What is the Best 4 Channel Amp?

With so many amplifiers reviews on different models, brands, and types out there, it’s natural to feel a bit overwhelmed. Making the wrong decision could cost you time and money! It could even put your speakers/subwoofers at risk! So before shopping for your upgrade, make sure you get all the info you need to make your purchase. In this guide, we walk through some of the best 4 channel amp to get you started on your amplifier upgrade!

External amplifier come with great advantages.  If you’re seeking high volume levels for instance, amplifiers are definitely part of the picture.  Furthermore, if you aim at increasing sound clarity and bass, look no further than adding an external amplifier.

Adding an external amplifier is one of the most economical ways to upgrade your system without changing neither your speakers nor your receiver.

A 4 channel amplifier can really boost the power for both your front and rear speakers. The results you will get is night and day of a  difference in terms of sound quality and volume.

There are plenty of amplifiers out there that are small enough to be installed behind your car’s dashboard,and they’re powerful enough to breathe a new life into your sound system.

>>Click here to see prices, specs and reviews of finest 4 channel amps<<

Any of these amps would be great buys.Much of it comes down to personal taste. Like with any product, you can get some really, really nice amps if you’re willing to spend a bit of cash. Luckily, there really are great products in every price range. Let’s take a look!

BIG POWER, SMALL SIZE : Pioneer – GM-D8604

  • Configuration : 4-channel car amplifier
  • Class : Class D
  • RMS : 100 watts RMS x 4 at 4 ohms (150 watts RMS x 4 at 2 ohms)
  • RMS : 125 watts RMS x 4 at 1 ohm
  • Bridgeable : Yes
  • Max Power : 1,200 watts
  • Features : variable high,low-pass filters ,preamp inputs and outputs
  • Warranty: 1 year


So, we’re now big fans of Pioneer products.The GM-D8604 is a fantastic amplifier,and possibly one of the most stunning we have found.  We have reviewed a few Pioneer products before, and we believe that Pioneer makes great products, and this amplifier is no exception.

One of the most remarkable aspects of the Pioneer – GM-D8604 is its tiny size which makes it very versatile. and its features speak for themselves.

Additionally, the engineering, and the design of this amp couldn’t be more convenient.Its continuous power output stretches up to 100W per channel at 4 ohm impedance,and it goes up to 150W at 2 Ohm.That makes it more versatile in terms of installation as well as performance.

Although this amplifier is a bit highly priced, it’s a good choice for those of you who are in a budget.By that we mean,if you’re building your car’s sound system from scratch and in stages,it would be great to use this amplifier to drive a set of speakers with the front two channels while bridging the rear channels together to drive a subwoofer with up to 300 watts RMS ; Which will result in more bass and high quality sound.Later on you can opt for a mono-channel amp to drive your subwoofer, and switch this 4-channel amp to power all four of your speakers.

To prevent circuit shutdown,Pioneer went the extra step and enhanced its GM series amplifiers with a protection control system that senses the amp’s temperature and automatically moderates input level accordingly.Pioneer definitely took the time to create a great 4 channel amp for anybody looking for a powerful amplifier that can properly power your sound system.


  • Compact structure and versatile
  • Convenient to install and operate
  • Powerful and temperature sensitive


  • Size is a bit on the smaller side

Alpine MRP-F300 4-Channel 300 Watts Amplifier

Alpine MRV-F300 review

  • Configuration : 4-channel amp
  • Class : A/B
  • RMS : 50 watts RMS x 4 at 4 ohms (75 watts RMS x 4 at 2 ohms)
  • RMS : 150 watts RMS x 2 bridged output at 4 ohms
  • Bridgeable : Yes
  • Max Power : 300 watts
  • Features : variable high,low-pass filters ,Bass Equalizer
  • warranty: 1 year

Alpine is a brand that we haven’t discussed much on our site. However, Alpine has made a name for themselves in audio industry.They were established in 1967, and they have been making quality car audio products ever since.They have built everything from car speakers and subwoofers to amplifiers and headunits.

