Guide on finding the best 4000-watt amp 

Which the best 4000 watt amp? A 4000-watt amplifier is a real powerhouse that can create a soundscape out of your audio system.

We’ll take you on a journey to find the ideal external that fits your needs and goals with our in-depth guide.

Planet Audio PL4000.1D Mono AmpVariable low pass filter
Bass knob and variable bass boost
4000W max output
Designed for 1-ohm load
Monoblock Class D amps
Rockville dB14 Car Audio Amp: the best 4000-watt amplifier4000 watts at peak power output and 1000 watts RMS
High- and low-level RCA inputs
Variable bass boost
Includes a subsonic filter
2-ohm stable
Remote subwoofer control with wired bass remote
Rockville Krypton-M3 Car Mono Amp1-ohm stable
4000W max output
Variable low-pass crossover and variable bass boost
High- and low-level RCA inputs
BOSS Audio Systems AR4000D Mono AmpMonoblock Class D amps
Up to 4000 watts at max power output
Digital amplification
Adjustable bass boost
Designed for 1-ohm load
Hifonics BXX4000.1D Mono Amp4000 watts RMS of max power output at 1 ohm impedance
Class D technology
Bass boost control
1-ohm stable

The best 4000-watt amp on the market

If you’re ready to unleash the full potential of your audio system, read on to find the amplifier that will make your sound dreams a reality.

Planet Audio PL4000.1D Mono Amp

With a max output of 4000 watts, the Planet Audio PL4000.1D Class D Car Amplifier is a powerful device that will enhance your in-car audio experience.

best 4000 watt amp
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The Planet Audio PL4000.1D Class D Car Amplifier is a great option for anyone who wants to get the most out of their subwoofer and overall sound quality because it combines power and adaptability to improve your audio system.


The MOSFET power supply of Planet Audio’s PL4000.1D amplifier lowers power loss and increases efficiency. Because of its 1-ohm stability design, it can run heavy subwoofers constantly without overheating. For twice the power, you can even strap on two PL4000.1D amplifiers.

This amplifier has a variable low-pass crossover to adjust bass frequencies and a variable subsonic filter to safeguard your subwoofers.

It weighs 7.8 lbs and measures 13.9″ x 7″ x 2.26″. Despite its small size, it is rather strong. Furthermore, a 6-year Platinum Online Dealer Warranty is included.


  • High power output (4000 watts peak power)
  • Efficient MOSFET power supply
  • 1-ohm stability
  • Strapping capability
  • Customizable filters and crossovers
  • Compact and lightweight
  • Variable low pass filter


  • Professional installation recommended
  • Power may be excessive for some

Rockville dB14 Car Audio Amp: the best 4000-watt amp

With its remarkable performance and precise bass delivery, the Rockville dB14 4000W Peak Power/1000W RMS Mono 2-Ohm Amplifier is a formidable addition to your car audio system.

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The Rockville dB14 4000W Amplifier is a good option for people looking to improve the performance of their subwoofer and overall audio quality because it is made to offer strong and adaptable amplification for the audio system.


Superior performance is guaranteed by the dB14 amplifier from Rockville, which provides verified Dyno-tested RMS power with low distortion. Connecting to its RCA preamp outputs is very simple.

It is very efficient due to its Optical Coupler Class “D” technology amplifier features and high-speed MOSFET power supply.

The amplifier has a subsonic filter, a 12dB bass equalization, and a fully adjustable 12dB/octave crossover with differential circuitry.

Soft start technology, low-pass and subsonic filters, and remote dashboard subwoofer control are further features.

For your safety and comfort, it also includes a 100A Maxi fuse, a status mode LED indication, and a host of protective features.


  • Dyno Certified RMS power ratings
  • RCA preamp outputs
  • High-speed MOSFET power supply
  • Comprehensive crossover and filter options
  • Remote subwoofer control and 12dB bass knob
  • Compact and sleek design
  • High and low-level inputs
  • Strong protection circuitry
  • Clear and efficient audio performance


  • May be overpowered for some audio systems

Rockville Krypton-M3 Car Amplifier

The Rockville Krypton-M3 4000-watt amp is a good option for people who want to improve the performance and general audio quality of their subwoofer. It is made to provide strong and adaptable amplification for your car audio system.

