Aunex AC Series User manual

AC Series 4 Channel Ampliers
Compact Full Range Class D Amplier Series
Models: AC600.4D, AC1000.4D, AC1500.4D, AC2000.4D
Installation and Operation Manual
Please take time to thoroughly read through this manual to familiarize yourself with your new amplier.
This will ensure that your amplier will perform at its optimum capabilities.
Para obtener una copia de este manual en español, visite www.aunexusa.com y luego vaya a la página
del producto que necesita. Haga clic en la pestaña Soporte y descargue su manual en español.

1
Congratulations and thank you for purchasing an Aunex AC Series
Amplier. This product has been engineered and manufactured
utilizing precision quality parts and craftsmanship. Improvements
in sound quality and system performance will be greatly enhanced
with the use of this amplier.
To ensure maximum performance we highly recommend you have
your new Aunex product installed by an Authorized Aunex Dealer.
Should you decide to install this product yourself, please make
sure to read this manual thoroughly to familiarize yourself with
the necessary installation requirements and tuning procedures.
Please read your warranty and retain a copy of your purchase
receipt and original carton should your Amplier ever needs to be
serviced and warranted.
Visit our website for the latest information on all Aunex products
at: www.aunexusa.com. If you have any questions regarding
this product, please contact your Authorized Aunex Dealer for
assistance or call / email Aunex Technical Support Department at
[phone] / [email protected].
Caution: Continuous exposure to sound pressure levels over 100dB
may cause permanent hearing loss. High powered audio systems can
produce sound pressure levels that can exceed over 150dB. Please limit
your exposure to continuous high listening volumes.

2
Feature Set of the AC Series 4 Channel Ampliers
• Heavy Density Aluminum Extruded Heatsink
• 4 Layer PCB, SMD Technology
• Conformal Coated PCB
• Dierential Balanced RCA Inputs
• Output Clipping Indicators
• Fully Variable Crossover 12dB/Octave Slope
• Frequency Multiplier x1 & x10 on HP Filters
• Dual Boost Circuitry Active in both HP and LP Modes
• Input Mode Selector (2Ch. or 4 Ch.)
• Autosensing in High Level Input Mode
o Remote Input Becomes Remote Output Trigger if
High level Input is used.
• Power and Protection Logo Illuminated Status Indicator
o Blue Indicates Amplier is powered On
o Red Indicates the Amplier is in Protection
• Blue Illuminated Power Input and Speaker Output Terminals
• 4 Gauge Power & Ground Terminals
• 8 Gauge Speaker Output Terminals
• Advance Protection Circuit Monitoring: Short, Thermal,
Overload and Impedance
• Finish: Anodized with Texture Paint
What’s Included
• (1) AC Series 4 Channel Amplier
• (1) In-Line Fuse Holder with Mini ANL Fuse
o AC600.4D is supplied with a 60A Fuse
o AC1000.4D is supplied with a 100A Fuse
o AC1500.4D is supplied with a 150A Fuse
o AC2000.4D is supplied with a 200A Fuse
• (4) Self Tapping Screws and (4) Washers
• (2) Allen Wrenches
• (1) Instruction Manual
• (1) Sticker

3
Important Safety Considerations
• To prevent personal injury and damage to the unit, please read
the following instructions in this manual.
• This product is designed to use in vehicles with 12Volt,
negative-ground electrical systems.
• Install this product in a dry location away from your vehicles’
safety equipment (airbags, seat belt system, etc.). Water and
humidity may damage internal components.
• Use the included mounting accessories to secure this product
so that it does not come loose.
• Check before drilling to make sure you do not drill into any vital
vehicle system.
• Protect all system wiring from sharp metal edges.
• Do not disassemble or modify this unit; doing so will void your
manufacturer’s warranty.
Important Installation Precautions
Installation of mobile audio equipment requires experience.
Although this manual provides general installation procedures,
it will not show the exact installation method for your particular
vehicle.
If you do not have the required knowledge and experience,
we recommend that you have your equipment installed by an
Authorized Aunex Dealer.
• Turn o all stereo and other electrical devices before you begin.
• Disconnect the negative (-) lead from your vehicle’s battery to
avoid an electrical short. Reconnect the negative lead to your
battery once your installation is complete. So, in other words
the negative lead from our vehicle’s battery is the rst
connection you remove before starting your installation and
the last connect your make after you nish your installation.
• Check your mounting location to make sure there is sucient
room for your installation placement preference.