Alpine MRP-F300 is one of the best selling 4 channel amp in its category.It can send up to 50 watts to each of your speakers.It can also be switched to 2-channel or 3-channel mode according to your needs.This amp comes with high-level speaker inputs and flush mount controls that will make the installation an easy and smooth process.

Alpine MRP-F300 has an extremely powerful built-in thermal management system that is monitoring amp’s temperature on continuous basis ,ensuring nonstop performance and amp-level reliability.

Long story short, it’s really tiny and pricey.There are lots of great things about this amp, but unless you’re willing to invest a bit of money , you might consider passing on it for that reason alone.


  • Easy to install and smooth to operate
  • Powerful and doesn’t get hot
  • Compact design and durable


  • No warranty for physical damage

Affordability , Flexibility : Boss PH4.600 Phantom

  • Configuration : 4-channel amp
  • Class : A/B
  • RMS : 240 Watts x 4
  • Bridgeable : Yes
  • Max Power : 2400 watts
  • Warranty : 1 year
  • Features : Soft Turn-On Circuit,Remote Subwoofer Level Control,Input Sensitivity Selector,Thermal Overload & Speaker’s Short Protection

Boss PH4.600 Phantom review

Boss is a Japanese manufacturer that has been specializing in all sorts of musical equipment and accessories since 1973. They have mastered the art of providing amplifiers that bring full, high quality sound.

Boss makes a great, well-rounded collection of vehicle audio components. The Boss PH4.600 is no exception.It is a solid amp for a great price.

Boss PH4.600  made our list for its combination of price and quality.At most retailers,this amp can be found for under $110.With built-in high- and low-pass filters,you can adjust the output and get the best sound possible of your system.You can also dial in up to 18 dB of bass boost which will result in a new dimension added to your listening experience.

One thing to watch out for,however is the temperature.Some reviewers have noted that this amplifier quickly switches to protection mode. Which is a good way to impair the quality of sound you experience in your car.We didn’t have that problem with this amp, but it’s a major quality issue. Just something to look out for.


  • Well constructed and affordable
  • Easy to set up and control
  • Has a protection mode from hot temperature


  • A little big in size

Clean power, Extensive controls : Rockford Fosgate R400

Rockford Fosgate R400 review

  • Configuration : 4-channel amp
  • Class : D
  • RMS : 75 Watts x 4 @ 4-Ohm
  • RMS : 200 Watts x 2 @ 4-Ohm Bridged
  • Max Power : 400 watts
  • Bridgeable : Yes
  • Bass Boost : 18 dB
  • Warranty : 1 year
  • Features : variable high- and low-pass filters,bass boost,
    preamp inputs and outputs

To be honest, we weren’t too familiar with this product prior to using. However, the Rockford Fosgate quickly caught our attention. One of the first things that we noticed were how versatile it is.I mean, if you’ve been missing clean music even at high volume levels,give this amp a try and you’ll be able to notice a day and night difference in terms of sound quality.

Rockford Fosgate R400-4D is a 4-channel amp that can put out 75 watts to each of your speakers,giving them plenty of juice to immerse you in a pleasurable atmosphere.With that being said, you can use this amp’s front channels to power your front speakers,and bridge the rear channels to power a sub with up to 200 watts RMS.You can switch this amp to 2 channel mode and use it to drive a pair of subs as well.

The Rockford Fosgate R400-D is one of the finest 4 channel amps that will give you a premium sound quality experience.At $160,you might find it a bit pricey, however, with all this performance and features, we believe it’s reasonably priced, and it’s worth all the money you spend on it.


  • Very powerful and deliver clean loud sound
  • Easy to install and operate
  • Well built and last for a long time
  • Fits perfectly into small areas


  • Do give a loud hiss sometimes
  • Poor customer support.


  • Configuration : 4-channel amp
  • Class : A/B
  • RMS : 400 Watts x 4 @ 2-Ohm
  • Connections: uses set screw type connectors
  • Features : high-quality sound, frequency adjustment, gain control, and RCA inputs

MTX Audio offers a Class A/B amplifier for high-quality sound with 4-channels and power of 400W. It standout among similar devices thanks to its incredible features including frequency adjustment, gain control as well as RCA inputs. This makes it capable of delivering maximum signal and prevent any form of distortion and noise.

