Home / Audio / Amplifiers / Best 4 Channel Car Amplifier For Sound Quality [2023 Update]

Best 4 Channel Car Amplifier For Sound Quality [2023 Update]


We all know that finding the right amp can be a daunting task. From watts to the number of channels and EQs, it’s hard to make this decision without considering every little detail. But don’t worry – we’re here with help!

Sound is an integral part of any car stereo, and if yours isn’t up to snuff, then the solution might be as close as your amp. Adding an amplifier to your stereo can provide a boost in sound quality and output.

Sometimes you have a car stereo that does not emit the required high-quality volume. With the 4-channel amp, you will be assured of getting clear premium sound from the back and front speaker combinations.

This type of amp will still work for you, even if you have only a subwoofer and two speakers. Moreover, since these external amplifiers are compact, it makes their installation easy. Since there are so many amps, the guide below will uncover the best 4-channel amplifiers.

What to look for when buying a 4 channel car amplifier?

You’ve come to the right place. We know that there are a lot of options out there, and we want to help you find the perfect match for your needs.

The last thing you want is to buy something that doesn’t work well with your speaker system. That’s why our team has done all the research so you don’t have to! Check out our reviews and make sure they fit what you’re looking for before making any purchases.

First you want to identify the number of speakers you have, and then you will be ready to choose the best amplifier for your system. We have some of the most crucial factors to look out for when buying 4-channel amps listed down below:

Watts per Channels

This refers to the amount of power that the amp is able to provide to the speakers via each output channels. A channel basically attaches to one speaker at a time.

A higher notation infers a more reliable amp and vice versa. You have to mind your utility expenses also as a higher ratings infers a higher consumption of power.

Frequency Response

It is the measure of the frequency of the output sound versus that of the input. This metric forms the core of the amp as it forms the primary role of amplifying the sound. You have to be sure that this measure is not only high but also variable for your proper workouts.

Heat dissipation

In the course of tackling the task of amplifying the audio outputs, these appliances do sustain lots of heat. If and when this is left to go on unabated, the pieces of equipment may be damaged considerably. A way out should and must be found.

Low pass filter

Once in a while, frequencies that are higher than average are often produced by the gadget. These frequencies are technically referred to as noise. They do compromise the quality of the audio system output considerably. To combat them, the amp you have in mind has to possess low pass crossovers.

Power Rating

The peak power rating describes the sum total electrical power that the machine requires to operate normally and seamlessly. It is calibrated in the packaging and the main body of the machine. You have to see to it that you settle on a machine whose ratings are affordable for you.

Top 10 Best 4 Channel Car Amplifier For Sound Quality

RankingsNamePrice and More Details
Rockford Fosgate P600X4 Punch – Best 4-channel Amp ClassClick Here
Alpine MRV-F300 Amplifier – Best Sound Quality Click Here
Rockford R300X4 Prime 75 Watts x 4 @ 4-Ohm Car AmpsClick Here
Boss Audio System R1004 – Best Low Budget Class A/B Car AmpClick Here
Pioneer GM-D8604 – Best 4 Channel Amp For The MoneyClick Here

These reviews will get to understand the kind of amp that might be good for you. Worth nothing, you will know what of the things you can consider when buying the one. Below are some of the top 10 best 4-channel amps that you should try out.

1. Rockford Fosgate P600X4 Punch 4 Channel Amp

Rockford Fosgate P600X4 Punch 600 Watt 4 Channel Amplifier

Key Features

  • 300 watts decent power output
  • Differential balanced inputs
  • Best high quality class A.B. amplifier
  • Calibrated system noise levels

The P600X4 is one of the best amps that produce 150W into the four channels at 2-ohms. Most importantly, it is a bridgeable car amplifier that best suits a 4-way or 3-ways full-range system that pairs well with subwoofers.

Arguably, the amp can be combined to offer an immense output. The amplifier is also equipped with an auto turn-on output that eases the setting up process. It turns on automatically once the voltage runs through.

