21
Caution
Please avoid to connect speaker (-) to the ground or vehicle chassis.
3-Channel-Mode: 2 Speakers/Stereo & 1 Subwoofer / Mono bridged
Cable connection
• Connect the INPUT of the amplifier to the head unit line output with good quality RCA cables.
By connecting the RCA jacks OUTPUT with a additional amplifier, a full range signal will be
provided to the amplifier.
• Connect the speakers with the terminal block (CH1 +/- & CH2 +/ - SPEAKER OUTPUT and
the subwoofer with CH3/4 + BRIDGED - SPEAKER OUTPUT) of the amplifier.
• The minimum final speaker impedance must not be below 2 Ohm per channel and 4 Ohm
(Subwoofer) per channelpair. Too low speaker loads result in too high heat dissipation and
may cause the amplifier run into protection.
• Please observe speaker channel and polarity as printed by the speaker terminal block.
Incorrect phasing of the speakers results in total loss of bass response.
•
X-OVER Switch & Control (Front- or Rearspeakers on CH1/2)
•
See page 19.
X-OVER Switch & Control (Subwoofer on CH3/4)
•
See page 17.
INPUT LEVEL - Control (CH1/2 & CH3/4)
•
See page 19.
TWIN SUB - Switch CH1/2
•
The TWIN SUB - Switch must be set in this configuration to "OFF" - Position.
BASS BOOST - Control (Subwoofer on CH3/4)
• The BASS BOOST - Control adjusts the bass level at 45 Hz from 0dB up to 12dB.
Caution!
Please use the Bass-Boost carefully.
INPUT MODE - Switch
• The INPUT MODE - Switch must be in “2CH” - position (if LINE INPUT is occupied only on CH1/2) or to "4CH" - position (if LINE INPUT
is occupied on all four jacks).
CH
3
CH
3
LIN
E IN
PU
T
LIN
E IN
PU
T
O
UT
PU
T
O
UT
PU
T
LL
RR
LIN
E
LIN
E
BA
SS
R
EM
OT
E
BA
SS
R
EM
OT
E
CH
1
CH
1
CH
4
CH
4
CH
2
CH
2
PR
OT
EC
T
PR
OT
EC
T
PW
R
PW
R
BP
F
BP
F
4V4V
30H
z
30H
z
150
Hz
150
Hz
0d
B
0d
B
12d
B
12d
B
BA
SS
B O
OS
T
BA
SS
B O
OS
T
0.2
V
0.2
V
1.2
kH
z
1.2
kH
z
10H
z
10H
z
HIG
H P
AS
S
HIG
H P
AS
S
LO
W
P A
SS
LO
W
P A
SS
LE
VE
L I N
PU
T
LE
VE
L I N
PU
T
BP
F
BP
F
4V4V
30H
z
30H
z
150
Hz
150
Hz
0d
B
0d
B
12d
B
12d
B
0.2
V
0.2
V
1.2
kH
z
1.2
kH
z
10H
z
10H
z
4C
H
4C
H
2C
H
2C
H
INP
UT
INP
UT
MO
DE
MO
DE
OF
F
OF
F
ONON
TW
IN
TW
IN S
UB
SU
B
BA
SS
B O
OS
T
BA
SS
B O
OS
T
HIG
H P
AS
S
HIG
H P
AS
S
LO
W
P A
SS
LO
W
P A
SS
LE
VE
L I N
PU
T
LE
VE
L I N
PU
T
CH3 / CH4
CH3 / CH4
CH1 / CH2
CH1 / CH2
X- O
VE
R
X- O
VE
R
LP
/BP
LP
/BP
HPHP
FU
LL
FU
LL
X- O
VE
R
X- O
VE
R
LP
/BP
LP
/BP
HPHP
FU
LL
FU
LL
SP
EA
KE
R
O
TPU
UT
FU
SE
BR
I
ED
DG
L
R
GN
D
RE
M
12
V
OW
E
P
R
I
PN
UT
BR
ID
GE
D
L
R
Subwoofer
4 - 8 Ohm
Speakers 2 - 8 Ohm
BASS REMOTE
Connect RCA outputs from
head-unit with RCA inputs
(LINE INPUT CH1/2 and CH3/4).
4 Channel Amplifier - Speaker- & RCA-Connection
GTR440.4 – GTR640.4
