Crunch DRA1050.4, User Manual, Page: 7 / 10

Basic application
Crossover frequency control checklist: These sub bass amplifiers can be used in any of the bi-amplification systems described in
LOW PASS: 80Hz (approximately 11 o’clock)
this manual, replacing the 2 channel amplifiers as per the illustrations.
SUBSONIC:35Hz (approximately 1 o’clock)
BASS EQ: 12 o’clock max
Interconnect cable checklist:
Connect the inputs to a suitable source, e.g. a head unit with good quality RCA cables.
Connect the LINE OUT to the inputs of the system highs amplifier.
Level control checklist:
Refer to the section “Setting up systems after installation for best performance”
Use at least #12 gauge speaker wiring. The amps have dual speaker terminals,
simplifying the hookup of multiple speakers.
These are 1 channel amplifiers .
Minimum final loudspeaker impedance: 1-Ohm.
FULL RANGE
STEREO LINE INPUT
NOT USED
Y-ADAPTOR
Note: You can use the Radio/CD designated mono line output or a full range stereo line output.
For full range stereo line output, you will need an optional “Y-Adaptor” as shown.
DRA1850.1D / DRA2550.1D / DRA3250.1D D-CLASS 1 CHANNEL AMPLIFIER APPLICATION
PARALLEL MONO
SUBWOOFERS
2- OHMS EACH MINIMUM
DRIVE
MONO LINE INPUT
VIA Y-ADAPTER
FROM MONO SOURCE
MONO
SUBWOOFER
P
O
W
E
R
S
P
E
A
K
E
R
F
U
S
E
G
N
D
R
E
M
+
12
V
-
-
+
+
REMOTE TURN-ON
CHASSIS GROUND
TO B 12 Volts VIA FUSE
F
L
A
S
H
N
O
F
L
A
S
H
3
0
H
z
2
5
0
H
z
L
O
W
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S
S
L R
L R
O
U
T
P
U
T
IN
P
U
T
L
E
V
E
L
B
A
S
S
E
Q
0
d
B
6
V
0
.2
V
1
0
d
B
C
O
N
T
R
O
L
R
E
M
O
T
E
1
5
H
z
3
5
H
z
S
U
B
S
O
N
IC
P
O
W
E
R
S
P
E
A
K
E
R
F
U
S
E
G
N
D
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M
+
12
V
-
-
+
+