RP-75.4AB | 500 Watt 4-Channel Car Amplifier

  • Skar Audio RP-75.4AB 500 Watt Class AB 4-Channel Car Amplifier - Front View

RP-75.4AB | 500 Watt 4-Channel Car Amplifier

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The Skar Audio RP-75.4AB is a powerful, efficient, and highly reliable four channel class a/b full-range car amplifier. Capable of powering an entire aftermarket upgraded speaker system in a vehicle, it packs the power that will allow you to get loud and let your speakers come alive. Featuring a high speed MOSFET power supply, premium grade internal components, as well as 4-way protection circuitry, the amplifier will operate at the highest levels of performance for hours on end safely.


With a depth of adjustable user controls such as the gain, LPF, HPF, crossover, and bass eq, this amplifier is extremely versatile and can be used in so many applications. These advanced user controls will allow you to dial your sound in exactly as you want for perfect clarity, whether running active components or speakers with in-line crossover networks. The class A/B circuitry design of this model allows it to amplify your audio signal with maximum clarity and sound excellence, all while being extremely efficient. Features 8 gauge power and ground input terminal connections for maximum current flow.


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


*Never mount amplifiers directly on the enclosure*



  • Skar Audio RP-75.4AB Multichannel Amplifier
  • Class AB 4 Channel Amplifier
  • 4 Way Protection Circuitry: Thermal, Voltage, Speaker, DC
  • RMS Power @ 2 Ohm: 125 Watts x 4 Channels (14.4v)
  • RMS Power @ 4 Ohms: 75 Watts x 4 Channels (14.4v)
  • RMS Power @ 4 Ohms (Bridged): 230 Watts x 2 Channels (14.4v)
  • MOSFET Power Supply
  • Soft Turn on Circuit
  • Tri-Mode Capable / Bridgeable
  • Frequency Response: 20Hz~20kHz
  • Signal to Noise Ratio: 105dB
  • Low Pass Filter (Variable): 50Hz~500Hz
  • High Pass Filter (Variable): 20Hz~5kHz
  • 8 Gauge Power and Ground Terminals
  • Working Voltage: 8.5V-14.4V
  • Fuse Rating: 60 Amp
  • Dimensions: 14.75" (Length) x 6.25" (Width) x 2.25" (Height)

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Customer Reviews

Based on 16 reviews
Mids N highs.

This is a perfect tweeter amp with an unbeatable price.

Great amp

Work's great given the sound u want to hear

Rp-75.4/500 watt 4-channel car amplifier

Have no complaints love the sound all the power i need for mids and highs in the future i will be using skar audio in my other vehicle....

Skar(ed) for life

Best car audio for your money. Bought 4 amps, 4 sets of door speakers and 2 sets of 12's (evl and vd) so far. I purchased on skars website and also a few items from skars ebay page. I will not buy any other brands unless skar does'nt make what i need. Most other brands out there are truely over rated with inflated prices like JL and kicker. Dont get me wrong, JL and other brands has nice equipment but super over priced compared to Skar. There is a lot of people out there that only know the major brands that we see everyday like in the local stereo shops and whats in most peoples cars like JL, alpine, sony, pioneer, clarion, kicker, orion, hifonic, cerwin vega just to name a few and in my opinion Skar beats them all in performance, cost, quality or all of the above. About 90 percent of the people that i talk to about car audio has no clue of Skar audio until i show them mine. I will spread the word and let the equipment in my cars speak for the company and show everyone that i come in contact with that skar audio is here and growing fast and that im Skar(ed) for life.

Well balanced

I have skar components on two channels at 4 ohms, and skar 6x9's and coaxials running in parallel on the other two channels at 2 ohms and this amp pushes them well with no sweat. The sound it very clean. I put bass blockers on the coaxials so the 6×9's could be pushed had. Its perfect. Skar is a decent brand