Audio Control ACX-300.2 User manual

COMPACT HIGH POWER ALL-WEATHER 2-CHANNEL AMPLIFIER
ACX-300.2
Quick Start Guide
Features
• Compact High Power 2-Channel Amplier
• High Current Design
• 2 x 75 Watts @ 4 Ohms
• 2 x 150 Watts @ 2 Ohms
• 1 x 300 Watts @ 4 Ohms, Bridged Mono
• 12 dB/Octave Linkwitz-Riley Alignment Crossover
• GTO™ Signal Sense (Great Turn On)
• 2 Speaker-level / Line-level RCA Inputs
• All-weather IPX6 rated!
• Filled with home-grown audio goodness

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ACX-300.2
Quick Start Guide
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as muers, silencers, exhaust
pipes, or other apparatus (including ampliers) that produce heat.
9. WARNING: Improper installation may lead to permanent injury or death.
Installation of the apparatus must be done with great care by qualied
personnel, to prevent damage to fuel lines, power and other electrical
wiring, hydraulic brake lines, and other systems, that might compromise
vehicle safety.
10. Provide +12V and Ground wiring of sucient size to ensure adequate
current to the amplier. For the ACX-300.2 this means 8 gauge wire or
thicker.
11. Use rubber grommets to protect wiring whenever passing wires through
metal openings or bulkheads.
12. Only use attachments/accessories specied by the manufacturer.
13. Refer all servicing to qualied service personnel. Servicing is required
when the apparatus has been damaged in any way, such as the power
input terminals are damaged or objects have fallen into the apparatus,
does not operate normally, or has been dropped.
14. Fuses shall be replaced only with the correct type and fuse value, and
only when the apparatus is powered o.
15. Exposure to high sound pressure levels may lead to permanent hearing
loss. Take every precaution to protect your hearing.
The lightning ash with arrowhead symbol within an equilateral
triangle is intended to alert the user to the presence of uninsulated
“dangerous voltage”within the product’s enclosure, that may be of
sucient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to
alert the user of the presence of important operating and mainte-
nance (servicing) instructions in the literature accompanying the
appliance.
Caution: to reduce the risk of electric shock, do
not disassemble the apparatus, other than to
remove the top panel to access the controls.
There are no user-serviceable parts inside.
Refer servicing to qualied personnel.
Recycling notice: If the time comes and this apparatus has fullled
its destiny, do not throw it out into the trash. It has to be carefully
recycled for the good of mankind, by a facility specially equipped
for the safe recycling of electronic apparatii. Please contact your
local or state recycling leaders for assistance in locating a suitable
nearby recycling facility. Or, contact us and we might be able to
repair it for you.
Important Safety Instructions

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1. Speaker Outputs –
In Stereo operation, connect one loudspeaker to each channel.
The minimum impedance is 2 Ohms per channel.
In Bridged Mono operation, connect one loudspeaker to the
outer 2 wires - White(+) and Grey/Black(-). The mono loudspeaker
will be powered by each channel, and both input channels must
be fed a signal. The minimum impedance is 4 Ohms.
2. Power Input Terminal +12V & Ground – Connect these wires
to the +12V and Negative binding posts of the vehicle battery
via one of two included harness options. You may use either the
included water resistant harness, or the included harness kit to
terminate your own custom-length water-resistant harness. Use
quality insulated wiring of the recommended wire gauge, such as
wire gauge 8 or thicker.
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Connections & Control Panel Features

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ACX-300.2
Quick Start Guide
3. Remote Power Input Wire – This wire connects to the 12V remote
trigger output of some head units and controls the on/o state of
the amplier. Alternatively, you can use the GTO™ feature of the
amplier so it will turn on when an speaker level signal is detected
at the RCA inputs.
4. Power LED – When the unit has been powered on, this LED will
glow green and soft, like the understory of the Pacic Northwest
Rain Forest on a rare, sunny day.
5. Input Level – Use this switch to specify which type of signal input
voltage type you are using - high is speaker level & low is the RCA
line level.
6. Protection LED – This LED will shine if there is a problem being
sensed by the unit. If this lights up, remove the speaker connec-
tion and RCA inputs and try again. If error clears, examine your
speaker, speaker wires, and RCAs for possible causes of short. If
the issue still persists after removing the speakers/RCAs, best to
call the lonely folks in tech support.
7. Gain Control – This control allows you to adjust the overall
output level. Turn clockwise to increase, and counter-clockwise to
decrease. With the source unit set to 75%, adjust this knob to the
point where the Maximized light shines briey. This will be your
optimal gain setting.
4 5 6 7 8 9 10

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8. High Pass Crossover – A crossover allows you to match a speaker
to the frequency range it is designed to handle. Choosing the
crossover point recommended by the speaker manufacturer will
provide increased speaker reliability and optimum sound quality.
The ACX-300.2 amplier has selectable high pass crossover
frequencies at 80 Hz, 120 Hz, and a “bypass”option. The amplier
reproduces the frequency range above the selected crossover
frequency.
9. Maximized – This LED will shine when the signal is approaching
the clipping point. With your source unit turned up to 75%, use
your gain controls to dial in the output by watching for this LED to
shine, then back it o just a touch.
10. GTO™ Signal Sense – In the ON position, the ACX-300.2 amplier
will gracefully turn on when it detects an incoming audio signal
and turn o after a period of time when the audio signal fades
away to silence. In some situations, factory installed audio systems
may turn on or “wake up” due to convenience features like door
chimes, alarms or cell phone signals that trigger the source unit in
the vehicle to come on. To prevent these from turning your audio
system on unexpectedly, you can bypass the GTO™ circuit by mov-
ing the switch to the OFF position and use a switched 12v trigger
from the vehicle.
**Pro tip - if using speaker- level/high-level inputs, you’ll
need some RCA ends on the ends of the speaker wire
to attached to the RCA inputs. Setting the Input Level
to High of course.
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11. RCA Inputs – This is where you connect your source signal to. If
using low level signals, make sure your Input Level setting switch
is set to Low. If you are using high or speaker level signals, set your
Input Level to High.

