impact JK 902 User manual

MODEL:
OWNER’S
MANUAL
JK 902
RMS 90Wx2CH CLASS-AB AMPLIFIER
JK 904
JK 1300
RMS 90Wx4CH CLASS-AB AMPLIFIER
RMS 1300Wx1CH CLASS-D AMPLIFIER
Where You Headed?
Thank you for choosing IMPACT JK Series Amplifier! Your choice of IMPACT JK
Series Amplifier indicates a desire for high quality music reproduction in your
car. IMPACT JK Series Amplifier brings to you over four decades of car audio
expertise. So whether you are a daily driving music lover, or a serious car
audio competitor, IMPACT has the product for you!
To take full advantage of the IMPACT JK Series Amplifier gear you have just
purchased, please read and follow the instructions in this manual. As with all
of our products, professional installation by an authorized IMPACT dealer is
highly recommended! Otherwise, the performance of your new gear may
not be satisfactory.
You’re Headed in the Right Direction with IMPACT!
INTRODUCTION
The IMPACT JK Series Amplifier amplifiers offer high quality audio
reproduction for the audiophile and the everyday listener as well. All models
feature fully variable crossovers with 18 dB per octave slopes, allowing you
the ability to tailor the sound to best fit the speakers and your listening
preferences.
Platinum finish connections Ensures solid electrical connections that resist
corrosion.
Fully Variable Crossovers Fully variable crossovers promote easy
installation and save the cost of outboard crossovers. Additionally, they may
be used in conjunction with outboard passive or active crossovers,
depending on the complexity required by the system. The 18 dB per octave
slope offers steep roll-off above or below the selected frequency.
Protection Circuitry Against Overload, Short Circuit, Thermal, and Reverse
Polarity. These Protection features are designed to protect the amplifier from
misuse, as well as from common causes of amplifier failure.
INSTALLATION
Professional installation by an authorized IMPACT dealer is highly
recommended! Otherwise, the performance of your new gear may not be
satisfactory. In the event that you decide to do your own installation, please
read and follow this manual very carefully. Failure to do so may compromise
the integrity of this product, your automobile, and possibly void the product
warranty.
1

Speaker outputs
Some of these amplifiers are multi channel amplifier design. Meaning it has
more than one channel of speaker outputs. It is equipped with a large block
style terminal for speaker connection. Make this connection carefully and
neatly.
Strip your wire back and twist the exposed leads
and insert them into the block terminal while
being careful that there is no loose or frayed
strands of wire. Tighten the Allen head screw
down on the terminal till the wire is tightly
secured in place. If the wires ever come in
contact with each other the amplifier will go
into protection mode.
Know your total ohm load before you make any
connections.
3
Installation Instructions
1. Before you start, disconnect the negative cable from the car battery.
Tape up the end so it is isolated from the battery.
2. Run an appropriate gauge wire from the battery to the amplifier. Plan this
part of the installation carefully. This cable will carry very high current. If it
should short to the body and it is not properly fused it could catch fire.
3. Connect the power wire to the battery using a fuse capable of the
total current load of all amplifiers connected. Don't install the fuse yet.
Wait until the end. Locate the fuse as close as possible to the battery.
4. Find the closest clear metal area to the amp for a ground. Sand, grind or
scrape all paint and undercoating from the body and screw the ground
securely in place.
It is advisable to test the ground with an ohmmeter between the ground
cable and the negative battery cable to insure a good low resistance
connection. Some alloys used in modern cars do not offer the best ground.
If you believe this is the case consult with the vehicle manufacturer.
5. Run the speaker wire to the speakers. It is advised that you leave some
extra wire at this point. You can “clean it up”later.
6. If you haven't already done so, mount the amp now.
7. Connect the power and ground to the amplifier.
You should install the fuse at the battery only after this step .
FRONT
REAR
LR
BRIDGE
Amplifiers are generally mounted in the hatch/trunk area of a car or SUV, and
under or behind the seat of most pick up trucks. Select a location that will
provide adequate ventilation for the amplifier. Avoid mounting the amplifier
with the fins facing down. The fins should be facing up, either vertically or
horizontally. Secure the amplifier with the screws provided.
WARRANTY!
Before securing the amplifier, inspect the mounting location carefully to ensure
that you do not drill into or damage any electrical, hydraulic, fluid, or fuel lines.
2
Input Section
Because of the wide range of head unit output configurations all IMPACT
amplifiers have an adjustable input gain (sens). The gain is not a volume or a
power limiting control like a throttle. It makes the amp more sensitive to input
from the stereo. With the gain up the amp will reach full output at a lower
volume setting on the deck. At higher gain settings the amp also becomes more
sensitive to noise from the car's electrical system. Try to run the gain at the
lowest setting possible for your system.
There is no correct gain setting. As
speakers require different power
demands to reach the same output, the
gains most often need to be used to
compensate for these differences. If
you try to set all the gains at half way you
would probably find the system doesn't
sound very good. Using good judgment
and listening carefully to each speaker is
still the best way to tune a system.
Crossover controls
A crossover is a device that removes unwanted frequencies from a speaker or
amplifier. A tweeter can easily be destroyed by bass frequencies if they are
not filtered out. Likewise a subwoofer will not sound natural if it is playing
midrange notes. A crossover removes these sounds from the speaker as you
might guess.
Careful adjustment in needed to ensure
that all the speakers are playing the
right sounds and that you with have left
no “holes”or low spots in the
frequency response.
R
L
FRONT
REAR
INPUT
SENS
MIN MA X
LINE OUT
REAR
L
R
SENS
MAX
INPUT
FRONT
SENS
MIN MA X
X-OVER
FREQ
40Hz 4 00H z
L
R
X-OVER
LPFHPF FL AT
INPUT
FRONT

