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

  • Based on 7,780 reviews
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Availability: Only 2 left in stock, order soon!
Fulfilled by SKAR AUDIO

Arrives Monday, Feb 2
Order within 23 hours and 6 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


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


Number of Channels: 4


Output Power: 500 Watts


Specification Met: FCC


Material: Aluminum, steel, plastic


Global Trade Identification Number: 18


UPC: 760999042718


Product Dimensions: 19.5 x 7 x 3 inches


Item Weight: 7.4 pounds


Item model number: RP-75.4AB


Is Discontinued By Manufacturer: No


Date First Available: February 10, 2015


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Feb 2

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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Top Amazon Reviews


  • Insane bass for the money, easily pumps a pair of 12s
Size: 1500 Watt Class D Monoblock
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 Sasha Ski Sasha Ski

  • Great quality
Size: 1200 Watt Class D Monoblock
So far so good. A truly 1 ohm stable amp. Great customer service. Thru a previous experience not on Amazon. But with the company direct. And it wasn’t their fault. That’s on fed-ex. Quality amp at a great price. From someone who has been into car audio for 36+ years.
Reviewed in the United States on January 8, 2026 by Cowboy C

  • Skar Audio RP-1200.1D Review: Bringing My System to Life
Size: 1200 Watt Class D Monoblock
I recently upgraded my car audio setup with the Skar Audio RP-1200.1D Monoblock Class D MOSFET Amplifier, and let me tell you—this amp is a game changer. I paired it with two Sony Xplod 1200W subwoofers that have been in my family for years, and somehow, in 2025, they’re still hitting like they just came out of the box. This amp truly unlocked their full potential, delivering clean, hard-hitting bass that shakes the trunk in the best way possible. The RP-1200.1D doesn’t just claim power—it delivers it. From deep, rumbling lows to tight, punchy kicks, the output is consistently powerful and distortion-free, even when pushed hard. And for the price? It’s an absolute steal. You’re getting serious wattage and reliability without breaking the bank. Beyond just bass, I also have two JBL Concert Series speakers in my front doors, and the clarity is breathtaking. Whether it's crisp highs, smooth mids, or deep lows, my system now has a perfect balance between power and precision. The combination of Skar’s raw power and JBL’s crystal-clear detail has completely transformed my listening experience. If you’re looking for an amp that delivers serious power without draining your wallet, the Skar Audio RP-1200.1D is an easy recommendation. It’s proof that you don’t need to spend a fortune to get rich, room-filling sound that makes every drive an experience. ... show more
Reviewed in the United States on March 20, 2025 by Alejandro Nunez

  • awesome
Size: 2000 Watt Class D Monoblock
literally nothing bad to say about this amp, i loved the way they packaged it because they kept it very safe and in no way of harm. i loved the overall look and quality of the amp. bass knob is pretty cool too and it really bumps. one problem i had with a previous amp was overheating and this skar amp just eats, it doesnt even get hot. highly recommend ... show more
Reviewed in the United States on December 12, 2025 by Melinda Rowland Melinda Rowland

  • Throws hard punches but is NOT GOOD for LOW HZ
Size: 1200 Watt Class D Monoblock
EDIT: I gave this one more star due to the fact this amp does work well and does last. Its a good build quality I did not expect from SKAR. I have used it every day (almost) for the past 9 months, often at near full volume with everything vibrating and flexing, paired with ONE Sundown SA-12. I still stand behind my statement about this not producing very low Hz like I was used to with my old class A/B amp, and it is absolutely noticeable on certain songs. I have done many low Hz tests and this amp just does not hit certain ones. It does get extremely loud though and hits well. That being said, its still a great amp and was built to last under above average consistent usage. I purchased this amp to replace my vintage KOLE Audio amp and wired it to one Sundown SA-12. The SKAR 1200 has very "punchy" bass but does not get very low. My old KOLE amp that had half the power of this hit lows soo good and you could feel the low bass. With this SKAR you do not get that at all, I am very disappointed. For that reason I may be returning this. The only difference I can see is the old KOLE is a CLASS A/B and this SKAR is a CLASS D. Not sure if that has anything to do with my loss of lows but it should not. I have everything tuned correctly and it still misses the low HZ. Back to square 1 now. Any suggestions? All in all this is a decent amp that has power, but if you want something that gets low and has clarity keep looking! ... show more
Reviewed in the United States on June 12, 2019 by KoolCat

  • solid amp
Size: 1200 Watt Class D Monoblock
works good cant ask for better for the price
Reviewed in the United States on December 29, 2025 by Isaac

  • Great product. Cost effective.
Size: 1200 Watt Class D Monoblock
The Skar Audio SP 1200 Amp is an exceptional product that delivers impressive power and performance. Right out of the box, it’s clear that the build quality is top-notch, with solid construction and a sleek design that looks great in any audio setup. In terms of performance, this amplifier packs a punch. It effortlessly drives subwoofers, providing deep, clean bass without distortion, even at higher volumes. The power output is more than enough to satisfy the demands of most systems, whether you're looking for a solid daily driver or something that can handle intense bass-heavy tracks. Installation is straightforward, and the amp has all the necessary controls to fine-tune your sound to perfection. The thermal protection and short circuit protection features offer peace of mind, ensuring your equipment stays safe during long listening sessions. Overall, if you're looking for a reliable, high-performance amplifier at a competitive price, the Skar Audio SP 1200 is an excellent choice. It’s a solid upgrade for anyone serious about their car audio system, delivering great sound without breaking the bank. ... show more
Reviewed in the United States on January 26, 2025 by Ashley S.

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