Nevertheless, this amp has an automatic short circuit to prevent accidental burn out. Its customized aluminum heat sink prevents it from heating up at high temperatures. Furthermore, the amp has an input clip indicator and an Optional Remote Punch Level Control.

The good quality amplifier boosts a lot of bass with a sensitivity level of 18dB and a frequency of 45Hz. Nonetheless, the amplifier RCA connectors accept multiple audio signals without the need of a signal converter. It is the best car amplifier to improve sound quality.

2. MTX Audio Thunder75-4 Thunder Series 4-Channel Amp

MTX Audio THUNDER75.4 Thunder Series Amplifier

Key Features

  • 2 Ohm stable with delay soft start system
  • 175 Watts per each amplifier
  • Class AB topology 4 channel car amplifier
  • Install this power pack with ease
  • Selectable bass boost

The MTX Audio Thunder75-4 is one of the best amps that comes with RMS power of 100W at 2-ohm and 75W at 4-ohms. The amp features the best soundscapes with a frequency range of 15Hz to 25kHz. Even with a power output of 400W, you will get less distortion from your car speakers.

Not only is this amp lightweight, but it is also compact and powerful. It has been manufactured to be surface mounted easily, even for vehicles that have smaller spaces. Moreover, the design enables it to handle vibrations and enhances simple hookups.

It has class A/B category that allows it to provide the best output. The amp has an extruded aluminum heat-sink that enables it to stay cool even when you use it for long hours.

It also has an advanced triple circuit protection that ensures that the amp will never burnt-out. The amplifier’s terminal block uses set screw connectors for both ground/power and speakers, making it easier to make strong connections.

3. Rockford Fosgate R300X4 Prime 4 Channel Amplifier

Rockford Fosgate PBR300X2 Punch 4 Channel Amp

Key Features

  • 75 watts decent power output
  • Unique class B/R rail technology
  • Fantastic build quality and amazing power
  • Easy installtion MOSFET design

The Rockford r300x4 prime amplifier is small in size as it measures about 2 inches by 4 inches by 7 inches, making it easier for you to put it under the vehicle’s seat or dash without causing any inconveniences. It has 75W for every channel at a resistance of 4-ohms.

The amplifier has a Butterworth crossover for filtering frequency. It also has a series of high-levels of inputs. When you turn the amp, the lead illuminating lights indicated blue. Over all it produces a crisp sound at the levels you desire thanks to the variable gain control.

Conversely, the lights will illuminate red when the amplifier’s internal components are too hot, a lower impedance is detected, or the amp experiences short circuits. Furthermore, the auto protection feature can shut it down for sometime before it cools down.

As a result, you can mount it under the seat since it will not overheat. Moreover, the amp uses a multi-layer insulated metal substrate that operates with minimal resistance. The amp has an onboard equalization that assists in correcting noise cancellation (acoustical deficiencies).

4. Alpine KTP-445U 4 Channel Power Pack Amplifier

Alpine KTP-445U 4-channel Power Pack Amplifier

Key Features

  • Amp is offering 45 watts at 4 & 2-Ohm
  • 90 watts power bridged powerful amp
  • Easy to install with an aftermarket head unit
  • Unique harmonic distortion with a clean signal

Sometimes, instead of replacing your car’s entire sound system, all that is required is only a little power boost. In such cases, the Alpine KTP-445U amplifier promises to assist all underpowered head units to have extra power.

The amplifier has the letter “U,” which implies that you can pair with any head unit model or brand. This 4 channel car amplifier uses superb design to produce high-quality audio. It allows for under-the-seat mounting since it does not overheat.

It is rated class D and provides 45W of RMS power rating for each channel. You can also bridge it to drive 90 watts x 2 at 4-ohms and 45 watts RMS output per channel. Also, this Alpine KTP-445U super-compact amp can easily fit behind the glove compartment.

It also has additional specifications such as super-low THD, configurable inputs, adjustable and independent high pass filters. The compact amplifier has variable low pass crossover with a sensitivity that ranges between 0.2V to 4V.

