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Skar Audio

Skar Audio RP-75.4AB 500 Watt Full-Range Class A/B 4 Channel Car Amplifier

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Availability: In Stock.
Fulfilled by SKAR AUDIO
Arrives Monday, May 11
Order within 17 hours and 42 minutes
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Size: 500 Watt Class A/B Four Channel


Features

  • 500-Watt MOSFET 4-Channel Class A/B Power Car Amplifier
  • RMS Power at 2 Ohms: 125 Watts x 4 Channels
  • RMS Power at 4 Ohms: 75 Watts x 4 Channel
  • User Adjustable Controls: Gain, Variable LPF, HPF, Bass EQ Switch (0, +6, +12 dB)
  • 4 Way Protection Circuitry | Frequency Response: 20 Hz - 20,000 Hz
  • Signal to Noise Ratio: 105 dB

Description

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.

Item dimensions L x W x H: 19.5 x 7 x 3 inches


Manufacturer: Skar Audio


Maximum Supply Voltage: 12 Volts (DC)


Mounting Type: Surface Mount


Brand: Skar Audio


Maximum Supply Voltage: 12 Volts (DC)


Mounting Type: Surface Mount


Number of Channels: 4


Output Power: 500 Watts


Maximum Output Power: 500 watts


Item Dimensions: 19.5 x 7 x 3 inches


Material Type: Aluminum, steel, plastic


Specification Met: FCC


Manufacturer: Skar Audio


Model: RP-75.4AB


Brand Name: Skar Audio


Warranty Description: 2 year limited warranty


Global Trade Identification Number: 18


UPC: 760999042718


Part Number: RP-75.4AB


Item Type Name: Car Amplifier


Item Weight: 7.4 Pounds


Unit Count: 1.0 Count


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, May 11

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews

    • One of best entry level amps.
Size: 1200 Watt Class D Monoblock
This amp is one of those “budget but actually hits” type of pieces. If you’re trying to get solid bass without emptying your wallet, it does the job. First off, the power is legit. Rated at 1200W RMS at 1 ohm, and it actually gets close to that in real use. It’s more than enough for a daily system and will push your subs hard if everything is wired right. The bass hits strong and punchy. Not competition clean, but definitely loud enough to feel it in your chest. Perfect for a daily driver setup. Now… let’s be real: The sound quality is average. It’s not trash, but it’s not some high-end SQ amp either. This is more about loud bass than perfect clarity. The amp also runs a little hot if you’re pushing it hard for long periods. Nothing crazy, but don’t treat it like it’s bulletproof. And like always with Skar, your electrical matters. If your voltage drops, this thing is gonna act up. It’s not forgiving. Cons: Sound quality is just okay Can run warm under heavy use Not built for abuse or competition setups Needs decent electrical to perform right Pros: Strong real-world power for the price Hits hard for daily bass Affordable and easy to find Simple setup, good for beginners Overall: If you want loud, affordable bass, this amp delivers. It’s not fancy, it’s not super clean, but it works and it hits. Just don’t expect miracles, and don’t wire it like a caveman. Treat it right, and it’ll treat you right. ... show more
Reviewed in the United States on March 18, 2026 by Juan Muniz
    • Insane bass for the money, easily pumps a pair of 12s
Size: 1500 Watt Class D Monoblock
Review Image by John
Review Image by John
Review Image by John
Review Image by John
Review Image by John
I’m running the Skar Audio RP-1500.1D on two Pioneer TS-A3000LS4 12" subs (4Ω SVC, 400W nominal each). Wired in parallel for a 2Ω load, this amp is rated 930W RMS @ 2Ω, which is basically perfect for this setup, and it absolutely slams. What I like: Hits HARD, stays clean: Bass is tight and punchy, with way more output than I expected from a “budget” mono amp. Easy to dial in: The onboard controls (gain/LPF/subsonic) make it simple to get the subs blended without sounding boomy. Remote bass knob included: Super convenient to tame it for everyday driving, then crank it when you want to show off. Solid build / practical features: 4-gauge power/ground terminals and protection circuitry give peace of mind once everything’s installed properly. Fits nicely in a tight space! Worth noting: Like any real sub amp, it rewards a solid electrical setup (good power/ground, clean signal, proper tuning). Once it’s set correctly, it just goes. If you want strong, chest-thumping bass without spending crazy money, this thing delivers. My two TS-A3000LS4s kick HARD on this amp and it’s been a great match. ... show more
Reviewed in the United States on December 30, 2025 by John
    • Quality amplifier
Size: 1200 Watt Class D Monoblock
Quality built amplifier for the price, straight forward installation
Reviewed in the United States on March 25, 2026 by Sam
    • Amp
Size: 1200 Watt Class D Monoblock
Review Image by Jacob
Only problem I have, is to tighten up the wires, you have to have a specific Allen tool that comes with the amp. I’d rather use a flat head. But the amp is great! Looks great! Works wonderful
Reviewed in the United States on March 3, 2026 by Jacob
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Worth every penny
Reviewed in the United States on March 3, 2026 by Donovankimber
    • Can’t go wrong
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Perfect power and great quality.
Reviewed in the United States on April 24, 2026 by Sal
    • Very solid amp
Size: 1200 Watt Class D Monoblock
I have two fosgate P3 D-4. 600 watt each. I’m using sealed boxes and so far no complaints. Hit very solid bringing back sweet memories of my youth😂. I’m 54. A friend of mine recommended Skar as I have been out the car system for over 10 years. I thought I was keeping it moderate at 1/3 but goodness it is rattling my house windows. So far no heating issues, I played it one night for about 4 hrs straight. I have a 45 minute drive to work and was getting kind of bored now I seem to drive my work car everywhere. I have a bmw 428 two door coupe with back seat delete so the subs are in that spot. No rattling just solid bass with two Skar tweeters. I haven’t changed the head unit, and everything is just hitting clean and solid. Remote is a plus. ... show more
Reviewed in the United States on March 19, 2026 by Terminatah
    • What gives , mine is actually MORE powerful?
Size: 1000 Watt Class A/B 4-Channel
Not sure whats up! Not complaining, but lil amp meter say the reason my headlights lights are dimming ALL THE WAY and car stumbles at idle/stoplights on this amp is because its a FRICKEN BEAST! The reality is I need a new battery. ..and optimally a second now for the amp as i have just read.....lol. TY Skar. For supporting the battery and isolator industry. ... show more
Reviewed in the United States on January 28, 2026 by Mr Frosty

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