4
Mounting Placement
Choose a structurally sound location to mount your Aunex
amplier, making sure there are no items behind the area where
the screws will be driven.
For optimum sound quality, it is highly recommended that you
purchase Aunex wiring accessories as they are designed to give
your ampliers high-quality signal it needs to operate at peak
performance levels. Aunex provides a wide selection from
RCA cables and power wire to speaker wire and battery
connectors.
Important Installation Precautions Continued
• Install this product in a dry location away from your vehicles’
safety equipment. Each AC Series amplier circuit board has
been coated with a protective layer of Conformal Coating. This
will help protect the electronic circuit from harsh environments
that may contain humidity and a range of airborne contaminants
and varying temperatures. However prolonged exposure to
water and high humidity may damage internal components in
time. Keeping the amplier dry and installed in a well-ventilated
area will help ensure many years of listening enjoyment.
• When running power cables through sheet metal it is best to
use grommets and loom to properly insulate your cables from
metal edges.
• Avoid mounting the amplier with the top ns facing down as
this may increase the operating temperature of your amplier.
• If mounting underneath a seat, make sure that there is at least
1 inch (25mm) of space above the amplier to permit proper
cooling.
• Avoid mounting the ampliers on a subwoofer enclosure as
prolonged excessive vibration may damage your amplier.

5
Side Panel Layout
1 2
10 11 12 13
3
4 5 6 7 8 9

6
1. Low Level RCA Inputs: These are your dierential balanced
inputs that are used to connect audio signal from your headunit /
source unit to your amplier. Your AC Series Amplier is capable
to receiving either High Level Speaker Outputs or Low-Level RCA
cables. If you are using High Level Speaker outputs, you may need
a high to low level adapter such as the Aunex AP-SL2 adapter.
2. Input Mode Selector: This switch allows you to select the
number of RCA inputs used to send audio signal to your
amplier. In 2 Channel Mode, only 1 set of RCA inputs is
needed to drive all 4 output channels. (You will need to set the
Input Mode switch to the 2Ch. position.) In 4 Channel Mode, all
4 RCA inputs will be connected and the Input Mode switch will
need to be set to the 4Ch. position.
3. Clipping Led Indicators: These LED’s will light up when the
amplier output signal is being clipped. When the LED’s starts
to glow, your amplier output is between 1-2% THD (Total
Harmonic Distortion). When the clipping indicators are fully lit,
your amplier output is between 6-7% THD (Total Harmonic
Distortion). The ideal gain setting is where the clip indicators are
not lit allowing the amplier to send undistorted clean output.
Setting the ampliers gains improperly where the clip indicators
are always lit will over-work the amplier and may cause
excessive heat building and possibly product.
4. Input Gain: Use these Input Gain Potentiometers to match the
output voltage of your headunit / source unit to the input circuit
of your amplier. These Input Gains are not a volume knob.
A simple method of setting your Input Gains is to turn your
head adunit / source unit up to approximately ¾ volume. Then
slowly adjust your Input Gains on your ampliers clockwise until
you can hear distortion from your speakers or subwoofers. Then
turn the gains down (counter clockwise) till the distortion is no
longer heard and your clipping indicators are not lit.
Side Panel Layout Continued