5. Boss Audio R1004 4-Channel Compact Amplifiers

BOSS Audio Systems R1004 4 Channel car amplifiers

Key Features

  • 100 Watts at 2-ohm of power ratings
  • Low power consumption RCA input adapters
  • Class A/B amp with enormous power flow
  • Easy to install with enhanced audio quality

With a MOSFET power supply, this Boss amplifier can comfortably drive a power output of 100 watts. Although the power may appear to be small, it is better for most cars than the junky stock system. Every channel can produce 38W. Unfortunately, you cannot bridge the amplifier.

This amp is a class A.B. amp with high-quality linear circuits that can cope with high power outputs. It has a special variable low pass filter that enables the user to control any condition your car subwoofer is exposed to.

Furthermore, it has high and low level inputs that assist it in achieving optimum performance. You can control the output levels of the sub using a wired-in remote. It also has a bass boost function that adds 18 decibels.

Notably, the amp has an automatic shut-off protection feature that prevents it from short-circuiting. The protection mechanism constantly monitors connected speakers to detect electric failures and heat issues.

6. Pioneer GM-D8604 4 Channel Bridgeable Amplifier

New GM-D8604 4 Channel Bridgeable Amplifier

Key Features

  • Amazing 130W with voltage protection
  • Maximum power of 520 watts
  • 94 dB signal to noise ratio
  • Adjustable crossover with 12 dB

With this 4 channel car amplifier, you will not face any challenges finding a space to install it. It can deliver 100W of power for every channel of 4-ohms. It is also bridgeable.

The amp has an advanced design that assures that it will be protected from short circuits, low voltage, and power surges. If you wish to power multiple speakers of your vehicle and a sub, this powerful amplifier is the best option for you.

Therefore, you can combine the two dedicated lines at the back to efficiently power your car subwoofer. As powerful as the GM-D8604 amp is, it is still very compact. It has a variable high and low pass filter that enables you to control any condition your car subwoofer is exposed to.

Furthermore, the amp has low and high-level inputs that assist it in achieving optimum performance. The speaker level inputs are highly versatile, making it possible to fit with any car subwoofer.

7. Planet Audio AC12004 4 Channel Amp

Planet Audio AC1200.4 4 Channel Amp

Key Features

  • Superior 1,200 Watts of max power amp
  • Incredible 450W x 2 RMS of power bridged
  • System is elaborated with class AB topology
  • Platinum 6 year warranty offered by dealer

Planet Audio ac12004 is a class D amp that can easily fit into the tight space behind your dash, or you can mount it adjacent to your main amplifier. The amp produces enough power due to its fantastic build quality.

In this case, the Planet Audio amp is equipped with a MOSFET power supply system to produce a maximum power of 1200 Watts. At 4-ohms, the car amplifier can deliver 113W from every channel, and at 2-ohms, the amp also drives over 200 watts.

It is also possible to bridge the car amplifier to get a higher output of about 450W for two channels at 4-ohms. With a frequency range of 10 to 50 kHz, low and high-pass filters, its signal can remain stable and clear. It is built with higher quality components.

The Planet Audio amp is rated as class A.B., and it has impressive amplification abilities. Notably, it has a black anodized outer shell that is designed for maximum heat dissipation. It also includes variable bass boost filter, variable high pass, and low pass filters. With this 4 channel car amplifier, you will experience minimum distortion at all volume levels.

8. Kenwood KAC-M3004 Compact Digital Amplifier

Kenwood KAC-M3004 Compact 4 Channel Digital Amplifier

Key Features

  • Class D amp for better power output
  • Special AWG16 MOLEX connector
  • Allows 4Ω to 8Ω bridgeable connections
  • Very wide frequency response

The amp includes a power output of 600W. The impressive power output is achieved by venting out 50 watts at 4-ohms and 75 Watts per channel at 2-ohms. Kenwood KAC-M3004 is rated as a class D amplifier with a 90% efficiency ratings.

You can bridge this 4 channel car amplifier to a 2-channel mode so that it drives 150 W for every subwoofer. Its chassis is made of an aluminum casing that houses boards for maximum protection. Its variable crossover ensures that you get more power.

