Best 4-Channel Car Amplifiers – (Reviews & Buying Guide 2019)

Is your current car stereo not producing a high enough sound quality and volume for you? Do you have front and rear speakers too? Then the answer to your problems could be in finding the right 4-channel amplifier for your needs. The best 4-channel car amplifiers are the surest way to get premium sound from the front and back speaker combinations. Even if you have just two speakers and a subwoofer a 4-channel amplifier will still work well for you.

In this article, we will do several 4-channel car amplifier reviews. That way you will get the heads up on what might be a good 4-channel amplifier for you. At the very least it will give you a good idea of what you need to look for in a 4-channel amplifier when you are out shopping for one. Once you purchase and install your new 4-channel amp you will not believe how much better your car stereo sound quality will be.

PRODUCTDETAILS
Rockford Fosgate P600X4 Punch 4-Channel Amplifier

Rockford Fosgate P600X4 Punch Amplifier

  • Price : $$$$
  • Dimensions : 12 x 19.3 x 5.8″
  • Power : 129 Watts x 4 @ 4-Ohms 0° Res
  • Class : AB
  • Weight : 12 pounds
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MTX Audio THUNDER75.4 Thunder Series Car Amplifier

MTX Audio THUNDER75.4 Thunder Series Car Amplifier

  • Price : $$
  • Dimensions : 14.4 x 7.5 x 4″
  • Power : 400 Watts
  • Class : AB
  • Weight : 4.5 pounds
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Kenwood 22154656 Compact Digital Amplifier

Kenwood 22154656 Compact Digital Amplifier

  • Price : $$
  • Dimensions : 6.7 x 3.1 x 5.9″
  • Power : 600 W
  • Class : D
  • Weight : 2.2 pounds
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ALPINE MRV-F300 4-CHANNEL CAR AMPLIFIER

Alpine MRV-F300 Car Amplifier

  • Price : $
  • Dimensions : 13 x 9.1 x 4.3″
  • Power : 640 W
  • Class : D
  • Weight : 5 pounds
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Pioneer GM-D8604 Bridgeable Amplifier

Pioneer GM-D8604 Bridgeable Amplifier

  • Price: $
  • Dimensions : 13.3 x 4.9 x 11″
  • Power : 1200 W
  • Class : FD
  • Weight : 6.5 pounds
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Rockford R300X4 Prime Amplifier

  • Price: $
  • Dimensions : 16.5 x 10.3 x 4.3″
  • Power : 50 Watts per channel power x 4 @ 4-ohms
  • Class : A/B
  • Weight : 7.5 pounds
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Best 4-Channel Car Amplifier Reviews (Updated List)

1. Rockford Fosgate P600X4 Punch Amplifier

Rockford Fosgate amplifiers are some of the best-selling car amps you will find. That’s because this company has a reputation for building quality amplifiers that help create superior sound in any car stereo system. This fine amplifier from them will put out 125 watts per channel at 2-ohms of resistance.

The included Auto turn-on circuit makes wiring this amplifier easy too. Once it senses the voltage going through the system this 4-channel Rockford Fosgate amplifier will fire itself up without you having to manually turn it on.

It’s an amplifier that stays fairly cool too thanks to its built-in aluminum heat sink. Other safety features on it include both overload and short-circuit protection.

Due to its built-in RCA pass-thru outputs, you can very easily hook up a rear subwoofer to the Rockford Fosgate P600X4 amp too. That will give you all the power you need to blast your car music with lots of heavy bass.

Pros:

  • Auto turn-on circuit
  • 129 Watts x 4 @ 4-Ohms 0° Res
  • Perfect for 4-way or 3-way subwoofer systems
  • Cast aluminum heatsink
  • Short circuit and overpower protected
  • RCA pass-thru outputs

Cons:

  • Not great for feeding multiple subwoofers
  • Heavy at 12.8 pounds

 

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2. MTX Audio THUNDER75.4 Thunder Series Car Amplifier

MTX is a leader in car and marine audio for a reason. They put a lot of effort into the design of their products that helps them become big part of a great car or marine audio experience. This amplifier from them will produce up to 400 watts of dynamic sound in your car stereo system’s speakers.

Not only is this 4-channel car stereo amplifier powerful but it is a lightweight and compact amplifier too. It’s built to be easily surface mounted in even smaller spaces in your vehicle. The surface mount design it has also helped it handle vibration and is ideal for easy hookups too.

It stays cool when running thanks to its extruded aluminum heatsink and it also features very good triple circuit protection.

Its 2-ohm stability comes in very handy too. That makes it a very flexible amplifier that can be used in many different car stereo systems.