7
5. Boost Eq: Your AC Series amplier incorporates a two stage
Boost Eq. circuit that is not only active in Low Pass Mode but is
also active in High Pass Mode. In Low Pass Mode, the Boost
Eq. can increase output 0-18dB centered at 45Hz. In High Pass
Mode, the Boost Eq can increase output 0-18dB centered
at 12kHz. Note if you turn up the Boost Eq, you will need to
readjust the Input Gains to avoid clipping the output signal.
Using the Clipping LED’s will help set your Boost Eq and Input
Gains properly.
6. Low Pass (LP/BP) Filter Frequency Filter: This
potentiometer is used when the amplier is set to Low Pass
Mode and allows you to adjust the crossover frequency from
40Hz – 400Hz.
7. Crossover Filter Selector: Depending on how you will use
your AC Amplier, you will select the appropriate setting on the
Crossover switch. Set the Crossover Switch to LP/BP mode if
you are using Subwoofers or MidBass drivers. Set the switch
to HP if you want the amplier’s internal crossover to serve as
a high pass lter. When the switch is set to the Full position
will allow the amplier to send its full bandwidth to your
speakers. Avoid changing the crossover switches with the
audio system playing at high volumes as this may damage
your speakers.
8. High Pass Filter Frequency Filter: This potentiometer is
used when the amplier is set to High Pass Mode and allows
you to adjust the crossover frequency from 40Hz – 400Hz.
9. Multiplier x1 and x10 Selector: This selector is a
frequency multiplier that aects the HP Filter. If the amplier is
used in High Pass mode, selecting the x1 position will allow you
to adjust the frequency between 40Hz – 400Hz and up. Pushing
the button to the x10 position will now allow you to adjust the
frequency between 400Hz to 4,000Hz and up. Using the x10
position is ideal if you are using the amplier to run midranges
where you do not want lower frequencies to be reproduced.
Side Panel Layout Continued

8
10. Speaker Outputs: Your AC amplier speaker outputs are
designed to accept 16 AWG to 8 AWG wire. Turn the set
screws on this terminal counterclockwise to loosen the
screws using the supplied Hex wrench. Strip the PVC jacket
from your speaker wire ½ inch (12mm). Then insert the bare
wire into the terminal block so that no bare speaker wire is
exposed. Then tighten the set screw by turning it clockwise.
Loading your amplier below the recommended
impedance rating found on page 15 is not
recommended and may cause your amplier to
enter into protection mode and may void your warranty.
For maximum current ow, Aunex recommends that you tin
your speaker wire before connecting it to the speaker output
terminals. In addition, Aunex recommends using high
quality 100% OFC (Oxygen Free Cooper) or Tinned 100% OFC
speaker wire. This will ensure that your speaker /
subwoofer receives maximum output from your amplier.
11. +12Volt Positive Terminal: The +12Volt positive terminal is
designed to accept up to 4 AWG wire. Use the supplied fuse
block and make your +12Volt connection directly to the positive
battery post. The Fuse should be installed within 18” (457mm)
of the battery. This fuse is vital to protecting the vehicle and
amplier from a dead short. Turn the set screws on this termi-
nal counterclockwise to loosen the screw using the supplied
Hex wrench. Strip the PVC jacket from your speaker wire ½
inch (12mm). Then insert the bare wire into the terminal block
so that no bare speaker wire is exposed. Then tighten the set
screw by turning it clockwise.
Side Panel Layout Continued

9
For maximum current ow, Aunex recommends that you tin
your power wire before connecting it to the +12Volt terminal. In
addition, Aunex recommends using high quality 100% OFC
(Oxygen Free Cooper) or Tinned 100% OFC speaker wire. This
will ensure that your speaker / subwoofer receives maximum
output from your amplier.
12. Remote Input Terminal: This terminal must be connected to
a switched +12Volt source. If the source unit does not have a
remote Turn on lead, then a switched +12 supply should be
used such as the ACC +12Volt. Run an 18-gauge wire from the
Remote Turn-On Lead from your headunit / source unit to this
terminal.
If you are using the High-Level Speaker Outputs connection
to the ampliers’ RCA inputs, you do not need to connect
a remote input to your amplier. Your amplier will
automatically detect the speaker signal and will turn on
your amplier via its DC Oset circuit. In addition, the
remote input terminal then becomes a remote output
trigger which can be used to turn on another amplier
or processor that requires a +12volt remote connection.
13. Ground: The Ground terminal is designed to
accept up to 4 AWG wire. Make your ground connection
directly to the chassis of the vehicle as close to the amplier as
possible. Make sure this connection is made with the
same gauge wire as used for your +12Volt connection.
Ensure that all dirt, grease and paint is removed from your
chassis ground point prior to attaching the ground wire. Aunex
recommends when making your chassis ground to use a
Star Washer which will help prevent your ground bolt from
loosening.
Side Panel Layout Continued

