impact LK 602 User manual

LK
Mosfet Amplifiers
LK 602
LK 902
O W N E R ‘ S M A N U A L
LK 454
LK 654

S/N Ratio
Low Pass Crossover (Variable)
Bass Boost (Variable)
Frequency Response
THD@ RMS Output
Fuse Values
Power Max (2 Ohms)
Remote Subwoofer Level Control
LK 602
175W x 2
110W x 2
350W x 1
Power RMS (4 Ohms)
Bridged (4 Ohms) Power
High Pass Crossover
Continuously Variable 35Hz ~ 155Hz
Tri-mode Operation
Inputs
LK 902
300W x 2
200W x 2
600W x 1
LK 454
125W x 4
75W x 4
250W x 2
LK 654
150W x 4
100W x 4
300W x 2
9Hz - 50KHz (+/- 3dB)
100Hz 100Hz 100Hz 100Hz
25A x 1
- - - - - - - - - - - -
(11-7/8"W x 2-7/8"H x ...) 16-5/8"L13-3/16"L14-11/16"L10-3/8"L
MODEL
Channnel Separation
Damping Factor
Full range pre-amp output
Dimensions
0~ +18dB 0~ +18dB 0~ +18dB
0~ +18dB
YES YES YES YES
YES YES YES
YES
0.01%
90dB
125+
103 dB 103 dB 103 dB 103 dB
0.01% 0.01% 0.01%
90dB 90dB 90dB
125+ 125+ 125+
15A x 1 15A x 1 30A x 2
YES YES
FEATURES
Heavy Duty Aluminum Alloy Heatsink
Class A-B Operation
Continuously Variable Low Pass Crossover
(35Hz to 155Hz)
18dB Bass Boost
Remote Subwoofer Level Control
High Pass Crossover (100Hz)
Two Channel Amplifiers LK 602 , LK 902
Two Channel BridgeableMOSFET Amplifier
Tri-Mode Capable
Heavy Duty AluminumAlloy Heatsink
Class A-B Operation
Continuously VariableLow PassCrossover
(35Hz to 155Hz)
18dB Bass Boost
Remote Subwoofer LevelControl
High PassCrossover (100Hz)
Continuously VariableInput Gain Control
Nickel Plated RCAAnd Speaker LevelInputs
Remote Turn On /Turn Off Circuit
MOSFET Pulse WidthModulated PowerSupply
2 Ohm StableStereo Operation WithOutput
Power Increase
Soft Turn-on Circuit
Thermal and SpeakerShort Protection Circuitry
LED PowerAnd Protection Indicators
Four Channel Amplifiers LK 454, LK 654
Four Channel BridgeableMOSFET Amplifier
The amplifier protection circuitry will disable the amplifier if the inputs are overloaded, short-circuited or
extremely high temperature conditions are detected. When the protection mode is in operation, the LED indicator
on the front panel will be illuminated, indicating the amplifier has gone into a self-preservation mode.
Attempting to powerup the amplifieragain.
If you observe that the protection LED is lit, please check the system carefully to determine what has caused the
protection circuit to engage. The amplifier can be reset by turning the remote power off and then on again. If the
amplifier shuts down due to a thermal overload condition, please allow it to cool down before powering up. If the
amplifier shuts down because of an input overload or short circuit, Be sure to repaire these conditions before
The IMPACTLK series amplifiersfeature built-in electroniccrossovers.
The 2 Channel amplifiers feature a continuously variable low pass and high pass crossover.
The 4 Channel amplifiers feature a pair of continuously variable low pass and high pass crossovers.
Built-in Crossover
The IMPACT LK series amplifiers have been designed with 100% MOSFET power supplies, ensuring
extremely quick switching response for plenty of clean power.
Protection Circuitry
SPECIFICATIONS
Continuously VariableInput Gain Control
Nickel Plated RCAAnd Speaker LevelInputs
Remote Turn On /Turn Off Circuit
MOSFET Pulse WidthModulated PowerSupply
2 Ohm StableStereo Operation WithOutput
Power Increase
Soft Turn-on Circuit
Thermal and SpeakerShort ProtectionCircuitry
LED PowerAnd ProtectionIndicators
Electrical Wiring
The protection circuitto engage.
