RP-75.4ABM | 500 Watt 4-Channel Marine Amplifier

  • Skar Audio RP-75.4ABM 500 Watt 4-Channel A/B Marine Amplifier - Front View

RP-75.4ABM | 500 Watt 4-Channel Marine Amplifier

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Skar Audio designed the RP marine series specifically for marine and power sport applications. The full-range RP-75.4ABM is the perfect solution for anyone seeking excellence on the open water. Capable of powering multiple sets of component, pro audio, or coaxial speakers, it packs the power that will allow your speakers to come alive. This extremely efficient, Class A/B, 4-channel, MOSFET amplifier is fully marinized with a water/rust proof coating on the PCB and mechanical casing. The RP-75.4ABM is conservatively rated at 500 Watts RMS and achieves total amplifier efficiencies over 65%. Versatility is this amplifier's middle name, with an array of adjustable user controls such as the gain, LPF, HPF, crossover, and bass eq. Featuring a high-speed MOSFET power supply, 4-way protection circuitry, advanced electronics, and other internal high quality components, the RP-75.4ABM shines when compared to anything in it's class when it comes to power and reliability. The class A/B circuitry equipped in this amplifier allow it to reproduce extremely clean output, for the best possible sound on your boat.


*Skar Audio always recommends professional installation for all of our products.*


*Never mount amplifiers directly on the enclosure*



  • Skar Audio RP-75.4ABM 4-Channel Full-Range Marine Amplifier
  • 2 Ohm Stereo Stable Class A/B 4-Channel Amplifier
  • 4 Way Protection Circuitry: Thermal, Voltage, Speaker, DC
  • RMS Power @ 4 Ω: 75 Watts x 4 Channels
  • RMS Power @ 2 Ω: 115 Watts x 4 Channels
  • RMS Power @ 4 Ω (Bridged): 250 Watts x 2 Channels
  • Fully Marinized with Waterproof Coating on Circuit Board & Rust Proof Painting on Mechanical Case
  • Stainless Steel Hardware
  • High-Speed MOSFET Power Supply
  • Soft Turn on Circuit
  • Frequency Response: 20Hz~20kHz
  • Signal to Noise Ratio: 105dB
  • Damping Factor: 150<
  • Low Pass Filter (Variable): 50Hz~500Hz
  • High Pass Filter (Variable): 20Hz~5kHz
  • Input Sensitivity: 6V~0.2V
  • Bass Boost: 6~12db
  • Efficiency @ 4 Ω: >65%
  • THD @ 4 Ω: <0.1%
  • Fuse Rating: 60 Amp
  • 8 Gauge Power and Ground Inputs
  • Amplifier Dimensions: 13.78" (Length) x 6.3" (Width) x 2.2" (Height)

Customer Reviews

Based on 1 review
RP-75.4AB/500 watt 4channel marine amplifier

Arrived fast! Excellent packaging. Amp looks and feels very sturdy. Haven’t had the chance to power it up yet. Waiting on more Skar products to arrive for a project I am currently building. Got the Amp to power 4-5.25tx Skar coaxials. But two thumbs up over here. Very Impressed with Skar Audio.