10
Power Connection
For maximum current ow, Aunex recommends that you tin your
ground wire before connecting it to the ground terminal of your
amplier. In addition, Aunex recommends using high quality 100%
OFC (Oxygen Free Cooper) or Tinned 100% OFC speaker wire.
This will ensure that your speaker / subwoofer receives maximum
output from your amplier.
Connect to Source unit’s
accessory lead or
switched 12v source
Connect to
chassis ground
of vehicle. Keep
Grounds as short
as possible
See Specifications
for Fuse Rating
Fuse
Less
than 18”
Vehicle Battery
_
NEG
+
POS

11
Common Installation Diagrams
The illustrations below show the common installation
methods for your amplier. It is important to make sure that the
impedance of the speakers connected to your amplier are either
in 4-ohms stereo, 2-ohms stereo or 4-ohms bridged. Connecting
your amplier below these impedances are not recommended
as they will cause your amplier to go into protection. If you are
unsure of the impedance, it is recommended that use a DMM
(Digital Multi-Meter) to check the impedance of your connection at
the ampliers’ Speaker Output Terminals. Your amplier will need
to be o in order to get accurate measurements.
+_+_2 ohm
Minimum
2 ohm
Minimum
2 ohm
Minimum
2 ohm
Minimum
Full Range
Speakers
Full Range
Speakers
+_
+_
4 - Channel Speaker Output Connection
Side Panel Full
Switch Position
Side Panel HP
Switch Position
OR

12
Common Installation Diagrams Continued
Subwoofer
4 ohm
+_
2 ohm
Minimum
2 ohm
Minimum
Full Range
Speakers
+_
+_
3 - Channel Stereo/Mono Speaker Output Connection
Side Panel
Switch Position
Side Panel
Switch Position
OR

13
Common Installation Diagrams Continued
Subwoofer
4 ohm Minimum
2 - Channel (Bridged Mode) Speaker Output Connection
Subwoofer
4 ohm Minimum
+_
+_
Side Panel
Switch Position

14
Note: One of the leading causes of amplier
failure is using inferior Power, Ground and
Speaker wires that are not sucient in
quality to deliver the necessary current to keep your
amplier performing at its peak level. As all
Aunex ampliers are designed to deliver high
power output, we recommend that you do
not use any power wires that contains CCA
(Copper Clad Aluminum). Instead we recommend
only using high quality 100% OFC (Oxygen Free
Copper) or 100% Tinned OFC (Oxygen Free
Copper) wires. This will help give your
amplier the proper current and will ensure
that your amplier will perform at this peak
perform level for many years to come.
Ask your Authorized Aunex Dealer or visit
www.aunexusa.com to view the complete line of
installation accessory that will compliment
your audio investment. Aunex provides a wide
election from RCA cables and power wire
to speaker wire and battery connectors.

15
Technical Specications
*Due to continuous product improvements; specications and features are
subject to change without notice. Please visit www.aunexusa.com for the
most current information.
*This manual is the exclusive property of Aunex, Inc. Any reproduction of this
manual or use other than its intended purposes is strictly prohibited without
the express written consent of Aunex, Inc. ©Copyright 2020 Aunex, Inc.

