JVC KS-AX204 User manual

English
2CAUTION
This unit is designed to operate on 12 V DC, NEGATIVE ground
electrical systems. JVC recommends consulting a qualified technician
for installation.
• To prevent short circuits while making connections, keep the
battery’s negative terminal disconnected.
• This unit uses BTL (Balanced Transformerless) amplifier circuitry,
i.e., floating ground system, so comply with the following:
– Do not connect the “·” terminals of the speakers to each other.
– Do not connect the “·” terminals of the speakers to the metal
body or chassis.
• Cover the unused leads with insulating tape to prevent them from
short circuiting.
• If the fuse blows, first make sure the wires aren’t touching to cause
a short circuit then replace the old fuse with one with the same
rating.
• This unit becomes very hot. Be careful not to touch the unit not
only when using but after using. DO NOT disassemble the unit
since there are no user serviceable parts inside.
• To keep the heat dissipation mechanism running effectively, wipe
the accumulated dust off periodically.
• Do not let pebbles, sand or metallic objects get inside the unit.
• Listening to the tape, radio, CD or digital audio player, etc. with
the volume set at a high level for a long period of time will exhaust
the battery, while the engine is turned off or while the engine is
idling.
• Use the speakers which have sufficient capacity to the unit.
KS-AX204
LVT2505-001A [K] POWER AMPLIFIER: INSTRUCTION MANUAL
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English
INSTALLATION
The illustration above shows a typical installation. However, you
should make adjustments corresponding to your specific car.
Location of the unit
• Mount this unit on a firm surface, such as in the trunk or under the
front seat.
• When mounting the unit under the front seat, make sure that
adjusting the seat position will not catch any wire of the unit.
• Since heat is generated in the unit, do not mount it near
inflammable objects.
• Do not mount the unit in the places subject to heat: near a
radiator, in a glove compartment or in insulated areas such as
under a car mat that will prevent the unit from dissipating heat.
1Under the front seat
2Onto the trunk floor
Install the unit
• When mounting this unit, be sure to use the provided screws.
• If any other screws are used, there is a risk of loosening the unit or
damaging the parts under the car floor.
• Before drilling holes in the trunk to install the unit, make sure that
there is a sufficient space under the trunk so that you do not drill
holes in the fuel tank, etc.
3Provided screw Ø 4 × 20 mm (13/16 in.)
4Drilled hole
INSTALLATION

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TERMINAL CONNECTION
Use ring terminals (not provided) for secure connection.
POWER SUPPLY CONNECTION
The proper lead wire connected to each POWER terminal is as
follows.
• + B and GND: AWG 8 to AWG 4
(The cross section is about 8 mm2to 21 mm2.)
• REM: AWG 18 to AWG 8
(The cross section is about 0.8 mm2to 8 mm2.)
¡Connect to metallic body or chassis.
™-aWhen you use JVC car receiver with REMOTE OUTPUT, connect
to REMOTE OUTPUT.
™-bWhen you use a unit without REMOTE OUTPUT, connect to the
accessory circuit of the car which is activated by the ignition
switch. In this case, noise may occur when the car receiver is
turned on or off. To avoid this noise, do not turn on or off the
car receiver itself. You can turn on or off the car receiver along
with the on/off operation of the ignition switch.
£After all connections have been made, connect to the battery
12 V.
– Be sure to place the fuse near the battery as shown.
4 Car battery
5 Ignition switch
6 JVC car receiver, etc.
* Not supplied
TERMINAL CONNECTION POWER SUPPLY CONNECTION
English
AUDIO INPUT CONNECTION
When your receiver is equipped with line output.
1 JVC car receiver, etc.
2 Line out (Front)
3 Line out (Rear)/ Subwoofer
*1 Not supplied
When your receiver is NOT equipped with line output.
White “FRONT LEFT (+)” Black “RECEIVER GND”
Green “REAR LEFT (+)”Gray “FRONT RIGHT (+)”
Black “RECEIVER GND” Purple “REAR RIGHT (+)”
4 JVC car receiver, etc.
*2 Example: connecting to the ground
*3 Rear ground terminal
SPEAKER CONNECTIONS
The proper lead connected to each SPEAKER OUTPUT terminal is AWG
18 to AWG 12. (The cross section is about 0.8 mm2to 3.3 mm2.)
4-speaker system—Normal Mode
• Use the speakers with an impedance of 2 Ω to 8 Ω.
1Right Front 2Left Front
3Right Rear 4Left Rear
2-speaker system plus subwoofer—Bridge Mode
• Use the speakers with an impedance of 2 Ω to 8 Ω.
• Use the subwoofer with an impedance of 4 Ω to 8 Ω.
5Right Front 6Left Front
7Subwoofer
AUDIO INPUT CONNECTION SPEAKER CONNECTIONS
2
3
2

