Crunch DRA1050.4, User Manual, Page: 6 / 10

DRA1050.4 / DRA1450.4 / DRA2450.4 / DRA4050.4 4 CHANNEL AMPLIFIER APPLICATIONS
4 CHANNEL FULL RANGE SYSTEM
2 or 3 CHANNEL FULL RANGE SYSTEM
Crossover frequency control checklist:
Here we show how to use the 4 channel amplifiers as straight forward discrete 4 channel
Channels 1/2: full range units.
- HI PASS: N/A
- LOW PASS: N/A
Interconnect cable checklist:
- Connect the four inputs of the amplifier to a Radio/CD with quality RCA cables.
Channels 3/4:
- HI PASS: N/A
Switch setting checklist:
- LOW PASS: N/A
- 1/2CH X-OVER: FULL
- 3/4CH X-OVER: FULL Level control checklist:
“Setting up systems after installation for best performance” MODE: - Refer to the section - 4 CHANNEL
Minimum final loudspeaker impedances:
- 2-Ohms per channel.
Crossover frequency control checklist: Here we show how to use the 4 channel amplifiers as full range 2 or 3 channel units by
Channels 1/2: taking advantage of the mono bridging capability of all Crunch amplifiers.
- HI PASS: N/A
The following example shows how to create a 3 channel system by mono bridging
- LOW PASS: N/A
channel pair 3 / 4. In order to create a 2 channel system, simply follow the example to
also mono bridge channel pair 1 / 2.
Channels 3/4:
- HI PASS: N/A
Interconnect cable checklist:
- LOW PASS: N/A
- Connect the inputs of channel pair 1/2 to a suitable stereo source, e.g. a head unit
with good quality RCA cables.
TIP: If you are using the mono sub bass output of an active crossover, there is nothing
- A MONO signal source is required to bridge channel pair 3/4, such as would be
wrong with switching in the low pass filter in these amplifiers for a steeper low pass
available from the mono sub bass output of an active crossover, whether standalone,
rolloff.
or built into a head unit or equalizer.
Important: Do not be tempted to connect the hot, or positive outputs, from any source
Level control checklist:
together to obtain a mono signal, as this could very well damage the output stage of
- Refer to the section “Setting up systems after installation for best performance”
that source.
- It is necessary to feed the SAME signal to both left and right inputs via a Y-adapter
Minimum final loudspeaker impedances:
RCA cable.
- 2-Ohms per channel in stereo mode.
- Connect the mono speaker positive terminal to the CH4 +, and its negative terminal
- 4-Ohms mono bridged.
to CH3 - as shown.
Switch setting checklist:
- 1/2CH X-OVER:
FULL
- 3/4CH X-OVER: FULL
- MODE: 3 CHANNEL
1 STEREO
1 MONO
FULL RANGE
LINE INPUTS
DRIVE
DRIVE
REMOTE TURN-ON
REMOTE TURN-ON
CHASSIS GROUND
CHASSIS GROUND
TO B 12 volts VIA FUSE
TO B 12 volts VIA FUSE
G
N
D
R
EM
+
12
V
G
N
D
R
EM
+
12
V
FULL RANGE
STEREO LINE INPUTS
F
L
A
S
H
N
O
F
L
A
S
H
M
O
D
E
X
-O
V
E
R
X
-O
V
E
R
2C
H
3C
H
4C
H
F
U
L
L
H
P
F
L
P
F
C
H
3
C
H
4
C
H
1
C
H
2 IN
P
U
T
O
U
T
P
U
T
IN
P
U
T
H
P
F
L
P
F
F
U
L
L
G
N
D
C
H
1
G
N
D
C
H
2
C
H
3
C
H
4
H
IG
H
I
N
P
U
T
B
A
S
S
E
Q
0
d
B
1
2
d
B
6
V
0
.2
V
6
V
0
.2
V
3
0
H
z
2
5
0
H
z
L
P
F
6
0
H
z
1
.2
k
H
z
H
P
F
L
E
V
E
L
C
H
A
N
N
E
L
1
/2
L
E
V
E
L
B
A
S
S
E
Q
0
d
B
1
2
d
B
H
P
F
L
P
F
C
H
A
N
N
E
L
3
/4
6
0
H
z
1
.2
k
H
z
3
0
H
z
2
5
0
H
z
F
L
A
S
H
N
O
F
L
A
S
H
M
O
D
E
X
-O
V
E
R
X
-O
V
E
R
2C
H
3C
H
4C
H
F
U
L
L
H
P
F
L
P
F
C
H
3
C
H
4
C
H
1
C
H
2 IN
P
U
T
O
U
T
P
U
T
IN
P
U
T
H
P
F
L
P
F
F
U
L
L
G
N
D
C
H
1
G
N
D
C
H
2
C
H
3
C
H
4
H
IG
H
I
N
P
U
T
B
A
S
S
E
Q
0
d
B
1
2
d
B
6
V
0
.2
V
6
V
0
.2
V
3
0
H
z
2
5
0
H
z
L
P
F
6
0
H
z
1
.2
k
H
z
H
P
F
L
E
V
E
L
C
H
A
N
N
E
L
1
/2
L
E
V
E
L
B
A
S
S
E
Q
0
d
B
1
2
d
B
H
P
F
L
P
F
C
H
A
N
N
E
L
3
/4
6
0
H
z
1
.2
k
H
z
3
0
H
z
2
5
0
H
z
B
R
ID
G
ED
B
R
ID
G
ED
B
R
ID
G
ED
B
R
ID
G
ED
-
C
H
1
+
-
C
H
2
+
-
C
H
1
+
-
C
H
2
+
-
C
H
3
+
-
C
H
4
+
-
C
H
3
+
-
C
H
4
+
FULL RANGE
SPEAKERS
FULL RANGE
SPEAKERS CH1/2
MONO SPEAKER
OR SUBWOOFER CH3/4