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ACX-300.2
Quick Start Guide
Here are a few general steps to get your ACX-300.2 amplier up and
running:
1. Undo the +12V and Ground connections to the vehicle battery
before making any connections to the amplier.
2. Pick a mounting location that will provide access to the controls
and connections, provide plenty of good ventilation.
3. The ACX-300.2 amplier needs to be securely mounted using the
four mounting holes located in each corner.
4. Before drilling any holes, take every precaution to prevent
any damage to fuel lines, power and other electrical wir-
ing, hydraulic brake lines, and other systems, that might compro-
mise vehicle safety.
5. When making connections, designate red RCA plugs as right,
and designate white, black, or gray plugs as left. This is a good
idea for consistency.
6. Use quality interconnect cables.
7. Connect the +12V input wire on the included wiring harness
assembly to the +12V terminal of the vehicle battery, using the
appropriate gauge wire.
8. Connect the Ground wire of the power wiring harness assembly
to a ground source such as the negative battery terminal, vehicle
chassis or other ground source, using the same wire gauge as
the +12V power wire.
9. Connect the remote power terminal of the unit to the remote
turn-on switch of your source unit. Alternatively, you can skip
this connection and use the GTO™ Signal sensing.
10. Connect your audio inputs to the unit – either speaker-level or
line-level RCA… not both.
11. Connect your loudspeakers (minimum impedance of 2 Ohms
stereo, or 4 Ohms bridged mono).
12. When all connections are made, reconnect the vehicle battery.
13. Adjust your gain settings to maximize your signal level.
14. Set the ACX-300.2 crossovers to the frequency recommended by
the loudspeaker manufacturer.
15. Enjoy the drive!
Quick Start

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In this example, the head unit has a +12V trigger output that is con-
nected to the ACX-300.2 remote input terminal. When the head unit is
turned on, it will turn on the ACX-300.2 amplier.
Alternatively, the GTO™ Signal Sense feature can be used to gently
turn on the ACX-300.2 amplier when an audio input signal is detect-
ed. (The connection to the ACX-300.2 remote input terminal is not
required when using the GTO™ Signal Sense.)
12V Trigger
Source Unit
To Battery
Speaker-level Outputs
Power Connections

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ACX-300.2
Quick Start Guide
Source Unit
Stereo operation, Input Level: High / 2 Ohms minimum per channel
Speaker-level Output
(80 Hz and down)
Speaker-Level Outputs
(80 Hz and up)
Speaker-Level Signal Wires
To Battery
To Battery
System #1: Using Speaker-Level Inputs & GTO™Signal Sense Turn On

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The cover plate must be removed to gain access to the controls, and
then sealed again to protect the controls against moisture and debris.
Removal Procedure
1. Locate the top six hex screws that hold down the sealed top
cover.
2. Use a 2.5mm hex wrench to remove the six screws.
3. Gently lift cover o. It’s a very tight t there, so you may need to
use some gentle force. Yes, it is with you!
4. Keep the cover plate and screws in a safe and handy place, until
you have nished adjusting the controls to your immense satis-
faction.
Cover Plate Removal

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ACX-300.2
Quick Start Guide
All specications are measured at 14.4 VDC (standard automotive voltage). As technology advances, AudioControl reserves the right to continuously
change our specications, like our Pacic Northwest weather, although we are working on changing that as well.
The ACX-300.2 Amplifier
Power Output (RMS) ...........................2x75 Watts @ 4 Ohms
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2x150 Watts @ 2 Ohms
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1x300 Watts @ 4 Ohms Bridged
Frequency Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Hz - 22 kHz
Total Harmonic Distortion + N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 0.05%
S/N Ratio ........................... 102 dBa, Ref 50 Watts @ 4 Ohms
Power / Ground Wire Gauge ...................Between 8 and 4 AWG
Recommended fuse rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Amps
Crossover. . . . . . . . . .12dB/Octave Linkwitz-Riley, 80 Hz, 120 Hz, Bypass
Line/Speaker-Level Inputs . . . . . . . . . . . . . . . . . . 500mV - 6V/1V - 12VRMS
Weight .....................................................3.15 lbs.
Dimensions...............................8.89”W X 3.86” D X 2.36” H
©2022 AudioControl. All rights reserved.
Specifications
Warranty
For details of the limited warranty for your ACX-300.2, please visit the
following page on our website: audiocontrol.com/warranty
Please keep your receipt in a safe place.
AudioControl, Inc.
22410 70th Avenue West
Mountlake Terrace, WA 98043 USA
Phone: [phone]
email: [e-mail]

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Complimentary Notes page (lled with horizontal lines that may be used for notes, sonnets, poems, shopping lists, and complex crossover equations)

ACX-300.2
Quick Start Guide PN 915-031-0 Rev A
An Extra-generous, Second Complimentary Notes page