4
8. Connect the remote wire from the head unit to the amplifier. Now is a
good time to turn on the amp for the first time. Make sure it turns on properly
and does not go into protection mode.
9. Connect the speaker wires to the amp and speakers (make sure the amp is
off first). Make sure the polarity (+ / -) is correct.
10. Connect the RCA'S to the amp.
11. Double check the amplifier controls at this time. Make sure everything is
set correctly for your system.
12. Now you're ready to play it for the first time. It is best to leave the gain all
the way down at first. Start with the head unit volume low and work your
way up.
13. Now you can tune the amp. Take your time and make only one adjustment
at a time. It may take some time to get the system fully adjusted. During
this time the amp is drawing current from the battery. You should
check the battery voltage from time to time and re-charge it if it
gets low. that's it. You're done. Now have fun.
5
STEREO 2 CHANNEL HIGH PASS
jk 902
R
L
INPU T
LINE O UT
SENS
MIN M AX
X-OV ER
LPFHPF F LA T
X-OV ER
FREQ
40H z 40 0H z
BASS
BOOS T
0dB 1 8d B
POW ER
PRO TE CT
Use this
Crossove r
for HIGH
Set to
HPF or FLAT
LOW LEVEL
AUDIO
REMO TE G RO UN D
+12V
FUSE
RL
BRID GE
XOVER XOVER
FUSE AT BATTERY FOR
WIRE SH ORT PROT ECTI ON
FRO M
HEA DU NIT
MONO SUBWOOFER
R
L
INPU T
LINE O UT
SENS
MIN M AX
X-OV ER
LPFHPF F LA T
X-OV ER
FREQ
40H z 40 0H z
BASS
BOOS T
0dB 1 8d B
POW ER
PRO TE CT
Use this
Crossove r
for LOW
Set to
LPF
LOW LEVEL
AUDIO
Use this
Gain Contr ol to
BOOST BA SSES as needed
REMO TE G RO UN D
+12V
FUSE
RL
BRID GE
FUSE AT BATTERY FOR
WIRE SH ORT PROT ECTI ON
FRO M
HEA DU NIT

