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Features
Low Impedance Operation Class A/B stable into 2 ohm stereo
or 4 ohm mono loads.
Remote Bass Level Control Dash or center console mountable
for remote fine-tuning of bass output.
SORT Protection Circuitry (Short circuit, Over-voltage, Reverse
polarity, Thermal) Protects amplifier from accidents and
undesirable operation.
EndKaps Cast aluminum, custom, removable covers to
protect and hide all your wiring connections to the amplifier.
Can be prepped and painted any custom color you choose.
MOSFET Power Supply Provides high efficiency operation.
Two Year Warranty When purchased from an Authorized
KICKER Dealer.
KickBass Variable bass boost circuit which provides up to 18dB
of boost at 40Hz.
Built-In Variable Crossover 12dB selectable High pass or Low
pass variable from 50-200Hz. User defeatable for full range
operation.
High & Low level inputs Allows connection to various sources
such as: after-market stereo, factory radio, DVD Player, Video
Cassette Player, etc.
PAST (PRE Amp Signal Transfer) Output RCA jacks to pass the
incoming signal to another amplifier or component.
Custom tooled gold plated connectors Assure maximum
power transfer and clamping.
SAMS (Stereo And Mono Simultaneously) Amplifiers will
operate into a bridged mono load and a stereo load at the same
time.
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KX AMPLIFIERS
3
Mounting
Remember the controls on top of the amplifier will need to be
accessible for adjustment. Keep this in mind as you choose your
amplifier’s mounting location.
When selecting a location to mount your Kicker amplifier be
sure it is structurally sound and that there are no items behind
the area where the screws will be driven that could be damaged.
Check for wire harnesses, brake lines, fuel lines, gas tanks, etc.
Now that you are ready to mount your amplifier, use the
supplied 3mm allen wrench to remove the amplifier EndKap. This
will give you access to the mounting holes in the amplifier and all
wiring connections.
All amplifiers generate heat under normal operation. Be sure to
choose a location that allows adequate ventilation for the
amplifier. Also consider that the air temperature inside an
automobile’s luggage compartment can reach upwards of 140°
Fahrenheit (60° Celsius). An amplifier mounted here may require
additional cooling tactics such as fans or venting ducts to the
passenger compartment to allow cool operation. If possible,
mount the amplifier in the climate-controlled passenger
compartment.
With the EndKap removed, drill four holes using a 7/64”
(11mm) drill bit and use the supplied #8 screws to mount the
amplifier.
Remove
Remove
Use supplied #8 Mounting Screws
Remove
Remove
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KX AMPLIFIERS
4
Wiring
The ground should be connected to the amplifier first before
making any of the other connections. This wire should be as
short as possible (24 inches or less) and connected to a paint-
and corrosion-free solid metal area of the car’s chassis. Use the
same gauge wire as recommended for the amplifier’s power
connection to the battery. Adding an additional ground wire
between the car battery’s negative post and the car chassis of
this same gauge (or larger) is also recommended.
Signal can be input into the amplifier using either the low level
RCA input connections or the high level (speaker level) input
connections. Using the low level RCA connections is the
preferred method. Use the high level inputs only if your source
unit does not have low level RCA type outputs. Connecting to the
amp with either input connection will provide a low level signal at
the output (PAST) RCA jacks.
If you ever need to remove the amplifier from the vehicle after
it has been installed, the ground wire should be the last wire
disconnected from the amplifier--just the opposite as when you
installed it.
Speaker
Outputs
Left +
Left -
SOURCE UNIT
Right -
Right +
A fuse must be installed within 18 inches of the battery to
protect the power wire feeding your amplifier. This fuse should be
of at least the same value used in the amplifier but no higher
than the capacity of the wire. See the chart below for wire size
and fusing recommendations.
WARNING-Use Only One...Never Both At The Same Time !!!
