AudioControl ACX-300.4 4-Channel Powersports / Marine All Weather Amplifier
AudioControl ACX-300.4 4-Channel Powersports / Marine All Weather Amplifier
AudioControl ACX-300.4 4-Channel Powersports / Marine All Weather Amplifier
AudioControl ACX-300.4 4-Channel Powersports / Marine All Weather Amplifier
AudioControl ACX-300.4 4-Channel Powersports / Marine All Weather Amplifier
AudioControl ACX-300.4 4-Channel Powersports / Marine All Weather Amplifier

AudioControl ACX-300.4 4-Channel Powersports / Marine All Weather Amplifier



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Now available, the AudioControl ACX-300.4 all-weather amplifier, the ultimate powerhouse for your outdoor adventures! Whether you're cruising on your boat, tearing up the trails on your ATV, or hitting the open road on your motorcycle, the ACX-300.4 is the perfect companion for all your audio needs.

With its impressive power output of 50 watts RMS into a 4Ω load and 75 watts RMS into a 2Ω load, the ACX-300.4 delivers crystal-clear, high-fidelity sound that will take your music experience to the next level. And with both RCA line-level and speaker-level inputs, you can connect your audio source in whatever way works best for you.

But that's not all - the ACX-300.4 is designed to withstand even the harshest outdoor environments. Its rugged, all-weather construction means you can take it anywhere, without worrying about damage from water, dust, or debris. And with its compact size and easy installation, you can easily mount it wherever you need it most.

So why settle for mediocre sound when you can have the best? Upgrade your outdoor audio experience with the AudioControl ACX-300.4 all-weather amplifier and get ready to rock your next adventure!


  • High-/Low-Level Inputs: The ACX-300.4 includes four built-in 12" RCA inputs that can accept either high- or low-level input signals. If running high-level signals, RCA to speaker-wire adapters must be used (sold separately), or the RCA connectors must be cut off and the bare-ended wire used.

    • Low-Level Input Range: 500mV - 6Vrms
    • High-Level Input Range: 1Vrms - 12Vrms
  • Input Mode: A 2-way switch lets you select whether one pair or both pairs of input channels will be used to feed all four output channels.

  • Crossovers: The ACX-300.4 includes two 12 dB/octave Linkwitz-Riley high-pass filters, one for Channels 1 & 2 and one for Channels 3 & 4. Both use a 3-position switch to change the crossover point with a choice of  80Hz, 120Hz, or Bypass.

  • Gain Maximized LEDs: Each pair of channels on the amp includes its own Gain control to properly set the overall output level. A Maximized LED indicator is provided for each pair of channels, illuminating to let you know when the output signal has reached its optimum performance level, helping to avoid running a distorted signal to your speakers.

  • GTO (Great Turn On) Signal Sense: If you are connecting the amplifier to a factory stereo, or an aftermarket unit without preamp outputs and a remote turn-on lead, the GTO Signal Sense circuitry can turn on the amplifier when an audio signal is detected on either the line-level or speaker-level inputs. After a period of time with no signal input, the amp will turn itself off.

  • All-Weather Construction: The ACX-300.4 amp has been constructed to withstand outdoor environments and carries an IPX6 waterproof rating, making it impervious to weather. A removable cover-plate on top of the amp protects the controls and LED indicators from dust and moisture ingress. The cover-plate screws require a 2.5mm hex bit for removal (not included). All wire harnesses on the amp are built-in for added weather resistance:

    • Audio Inputs: Four RCA jacks on 12" input cables are provided, each with protective plastic caps.
    • Speaker Outputs: Two 12" 4-wire output harnesses are terminated in waterproof connectors. Matching 7" harnesses with bare-ended 18ga. wires are included.
    • Power/Ground/Remote: A 12" section of 10ga. power and ground wire terminates in a waterproof connector, with matching 7" harness and bare-ended wire. An additional empty power/ground connector is provided, letting you build your own harness to match the amp's power/ground connector. A bare-ended 12", 18ga. remote turn-on wire is provided in the power/ground harness.


  • Mounting: The AudioControl ACX-300.4 features built-in mounting flanges on either end of the amp, with two pre-drilled holes in each, allowing the amp to be mounted in a variety of locations. Four 3/4" screws are provided for mounting.


What's In The Box

  • 4-Channel amplifier (attached 12" power/ground/input/output harnesses)
  • 7" Power & ground harness (10 ga.)
  • Two 7" speaker output harnesses
  • Power & ground harness (empty)
  • 2 Crimp-on terminals for power & ground harness
  • Harness locking pin
  • 2 Rubber grommets
  • Four 3/4" screws
  • User Guide 


Preamp/Speaker-Level Inputs


Preamp-Level Voltage Range

500mV - 6Vrms

Speaker-Level Voltage Range

1Vrms - 12Vrms


Continuous Output Power (14.4V)

4Ω: 50W RMS x 4

2Ω: 75W RMS x 4

Bridged 4Ω: 150W RMS x 2

Frequency Response

26Hz - 22kHz

Signal-to-Noise Ratio

106dBA, Ref 50W @ 4Ω



High-Pass Crossover

12dB/octave Linkwitz-Riley, 80Hz/120Hz/Bypass

Weather-Proof Rating









7.2 lbs


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Warranty Information

We have a 30-day easy return policy for all purchases. 

We provide a shipping label for defective products upon your return request at absolutely no cost to you. Non-defective products will not receive a shipping label and the consumer will be responsible for all shipping costs.

Stinger Off-Road products are warrantied against defects in materials One (1) Year from purchase date. Stinger Off-Road will, at its discretion, replace any products that exhibit defects in materials and/or workmanship during the warranty period. Assessments of defective parts are performed before replacements are shipped or refunds are released.

Please hold on to your order confirmation! All warranty service requires original sales receipt documentation with Order Number. The warranty only applies to the original purchaser.

Note: Products purchased from unauthorized dealers are not covered under warranty.

Warranty Limitations
Units found to have physical or liquid damage caused by use abuse or improper installation may be void of warranty.