This model includes an extruded aluminum heat sink responsible for preventing the device from overheating and ensures long playing time. Also, its compact design makes it the stress free to install anywhere in your ride.

The unit uses set screw type connectors for the system wires, so no need to purchase additional installation parts. Its dimension and lightweight makes it portable and you’ll be able to carry it from one place to another.

This item small chassis ensures durability, helps reduce vibrations and in turn generates more focused and compressed sound.


  • Delivers high-quality sound and never get hot
  • Compact design and powerful amp
  • Easy to mount and install
  • Durable, light in weight and portable


  • Has a small size
  • Doesn’t come with a warranty

DURABLE, HEAT-PROOF : Rockford Fosgate P600X4 Punch 4 Channel Amplifier

  • Configuration : 4-channel amp
  • Class : A/B
  • RMS : 75 Watts x 4 @ 4-Ohm
  • RMS : 300 Watts x 2 @ 4-Ohm Bridged
  • Max Power : 600 watts
  • Bridgeable : Yes
  • Bass Boost : 18 dB
  • Warranty : 1 year
  • Features : temperature sensitive, bass boost, compact design, and durable

Rockford P600X4is one of the best amplifiers for cars thanks to the highly functional circuit topology and advanced technology. It’s a 600 Watt 4-channel Amplifier and operates at 2-ohms. It is temperature sensitive thanks to its heat sink made of high durability cast aluminum.

This device delivers a power of 150W per channel at 2-ohms and also offers a wide range of connection options. Its compact size makes it easy to place anywhere and adequately covers basic needs by amplifying sound from any source. 

It’s a class A/B amplifier designed for vehicles and features a fully adjustable 12 dB/Oct Butterworth crossovers with differential circuits. Also, it has a MOSFET power supply to keep it working.

This unit is designed to withstand harsh conditions and delivers high-quality sound to make your driving experience more exciting. It has a one year warranty from the manufacturer that demonstrates its quality.


  • Well designed and last for a long time
  • Powers the speaker very well
  • Easy to set up and has nice controls
  • Manual instruction is comprehensive and easy to understand


  • Not suitable for high heat areas

ELEGANT, SMOOTH SOUND : Rockville DB45 4 Channel Amp

  • Configuration : 4-channel amp
  • Class : A/B
  • RMS : 400 Watts x 4 @ 2-Ohm Bridged
  • Max Power : 3200 watts
  • Bridgeable : Yes
  • Bass Boost : 12 dB
  • Warranty : 90 days
  • Features : bass equalizer, variable high- and low-pass filters, frequency adjustment, and Full IC-Controlled Protection Circuitry

From an aesthetic point of view, Rockville DB45 is designed to add an elegant look to your car interior. It’s made of a high-quality black material, with a series of useful connection option on both side. The connection options include bass equalizer, channel input, frequency adjustment, etc.

Considering the size, it’s a compact design and a weight of 13.55 pounds, making it able to occupy little space. This item has incredibly precise temperature control thanks to its automatic optimal air circulation.

It offers a 4-channel maximum power output of 3,200 watts and a frequency response from 10 Hz to 50 kHz. These ensures it deliver good sound without any interference, making it an excellent candidate for amplifying high-sensitivity speakers. 

Also, this amplifier has high input sensitivity that can be switched to the maximum possible volume within a short time. Unfortunately, this device doesn’t have a Bluetooth, so you’ll need to purchase an external receiver to use a Bluetooth connection.


  • Delivers extremely loud and smooth sound
  • Powerful and gives little to no distinction
  • Well designed and durable
  • Easy to set up and configure


  • Warranty duration is too small
  • Customers service isn’t that great


Audio amplifiers remain a necessary complement if you wish to enjoy high-quality sound in your car. This device has advanced technological features like great connectivity and output quality. That’s why we compiled the above items, which we considered the best. This is based on their output quality, construction, performance, and price. And will help you choose the 4-channel amplifier you can turn to the center of your digital entertainment.

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