Use this
Crossove r
for BOOST as needed
XOVER
67
STEREO 4 CHANNEL HIGH PASS
jk 904
R
L
FRON T
REAR
INPU T
SENS
MIN M AX
X-OV ER
FREQ
40H z 40 0H z
LINE O UT
REAR
L
R
SENS
MIN M AX
X-OV ER
LPFHPF F LA T
X-OV ER
LPFHPF F LA T
X-OV ER
FREQ
40H z 40 0H z
POW ER
PRO TE CT
INPU T
FRON T
REAR
BASS
BOOS T
0dB 1 8d B
LOW LEVEL
AUDIO
Set to
HPF or
FLAT
Use this
Crossove r
for HIGH Set to
HPF or
FLAT
Use this
Crossove r
for HIGH
REMO TE G RO UN D
+12V
FRON T
REAR
LR
BRID GE
FUSE AT BATTERY FOR
WIRE SH ORT PROT ECTI ON
FRO M
HEA DU NIT
XOVER
XOVER
XOVER
STEREO HIGH PASS
With MONO SUBWOOFER
jk 904
R
L
FRON T
REAR
INPU T
SENS
MIN M AX
X-OV ER
FREQ
40H z 40 0H z
LINE O UT
REAR
L
R
SENS
MIN M AX
X-OV ER
LPFHPF F LA T
X-OV ER
LPFHPF F LA T
X-OV ER
FREQ
40H z 40 0H z
POW ER
PRO TE CT
INPU T
FRON T
REAR
BASS
BOOS T
0dB 1 8d B
LOW LEVEL
AUDIO
Set to
LPF
Use this
Crossove r
for LPF
Use this
Crossove r
for HIGH
REMO TE G RO UN D
+12V
FRON T
REAR
LR
BRID GE
FUSE AT BATTERY FOR
WIRE SH ORT PROT ECTI ON
FRO M
HEA DU NIT
XOVER
XOVER
Set to
HPF or
FLAT
Due to space problems the
FUSES are inside the circuit
so, if needed, please open the bottom
panel and replace them
Due to space problems the
FUSES are inside the circuit
so, if needed, please open the bottom
panel and replace them
Minimu m impedance 4 Ohm

89
1 OHM STABLE CLASS D
SUBWOOFER AMPLIFIER
jk 1300
Ad j u s t S ens
Ca r e f ully
POW ER
PRO TE CT
SENS
MIN M AX
BASS
0dB 1 8d B
LPF
30Hz 300Hz
SUBS ON IC
10Hz 55Hz
L
R
INPU T RE MO TE S PE AKER
BRID GE
SLA VE M AS TER
LOW LEVEL
AUDIO Set Bass
Boost
As N e e d ed
Use Thi s
Crosso ver
For Low
Ad j u s t
Su b s o n ic Filter
To Pr event
Woofer Damag e
Set to:M aster Mode
Use this
for Remote
Bass Boost
REMO TE G RO UN D
+12V
FUSE
FUSE AT BATTERY FOR
WIRE SH ORT PROT ECTI ON
FRO M
HEA DU NIT
Master/Slave configuration
jk 1300
Connecting two JK 1300 in master/slave mode will double the output power,
Minimum speaker load is then 2 Ohms. Set the selector master for one JK 1300
and slave for another JK 1300. Connect the 2 amps through the data link cable
into the «bridge» plugs. Connect input signal and set all filters to MASTER amp
only.
Warning: Minimum speaker impedance is 2 Ohms.
POW ER
PRO TE CT
SENS
MIN M AX
BASS
0dB 1 8d B
LPF
30H z 30 0H z
SUBS ON IC
10Hz 55Hz
L
R
INPU T RE MO TE S PE AKER
BRID GE
SLA VE M AS TER
POW ER
PRO TE CT
SENS
MIN M AX
BASS
0dB 1 8d B
LPF
30H z 30 0H z
SUBS ON IC
10Hz 55Hz
L
R
INPU T RE MO TE S PE AKER
BRID GE
SLA VE M AS TER
Min 2 O HM

10
SPECIFICATIONS
Should your amplifier require service Please contact IMPACT CAR
AUDIO Local Dealer that will manage to send it back to us for repairing.
WARRANTY
POWER OUTPUT AT 4 Ω
POWER OUTPUT AT 2 Ω
POWER OUTPUT AT 4 Ω BRIDGED
TOTAL HARMONIC DISTORTION
S/N RATIO REF 1W AT 4Ω
GAIN RANGE
CROSSOVER RANGE
FREQUENCY RANGE
LINE OUT
MODEL NO.
REMOTE BASS CONTROL
FUSE
JK 902
90x2CH 90x4CH 600x1CH
130x2CH 130x4CH 900x1CH
260x1CH 260x2CH
1300x1CH
<0.1% <0.1% <0.1%
>95dB >95dB >95dB
0.2V-8V 0.2V-8V 0.2V-8V
40-400Hz 40-400Hz 30-300Hz
20-20KHz 20-20KHz 20-300 Hz
YES YES N/A
YES
30Ax1
JK 904 JK 1300
N/A
N/A
30Ax2 40Ax3
DIMENSIONS(MM) 244Lx180Wx50H 344Lx180Wx50H 404Lx180Wx50H
POWER OUTPUT AT 1 Ω
IMPACT CAR AUDIO
Via dell’Industria, 28 - 42025 Corte Tegge - Cavriago
(RE) - Italy
Tel. [phone] - Fax [phone]
www.impact-car-audio.com
E-mail: [email protected]
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