RCA
Outputs
Model
Fuse Size Wire Size
The use of twisted pair interconnects is recommended for all
installations to minimize noise. When routing these cables
through the automobile, try to keep them away from factory
wiring harnesses and other power wiring. If you need to cross
any of this wiring do so at a 90 degree angle to reduce the
potential of alternator noise and electrical interference.
KX350.2
KX450.2
KX550.2
KX850.2
50A
60A
8 GA
4 GA
4 GA
2 GA
70A
120A
When working with power connections it is always
recommended that you disconnect the battery to prevent
accidents.
Note: To get the best performance from your new Kicker Amplifier,
we recommend using genuine Kicker Accessories and Wiring.
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5
KX AMPLIFIERS
USING THE SIGNAL OUTPUT JACKS (PAST)
Remote Bass Level
The Output (Pre Amp Signal Transfer) RCA jacks allow you to
send the incoming signal from one Kicker KX series amplifier to
another amplifier or processor without the need for Y cables. The
signal from the PAST jacks is identical to the signal fed to the
amplifier via its RCA input jacks or the High Level inputs and is
not affected by the amplifier’s built in crossover.
When the crossover on your KX series amplifier is set to LOW
PASS, you have the ability to control the output level of the
amplifier from the driver’s seat using the supplied Remote Bass
Level Control.
To mount the controller simply screw the metal bracket to the
chosen location, then slide the housing onto the bracket until it
snaps into place.
Most head units with high voltage outputs should be
capable of driving up to ten amplifiers in a chain.
WARNING - Use either the Hi-Level or RCA Inputs. Never Both !!
Run the cable from the controller to the “Remote Bass” jack on
the amplifier chassis.
Speaker
Outputs
Left +
Left -
Right -
Right +
SOURCE UNIT
RCA
Outputs
BACK VIEW
Mounting Surface
SIDE VIEW
PHONE
CABLE
To Next Amplifier or Processor
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KX AMPLIFIERS
6
System Diagram
The following diagrams show the most common configurations for your Kicker
KX series amplifier.
TWO CHANNEL OPERATION (STEREO)
KX.2 series amplifiers are capable of operating into a minimum impedance of
2 ohms per channel in stereo operation.
RIGHT SPEAKER(S)
GROUND
_
R -
REMOTE
TURN-ON
+
R+
SIGNAL OUT
18"
SIGNAL IN
or less
L -
_
L+
+12V
FUSE
+
BATTERY
LEFT SPEAKER(S)
BRIDGED OPERATION (MONO)
KX.2 series amplifiers are capable of operating into a minimum impedance of
4 ohms when in bridged operation.
GROUND
MONO
SPEAKER(S)
REMOTE
TURN-ON
R
-
_
R+
SIGNAL OUT
SIGNAL IN
18"
or less
L-
+12V
FUSE
L+
+
BATTERY
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KX AMPLIFIERS
7
System Diagram
STEREO AND MONO SIMULTANEOUSLY (SAMS)
KX.2 series amplifiers are capable of operating into a minimum impedance of
4 ohms mono and 2 ohm stereo simultaneously with the use of passive
crossovers.
GROUND
RIGHT SPEAKER(S)
_
_
HIGH PASS
CROSSOVER
R-
REMOTE
TURN-ON
+
R+
SIGNAL OUT
18"
or less
SIGNAL IN
L-
_
LEFT SPEAKER(S)
+12V
FUSE
L+
+
MONO
SPEAKER
BATTERY
HIGH PASS
CROSSOVER
+
LOW
PASS
CROSS-
OVER
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KX AMPLIFIERS
8
GAIN CONTROL
Navigation
Remember, the gain control is not a volume control, it matches
the output of the head unit to the input level of the amplifier and
must be adjusted properly for best performance. All the way up
or down is not necessarily the best.Turn the head unit up to
about 3/4 volume. (eg. If the head unit goes to 30, turn it to 25.)
Next, turn (clockwise) the gain on the amplifier up slowly until
you can hear audible distortion, then turn it down just a little.
