Best 4 Channel Amps in 2017 with Reviews

Amplifier can be simply understood as a sound amplification device which are an integral part of audiovisual systems. Based on your own sounds system goals, you choose a 2-channel amplifier or a 4-channel.

However, not everyone can understand the nature of an amplifier and everything related to them. A variety of designs, features, and brands make buyers a bit dizzy. This article introduces the 5 best 4-Channel Amplifiers for your automobile needs.

Why do we use 4-channel amplifiers?

Adding an external Amplifier is one of the most economical ways to upgrade your sound system without changing the speaker. The difference of an Amplifier is that it’s great to help us enjoy the best sound as possible.

A 4-channel, non-bridge amplifier helps you control the balance and degradation of the speaker. It also makes the bass sound stronger and sharper. You can use a compressor to compress bass and kick for extra force, less and soft knee compression will give soft bass, otherwise, strong and hard knee compression will produce deep bass, inserting gate as you like.

A 4-channel amplifier can accept four inputs, or two inputs with the two others located in the amplifier. Through the bridging process, you can also tweak the speaker smaller than the amplifier having channels at any time. Most 4-channel amplifiers have interference, boost rate, and boost control for each stereo pair.

This allows the amplifiers to operate in bridges, four channels, or three modes of switches. This setting is often mentioned in the 4-channel amplifier document as 4th/3rd/2nd channel activity.

When should you use the 4-channel amplifier?

The purpose of the amplifier is obviously to produce the same output signal, but stronger than its input signal. An amplifier can be used to perform other functions.

The 4 channel amplifier with high quality sound inputs and high power is used a lot in building sound systems, commercial audio office, and that with smaller power is often used in car spaces and yachts on move. In this introduction, I suggest the 5 best types of amplifiers for your car.

How to choose a 4-channel amplifier for cars?

With a variety of designs and suitable for a variety of preferences such as bass deep, high, or low sound, or eliminate the noise from cars. Sound system in the high class cars are quite good, there is little bass. However, the integrated sound system on your car can not satisfy you, so buying an Amplifier is a great option for upgrading your car sound system when you want a better music experience.

When choosing an amplifier for your car, you can rely on the following criteria to fit your needs. For examples, Is the Amplifier durable? Is it resistant to pressure and has it been heated up over long periods of time? Does it come with many other features like bass boost and filter? What are its disadvantages affecting your needs? Does it fit your existing speaker? Or can you replace the new speaker. You should consider the pros and cons of Amplifier before using it.

To give the best sound signal, the head unit must output the largest signal that one or more amplifiers can handle before clipping at the level of common signal reception and playback. One of the most important factors when choosing an amplifier is to check whether the head unit has a pre-amp output.

Most current models have a crossover filter which allows you to customize the highest or the lowest frequencies that the main and subwoofer perform, avoiding the need to reproduce inappropriate frequencies, resulting in sound loss or sound encroachment and allow the volume up without distortion.

Many types of amplifiers also come with an equalizer or tuning available, and the more features the more time a car owner must take to learn to use. Low-cost models have less special features, such as the bass-boost switch, or even nothing. Also, if the head unit already has a pre-amp output, the mentioned customizations are no longer needed.

Benefits of using 4-channel Amplifiers

It’s important to have a good mix of speakers and amplifiers. If you have speakers available, you should choose an appropriate amplifier to maximize the sound quality. In other words, the main speaker is an output for the amplifier.

A common choice for this type of amplifier is to provide power to all speakers (4 speakers), which can be connected in series to create a wide variety of configurations, typically with Class A/B or Class D. Generally, Class D Amplifiers are usually more expensive than Class A/B but all depend on their features.

Comparison: 5 Best 4-channel Amplifiers

Rockford Fosgate R400-4D 400 Watt Full-Range Class-D 4-Channel Amplifier


  • Attracting designs makes you want to expose without hidden installation. Or if you want to install it under the hump of the passenger seat, you will be able to free up enough space.Rockford-Fosgate-R400-4D-Full-Range
  • Protect three stages including thermal flow, over current, and short circuit.
  • Integrate with PEQ (Punch Equalization) +18dB boost at 45Hz
  • Prime R400-4D Amplifier brings high performance through implementation of Class-D circuit, while it can still provide full power to your sound system.
  • This amplifier is optimized for front and rear 4-channel systems so that you can run the mid range/tweeter in the front door (dash) while also running mid range/tweeter in the back door. Fit a mono amplifier for subwoofer and you will have a Rockford Fosgate system that any automobile audio must envy.
  • Increasing the volume of the front speaker is set in half compared to normal, the sound is moderate and not distorted. Coming with it, there is an audio equalizer that makes the sound smoother.
  • The rear channels, bridges to 4 ohms set to about 200 watts, and sound at 1/3 level will give you a great feel in the back of the car. If the frequency is set to less than 100 hertz or the front channel gap stops working, the sound is even better. The punch-eq is set to provide plenty of bass.
  • The advantage of Rockford is its excellent durability and long life cycle.


