SS75.4 / SS125.4 / 4 CHANNEL AMPLIFIER APPLICATIONS
7
2 way active, or bi-amplified system with mono bass
2 way active, or bi-amplified system with mono bass, and faded highs/lows
This application shows how easily a 2 way active system can be implemented
Channels 3/4:
using a 4 channel amplifier. Channels 1 and 2 will be used for highs, and
channels 3 and 4 for mono bass.
- HI PASS (subsonic): 20 Hz
- LOW PASS: 100 Hz
Interconnect cable checklist:
- We need to feed the same signal to both sets of channels, so must use 2 Y-
Please note that these frequency points are suggestions only. Refer to the
adapters, one to feed the LEFT signal to channels 1 and 3, and the right signal to
loudspeaker manufacturer specifications and the section
“Setting up systems
channels 2 and 4, as shown.
after installation for best performance”
Mono bass woofer wiring:
Level control checklist:
- Connect the mono speaker positive terminal to the LEFT +, and its negative
Refer to the section
“Setting up systems after installation for best performance”
terminal to RIGHT -.
Minimum final loudspeaker impedances:
Switch setting checklist:
- 2-Ohms per channel in stereo mode.
- 1/2CH X-OVER:
HP
- 4-Ohms mono bridged.
- 3/4CH X-OVER:
LP
Crossover frequency control checklist:
Channels 1/2:
- HI PASS: 100 Hz
- LOW PASS: N/A
Here we present a variation of the previous system. Since this is a 2 way
system, we can use the front outputs from a head unit to drive the highs, and the
rear output to drive the bass This method allows the listener to easily adjust the
relative levels of bass to highs, with the front to rear fade on the head unit.
Channels 1 and 2 will be used for highs, and channels 3 and 4 for mono bass.
Interconnect cable checklist:
- Use good quality RCA leads to connect the inputs of the amplifier to the source
as shown.
- Follow the instructions as per the previous system for switch and crossover
settings.
GN
D
RE
M
+1
2V
PO
W
ER
IN
PU
T
F
US
E
PO
W
ER
PR
OT
EC
T
CH
3
/4
S
PE
AK
ER
O
UT
PU
T
BR
ID
GE
D
RI
GH
T
LE
FT
-
+
-
+
RI
GH
T
LE
FT
-
+
-
+
CH
½
S
PE
AK
ER
O
UT
PU
T
BR
ID
GE
D
LIN
E IN
PU
T
LIN
E O
UT
PU
T
R
L
CH
3/4
C
H1
/2
CH
3
C
H4
CH
1
C
H2
CH
AN
NE
L 1
/ 2
CH
AN
NE
L 3
/ 4
+ -
gn
d -
+
+ -
gn
d -
+
HI I
NP
UT
5V
0
.2V
0
dB
1
2d
B
60
Hz
1
.2K
Hz
3
0H
z 2
50
Hz
LE
VE
L
B
AS
S E
Q
H
PF
L
PF
FU
LL
LP
F H
PF
X-O
VE
R
5V
0
.2V
0
dB
1
2d
B
60
Hz
1
.2K
Hz
3
0H
z 2
50
Hz
LE
VE
L
B
AS
S E
Q
H
PF
L
PF
FU
LL
LP
F H
PF
X-O
VE
R
CH
AN
NE
L
2
3
4
M
OD
E
GN
D
RE
M
+1
2V
PO
W
ER
IN
PU
T
F
US
E
PO
W
ER
PR
OT
EC
T
CH
3
/4
S
PE
AK
ER
O
UT
PU
T
BR
ID
GE
D
CH
½
S
PE
AK
ER
O
UT
PU
T
BR
ID
GE
D
LIN
E IN
PU
T
LIN
E O
UT
PU
T
R
L
CH
3/4
C
H1
/2
CH
3
C
H4
CH
1
C
H2
CH
AN
NE
L 1
/ 2
CH
AN
NE
L 3
/ 4
+ -
gn
d -
+
+ -
gn
d -
+
HI I
NP
UT
5V
0
.2V
0
dB
1
2d
B
60
Hz
1
.2K
Hz
3
0H
z 2
50
Hz
LE
VE
L
B
AS
S E
Q
H
PF
L
PF
FU
LL
LP
F H
PF
X-O
VE
R
5V
0
.2V
0
dB
1
2d
B
60
Hz
1
.2K
Hz
3
0H
z 2
50
Hz
LE
VE
L
B
AS
S E
Q
H
PF
L
PF
FU
LL
LP
F H
PF
X-O
VE
R
CH
AN
NE
L
2
3
4
M
OD
E
LEFT TO
CHANNELS
1 AND 3
RIGHT TO
CHANNELS
3 AND 4
FULL RANGE
STEREO LINE
INPUTS
STEREO
HIGHS
SPEAKERS
MONO
BASS
SPEAKER
REMOTE TURN-ON
CHASSIS GROUND
TO B 12 Volts VIA FUSE
STEREO
HIGHS
SPEAKERS
MONO
BASS
SPEAKER
REMOTE TURN-ON
CHASSIS GROUND
TO B 12 Volts VIA FUSE
RI
GH
T
LE
FT
-
+
-
+
RI
GH
T
LE
FT
-
+
-
+
