Best Car Amplifier 4-Channel

If you’re an audiophile looking to upgrade the sound system in your car, a 4-channel amplifier is a great choice. These amplifiers allow you to power your front and rear speakers separately, giving you precise control over the sound in your vehicle. Finding the ideal solution for your needs might be difficult, though, because there are so many available.

That’s why we researched, tested, and used a variety of 4-channel amplifiers to bring you this comprehensive guide. We’ve considered factors like power output, sound quality, reliability, and value to help you make an informed decision.

Top 8 Best Car Amplifier 4-Channel 

  • Best Overall: Rockford Fosgate R2-500X4
  • Runner Up: Pioneer GM-A6704 4-Channel Bridgeable Amplifier
  • Best Power Output: Skar Audio SKv2-100.4AB Car Speaker Amplifier
  • Best Value for your Money: Skar Audio RP-75.4AB 4 Channel Car Amplifier
  • Most Versatile: Alpine KTP-445U 4-channel Amplifier
  • Best Budget: Taramps TS400X4 Class D Car Amplifier
  • Most Durable: Rockford Fosgate R300X4 Prime 4-Channel Amplifier
  • Best Lightweight: Kenwood KAC-M3004 Amplifier

1.  Rockford Fosgate R2-500X4- The Best Overall car amplifier 4-channel

 Key features

Resolutions: 6.8 x 10.1 x 1.9 inches

Weight: 4.97 pounds

Output power: 500W

Impedance: 4Ω

The Rockford Fosgate R2-500X4 Prime 500-Watt 4-Channel Amplifier is a compact yet powerful amplifier that delivers power and bass on demand. This full-range class-D 4-channel amplifier is packed with features and performance. This amp is extremely efficient thanks to its class D technology, which reduces demand on the vehicle’s electrical system. It can deliver 250 watts x 2 @ 4Ω Bridged/Mono.

The R2-500X4 also features C.L.E.A.N. Additionally, it has fully adjustable 12 dB/octave high and low pass Butterworth crossovers, balanced differential inputs with RCA pass-through outputs, high-level input capability, defeat able auto turn-on circuit, and top-mounted controls.

The R2-500X4 Prime 500-Watt 4-Channel Amplifier is the perfect addition to any car audio system. Whether you’re looking for power and bass on demand, or simply want to improve the overall sound quality of your car, this amplifier is sure to deliver.

  • Extremely efficient with class-D technology
  • C.L.E.A.N. circuitry for adjusting gain settings
  • Fully adjustable crossovers, balanced inputs, and RCA pass-through outputs
  • High-level input capable and defeat-able auto turn-on circuit
  • Top-mounted controls for easy access
  • The bass knob is not present

Why Buy:

Rockford Fosgate R2-500X4 Prime 500-Watt 4-Channel Amplifier is a powerful and efficient amplifier with features such as C.L.E.A.N. circuitry, Punch EQ, and adjustable crossovers.

2. Pioneer GM-A6704 4-Channel Bridgeable Amplifier with Bass Boost- Runner Up

Key features

Resolutions: 14.1 x 8.5 x 2.4 inches

Weight: 4.9 pounds

Output power: 1000W

Voltage: 12 volts

The Pioneer GM-A6704 is a 4-channel bridgeable amplifier with a bass boost that offers a maximum power output of 1000 watts. This powerful amp features an automatic signal sensing and turn-on function, making it easy to use and convenient for any car audio setup.

 The variable high pass filter allows for optimal sound quality, while the adjustable bass boost allows for customizable sound preferences. The compact design of this amplifier allows for flexibility in installation, making it perfect for use in various car cabins.

 The Pioneer GM-A6704 is a top-of-the-line choice for those looking for high-power performance and flexibility in their car audio system. The integration of advanced technology and superior performance in a space-efficient size makes this amplifier a must-have for any car audio enthusiast.

In summary, the Pioneer GM-A6704 is a powerful and versatile 4-channel bridgeable amplifier with a frequency response of 20 Hz to 20 kHz, capable of covering the entire audible spectrum. It has a high pass filter that allows you to adjust the cut-off frequency between 40 Hz to 500 Hz, and an adjustable bass boost feature that gives you the option to increase the low-end level by up to 12 dB. The GM-A6704 is a great choice for anyone looking for a high-performance amplifier with advanced features.