The IMPACT LK Series amplifier was designed tooperate effectively at loads down 2 Ohms.This
means that you can install four 8Ohm speakers per channel when using parallel wiring. Increasing
the number of woofers per channel at lowfrequencies (up to 100Hz) produces an acoustic
coupling effect. This acoustic coupling increases your power output by 3 dB per speaker.
When operating at 2Ohms, the amplifiers will increase their output power by approximately 50%. The
current draw will also increase by about the sameamount, so be sure youhave enough current torun the
amplifiers into a 2 Ohmload. If you lack adequate current, your music reproduction will be distorted.
Please note: The gain control ofany car audio amplifier should notbe mistaken for avolume control. It is
a sophisticated device, designed to matchthe output level of your audiosource unit to theinput level of
the amplifier. Do not adjustthis input level to maximum unlessyour input level requiresit. Ignoring these
instructions will result in an inputoverload to the amplifier, and excessive audio distortion. Itcan also cause
2 Ohm Operation (in stereo mode)
Wire the amplifier directly to the carbattery.Make sure there is circuit protection (such as a fuse) onthe
Positive power lead,within 18 inches of the battery.
All IMPACT LK series power amplifiers are equipped with easy top access screw terminals. These
terminals are n in order to ensure excellent electrical contact and to resist corrosion.ickel-plated
When making electrical connections tothe amplifier, please observe the following:
Use at least 8 gauge orheavier wire for power and ground connections.
For the ground connection, usethe shortest possible wire to a good chassis ground point.
Wire the Remote connection to the remoteturn-on lead of yourequalizer or head unit.In some cases
this may be the power antennalead of the head unit.
Fuses
Fuses protect both the amplifier and the electrical system of your vehicle from faulty conditions. If you must
replace the fuse in your ampliifier, use a fuse of exactly the same type and rating. A different type or rating may
result in damage or cause afire.
-2- -3-

Power
Low Pass
CH 1/2 Crossover
High
Pass Freq Level
40
35
145
155
Min
160
100
Max
High Inputs CH 1
CH 2
CH 3
CH 4
CH 1
CH 2
CH 3
CH 4
CH 3/4 Crossover
Low Pass High
Pass
Freq
Level
Full
40
35
145
155
160
100
Min Max 0 + 18 dB
Bass
Protect
Full
Remote
Boost
Crossover
Low Pass High
Pass
FreqLevel
40
35
145
155
160
100
Min Max 0 + 18 dB
Bass
Protect
Full
Remote
Boost
Power
High Inputs
Low Inputs
Pre outputs
RL LR
Power
Low Pass
CH 1/2 Crossover
High
Pass Freq Level
40
35
145
155
Min
160
100
Max
High Inputs CH 1
CH 2
CH 3
CH 4
CH 1
CH 2
CH 3
CH 4
CH 3/4 Crossover
Low Pass High
Pass
Freq
Level
Full
40
35
145
155
160
100
Min Max 0 + 18 dB
Bass
Protect
Full
Remote
Boost
Crossover
Low Pass High
Pass
FreqLevel
40
35
145
155
160
100
Min Max 0 + 18 dB
Bass
Protect
Full
Remote
Boost
Power
High Inputs
Low Inputs
Pre outputs
RL LR
High LevelInputs
If the HIGH LEVEL INPUTS are used, do not use the LOW LEVEL RCA inputs at the same time.
The IMPACT LK series 2-Channel amplifiers use ONE High Level Input for both channels and the
The IMPACT LK Series 4-Channel amplifiers use TWO of these connectors-one for each pair of
channels.
HEAD UNIT
From HEAD
UNIT
SPEAKER
OUTPUT
LEFT CHANNEL( +)
LEFT CHANNEL( -)
CHASSIS GROUND
RIGHT CHANNEL (-)
RIGHT CHANNEL (+)
Four Channel Amplifiers:
Two Channel Amplifiers :
CHANNEL 4 (+)
CHANNEL 4 (-)
CHASSIS GROUND
CHANNEL 3 (-)
CHANNEL 3 (+)
HEAD UNIT
From HEAD
UNIT
SPEAKER
OUTPUT
CHANNEL 1 (+)
CHANNEL 1 (-)
CHASSIS GROUND
CHANNEL 2 (-)
CHANNEL 2 (+)
FRONT
INPUTS
REAR
INPUTS
LEFT
INPUT
RIGHT
INPUT
From OUTPUT
of HEAD UNIT
Low Level Input Wiring
Two Channel Amplifiers
Four Channel Amplifiers
From OUTPUT
of HEAD UNIT
Mounting the Amplifier
Mark the location for themounting screw holes bypositioning the amplifier where youwish to install itand
use a scribe (or oneof the mounting screws) inserted in each mounting hole to mark the mounting surface.