On your Kicker amplifier there are three rotary controls on top
and one switch on the end panel. These controls ensure the reli-
ability and performance of the amplifier, so they need to be set
correctly.
CROSSOVER SWITCH
NEVER CHANGE THE CROSSOVER SWITCH SETTING WITH
THE SYSTEM ON!
Crossover Control
The switch located on the end panel next to the RCA jacks is
for setting the internal crossover. In the OFF position the
amplifier passes a full range signal to the speakers. Use the LO
position when connected to a subwoofer. The HI position should
be selected when connected to any speakers which you do not
want to receive sub-bass information.
Where you set the crossover is very subjective and can be fine
tuned to match your listening preference or speaker
requirements.
Bass Boost
The BASS BOOST control is designed to give you increased
output at 40 Hz. The setting for this control is subjective,
however, if you turn it up, you must go back and adjust the gain
control to avoid clipping the amplifier.
Crossover Selection
Switch
Input Gain Control
Low Level
High Level
170mV - 5V 340mV - 10 V
Bass Boost Control
0-18dB @ 40 Hz
BEFORE TURNING ON THE SYSTEM FOR THE FIRST TIME,
MAKE SURE THAT THE THREE ROTARY CONTROLS ON
TOP OF THE AMPLIFIER ARE
Crossover Control
50 Hz - 200 Hz 12 dB/Oct
TURNED FULLY COUNTER-CLOCKWISE!
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KX AMPLIFIERS
9
ꢀ Red LED on, no output:
1.) Amp is very hot.
Troubleshooting
ꢁThermal protection is engaged. Check for proper
impedance at speaker terminals. Also check for
adequate airflow around amplifier.
If your amplifier does not appear to be working, check
obvious things first such as blown fuses, poor or incorrect wiring
connections, incorrect setting of crossover switch and gain
controls, etc.
2.) Amp shuts down only while vehicle is running.
ꢁVoltage protection is engaged. Voltage to the amplifier
is not within the 9-16 volt operating range. Have
automobile charging/electrical system inspected.
3.) Amp will only play at low volume levels.
ꢁShort circuit protection is engaged. Check for speaker
wires shorted to each other or the vehicle chassis.
Damaged speakers or operating below minimum
impedance will also cause this.
There are two LEDs on the end panel of your Kicker KX series
amplifier, one green and one red. When the green LED is lit this
indicates the amplifier is turned on and no trouble exists. If the
green LED turns off and the red LED is lit this indicates that the
protection circuitry (SORT) is engaged.
The power indicator on top of the amplifier which illuminates
the model badge follows the same function as the green LED.
ꢀ No output from one channel:
ꢁCheck balance control on head unit.
ꢁCheck RCA & speaker connections for that channel.
If problem changes sides then you have a bad RCA
cable or source unit problem.
ꢁSwap speaker connections from left to right.
If problem changes sides then you have a bad speaker
cable or bad speaker.
ꢀ Green LED off, no output:
With a Volt Ohm Meter (VOM) check:
ꢁ+12 volt power terminal (should read +12V to +16V).
ꢁRemote turn-on terminal (should read +12V to +16V).
ꢁGround terminal.
ꢀ Green LED on, no output:
ꢀ Alternator noise (whining sound that varies with engine
RPM):
ꢁCheck RCA connections.
ꢁTest speaker outputs with known good speaker.
ꢁSubstitute known good source unit.
ꢁCheck for signal on RCA cable with VOM meter in AC
position.
ꢁCheck for damaged RCA cable.
ꢁCheck routing of RCA cable.
ꢁCheck source unit for good ground.
ꢁCheck gain setting, turn down if set too high.
ꢁSwap RCA connections from left to right.