  • Aluminum heat sink is not hot but still warm
  • No option for 4ohms

Kenwood Compact Automotive/Marine Amplifier 4 Channel – Class D KAC-M1824BT


  • Kenwood low-performance amplifiers are small in size so they fit into the most restrictive areas of installation.Kenwood-Compact-Automotive-Marine
  • Ideal for use in harsh environments.
  • Moisture resistance: The amplifiers also use a glazed government PCB (printed circuit board) that provides extra protection to prevent moisture or moist air which slowly spoil the product.
  • Powered by Bluetooth version 3.0 + EDR working independently help you listen to music more easily with your favorite songs from the phone. When connected to your cell phone or usb, it acts as a typical CD receiver with a capacity of 45 Watts x 4.
  • The remote control with certified IPX-5 waterproof for at least 3 minutes in continuous operation,is directly subject to 12.5L of water per minute from all directions. With this design, it is perfect for ATVs, cars and yachts.


  • Being heated if running for long periods of time

CT Sounds AT-60.4 Class AB 4 Channel Car Amplifier


  • Equipped with class A/B amplifier technology. The A/B classes included in this Amplifier are responsible for removing the noises on move, giving you the best sound experience.CT-Sounds-AT-60-4-Channel
  • The product also comes with low and high filter, meets frequency of 10HZ-50KHZ, adjusts phases perfectly (00 – 1800), adjust voltage (0.2V – 5V), 2 fuses, and others.These combination make the amplifier one of the desirable options for cars. Deformation of about 12.8V is perfect for ensuring sound quality.
  • With 500 watts of efficient Class-D topology, this powerful amplifier has the ability to control turbidity level from 2 Ohms and bass on deck.
  • Standard RCA port will help import MP3 and provide short circuit protection.
  • A sophisticated sound control knob allows you to quickly adjust the desirable sound.


  • Suitable only for small or medium cars.

Rockford Fosgate PBR300X4 Punch 300-Watt Ultra Compact 4-Channel Amplifier


  • Its frame design is smaller than the traditional products (1.53″ x 4.25″ x 6.75″). The hidden installation becomes easier and more flexible than ever.Rockford-Fosgate-PBR300X4-4-Channel
  • Bass is kicked and bass boost is maximized.
  • The lower distortion, the combination of Rockford topology, cycle-by-cycle (a high/low voltage linear topology indirectly connected to high/low ampere linear topology)bring a remarkable power density.
  • With MEHSA³Monopoly patent – Maximum Heat sink application, Rockford Fosgate offers up to five times better heat transfer than traditional FET mounting techniques.
  • Metallic surfaces with insulating layers provide fast thermal dissipation, which allows for extra watts per cubic inch in each output as well as provide stable heat. The higher power handling results in a 20% reduction in the heat resistance, which is good for long periods of time, without being heated.
  • DSM – the industry’s leading thermal dissipation technology, which prevents different chip circuits, reduces interference between them, reduces temperature, and improves operational quality in small designs.
  • High durability


  • Amplifiers coming with a intermediary device make a little noise.
  • Take quite a lot of power because you may need another cap for it.
  • The LED of the Amplifier and the remote control are too bright.
  • No screws accompanied and more additional cost because of need to buy separate wires.
  • Its biggest disadvantage is that there are only 4 ohms which are stable and not bridged.

Alpine MRV-F300 4-Channel Car Amplifier


  • Easy, detailed installation instructions
  • 50 watt RMS x 4 in 4 ohms. Can be switched to 2-channel mode or 3-channel mode as needed.Alpine-MRV-F300-4-Channel-Amplifier
  • High and low filters can be changes(50-400 Hz, 12 dB / octave)
  • The remote control is automatically turned on when using the speaker input
  • Hot fuse: 40A x 1, An overheat amplifier is automatically turned off to ensure safety.
  • The 4-speaker system and the cross-channel setup of up to 80Hz difference give you a full balance of sound without the bass being encroached so the sound is not distorted.
  • The sound equalizes with maximized bass.
  • Good thermal dissipation even in high volume, you can listen to music for a long time.
  • Convenient stacking design for better space saving settings than other compact amplifier designs.


  • The bass has no adjustment and less color, however this is the common situation for automobile amplifiers.
  • No high tuning.
  • Its temperature is kept low so audio quality is at medium range.

Temporary Conclusion

These are five of the best 4-Channel Amplifiers on the market today. Normally, an Amplifier having advantage of no heat dissipation will subject to limitation on the sound quality and an Amplifier having high sound quality will subject to limitation on time for continuous use.

For cars running for long periods of time with the need to listen to audio for hours, the best choice is Alpine MRV-F300 or Rockford Fosgate PBR300X4.For all-terrain cars running in the harsh environment like hot or humid climate, Kenwood Class D KAC-M1824BT is a good choice. They are products that give you a satisfactory sound quality, withstand high pressures and continuous use for a long time without being heated.

For me, the Rockford Fosgate R400-4D is the best, because I do not have the need to listen to music in the car for long periods of time. Instead, I wish it was greatly quality, and Amp Rockford Fosgate was the perfect choice. The sound system comes with high filters, noise cancellation, colorful bass, especially beautiful, durable product.

If you are concerned about the price of Rockford Fosgate that your car is small or medium, choose the CT Sounds AT-60.4, the sound filter and the features of this product also give a very sophisticated sound quality. KAC-M1824BT satisfies most customers.

Through above information, have you chosen your appropriate Amplifier? When choosing your automobile amplifier kit, power output is a very important, interesting factor, but it certainly is not the only factor to keep in mind. Depending on your vehicle, you may want to choose a small or large amplifier, or an easy-to-use multi-channel one.

If you like tuning your car audio, there are a lot of good choices for you. Maybe you want simple sound or complex sound. Finally, almost all Amplifiers support the most commonly used inputs and outputs. However, beware of the low prices, they do not always support the most common inputs and outputs.

Car Electronics