
LEVEL
BASS BOOST
BASS BOOST
BASS FREQUENCY
HIGH PASS
LOW PASS
MULTIPLIER
FREQUENCY
FILTER SLOPE
HIGH PASS
CHANNELS 1&2
CHANNELS 3&4
9V
0dB
9V
0dB
30Hz
15Hz
40Hz
0.2V
12dB
X15 X1
6dB 12dB
DUPE HP-FULL
(3&4)
LP-BP LP-BP HP-FULL
MONO STEREO
(x1) 20Hz 300Hz
(x15) 300Hz 4.5KHz
0.2V
12dB
80Hz
1KHz
4.5KHz
CROSSOVER
INPUT MODE
4CH 2CH
CROSSOVER
PROTECT
POWER
LEVEL
CLIP INDICATOR
CLIP INDICATOR
GREEN-
PRE CLIP
GREEN-
PRE CLIP
AMBER-
SOFT CLIP
AMBER-
SOFT CLIP
RED-
HARD CLIP
RED-
HARD CLIP
LEVEL
BASS BOOST
BASS BOOST
BASS FREQUENCY
HIGH PASS
LOW PASS
MULTIPLIER
FREQUENCY
FILTER SLOPE
HIGH PASS
CHANNELS 1&2
CHANNELS 3&4
9V
0dB
9V
0dB
30Hz
15Hz
40Hz
0.2V
12dB
X15 X1
6dB 12dB
DUPE HP-FULL
(3&4)
LP-BP LP-BP HP-FULL
MONO STEREO
(x1) 20Hz 300Hz
(x15) 300Hz 4.5KHz
0.2V
12dB
80Hz
1KHz
4.5KHz
FUSE