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KX AMPLIFIERS
10
Trouble Shooting
Please Note: Modern high performance speakers have a lower
DC Resistance than what used to be available. The Kicker
Coaxial and Component Speakers are rated at four ohms (some
DC Resistances may be as low as 3 ohms) and work with any
amplifier designed to operate at a four ohm load. If you want to
use two Kicker Coaxial or Component Speakers on a single
channel of your amplifier wire the speakers in series. This will
improve the sound quality, lower the total harmonic distortion and
lessen the thermal load at the amplifier. This may prevent an
amplifier from shutting down, due to over-current protection
circuitry.
ꢀ Poor stereo image or reduced bass response:
ꢁCheck system phasing by turning the balance control
from left to right. If there is more bass output when
turned to either side then check your speaker wiring for
proper positive and negative connections. Reverse
connections on one channel if necessary.
CAUTION: When jump starting the vehicle, be sure that
connections made with jumper cables are correct. Improper
connections can result in blown amplifier fuses as well as
failure in other systems in the vehicle.
If you have more questions about the installation and operation
of your new KICKER amplifier, see the Authorized KICKER
Dealer in your area. You may also call our Technical Services
Line at (405) 624-8583 for assistance or visit our website at
NOTE: All specifications and performance figures are subject to change. Please visit the support section at www.kicker.com for the most current information.
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11
KX AMPLIFIERS
Performance
Model
KX350.2
KX450.2
KX550.2
KX850.2
RMS Power in Watts, All Channels Driven
@ 14.4V, 4Ω Stereo, < 1% THD+N
@ 2Ω Stereo, < 1% THD+N
110 x 2
175 x 2
350
70 x 2
135 x 2
265
150 x 2
225 x 2
450
90 x 2
180 x 2
360
205 x 2
275 x 2
550
115 x 2
230 x 2
420
295 x 2
425 x 2
850
180 x 2
360 x 2
650
@ 4Ω Mono, < 1% THD+N
@ 12.5V, 4Ω Stereo, 0.085% THD+N
@ 2Ω Stereo, 0.5% THD+N
@ 4Ω Mono, 0.5% THD+N
Length With EndKaps
16” (40.64cm)
19.25” (48.90cm) 22.5” (57.15cm) 25.75” (65.41cm)
Model KX350.2
110 x 2 @ 4 ohms, 14.4Vdc, 1% THD,
CEA-2006 (Watts)
Signal to Noise Ratio -98
CEA-2006 (ref: 1W, A-weighted)
SPECIFICATIONS COMMON TO ALL MODELS
Height:
Width:
2.5 inches / 6.35 centimeters
Model KX450.2
150 x 2 @ 4 ohms, 14.4Vdc, 1% THD,
CEA-2006 (Watts)
10.125 inches / 25.7 centimeters
Length Without EndKaps: Subtract 5” (12.7cm) from chart above
Signal to Noise Ratio -95
CEA-2006 (ref: 1W, A-weighted)
Frequency Response:
Input Sensitivity:
20Hz - 20kHz, + 0 /- 1dB
Model KX550.2
205 x 2 @ 4 ohms, 14.4Vdc, 1% THD,
CEA-2006 (Watts)
Signal to Noise Ratio -95
CEA-2006 (ref: 1W, A-weighted)
170mV - 5V low level, 340mV - 10V high level
>95dB, a-weighted, re: rated power
Signal-to-Noise Ratio:
Electronic Crossover:
Variable high or low pass, 50 - 200Hz,
12dB/octave
Model KX850.2
295 x 2 @ 4 ohms, 14.4Vdc, 1% THD,
CEA-2006 (Watts)
Signal to Noise Ratio -93
CEA-2006 (ref: 1W, A-weighted)
KickBass Boost:
Variable 0 to +18dB boost @ 40Hz
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12
KX AMPLIFIERS
WHAT IS NOT COVERED?
ELECTRONICS LIMITED WARRANTY
This warranty is valid only if the product is used for the purpose for which it was
designed.
