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Controls
1 234
5
Operations of the following control and switches
are required in accordance with the center unit
and speakers connected with this unit.
1 Fuse
15 A × 1
2 Battery terminal
3 Ground terminal
4 Power control (REMOTE) terminal
5 SPEAKER OUTPUT terminals
• Stereo Connections:
When you wish to use the unit as a stereo
amplifier, stereo connections are used.
• Bridged Connections:
When you wish to use the unit as a high-output
monaural amplifier, bridged connections are
used. (Make connections to the LEFT channel (+)
and the RIGHT channel (–) SPEAKER OUTPUT
terminals.)
System examples
■ 2-channel system
CENTER
L
L
UNIT
Right speaker
R
R
8
7
OPERATION
FILTER
STEREO
MONO(Lch)
OFF
LPF
■ Subwoofer system
CENTER
Left speaker
UNIT
Right speaker
L
L
R
R
7
8
OPERATION
FILTER
STEREO
MONO(Lch)
OFF
LPF
■ High-power 2-channel system
L
L
L
CENTER
R
R
UNIT
L
L
R
R
R
8
7
OPERATION
FILTER
STEREO
MONO(Lch)
OFF
LPF
■ Tri-mode
L
High pass
C
L
L
CENTER
UNIT
R
R
C
7
8
OPERATION
FILTER
STEREO
MONO(Lch)
OFF
LPF
Principle of Tri-mode
Method of frequency band division using a coil
and capacitor
...
in case of 6dB/oct. slope
Coil (L): Passes low frequencies and blocks
high frequencies. (Low pass)
Capacitor (C): Passes high frequencies and
blocks low frequencies. (High pass)
Example:
When it is required to set a crossover
frequency of 120 Hz using speakers with an
impedance of 4 ohms.
fc=Cut of Frequency (Hz)
R=Speaker Impedance (Ω)
6
7
89
6 RCA cable ground lead terminal
When using an RCA cable with a ground lead
attached, connect the ground lead to this terminal.
2CAUTION
Do not use this terminal for power source
grounding. This unit will be damaged if the power
source grounding wire is connected to this
terminal.
7 FILTER switch
These switches allow filtering of the speaker
output signals.
• LPF (Low Pass Filter) position
Only frequencies of 80 Hz or lower are output.
(Frequencies above 80 Hz are cut.)
The Lch and Rch will be mixed before output
even if the operation switch is set to STEREO.
• OFF position
The original sound without filtering is output.
Connection
NOTE
■ RCA cable connection
Left speaker
CENTER UNIT (CD receiver, etc.)
6
Subwoofer
(Bridged)
■ Speaker stereo connection
Left speaker
(Bridged)
Right speaker
(Bridged)
5
Crossover Frequency
0 dB
Subwoofer
-3 dB
(L + R)
L
159000
159000
C=
(µF)
=
fc x R
120Hz x 4Ω
159 x R
159 x 4Ω
L=
(mH)
=
fc
120Hz
2CAUTION
• If you wish to bridge-connect a speaker, the
speaker impedance must be no less than 4
ohms. Connecting a speaker with an
impedance lower than 4 ohms may damage
the unit.
• Be sure to connect capacitors to speakers to
which high frequencies will be passed.
Failure to do so will result in a drop of the
combined impedance with the subwoofer.
• Ensure that the withstand voltage and
current ratings of the capacitors (C) and coils
(L) are sufficient.
9
0
!
8 OPERATION switch
This switch allows selection of the amplification
method of input signals.
• STEREO position
The amplifier can be used as a stereo amplifier.
• MONO (Lch) position
Amplifies the signal input from the left side only.
Set to this position and make bridged
connections to use as a high-power monaural
amplifier. (The input right signal is not output.)
9 INPUT SENSITIVITY control
Set this control according to the pre-output level of
the center unit connected with this unit, or to the
maximum power output of the genuine-accessory
car stereo.
Use the diagram on the right as a guide.
NOTE
For the pre-output level or the maximum power
output, refer to the <Specifications> in the
instruction manual of the center unit.
0 LINE IN terminal
! Speaker level input terminals
For safe installation, read <Installation procedure> before starting work.
RCA cable*
Power control wire*
4
Lead terminal*
H T
R IG
E D
ID G
B R
F T
L E
Left speaker
■ Power wire connection
C
Frequency
= 331.25 µF
= 5.3 mH
Battery wire*
Protective Fuse*
Ø4.6
0.5
0.3
10
1.0
15
20
MIN
MAX
(W)
INPUT
SENSITIVITY(V)
25W or greater
Protection function
This unit is equipped with a protection function for
protecting this unit and your speakers from various
accidents or problems that can occur.
■ The protection function is activated
■ Speaker level input connection
Genuine-accessory car stereo
(No line output center unit etc.)
Car fuse box
Battery
!
T
P U
IN
H T
L
V E
R IG
L E
E R
K
E A
S P
F T
L E
■ Speaker bridge connection
Lead terminal*
5
H T
R IG
E D
ID G
B R
F T
L E
Right speaker
2
3
4
Lead terminal*
Terminal cover
Power control wire*
Ground wire*
Battery
250 mm
237 mm
in the following situations:
• When a speaker wire may be short-circuited.
• When a speaker output contacts ground.
• When the unit malfunctions and a DC signal is
sent to the speaker output.
• When the internal temperature is high and unit
won't operate.
• When a ground wire of the center unit (cassette
receiver, CD receiver, etc.) or this unit is not
connected to a metal part serving as an electrical
ground passing electricity to the battery's
negative - terminal.
*Commercially available parts
Right speaker
Left speaker
ACC
4
Speaker
(Bridged)
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