16
Troubleshooting
Problem Solution
1. Check to see if Power, Remote and Ground is
connected to the Amplifier.
2. Check Power and Remote Turn-on lead for proper
+12 Voltage. (12 - 16 Volts DC acceptable range.)
3. Check the inline fuse, replace if necessary.
1. Check your RCA connectors to see if there is signal
with a DMM (Digital Multi-Meter) to measure AC
voltage.
2. Check your speakers to see if there is short.
1. Readjust your amplifiers gains to lower setting.
2. Readjust your source unit volume.
3. Make sure your RCA's and Speaker wires are routed
away from your Power and Ground connections.
4. Remove existing ground wires for all electrical
components. Reground wires to a different location.
Verify the grounding location is clean, paint from ground
point has been removed and is rust free.
5. Add a secondary ground cable from the negative
battery terminal to the chassis metal or engine block of
vehicle.
6. Check your RCA cables or speaker input for any
damage.
1. Readjust your amplifiers gains to a lower setting.
2. Readjust your source unit volume.
3. Readjust the Boost Eq.
1. Amplifier may be in thermal protection due to heat.
2. Check the inline fuse, replace if necessary.
3. Check the voltage at the amplifier power input
terminals.
Logo Status LED is Red /
Protection Circuit Active
Amplifier does not work; no
LED's on
Amplifier powers up; no sound
Distorted sound from speakers
Hissing / Enginer noise from
speakers

17
California’s Proposition 65 (Prop 65) entitles consumers in
California to special warnings for products that contain
chemicals knows to the state of California to cause cancer,
birth defects or other reproducttive harm if consumers are
exposed to such chemicals above certain threshold levels.
While this law is only for California and Aunex sells products to
consumers in California, Aunex is required to display this warning.
California Prop 65 Warning
Warning: This product can expose you to
chemicals which are known to the State of
California to cause cancer or birth defects
or other reproductive harm. For more
information visit www.p65warnings.ca.gov.
Limited Warranty – AC Series Ampliers
Aunex, Inc. warrants this product to be free of defects in
materials and workmanship for a period of 1 year from the original
purchase date. This warranty is non-transferrable and applies only
to the original purchaser from an Authorized Aunex Dealer. (Any
Factory Refurbished Amplier (B-Stock Products)
carries a 90 Day warranty period.) Should service be necessary
within the warranty period, Aunex will at its discretion repair or
replace the defective unit with a new or remanufactured
product at no charge. Damage caused by misuse, abuse,
accidental damage, product modication, failure to follow instal
ation instructions, unauthorized repairs will not be covered
under warranty. This warranty does not cover incidental or
consequential damages and does not cover the cost of having the unit
removed or reinstalled. Cosmetic damages by accident or
normal wear and tear are not covered under warranty.
Subsequent damage to a other component will not be covered.
Warranty

Warranty will be voided if the product’s serial number has been
removed or defaced. Any applicable implied warranties are
limited in duration to a period of the express warranty as
provided in this manual beginning with the date of the original
purchase and no warranties whether express or implied shall apply to
this product thereafter. Some states do not allow limitation on implied
warranties; therefore, these exclusions may not apply to you.
This warranty gives you specic legal rights; however, you
may have other rights that vary from state to state.
All warranty returns should be sent to Aunex freight prepaid
and must be accompanied by proof of purchase; a copy of the
purchase sales receipt. All returns whether sent by the Dealer of
purchase or directly from the consumers must have a valid RMA
number (Return Merchandise Authorization). Returns without a
valid RMA number will be refused. The RMA number must
be clearly written on the outside of your return package.
Non-defective units will be returned to sender freight collect.
Customers are responsible for shipping charges and insurance
in sending products back to Aunex. Freight damage on returns is
not covered under warranty so be sure to package your return in
the original box or packaged securely in another box to prevent
possible freight damage. Warranty expiration on items without proof
of purchase will be determined from the manufacturing date code.
Products purchased outside of the United States of America
are covered by that country’s distributor and not by Aunex, Inc. For
Service Information in the U.S.A. and to obtain a Return Merchandise
Authorization number (RMA) please call Aunex at [phone].
Warranty Continued

Declare Your Independence!
Aunex, Inc.
13865 Magnolia Avenue, Unit C
Chino, CA 91710
T. [phone] / F. [phone]
8:30am – 5:30pm (PST – Pacic Standard Time)
www.aunexusa.com