  • The high power output of 1000 watts
  • Automatic signal sensing and turn-on
  • Variable high pass filter
  • Adjustable bass boost
  • Compatible with both regular speakers and subwoofers
  • Can be bridged into a 2-channel mode
  • Bulky design limits mounting options

Why Buy:

The Pioneer GM-A6704 offers high power output, automatic signal sensing, variable high pass filter, adjustable bass boost, and a wide frequency response making it a versatile and powerful choice for car audio enthusiasts.

3. Kenwood KAC-M3004 Amplifier- Best Lightweight

Key features

Resolutions: 6.69 x 3.15 x 5.91 inches

Weight: 2.2 pounds

Output power: 600W

The Kenwood KAC-M3004 is a compact and powerful 4-channel amplifier that delivers high-quality sound in any application. With a peak power of 600 watts and RMS power of 50 watts x 4 at 4 ohms or 75 watts x 4 at 2 ohms, this amplifier is capable of delivering clear and powerful sound.

The KAC-M3004 is marine-certified and features a conformal-coated marine-grade circuit board, making it ideal for use in cars, boats, ATVs, and UTVs. The amp also features a KENWOOD Triangle Indicator Light, 3-Way Protection Circuitry, Balanced Inputs, Speaker-Level inputs, and selectable crossover modes.

The compact size of this amp allows for easy installation in almost any vehicle, and its versatility makes it a great option for powering a variety of audio setups, including powering a pair of subs in 2-channel mode and sending 150 watts to each subwoofer. Overall, the Kenwood KAC-M3004 is a great choice for anyone looking to upgrade the sound in their vehicle or other audio application.

  • Compact size
  • 600W output power
  • Versatile use for car, marine, and Powersports applications
  • Digital amplifier for improved efficiency
  • May not have enough power for larger sound systems

Why Buy:

Compact size, 600W power, versatile use, and digital amplifier make Kenwood KAC-M3004 a great choice for enhancing car, marine, or Powersports audio systems.

4. Rockford Fosgate R300X4 Prime 4-Channel Amplifier- Most Durable

Key features

Resolutions: 13.1 x 6.7 x 1.98 inches

Weight: 7.5 pounds

Output power: 300W

Voltage: 12 volts

The Rockford Fosgate R300X4 Prime 4-Channel Amplifier is a versatile and powerful option for enhancing the audio in your car, boat, or Powersports vehicle. The amplifier accepts both high-level and RCA-level input, making it compatible with a wide range of sources. The cast aluminum heatsink with top-mount controls ensures that the amplifier runs cool even under heavy use, and the 12dB/octave crossover allows you to fine-tune the sound to your preferences.

The R300X4 features a Class A/B circuit topology, which provides a balance of efficiency and power output. The 0/6/12 dB on-board Punch EQ Control allows you to adjust the bass boost to your liking, and the 2/4 channel input switch lets you use the amplifier in a variety of configurations. The high-level input (4-pin) allows you to connect the amplifier directly to the speaker outputs of a factory head unit, and the separate front and rear gain control let you adjust the balance of the sound to your liking. The Real-time output and power supply thermal sensing allows you to monitor the amplifier’s performance and protect it from overheating.

The R300X4 also includes 4-gauge power and ground connectors and a MOSFET power supply, which provides stable and efficient power delivery. With overcurrent and short circuit protection, the R300X4 is built to withstand the rigors of the road and provide you with clean, loud, and reliable sound for years to come. The Rockford Fosgate R300X4 Prime 4-Channel Amplifier is a great choice for anyone looking to upgrade their car, boat, or Powersports audio system.

  • Compact size
  • High power output
  • Efficient cooling system
  • Variable crossover and equalization controls
  • Lacks built-in Bluetooth connectivity

Why Buy:

Rockford Fosgate R300X4 Prime 4-Channel Amplifier provides high power output, efficient cooling, variable crossover, and equalization controls in a compact size.

5. Skar Audio RP-75.4AB 4 Channel Car Amplifier- Best Value For The Money

Key features

Resolutions: 19.5 x 7 x 3 inches

Weight: 3.75 pounds

Output power: 500W

The Skar Audio RP-75.4AB is a powerful and efficient 4-channel class A/B full-range car amplifier. It is capable of powering an entire aftermarket upgraded speaker system in a vehicle, providing enough power to bring your speakers to life. The amplifier features a high-speed MOSFET power supply, premium grade internal components, as well as 4-way protection circuitry, ensuring it operates at the highest levels of performance for hours on end safely.