Plus, the amp stays cool when used as it experiences minimal heating. The car amplifier is equipped with 2-pairs of RCA inputs so that you can easily connect the stereo RCA patches at the head unit.

They use conformal coated main Printed Circuit Boards(PCBs) that provide extra layers of protection. Your amp will be protected from damage through the PCB boards since it will make it moisture-proof. It also has an automatic turn-on sensing signal. It has a simple and efficient design that enables it to suit any car.

9. Alpine MRV-F300 4 Channel Car Audio Amplifier

Alpine MRV-F300 Amplifier

Key Features

  • Expect standard 75W peak power ratings
  • Thermal management processors for heat control
  • Class D amp that provide 80% operating efficiency
  • Wide frequency feedback modulation design
  • Unique bass EQ and low impedance power

The alpine MRV-F300 is a class D amplifier with state-of-art power output. Worth noting, the amp drives 50 watts RMS x 4 channels at 4-ohms and 75W into the four channels at 2-ohms.

When bridged, it delivers an output of 150 watts that enables you to hear your favorite music. The car amplifier has a unique enhanced shutdown performance that works efficiently to keep it safe. In this case, instead of the usual shutdown, the amp will continue playing music at the lower output until its power stabilizes.

Therefore, you will not worry that the amplifier will burn out. As a result, individuals who use the amp will be assured of stable performance even when the great amplifier is exposed to strenuous conditions.

Conversely, Alpine MRV-F300 has the best bass boost for speaker level inputs, pre-amplifier, and low-end efficacy. Moreover, you will be assured of easy installation with its small size even if your car has confined space. However, its cover has a blue light that can be annoying, especially when driving at night.

10. Rockville DB45 Multichannel 4 Channel Car Amplifier

Rockville dB45 3200 Watt:1600w RMS 4 Channel Amplifier

Key Features

  • Up to 1,600 watts x 2 multichannel of bridged power
  • They provide full protection and soft start
  • Best adjustable crossover and LED indicators
  • Expect 10Hz to 50Hz frequency response with this amp

The Rockville DB45 amp is one of the best high voltage amplifiers designed to handle power well. It has an IC-controlled circuits with a peak-limiter that ensures that the sound delivered is not distorted. Nevertheless, it has a max power output of 3200W and RMS power of 1600W.

Although the amp is compact, it is ideal for all kinds of vehicles. The amplifier is classified under class A.B. and it has high efficiency specs. Notably, the amp has incredible power handling mechanisms. In this case, it is equipped with a MOSFET circuitry that guarantees high-quality music without any distortions or noise.

Moreover, it has a 12bD octave crossover equipped with differential circuitry. Plus, the amp has high and low-pass filters with a frequency response ranging from 10Hz to 50kHz. You can power up to eight speakers with this 4 channel car amplifier.

The Rockville dB45 amplifier is designed with state-of-art technology so that you love using it. It has LED indicators for indicating the delay, soft start, mute, and mode system. It also has a fully functional remote controller and backlight light so that you can easily use the amp.

Car amplifiers play the roles in improving the sound levels of the car audio. There are two main kinds of amplifiers in vogue today. These are the 4channel and the 2channel, respectively. In our discussions here, we shall peek into these and everything that pertains to them.

Infinity REF-704A 400 Watts – Best Marine Audio 4-Channel Amp

Infinity REF-704A 1000 W Peak 4 channel amp

Key Features

  • Offering 70W RMS of power handling
  • Best aesthetic design amp on the list
  • Marine-grade amp suitable for boats and vehicles
  • Compact size for ease of installation
  • Design to withstand harsh weather conditions

I wouldn’t want your favorite song to be ruined by extreme weather. This power amp is the perfect way for you and others around you to hear music, no matter what! It is a weather-resistant power amp that is great for use in the indoor and outdoor locations pretty fine.

At the same time, it manages higher performances by virtue of converting the sounds exceptionally fine. Particularly, it delivers impressive power that is unparalleled by another amplifier. The output quality is also unmatched by other amplifiers which means this will make every track unforgettable!