It does not cover:
Kicker warrants this product to be free from defects in material and workmanship
under normal use for a period of THREE (3) MONTHS from date of original
purchase with receipt. When purchased from a Authorized KICKER Dealer it is
warranted for TWO (2) YEARS from date of original purchase with receipt. In all
cases you must have the original receipt! Should service be necessary under this
warranty for any reason due to manufacturing defect or malfunction during the
warranty period, Kicker will repair or replace (at its discretion) the defective
merchandise with equivalent merchandise at no charge. Warranty replacements may
have cosmetic scratches and blemishes. Discontinued products may be replaced
with more current equivalent products.
•
•
•
Damage due to improper installation.
Subsequent damage to other components.
Damage caused by exposure to moisture, excessive heat, chemical cleaners,
and/or UV radiation.
Damage through negligence, misuse, accident or abuse. Repeated returns for
the same damage may be considered abuse.
•
•
•
•
•
•
•
•
•
•
Any cost or expense related to the removal or reinstallation of product.
Speakers damaged due to amplifier clipping or distortion.
Items previously repaired or modified by any unauthorized repair facility.
Return shipping on non-defective items.
Products with tampered or missing barcode labels.
Products returned without a Return Authorization (RMA) number.
Freight Damage.
This warranty is valid only for the original purchaser and is not extended to
owners of the product subsequent to the original purchaser. Any applicable implied
warranties are limited in duration to a period of the express warranty as provided
herein beginning with the date of the original purchase at retail, and no warranties,
whether express or implied, shall apply to this product thereafter. Some states do
not allow limitations on implied warranties, therefore these exclusions may not apply
to you. This warranty gives you specific legal rights; however you may have other
rights that vary from state to state.
The cost of shipping product to Kicker.
Service performed by anyone other than Kicker.
WHAT TO DO IF YOU NEED WARRANTY OR SERVICE
HOW LONG WILL IT TAKE?
Defective merchandise should be returned to your local Authorized Stillwater
Designs (Kicker) Dealer for warranty. Assistance in locating an Authorized Dealer
confirm that a dealer is authorized by asking to see a current authorized dealer
window decal.
Kicker strives to maintain a goal of 72-hour service for all electronics (amplifiers,
crossovers, equalizers, etc.) returns. Delays may be incurred if lack of replacement
inventory or parts is encountered.
INTERNATIONAL WARRANTY
If it becomes necessary for you to return defective merchandise directly to
Stillwater Designs (Kicker), call the Kicker Customer Service Department at
(405)624-8510 for a Return Authorization (RMA) number. Package all defective
items in the original container or in a package that will prevent shipping damage,
and return to
Contact your International Kicker dealer or distributor concerning specific
procedures for your country’s warranty policies.
Stillwater Designs, 5021 North Perkins Road, Stillwater, OK 74075
The RMA number must be clearly marked on the outside of the package. Please
return only defective components. The return of functioning items increases your
return freight charges. Non-defective items received will be returned freight collect.
P.O. Box 459 • Stillwater, Oklahoma 74076 • U.S.A. • 405 624-8510
KICKER drivers are capable of producing sound levels
that can permanently damage your hearing! Turning up a
system to a level that has audible distortion is more
damaging to your ears than listening to an undistorted
system at the same volume level. The threshold of pain
Include a copy of the original receipt with the purchase date clearly visible, and a
“proof-of-purchase” statement listing the Customer’s name, Dealer’s name and
invoice number, and product purchased. Warranty expiration on items without proof-
of-purchase will be determined from type of sale and the manufacturing date code.
Freight must be prepaid; items sent freight collect, or COD, will be refused.
is always an indicator that the sound level is too loud and
WARNING:
may permanently damage your hearing.
Please use common sense when controlling volume!
Failure to follow these steps may void your warranty. Any questions can be
directed to the Kicker Customer Service Department at (405) 624-8510.
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04202005+04KX.2
13
KX Amplifiers
Notes
Tech Lines
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KX AMPLIFIERS
14
Pizza Delivery #’s
Hookups
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KX AMPLIFIERS
15
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