 With a depth of adjustable user controls such as gain, low-pass filter (LPF), high-pass filter (HPF), crossover, and bass EQ, this amplifier is extremely versatile and can be used in various applications. These advanced user controls allow you to dial in your sound 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 amplifies your audio signal with maximum clarity and sound excellence, all while being extremely efficient. The RP-75.4AB comes with 8 gauge power and ground input terminal connections for maximum current flow, RMS power at 2 ohms is 125 watts x 4 channels, and RMS power at 4 ohms is 75 watts x 4 channels. 

The frequency response of the amplifier is 20Hz – 20,000 Hz and the signal-to-noise ratio is 105 dB. With 4-way protection circuitry, high-quality sound, and advanced user controls, the Skar Audio RP-75.4AB is the perfect choice for audiophiles who want to enhance their car audio experience.

  • High power output
  • Efficient class A/B circuitry
  • Advanced user controls
  • 4-way protection circuitry
  • High-speed MOSFET power supply
  • Premium-grade internal components

  • Only work with speakers that have a lot of power

Why Buy:

 Skar Audio RP-75.4AB contains high power output, efficient class A/B circuitry, advanced user controls, 4-way protection circuitry, premium grade components, and 8 gauge power and ground input terminal connections for optimal performance and sound excellence.

6. Alpine KTP-445U 4-channel AmplifierMost Versatile

Key features

Resolutions: 10 x 8 x 4 inches

Weight: 2.42 pounds

Output power: 45W RMS/channel

The Alpine KTP-445U is a compact and powerful Class D amplifier that is designed for use in both factory and aftermarket car audio systems. It features a universal plug that allows you to easily connect the amplifier to your receiver, whether you’re using RCA outputs or speaker-level wiring.

The amplifier runs off the same power circuit as your receiver, making installation quick and easy. With 45 watts RMS per channel at 4 ohms, the KTP-445U delivers plenty of power to drive your speakers and give you the high-quality sound you’re looking for. This 4-channel power pack amplifier is ideal for those who want to upgrade their car audio system without having to make significant changes to their factory setup.

The compact size of this amplifier makes it easy to install in tight spaces, and the universal plug makes it versatile, and suitable for any car audio system. The KTP-445U is a great choice for those who want to add more power and clarity to their music while keeping the installation process simple.

  • Compact size for easy installation
  • Universal plug for versatility
  • Runs off the same power circuit as the receiver
  • Delivers 45 watts RMS per channel at 4 ohms
  • No built-in crossover

Why Buy:

The Alpine KTP-445U is a compact, powerful, and versatile 4-channel amplifier that is ideal for upgrading car audio systems without significant changes to the factory setup.

7. Skar Audio SKv2-100.4AB Car Speaker Amplifier- Best Power Output: 

Key features

Resolutions: 17.13 x 9.16 x 2.5 inches

Weight: 14.7 pounds

Output power: 800W

Voltage: 14.4 volts

The Skar Audio SKv2-100.4AB is a high-performance, multi-channel class A/B speaker amplifier that is designed to deliver exceptional sound quality and power output. With a conservative rating of 400 watts RMS power (100 watts x 4 channels) and a max power output of 800 watts (200 watts x 4 channels), this amplifier is more than capable of powering an entire vehicle’s audio system. Whether you’re looking to power component speakers, pro audio speakers, or a mix of both, this amplifier is a perfect choice.

In addition to its extreme performance capabilities, the SKv2-100.4AB also features an advanced heatsink design for maximum cooling, as well as 4-way protection circuitry that allows the amplifier to operate efficiently at peak output levels for hours on end. With the built-in user control panel, you’ll have full control over your amplifier with variable adjustment tunings for gain level, subsonic filter, high-pass filter, low-pass filter, and crossover switch. 

The SKv2-100.4AB also has RCA outputs, allowing you to easily daisy chain multiple amplifiers together. With 4-gauge power and ground input terminals, this amplifier allows for maximum current flow and higher power output. Overall, the Skar Audio SKv2-100.4AB is the ultimate choice for those seeking the best amplifier to power their “daily driver” sound stage.

