4 channel full range stereo, 2 or 3 channel system – MB QUART Onyx Amplifiers User Manual
Page 7
4-Channel Amplifiers
OA400.4 / OA600.4 / OA800.4
6
Ch1
Ch3
Ch2
Ch4
INPUT
CH3/4
CH1/2
OUTPUT
L
R
DUPE CH3/4 HP FULL
0dB 9dB
BASS EQ
X-OVER
10Hz 1.2KHz
10Hz 1.2KHz
HIGH PASS
HIGH PASS
6V 0.2V
6V 0.2V
LEVEL
LEVEL
LP/BP HP FULL
X-OVER
PROTECT
POWER
LOW PASS
30HZ 150hZ
INPUT MODE
4CH 2CH
FEATURES:
- 2 Sets of RCA inputs
- LEVEL: Variable sensitivity from 0.2V to 6V
- X-OVER: Selects internal crossover functions
- FULL: Bypasses all crossovers for full frequency operation
- LP/BP: Selects the built in LOW PASS filter, variable from 30Hz to 150Hz
- HP: Selects the built in HIGH PASS filter, variable from 10Hz to 1.2KHz
- DUPE 3/4: Allows CH1/2 to Duplicate the settings on CH3/4
- POWER LED: Indicates the powered up and turned on condition
- PROTECTION LED: Indicates a high voltage, low voltage, short circuit,
hard clip, over heating or DC fault condition.
- MODE: “2” indicates one set of RCA’s are being used. This will also pass signal to channels 3/4 through 1/2 inputs.
“4” indicates connecting 2 sets of RCA’s to 1/2 and 3/4 inputs.
- LINE OUTPUT: Full range RCA pass through.
- BASS EQ: Adjustable 45Hz bass boost from 0dB to 9dB
4 Channel Full Range Stereo:
Control checklist:
Interconnect cable checklist:
- Refer to the section “Settings for Best Performance”
- Connect the four inputs of the amplifier to a Radio/CD with quality RCA cables.
Switch setting checklist:
Minimum final loudspeaker impedances:
- 1/2CH X-OVER: FULL
- 2 ohm per channel.
- 3/4CH X-OVER: FULL
MODE: “4” since 2 sets of RCA’s are connected.
Important: Do not be tempted to connect the hot, or positive outputs, from any source together
2 or 3 Channel System:
to obtain a mono signal, as this could very well damage the output stage of that source.
- It is necessary to feed the SAME signal to both left and right inputs via a Y-adapter RCA cable.
Here we show how to use the 4 channel amplifiers as a 3 channel unit by taking
- Connect the mono speaker positive terminal to the RIGHT +, and its negative terminal to LEFT
advantage of the mono bridging capability of all MB Quart amplifiers. In order to create
- as shown.
a 2 channel system, simply follow the example to also mono bridge channel pair 1/2.
Interconnect cable checklist:
Switch setting checklist:
- Connect the inputs of channel pair 1/2 to a suitable stereo source, e.g. a head unit
- 1/2CH X-OVER: FULL
with good quality RCA cables.
- 3/4CH X-OVER: LP/BP
- A MONO signal source is required to bridge channel pair 3/4, such as would be
Control checklist:
available from the mono sub bass output of an active crossover, whether standalone, or
- Refer to the section “Settings for Best Performance”
built into a head unit or equalizer. If you only have 1 set of RCA outputs from your
Minimum final loudspeaker impedances:
headunit, you can simply connect those to the inputs for ch 1/2 and switch the MODE to
- 2 ohm per channel in stereo mode.
2ch. The amplifier will auto sum the signal and provide mono output for bridged
- 4 ohm mono bridged.
channels 3/4.
P
O
W
E
R
IN
P
U
T
P
O
W
E
R
IN
P
U
T
G
N
D
R
E
M
B
A
T
T
+
12
V
G
N
D
R
E
M
B
A
T
T
+
12
V
S
P
E
A
K
E
R
O
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P
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P
E
A
K
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P
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C
H
1
C
h
2
C
H
1
C
h
2
C
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3
C
h
4
C
H
3
C
h
4
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
B
R
ID
G
E
D
B
R
ID
G
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B
R
ID
G
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D
B
R
ID
G
E
D
F
U
S
E
F
U
S
E
STEREO LINE INPUT
MONO LINE INPUT
(Unless using procedure
listed above for 2ch)
C
h
1
C
h
1
C
h
3
C
h
3
C
h
2
C
h
2
C
h
4
C
h
4
IN
P
U
T
IN
P
U
T
C
H
3/4
C
H
3/4
C
H
1/2
C
H
1/2
O
U
T
P
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O
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P
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L
L
R
R
D
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C
H
3/4
H
P
F
U
L
L
D
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P
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C
H
3/4
H
P
F
U
L
L
0d
B
9
d
B
0d
B
9
d
B
B
A
S
S
E
Q
B
A
S
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Q
X
-O
V
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R
X
-O
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R
10
H
z
1
.2
K
H
z
10
H
z
1
.2
K
H
z
10
H
z
1
.2
K
H
z
10
H
z
1
.2
K
H
z
H
IG
H
P
A
S
S
H
IG
H
P
A
S
S
H
IG
H
P
A
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S
H
IG
H
P
A
S
S
6V
0
.2
V
6V
0
.2
V
6V
0
.2
V
6V
0
.2
V
L
E
V
E
L
L
E
V
E
L
L
E
V
E
L
L
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V
E
L
L
P
/B
P
H
P
F
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L
L
L
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/B
P
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P
F
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L
L
X
-O
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X
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P
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P
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L
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P
A
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L
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P
A
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30
H
Z
1
50
h
Z
30
H
Z
1
50
h
Z
IN
P
U
T
M
O
D
E
IN
P
U
T
M
O
D
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4C
H
2
C
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4C
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2
C
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