You will mainly find it useful for your outdoor applications as it is scarcely hit or destroyed by severe weather. It stands apart from the other  four channel amplifiers in the sense that it can also support five channels. That, of course, makes it quite useful for large-scale engagements and applications.

Its makeup also incorporates the most recent amp topology. Among this topology are the low, all, and high pass crossovers. They let you vary the frequencies as per your unique system tuning needs. What’s more? It pairs and works alongside the Infinity marine products well. That also extends its coverage immensely.

Best 4 Channel Car Amp Buying Guide

An amplifier is an essential part of any car stereo. They increase the power of your speakers by taking the signal from your head unit and amplifying it to a level that can be heard on the other side of town. With so many options out there, we’re here to help you find what you need.

We know how hard it is to make decisions when you have no idea what you’re looking for in an amp. That’s why we created this review with all the information you need before making a purchase decision. You will learn about low distortion, wattage, subs, speaker wire connections and more!

To get your hand on the most suitable 4-channel car amp for you, there are some factors you have to consider. That is given the highly diverse nature of these items, coupled with the many players who are engaged in their production and distribution.

This article will help you identify what to look for when trying the get the best 4-channel amps for your speakers. When you’re trying to combine your first car audio sound system, there are a few key points to know. You will need to determine how many speakers you have on your car’s stereo system.

Then, you should decide what type of speakers or subwoofer you want to add to your car audio system. Although the amp is the most important component, the total amount of speakers would determine the power that you need and how many channels you need also.

The best way to find a great amp is by looking at the specs. You want an amp that has a signal sensing option, high and low pass filter, and power rating. These are all important features to look for in a amps and they will help you find out how much power you need from the four channel car amplifier.

Benefits of using a 4 channel car amplifier

The amplifier is the heart of your stereo system. They take the power from your head unit and amplify it, so you can listen to music at its best. But there’s more to an amp than just power. You want one that has good sound quality, high pass filter, bass boost and frequency response.

Choosing a 4channel amp with a low signal to noise ratio will allow you to have a better experience. A typical 4-channel amplifier is beneficial in this main ways:

Boosts the Audibility of the Audio Output

The amps play the primary role in boosting the audibility of the output of the speakers. That is given their critical role insofar as upping the voltage levels is concerned.

By doing this, they minimize the over-consumption of power yet, at the same time, manage better outcomes overall. A 4 channel amp would also have a better signal to noise ratio.

Minimizes Strains and Ambiguities

By upping the volume of the output, the amps also minimize the strains and the ambiguities that come along. Simply put: you get to hear the loud sound as is rather than struggle to make meaning of the sound volumes. That, of course, leads to better listening on your part.

More Power Per Inputs

Most of the 4 channel amps previously listed on this buying guide, like the P600X4, also come with 75 watts out of 4 channels at 4-ohms. If you are trying to power up your four front and rear speakers, any amp in this list would be a good set up.

In the future, if you’re trying to add a subwoofer to your sound system, then you would probably want to get a 5channel amp. The industry standard when it comes to a 5 channel amp is around 75 watts x 4 and between 100 watts to 500 watts on the filth channel for the subwoofer.

If you want the best possible experience from your car’s speakers, then an amp is for you. It is a great way to boost the output and to get a better sound quality as they make everything louder and crisper. Look for a unit that has a remote control included in their specifications.

Class A/B amplifier vs. Class F/D amplifier

These two classes of amps differ in this regards:

Operational Methods

The class AB incorporates the traits and characteristics of the individual classes of A and B. Full range class D amps, on the other hand, operates on its own, without any input from the other classes. You may nonetheless gain more from the former as it is more comprehensive than the latter.


Generally, Class AB is mainly applicable for the home theater systems as it is able to take on the sophisticated sound technologies well.

You will find class D amplifiers, on the other hand, great for the public events due to the ability to generate truly high loud sounds. Also, you find that for bass sounds engineers typically prefer a class d amp.

4-channels vs. 2-channels amp

Do you want to improve the sound quality of your vehicle? Most users find that 2 channel amps are not enough and later have to upgrade to a 4 series . A 4 series will give you more options when boosting the speakers volume and amplifying the audio signal.