If the mounting surface is carpeted,measure the hole centers and mark with a felt tip pen.
Drill pilot holes in the mounting surface for the mounting screws and insert the mounting screws into these
holes. Tighten them securely.
Note: Before beginningyour installation, besure to takenote of anywires, lines orother devices inyour
vehicle which maybe located behindany mounting surface.
-4- -5-

To REMOTE TURN-ON
from HEAD UNIT
GROUND
To BATTERY
To REMOTE TURN-ON
from HEAD UNIT
GROUND
To BATTERY
To REMOTE TURN-ON
from HEAD UNIT
GROUND
To BATTERY
Power
Batt Rem Gnd
Fuse
Bridged
Speakers
Left Right
Power
Batt Rem Gnd
Fuse
Bridged
Speakers
Left Right
Connect the NEGATIVE SPEAKER TERMINALto the
LEFT CHANNEL NEGATIVE AMPLIFIER TERMINAL.
Connect the POSITIVESPEAKER TERMINAL tothe
RIGHT CHANNEL POSITIVEAMPLIFIER TERMINAL.
Bridged Speaker Wiring
Two Channel Speaker Wiring
++
++
LEFT
SPEAKER
RIGHT
SPEAKER
Two Channel Amplifiers
Two Channel Amplifiers
Full Range
Speakers
++
SUBWOOFER MINIMUM
IMPEDANCE 8 OHMS!
++
++
HIGH PASS
FILTER (CAPACITORS)
SPEAKER IMPEDANCE
4 - 8 OHMS!
LOW PASS
FILTER (INDUCTOR)
Tri-Mode SpeakerWiring
Component ValuesComponent Values
for 6dB Passive Crossoverfor 6dB Passive Crossover
Frequency Inductor Capacitor
80Hz 7.5mH 470uF
100Hz 6.5mH 330uF
120Hz 5.5mH 330uF
150Hz 4mH 220uF
To engage the amplifier in this mode, place the Crossover (Subwoofer)
switch in the "FULL" position. Use a 100v non-polar capacitor for a high
pass crossover and a wire coil inductor to block high frequencies from
the subwoofer, as shown in the figure below. Please review the table below
for inductor and capactior component values to determine the desired
crossover frequencies.
Tri-Mode Operation is a uniquefeature which allows a two channel amplifier to drive a sub-woofer operated
in MONO mode, while simultaneously driving full range speakers in STEREO.
Power
Batt Rem Gnd
Fuse
Bridged
Speakers
Left Right
++
SPEAKER IMPEDANCE
4 - 8 OHMS!
-6- -7-

CH 1 CH 2 CH 3 CH 4
Bridged
Speakers Power
Batt Rem Gnd
Fuses
Bridged
CH 1 CH 2 CH 3 CH 4
Bridged
Speakers Power
Batt Rem Gnd
Fuses
Bridged
CH 1 CH 2 CH 3 CH 4
Bridged
Speakers Power
Batt Rem Gnd
Fuses
Bridged
Four ChannelSpeaker Wiring
Bridged Speaker Wiring
Four ChannelAmplifiers
Four ChannelAmplifiers
Ch1
SPEAKER
Ch2
SPEAKER
Ch3
SPEAKER
Ch4
SPEAKER
++
++
SUBWOOFER
SPEAKER
SUBWOOFER
SPEAKER
SPEAKER IMPEDANCE
4 - 8 OHMS!
SPEAKER IMPEDANCE
4 - 8 OHMS!
To REMOTE TURN-ON
from HEAD UNIT
++
++
SUBWOOFER
SPEAKER IMPEDANCE
4 - 8 OHMS!
SPEAKER IMPEDANCE
4 - 8 OHMS!
++++
CH 1
SPEAKER
CH 2
SPEAKER
SUBWOOFER MINIMUM
IMPEDANCE 8 OHMS!
