Search  for anything...
Skar Audio

Skar Audio RP-4500.1D Monoblock Class D MOSFET Amplifier with Remote Subwoofer Level Control, 4500W

  • Based on 7,686 reviews
Condition: Used - Acceptable
Checking for the best price...
$439.99 Why this price?
Save $70.00 was $509.99

Buy Now, Pay Later

As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 8 left in stock, order soon!
Fulfilled by SKAR AUDIO
Arrives Oct 22 – Oct 26
Order within 1 hour and 34 minutes
Available payment plans shown during checkout

Recently Viewed

Size: 4500 Watt Class D Monoblock


Features

  • Competition Grade Class D MOSFET Monoblock Power Amplifier
  • Peak Power at 1 Ohm: 7, 000 Watts | RMS Power at 1 Ohm: 4, 500 Watts
  • Stable at 1 ohm | Remote Subwoofer Level Control Included
  • Frequency Response: 20Hz - 250Hz, On-board Bass Boost Control 0-9dB
  • Featuring 4-Way Protection Circuitry and 1/0 AWG Power & Ground Input Terminals for Maximum Current Flow

Description

Skar Audio engineered the RP-4500.1D Class D monoblock subwoofer amplifier to be dominant in both power and reliability compared to anything else on the market in its' class. Designing the most efficient, well built, high quality amplifiers is where we start here at Skar Audio, and that is exactly what is delivered in the RP-4500.1D. This amplifier is competition grade and for the most serious audiophiles seeking extreme levels of power output. The RP-4500.1D is 1-ohm stable and utilizes a wide array premium internal components that make it extremely powerful and reliable - such as its high speed MOSFET power supply and advanced PCB board layout. Conservatively rated at 4,500 watts RMS power at a 1-ohm load, with the capabilities of reaching beyond 7,000 watts at max power output. This amplifier is by far one of the most affordable and powerful competition grade monoblocks on the market when priced per watt, and will exceed your expectations when you hear it bring your subwoofers alive. Furthermore, the oversized 1/0-gauge power and ground terminals found on the amplifier allow for maximum current flow and therefore higher power output and more efficient operation. You'll have full reign over your amplifier with the built-in user control panel, featuring variable adjustment tunings for gain level, bass EQ (0-9 dB), subsonic filter (10-50 Hz), low-pass filter (35-250 Hz), and phase filter (0-180 Degrees). In addition to all the above features, this model also features 4-way protection circuitry, which will give the user the peace of mind knowing they are protected against damage to the amplifier for various reasons - including electrical shortage, overheating, low voltage, and more. This amplifier comes with a remote subwoofer level control (bass knob) allowing the user to have full control over their bass from the front of the vehicle. Present on the RP-4500.1D as well are both input and output RCA connections, allowing the source signal to be daisy chained between multiple amplifiers. The RP-4500.1D is also strappable, featuring an output master/slave input switch.

Item dimensions L x W x H: 22.05 x 8.27 x 2.44 inches


Manufacturer: Skar Audio


Mounting Type: Surface Mount


Brand: Skar Audio


Number of Channels: 1


Item dimensions L x W x H: 22.05 x 8.27 x 2.44 inches


Manufacturer: Skar Audio


Mounting Type: Surface Mount


Brand: Skar Audio


Number of Channels: 1


Output Power: 4.5E+3 Watts


Specification Met: [Inferred Fcc, Possibly Others]


Global Trade Identification Number: 57


UPC: 011922308457


Product Dimensions: 22.05 x 8.27 x 2.44 inches


Item Weight: 20.2 pounds


Item model number: RP-4500.1D


Is Discontinued By Manufacturer: No


Date First Available: December 13, 2017


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Oct 22 – Oct 26

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • 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.
    • Good as new
Size: 3500 Watt Class D Monoblock
Works fine, can’t even tell that it’s used, does get hot kinda quick but works, looks new, even came in an original box. Would recommend
Reviewed in the United States on August 23, 2025 by Larry W
    • Nice Amp
Size: 1200 Watt Class D Monoblock
I purchased this amp to pair with 2 12 inch Skar subs, so far so good. Amp was easy to install, functions well and has plenty of power. I did notice the amp gets quite warm when run for a while so I recommend pairing up a cooling fan. I believe this amp is a great value for the cost.
Reviewed in the United States on July 21, 2025 by Donald
    • Great product
Size: 1200 Watt Class D Monoblock
Working great and plenty of power for my dual 12inch subwoofers
Reviewed in the United States on August 3, 2025 by Robbie O.
    • Hassle *update
Size: 2000 Watt Class D Monoblock
Originally I bought this amplifier in January, I did not put it in my car until middle of February. I hooked it up to one DDX 10" 2ohm speaker and had it running with all the setting turned down. It played fine. I had the settings down in order to not blow my speaker that is rated at 1k watts. About two week later I bought 2 DDX 10 inch woofers for the amp. I ran them at 1ohm on one channel, and they sounded incredible. After breaking in my new speakers I slowly started turning the amp up. A couple days go by and I crank it maybe 80% up and after 10 min of playing the amp goes into protection. The amp was warm but not hot. I figured maybe it overheated. It never turned back on so I contacted Skar. They told me to send the amp back so they could test it for a defect, so I did. They tested my amp and deemed it a factory defect. They said they would send me a new one in 3-5 days. So a couple days go by and I call them back to find out what to update was on my replacement. I was informed that they're out of stock and they're shipment of new amps isn't coming in for 10-15 days. Another 14 days go by and I call them up to see if they received the new amps yet, they told me that they did and they would ship mine out the next day. So finally on day 15 they send out my "new" amp and I get it in the mail shortly after. Today I opened up my "new" replacement amp to find what looks like a refurbished used amp (not even my old one) This amp is dinged up with scratches and just normal wear and tear. I hooked it up and it's working fine as of right now but I have only played it for about 5 minutes as it's late at night. I guess we'll see if this one at least works for the time being but I'm not super happy with this service. Not to mention I was denied a refund for $15 for shipping the amp back to them that they told me was a factory defect. This is the first time I've bought a Skar amp and I'm not too pleased, I loved their speakers and have had many of them but I think now it's time for me to find a new brand to avoid this hassle in the future *update* I've beat the hell out of the refurbished amp and its still holding up. It does go into protection at 100% gain but that might be because I need some tuning. For now it works very well at about 90% gain. It does get very hot when running for a long time so maybe I'll install a electric fan somewhere. Would rate 3.5 stars if I could just because of the pain it was to get. ... show more
Reviewed in the United States on March 30, 2018 by Rajesh R.
    • Good buy
Size: 1200 Watt Class D Monoblock
Powerful for the size
Reviewed in the United States on October 2, 2025 by Darris harmon
    • Skar always has great quality products
Size: 500 Watt Class A/B Four Channel
Great product
Reviewed in the United States on September 19, 2025 by Potimon
    • 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

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...