  • High power output
  • Quality internal components
  • Advanced cooling design
  • User control panel
  • RCA outputs
  • Large power input terminals
  • A bit heavy

Why Buy:

The Skar Audio SKv2-100.4AB offers high power output, advanced engineering enhancements, advanced cooling design, a user control panel, RCA outputs, and large power input terminals. It’s a great choice for those looking for a high-performance and versatile car amplifier.

8. Taramps TS400X4 Class D Car Amplifier- Best Budget

Key features

Resolutions: 6 x 6 x 3 inches

Weight: 1.43 pounds

Output power: 400W


Voltage: 16 volts

The Tramps TS400X4 is a high-performance, full-range 4-channel car audio amplifier that is designed to deliver exceptional sound quality and power output. This amplifier features a maximum power output of 400 watts at 2 ohms.  With its 4 channels, it allows for an RMS power of 100W x 4 channels. Additionally, it features an input sensitivity of 200mV and a signal-to-noise ratio of greater than 90dB, ensuring that you’ll be able to hear even the smallest details in your music.

The TS400X4 also has a frequency response of 18Hz to 30kHz (-3dB) with high pass crossover and low pass crossover of 90Hz (-12dB/8th) that allows you to fine-tune your sound to your liking. The input impedance is 22K ohms, and it has a thermal protection system and short output protection. The amplifier also has a minimum supply voltage of 8 VDC and a maximum supply voltage of 16 VDC.

This amplifier is designed with safety in mind, it has a thermal protection system and short output protection. It also has a low standby power consumption of 0.8A. The Taramps TS400X4 is a great choice for those looking for a high-performance and reliable car audio amplifier.

  • High power output
  • More input sensitivity
  • High Signal to noise ratio
  • Crossover filters
  • Thermal protection system and short output protection
  • Low standby power consumption

  • The filters are not movable

Why Buy:

The Taramps TS400X4 offers high power output, high input sensitivity, high signal-to-noise ratio, crossover filters, thermal protection system, and low standby power consumption, making it a great choice for those looking for a high-performance and reliable car audio amplifier.

Buying Guide for the Beginners:

There are some key factors to consider when choosing the best 4-channel amplifier for your car. These are:

Power output:

 The power output of an amplifier is measured in watts, and it determines how much volume and clarity you can expect from your speakers. Make sure to choose an amplifier with enough power to drive your speakers to their full potential.

Sound quality: 

A good 4-channel amplifier will provide clean, distortion-free sound, even at high volumes. Look for amplifiers with high signal-to-noise ratios and low total harmonic distortion to ensure the best sound quality.


No one wants to spend money on an amplifier that breaks down or performs poorly after just a few months of use. Look for amplifiers from reputable brands with a track record of producing reliable products.


The best 4-channel amplifier for you will depend on your budget and the features you need. Look for amplifiers that offer a good balance of power, sound quality, and reliability at a price that fits your budget.


 In this article, we have compiled a list of the best car amplifier 4-channel, complete with detailed reviews for each one. All of these amplifiers have received high praise for their exceptional sound quality and bass performance. Ultimately, the best choice for you will depend on your personal preferences and your vehicle’s specific needs.

We hope our reviews will give you a good idea of what each amplifier offers and help you make an informed decision. Thanks


Q:1 What is a 4-channel amp good for?

A 4-channel amplifier is good for powering a car audio system with multiple speakers, such as two-way front speakers and two-way rear speakers, by providing independent power to each channel. It allows for a more customized and balanced sound setup.

Q:2 Which class amplifier is best for sound quality?

Class A amplifiers are considered to have the best sound quality among all the classes of amplifiers. They provide the most linear and distortion-free output, which results in more natural and accurate sound reproduction. However, Class A amplifiers are also less efficient than the other classes and therefore typically generate more heat and require larger heatsinks, which may make them less suitable for some applications.

Q:3 What is the highest efficiency amplifier?

Class D amplifiers are considered the most efficient among all the classes of amplifiers, typically achieving efficiencies of over 90%. Class D amplifiers are known for their high efficiency. They work by switching output transistors on and off quickly, allowing for more power transfer to the load with less heat generated. These amplifiers are commonly used in car audio systems, portable audio devices and professional audio applications.












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