AudioControl ACX-300.4 4-Channel 300 Watt All Weather Amplifier

SKU: ACX-300.4

Sale price$289.00

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Product Highlights


  • High-/Low-Level Inputs: The ACX-300.4 amplifier has four built-in 12" RCA inputs that can handle both high- and low-level input signals, giving you flexibility for different audio setups.

    • Low-Level Input Range: 500mV - 6Vrms
    • High-Level Input Range: 1Vrms - 12Vrms

  • Input Mode: A 2-way switch allows you to choose whether one pair or both pairs of input channels will be used to power all four output channels.

  • Crossovers: The amp includes two 12 dB/octave Linkwitz-Riley high-pass filters with a 3-position switch to adjust the crossover point (80Hz, 120Hz, or Bypass).

  • Gain Maximized LEDs: Each pair of channels on the amp has its own Gain control to set the overall output level. Maximized LED indicators show when the output signal reaches its best performance level, preventing distorted signals to your speakers.

  • GTO (Great Turn On) Signal Sense: If you're connecting the amp to a factory stereo or an aftermarket unit without preamp outputs, the GTO Signal Sense circuitry can turn on the amp when an audio signal is detected and turn it off after a period of no signal input.

  • All-Weather Construction: The ACX-300.4 is built to withstand outdoor environments and has an IPX6 waterproof rating and a removable cover-plate to protect controls and LED indicators from dust and moisture ingress.

  • Wire Harnesses: The amp includes built-in wire harnesses for added weather resistance, covering audio inputs, speaker outputs, power/ground/remote connections, and an option to create a custom power/ground harness.

  • Mounting: Built-in mounting flanges and pre-drilled holes offer versatile mounting options, and the amp comes with screws for mounting.


Experience the ultimate in audio versatility with the AudioControl ACX-300.4 amplifier, featuring four 12" RCA inputs accommodating both high- and low-level input signals, a 2-way switch for customized input channel usage, and precision tuning with Linkwitz-Riley high-pass filters and adjustable crossover points. Maximized LEDs ensure optimal performance levels, while the GTO Signal Sense circuitry automatically activates the amp and conserves power. It is built to withstand harsh outdoor conditions and boasts an IPX6 waterproof rating, a removable cover plate, and weather-resistant wire harnesses. With versatile mounting options and included screws, the ACX-300.4 is the ideal choice for premium sound performance in any environment.

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

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 no cost. Non-defective products will not receive a shipping label and the consumer will be responsible for all shipping costs.

Stinger products are warrantied against defects in materials One (1) Year from purchase date. Stinger 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.

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