impact LK 602, LK 454, LK 902, LK Series, LK 654 Owner's Manual

LK

Mosfet Amplifiers

LK 602

LK 902

LK 454

LK 654

O W N E R ‘ S M A N U A L

FEATURES

Two Channel Amplifiers LK 602 , LK 902

Two Channel Bridgeable MOSFET Amplifier
Tri-Mode Capable
Heavy Duty Aluminum Alloy Heatsink
Class A-B Operation
Continuously Variable Low Pass Crossover
(35Hz to 155Hz)
18dB Bass Boost
Remote Subwoofer Level Control
Continuously Variable Input Gain Control

Four Channel Amplifiers LK 454, LK 654

Four Channel Bridgeable MOSFET Amplifier

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)

SPECIFICATIONS

MODEL

Power Max (2 Ohms)
Power RMS (4 Ohms)
Bridged (4 Ohms) Power

S/N Ratio

Low Pass Crossover (Variable)
High Pass Crossover
Bass Boost (Variable)

Tri-mode Operation
Inputs
Remote Subwoofer Level Control

Frequency Response
THD@ RMS Output
Channnel Separation
Damping Factor
Fuse Values

Full range pre-amp output
Dimensions

(11-7/8"W x 2-7/8"H x ...)

LK 602

175W x 2
110W x 2
350W x 1

103 dB

Continuously Variable 35Hz ~ 155Hz

100Hz

0~ +18dB

YES

YES

9Hz - 50KHz (+/- 3dB)

0.01%

90dB
125+

25A x 1

YES

High Pass Crossover (100Hz)
Nickel Plated RCA And Speaker Level Inputs
Remote Turn On / Turn Off Circuit

MOSFET Pulse Width Modulated Power Supply
2 Ohm Stable Stereo Operation With Output
Power Increase
Soft Turn-on Circuit

Thermal and Speaker Short Protection Circuitry

LED Power And Protection Indicators

Continuously Variable Input Gain Control
Nickel Plated RCA And Speaker Level Inputs
Remote Turn On / Turn Off Circuit
MOSFET Pulse Width Modulated Power Supply
2 Ohm Stable Stereo Operation With Output
Power Increase
Soft Turn-on Circuit
Thermal and Speaker Short Protection Circuitry
LED Power And Protection Indicators

LK 902

300W x 2
200W x 2

600W x 1

103 dB

100Hz 100Hz 100Hz

0~ +18dB

YES

YES

0.01%
90dB
125+

15A x 1

YES

LK 454

125W x 4
75W x 4
250W x 2

103 dB

0~ +18dB

YES

YES

0.01%
90dB

125+

15A x 1

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LK 654

150W x 4
100W x 4
300W x 2

103 dB

0~ +18dB

YES

YES

0.01%
90dB
125+

30A x 2

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Built-in Crossover

The IMPACT LK series amplifiers feature built-in electronic crossovers.
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.

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

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.

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
Attempting to power up the amplifier again.

2 Ohm Operation (in stereo mode)

The IMPACT LK Series amplifier was designed to operate effectively at loads down 2 Ohms.This

means that you can install four 8 Ohm speakers per channel when using parallel wiring. Increasing
the number of woofers per channel at low frequencies (up to 100Hz) produces an acoustic
coupling effect. This acoustic coupling increases your power output by 3 dB per speaker.

When operating at 2 Ohms, the amplifiers will increase their output power by approximately 50%. The
current draw will also increase by about the same amount, so be sure you have enough current to run the

amplifiers into a 2 Ohm load. If you lack adequate current, your music reproduction will be distorted.

Please note: The gain control of any car audio amplifier should not be mistaken for a volume control. It is
a sophisticated device, designed to match the output level of your audio source unit to the input level of
the amplifier. Do not adjust this input level to maximum unless your input level requires it. Ignoring these
instructions will result in an input overload to the amplifier, and excessive audio distortion. It can also cause
The protection circuit to engage.

Electrical Wiring

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 to the amplifier, please observe the following:

Use at least 8 gauge or heavier wire for power and ground connections.
Wire the amplifier directly to the car battery. Make sure there is circuit protection (such as a fuse) on the

Positive power lead, within 18 inches of the battery.

For the ground connection, use the shortest possible wire to a good chassis ground point.
Wire the Remote connection to the remote turn-on lead of your equalizer or head unit. In some cases

this may be the power antenna lead 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 a fire.

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