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With its integrated remote control, the Rockville Krypton-M3 4000W Peak Power/1000W RMS Mono 1-Ohm Car Amplifier is a powerful device that will enhance your in-car music experience.

Your music will sound better than ever thanks to this amplifier’s amazing power output and abundance of features.


The Dyno Certified RMS power ratings of the Rockville Krypton-M3 amplifier ensure accurate and effective performance. It can generate 1000 watts RMS with less than 1% THD when it has 1-ohm stability.

Real-time voltage information is provided by the digital voltage display.

The amplifier has a 12dB bass equalization, a fully adjustable 12dB/octave crossover, and extensive protective circuitry.

For easy modifications while on the road, a remote dashboard subwoofer control is also included.


  • Dyno Certified RMS power ratings
  • 1-ohm stability for powerful bass delivery
  • Digital voltage display for accurate information
  • Comprehensive crossover and filter options
  • Bass boost control
  • Modern design and powerful performance
  • High and low-level inputs


  • May require professional installation for optimal setup
  • May require professional installation for optimal setup

BOSS Audio Systems AR4000D Mono Amp

The BOSS Audio Systems AR4000D Class D Car Amplifier is an excellent option if you want to increase the subwoofers’ performance and create a more immersive music experience.

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If you enjoy loud subwoofers, the BOSS Audio Systems AR4000D Class D Car Amplifier is a strong and effective way to improve the sound quality of your automobile.


With its effective power architecture, this Class D amplifier produces less heat and less power loss. Because of its 1-ohm stability, it can continually run subwoofers that require a lot of power without overheating.

If you wish to connect more than one subwoofer, you can even strap two AR4000D amplifiers together to double the power.

To achieve the optimal bass experience, you may fine-tune your subwoofer’s performance with the amplifier’s variable low-pass crossover, subsonic filters, and variable bass boost features.


  • High power output for impressive subwoofer performance
  • Efficient Class D design minimizes power waste and heat generation
  • 1-ohm stability for continuous power delivery
  • Strapping capability for connecting multiple subwoofers
  • Adjustable bass boost and filters for tailored sound
  • Compact and lightweight design for easier installation


  • May be overpowered for some audio systems
  • A comprehensive feature set may be complex for beginners

Hifonics BXX4000.1D Car Subwoofer Amplifier

With its potent and accurate bass output, the Hifonics BXX4000.1D Brutus Class D Car Subwoofer Amplifier is a great option for anyone looking to improve the sound quality of their car’s sound system.


With its powerful design, the Hifonics BXX4000.1D Brutus Class D 4000W RMS 1-Ohm Mono Car Subwoofer Amplifier is made to provide your car audio system with unparalleled bass performance.

This amplifier enhances your subwoofer experience with its remarkable RMS power output and thoughtfully designed features.

It’s made to go well with your subwoofers and add booming lows to your music and audio content.


With its powerful 4000W RMS power output at 1 ohm, this amplifier makes sure your subwoofers have all the power they require to produce deep, booming bass.

Additionally, it has a subsonic filter that reduces sounds between 15 and 35 Hz, protecting your subwoofers and enhancing audio quality.

Clear, distortion-free audio is guaranteed by a signal-to-noise ratio of greater than 95 dB.


  • Impressive 4000W output power
  • Protection mode
  • Subsonic filter for subwoofer protection
  • Low signal-to-noise ratio (>95dB)
  • Bass boost control


  • Professional installation may be required
  • Power may be excessive for some setups
  • Limited detailed specifications provided

Choosing the best 4000-watt amp

Among the amplifiers mentioned, the Rockville dB14 Car Audio Amp with RCA preamp outputs, stands out as the best choice for several reasons.

High power

With its powerful 4000-watt peak power and 1000-watt RMS at 2 ohms, the dB14 amplifier can power a variety of automotive audio components, including subwoofers. Even at very high volumes, your music will sound clear and powerful thanks to this strong power output.

Dyno-certified RMS ratings

Rockville is a company that values accuracy, as seen by the amplifier’s Dyno Certified RMS power ratings. This indicates that you can rely on it to accurately and consistently supply the stated power. It’s a dependable performance guarantee.

