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Compact silver marine amplifier with four-channel terminals and weatherproof casing

Audiocontrol

Audiocontrol ACX-300.4 Marine Amplifier 50W x 4

SKU CH-WN3Z-08NGK

Four-channel Class D marine amplifier delivering 50 watts RMS per channel at 4 ohms with IPX6 weather resistance

  • Amplifier classClass D
  • Amplifier channels4 Channels
  • Product typeMarine Amplifier
  • All-weather durability from IPX6-rated construction
  • 50 W x 4 RMS at 4 ohms for clear output
  • 75 W x 4 RMS at 2 ohms for extra headroom
  • 150 W RMS bridged per pair for flexible subwoofer use
  • Installer-friendly quick-connect wiring speeds up the job

All-Weather Marine Amplifier

The AudioControl ACX-300.4 is a four-channel Class D amplifier built for boats, ATVs, motorcycles and other open-air vehicles. It delivers 50 watts RMS per channel at 4 ohms or 75 watts RMS at 2 ohms, with a bridged option of 150 watts per pair. The IPX6 rating confirms protection against powerful water jets for reliable operation in wet environments.

GTO Signal Sense and Flexible Inputs

GTO Signal Sense automatically turns the amplifier on when it detects an audio signal, removing the need for a separate remote wire. High and low-level input modes accept both speaker-level and preamp sources up to 12 Vrms. Switchable four and two-channel input modes let you run a full four-channel system or bridge channels from a two-channel source.

Linkwitz-Riley Crossover and Heavy-Gauge Connectors

Built-in 12 dB/octave Linkwitz-Riley crossovers offer 80 Hz, 120 Hz and bypass settings to tailor frequency response for marine speakers. Frequency response spans 26 Hz to 22 kHz with 0.2% THD+N and a 106 dBA signal-to-noise ratio. Heavy-gauge quick-connect wiring terminals simplify installation and resist vibration in rough conditions.

How it compares

Measured against everything we stock in Boat Audio & Electronics, at today’s prices. Recalculated every night.

Price $273.99
Pricier than about 89% of the 312 comparable items (median $69.49).

Specifications

Product
Brand nameAudioControl
Product typeMarine Amplifier
Audio & video
Speaker unit sizeOther
Amplifier channels4 Channels
More details
Amplifier classClass D

Questions about this item

How often will the IPX6 seals need checking or replacement on the ACX-300.4?

The IPX6 rating protects against heavy water spray; the sealed chassis has no user-serviceable seals, so no scheduled replacement is required under normal marine use.

What limits sustained output first on the ACX-300.4 — thermal protection or voltage drop?

The Class D design and IPX6 enclosure manage heat efficiently; continuous 50 W × 4 RMS at 14.4 V is rated without thermal shutdown, so voltage stability at the supply becomes the practical limit.

How much heat and noise does the ACX-300.4 produce when running all day at 50 W × 4?

Class D efficiency keeps the compact IPX6 chassis cool enough for all-day 50 W × 4 RMS operation with no fan, so audible noise is limited to the source material.

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