HIGH PASS
FILTER (CAPACITORS)
LOW PASS
FILTER (INDUCTOR)
++++
HIGH PASS
FILTER (CAPACITORS)
LOW PASS
FILTER (INDUCTOR)
CH 3
SPEAKER
CH 4
SPEAKER
SUBWOOFER
SUBWOOFER MINIMUM
IMPEDANCE 8 OHMS!
desired crossover frequencies.
To REMOTE TURN-ON
from HEAD UNIT
GROUND
To BATTERY
To REMOTE TURN-ON
from HEAD UNIT
GROUND
To BATTERY
Tri-Mode SpeakerWiring
Component ValuesComponent Values
for 6dB Passive Crossoverfor 6dB Passive Crossover
Frequency Inductor Capacitor
80Hz 7.5mH 470uF
100Hz 6.5mH 330uF
120Hz 5.5mH 330uF
150Hz 4mH 220uF
To engage the amplifier in this mode, place the Crossover (Subwoofer)
switch in the "FULL" position. Use a 100v non-polar capacitor for a high
pass crossover and a wire coil inductor to block high frequencies from
the subwoofer, as shown in the figure below. Please review the table below
for inductor and capactior component values to determine the desired
crossover frequencies.
Tri-Mode Operation is a uniquefeature which allows a two channel amplifier to drive a sub-woofer operated
in MONO mode, while simultaneously driving full range speakers in STEREO.
To BATTERY
-8- -9-

Confirm that allterminal strip connectionsare secure andtight.
Check both in-lineand built-in fuses.Both the "+12V"and the "REMOTE"terminals must
have +12V referencedto chassis ground.
Check the "BALANCE" control on thehead unit (or othersource) to verify that itis set to
its midpoint.
If you are using the LowLevel RCA Inputs, reverse the input plugs at the amplifier
(switches the R with the L). Ifthe channel which is silent switchesto other side,
the problem is either in the head unit/other source or the connecting tables.
If the noise is a "whine" whose pitch follows the engine speed, confirm that the
amplifier and any other signal sources ( head unit, etc.) are properly grounded.
If the noise is a"clicking" or "popping" noise whose rate follows the engine speed, this
usually means that the vehicle is equipped with resistor spark plugs and wires, or that
the ignition is in need of service.
Troubleshooting
Before removing youramplifier, refer to the list below and follow the suggested
procedures. Always testthe speakers and their wires first.
No Output
Confirm that the audio signal source (car radio, equalizer, etc.)is connected and issupplying
output signal. To check ifthe amplifier is supplying signal, unplug the RCAcables from the
signal source (but leave them plugged into the amp). Gently tap the center pinof each of
the disconnected RCA plugs with your finger.This should produce a noise (feedback) in
your speakers.
Only one
channel
works
Confirm that all speakerstrip connections are secure andtight.
Weak Output
Readjust theInput Sensitivity Control to better suit the input signal.
Noise in the
Audio
Check the routing of the speaker and input wires to make sure they are not adjacent to
wires which interconnect lights and other accessories.
Before you drillor cut anyholes, investigate yourcar's layout verycarefully.Takecare when youwork near
the gas tank,fuel lines, hydrauliclines and electricalwiring.
Do not operate the amplifierwhen it is notmounted. Attach all audio system components securely within
the automobile to prevent damage, especially incase of an accident.
Precautions
Do not mount this amplifier sothat the wire connections are unprotectedor in apinched condition, or likely
to be damaged by nearby objects.
Before making or breaking power connections in your system, disconnect the vehicle battery. Confirm that
your head unit or other equipment is turned off while connecting the input jacks and speaker terminals.
If you need to replace the power fuse, replace it only with a fuse identical to that supplied with the system. Using a fuse of
different type or rating may result in damage to your system which isn't covered by the manufacturer's warranty.
-10-
Crossover
LowPassHigh
Pass
Freq
Level
40
35
145
155
160
100
MinMax0+18dB
Bass
Protect
Full
Remote
Boost
Power
HighInputs
LowInputs
Preoutputs
R
LL
R
-11-
The amplifier isprovided with fourplastic mounting feetthat are tobe inserted inthe lower slotof the
chassis; please payattention that rightand left feetare different.
Mounting feet