Advanced technology

This amplifier has a high efficiency due to its high-speed MOSFET power supply and Optical Coupler Class “D” technology. This ensures the amplifier lasts a long time by maximizing power output while reducing power waste and heat generation.

Custom sound tuning

A completely adjustable 12dB/octave crossover with differential circuitry is a feature of the amplifier. With this degree of personalization, you may adjust your sound and get the ideal acoustic balance for your tastes.

Comprehensive protection

Numerous safety mechanisms, including overload, short-circuit, and thermal protection, are included in the amplifier.

Even with heavy use, these protections guarantee that the amplifier and your audio components are protected from potential harm.

Remote control convenience

A remote dashboard bass boost control is included to enable last-minute changes. You can quickly adjust the sound quality with this wired bass remote, making driving more comfortable and enjoyable, without needing to reach the amplifier directly.

Compact and sleek design

Even with limited space, the amplifier’s small size guarantees flawless integration into your car’s audio system. Its sleek black finish gives the interior of your car a stylish touch that makes it both practical and aesthetically beautiful.


To sum up, the Rockville dB14 4000W Amplifier is the greatest option because of its high max output, Dyno Certified RMS ratings, cutting-edge technology, personalized sound calibration, extensive protection features, ease of use with a remote control, and small, fashionable design. This amplifier maximizes the quality of your car audio experience by providing an exceptional blend of power, accuracy, and simplicity.

How to choose the best option

The appropriate product for you will depend on your needs, tastes, and financial situation. Every amplifier that we’ve discussed offers a unique collection of characteristics and functionalities. Take into account the following to choose the right one for you.

Power requirements

Think about how much electricity your car’s audio system requires. The remarkable 4000W RMS at 1 ohm provided by the Hifonics BXX4000.1D is ideal if you need the pure power of high power ratings.


Think about the features that are most important to you, such as the protection mode and other features. For instance, the Rockville dB14 has a variety of features for personalizing your sound, including RCA input, remote subwoofer control, and fine-tuning choices.


Make sure the amplifier you select works with the subwoofers and automobile sound system you currently have.


Think about your spending. Select an amplifier that falls within your budget as each of these models may have a different price range.

Warranty and support

Examine the manufacturer’s service and warranty offerings. Extensive warranties are offered for certain products, which might bring comfort.

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In conclusion, your unique requirements and tastes will ultimately determine which amplifier is ideal for you.

Nonetheless, the Rockville dB14 4000W Amplifier sticks out as a fantastic choice for individuals who value great audio quality, powerful bass, and low power consumption in their car sound system.


Here, we are going to answer the most common questions about the best 4000-watt amp for car audio systems.

How many amps is 4000 watts?

The voltage at which a 4000-watt load works determines how many amps it needs. By dividing the power (measured in watts) by the voltage (measured in volts), you can use Ohm’s law to get the current (measured in amperes). For instance, 4000 watts would demand about 33.33 amps at 120 volts (4000W / 120V = 33.33A).

What size amp do I need for a 4000 watt subwoofer?

A 4000-watt subwoofer’s RMS rating and the required sound quality determine the size (power rating) of the amplifier you need. Generally speaking, you want an amplifier whose RMS output is either slightly greater or closer to the subwoofer’s RMS rating to properly match it.

An amplifier having an approximate power output of 3000–4000 watts RMS at the same impedance (ohms) as the subwoofer would be a good fit for a 4000-watt subwoofer.

How many watts should a good amplifier be?

The components of your car’s electrical system and your particular needs will determine the optimal amplifier wattage. An amp should have sufficient power to run subwoofers or speakers without producing distortion. It’s critical to match the RMS ratings of your speakers or subwoofers with the amplifier’s power output.

For speakers, this means supplying 75–1500% of their RMS rating; for subwoofers, the best sound quality may come from an amplifier supplying 50–100% of their RMS rating.

Are higher watt amps better?

Not always. Greater power output from higher-wattage amplifiers may be required to run huge subwoofers or a high-end audio system.

On the other hand, a lower-wattage amplifier can be more than adequate — it can even be more efficient and produce better sound — for smaller speakers or typical listening volumes.

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