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CONTROLS
1POWER indicator
The green lamp lights while the unit is turned on.
2CROSSOVER filter switch
OFF:
Normally set to this position.
LPF:
Set to this position when you want to turn on the LPF (Low-Pass
Filter) switch. The Low Pass Filter transmits frequencies lower than
80 Hz.
HPF:
Set to this position when you want to turn on the HPF (High-Pass
Filter) switch. The High-Pass Filter transmits frequencies higher than
150 Hz.
3INPUT SENS. (input sensitivity) controller
Set this control according to the line-output level of the center
unit connected with this unit. For the line-output level, refer to the
“SPECIFICATIONS” in the instruction manual of the center unit. This
controller is preset to 5 V when the unit is shipped.
CONTROLS
3
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TROUBLESHOOTING
The POWER indicator does not light.
• Change the fuses if the current one is blown.
• Connect the ground lead securely to a metal part of the car.
• Confirm the battery voltage (11 V to 16 V).
• Leave the unit turned off to cool it down if it heats up abnormally.
No sound is heard.
• Confirm the connections for the power supply. (See “POWER
SUPPLY CONNECTION”.)
• Connect the RCA pin cords to the INPUT jacks, or the speaker input
connector to the HIGH INPUT terminal.
• Confirm the speaker wirings and the position of the CROSSOVER
filter switch. (See “SPEAKER CONNECTIONS”.)
Alternator noise is heard.
• Keep the leads of the POWER terminals away from the RCA pin
cords.
• Keep the RCA pin cords away from other electrical cables in the
car.
• Connect the ground lead securely to a metal part of the car.
• Make sure the speaker negative leads do not touch the car chassis.
• Connect a bypass capacitor across the accessory switches (horn,
fan, etc.).
Noise is made when you connect the unit to an
AM (MW/LW) tuner.
• Move all the leads of this unit away from the antenna (aerial) lead.
TROUBLESHOOTING
English
SPECIFICATIONS
Power Output
Normal Mode: 40 W RMS × 4 channels at 4 Ω and
≤ 1% THD + N
Signal-to-Noise Ratio: 80 dBA (reference: 1W into 4 Ω)
Power Output
Normal Mode: 60 W RMS × 4 channels at 2 Ω and ≤ 1% THD + N
Bridge Mode: 120 W RMS × 2 channels at 4 Ω and ≤ 1% THD + N
Maximum Power Output
600W
Load Impedance
Normal Mode: 4 Ω (2 Ω to 8 Ω allowance)
Bridge Mode: 4 Ω (4 Ω to 8 Ω allowance)
Frequency Response
5 Hz to 50,000 Hz ( +0 dB, –3 dB)
Input Sensitivity/Impedance
2 V/21 kΩ (0.2V to 5V, variable)
Distortion
Less than 0.06% (at 1 kHz)
Power Requirement
DC 14.4 V (11V to 16V allowance)
Grounding system
Negative ground
Dimensions (W×H×D)
300 mm × 49.5 mm × 185 mm
(11-13/16 in. × 2 in. × 7-5/16 in.)
Mass (approx.)
1.9 kg (4.2 lbs)
Accessories
Speaker input connector 3P × 2
Mounting Screw Ø 4 × 20 mm (13/16 in.) × 4
Design and specifications are subject to change without notice.
SPECIFICATIONS
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