You can also connect up to 4 speakers at once with this device. Plus, it has a wider frequency response than most amps on the market today!

The following are the common differences between these two amperes:

Number of Channels

These two amplifiers differ insofar as how many channels they may accommodate is concerned. The four-channel amplifier, as its name implies, is able to accommodate four channels and hence send the output to multiple speakers at a time.

Its two-channel counterpart, on the other hand, can only work alongside two speakers. However, some bridgeable 4-channel amps will allow you to connect the front and rear speakers into a single channel.

To get the best sound out of your amp, you should stick to one speaker per channel. It allows the amp to provide more power to each speaker. Hence you will get an excellent sound quality and an overall much better listening experience.

Quality of the Sound Output

They also differ in the quality of the output they manage to give off. A four-channel amp typically offers more power than the two-channel counterparts. Only downside is that you might not be able to connect an extra subwoofer.

Similarly, it also consumes a higher degree of energy input. That is understandable owing to its extra power to blast. If your set-up is four speakers and bass, a 5 channel amp would be your best bet.

F.A.Q.s For A 4 Channel Car Amplifier

Let’s take a deep look now at some of the frequently asked questions with regards to this particular topic:

Are class AB amps the best for sound quality?

YES, it is! This class provides a mix of great sound and power efficiency. The end result of this is unparalleled sound quality and output. You have it for the taking if you want to accrue the most audible and reliable sound outcomes that may be accrued at any given time.

Owing to the quality output it generates, this kind of amp is great for the home theaters and the high fidelity sound systems. These include the high-end car stereos and musical appliances that are generally more complicated to handle and engage. They are truly the best in the meantime.

The standard class A amplifier is one in which current and voltage are said to be in phase. This means that the voltage leads the current by ninety degrees. An example of a class AB amplifier could be one where the input stage is biased into a class A region. These high quality amplifiers have a few problems, such as increased distortion or power loss due to bias currents.

What is a bridgeable amplifier?

A bridgeable amp is a type of linear power amplifier. A power amp is a device that takes the audio signal and amplifies it to a level that is high enough for an audio system to produce sound.

Bridgeable amps have two or more channels, meaning they can be placed in parallel with one another so that their volumes are summed together. Bridgeable amps are used to boost low-power signals, such as those coming from a CD player or home theater receiver.

Bridging refers to joining two or more channels of an amplifier and using the same to drive towards a common load. The purpose of this common practice is to generate a sound output that is louder and of higher quality than that which may ordinarily be the case.

It hence goes that a bridgeable amplifier is one that allows for the interconnection of the two or more channels. Not all amplifiers are like this one. If you are intent on bridging the various channels, you must see to it that the one you have in mind allows for the attainment of this eventuality.

What are the best 4 channel amp brands?

There are a ton of amp brands to choose from. From our experience and talking to some of the industry-leading sound engineers, we found that the brands that produce the best amps are the following:

  • Rockford Fosgates
  • Kenwood
  • JL Audio
  • Alpine
  • Boss Audio

Although we did not include an amp from the JL Audio brand, we still consider them one of the top industry leaders when it comes to audio systems. They design great speakers, amps, and subwoofers. Also, this amp article is taylor for those looking for an economical solution when it comes to finding the best 4 channel amp.

Tip: A 4 channel amp will allow you to have a much cleaner set up.


WOW! Our insight into the 4-channel amps comes to an end there. We now hope and pray that you have gained the insight and the head start you need to appreciate these appliances better and even make a more enlightened purchasing decision.

What are you waiting for? Is it not proper for you to move speedily and acquire one for yourself? Unless you buy a high-end vehicle, you cannot enjoy the high-quality you need since even the factory stereo may appear to be subpar.

However, as demonstrated above, there are so many 4-channel amplifiers that enable you to overcome such issues. You must figure out the option that you think is best for your car.

You are now ready to choose the best car amplifiers with 4 channel that fits your needs. Any amp in this list will do the trick, so go back and check the list again. Choose an amp that has an affordable price and that it can power up your speakers.

Last Updated on: January 11, 2023

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