Pros:

  • Small footprint for a powerful 4-channel amp
  • 400 Watts total power output
  • Surface mount design
  • Extruded aluminum heatsink
  • 2-ohm stability
  • 4-Channel Class A/B Amplifier

Cons:

  • The panel layout is congested due to its small size
  • Interferes with FM radio frequencies

 

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3. Kenwood 22154656 Compact Digital Amplifier

You don’t get a more trusted name in car stereo equipment than Kenwood and this is a very good 4-channel amplifier from them. This surface mount amplifier from them is simple to install and comes with easy access hookups too. Its peak 600-watt power output should satisfy almost any car stereo owner with three or four-speaker stereo combinations.

It has such unique amplifier features as true RMS power and it has a voltage sensing auto-on switch built into it also. We were pleasantly surprised how powerful this amplifier is for its small size.

If you have a vehicle with very little space to locate an amplifier this one will probably be an excellent choice. It measures only 3” x 7” x 6” and weighs only a scant 2.2 lbs.

This amplifier is fully circuit protected and its printed circuit board is nicely coated to help it shed moisture and resist corrosion.

Pros:

  • Easy to place the compact size
  • 600 Watts peak power output
  • Surface mount design
  • Coated printed circuit board
  • Signal sensing auto turn-on feature
  • True RMS power

Cons:

  • Short 1-year warranty
  • No built-in 4 channel to 2 bridging

 

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4. Alpine MRV-F300 Car Amplifier

ALPINE MRV-F300 4-CHANNEL CAR AMPLIFIERYou would expect the reputable stereo equipment manufacturer Alpine to have a 4-channel amplifier that makes our countdown of the best models and this is a good one from. It’s been newly redesigned to be smaller and more lightweight without sacrificing power.

This amplifier can generate up to 640 watts of total power. In a standard 4-channel configuration, it can consistently deliver 75 watts of power to each speaker too. It runs extremely cool even after being used for a long period of time. Alpine claims it’s because of the anti-shutdown technology they build into this amplifying unit. We certainly are convinced there is something special about its ability to keep cool.

Do you want a 4-channel amplifier that’s easy to install? Well, they don’t get much easier to install than this one. It’s a surface mounted amplifier in a compact package. You don’t need to go to the trouble of hooking it up to any external converters either and its terminal covers use easy snap-on connections too.

Pros:

  • Anti-shutdown design
  • 75W RMS x 4 (2Ω)
  • Class D digital amplifier
  • Snap-on terminal covers
  • 40% smaller than the previous model
  • No external converters needed

Cons:

  • No RCA outputs
  • A slight amount of noise in the system

 

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5. Pioneer GM-D8604 Bridgeable Amplifier

Pioneer is known for making excellent car stereo components that are affordable and that is pretty much spot on what you get with this amplifier from that. It will help you pump some big sound out of your front and rear car stereo speakers without breaking the bank.

It won’t be hard to find a space for this compact car stereo amplifier the way it’s designed. Not only that, but it will deliver 100 watts per channel of power at 4-ohms of resistance. The Pioneer GM-D8604 has a new circuit design that will protect it from power surges, low voltage outputs, and short circuits too.

Want to pair your front auto speakers with a subwoofer in the back. That’s not a problem with the Pioneer GM-D8604. It’s completely bridgeable so you can combine the two dedicated lines going to the back to adequately power most car subwoofers. That makes the Pioneer GM-D8604 a very versatile amplifier.

Pros:

  • Compact but mighty
  • 100 Watts per channel power x 4 @ 4-ohms
  • Class D digital amplifier
  • Improved circuit design
  • Completely bridgeable
  • Comes with adjustable bass remote

Cons:

  • Can run a little hot at times
  • Only comes with a short 1-year warranty

 

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6. Rockford R300X4 Prime Amplifier

When a company puts more than one amplifier model in a best of list it tells you that they know what they are doing when it comes to making car stereo system amplifiers. This is another very good vehicle amplifier from the reputable Rockford Fosgate. It has a compact and easy to install design that does not leave you short on car stereo power either.

At 50 watts per channel that is plenty of sound power for all but the largest vehicle interiors. The Rockford R300X4 is fully circuit protected too and can be conveniently run in either mono or bridged mode too. Its included Butterworth crossover does a nice job of filtering out some of the unwanted higher frequencies also.

One of the great things about this car stereo amplifier is users have noticed that it does not get very hot when running. That’s most likely due to the fact it has a superior cast aluminum heatsink. It’s a characteristic that will help greatly extend this amplifier’s useful life.

Pros:

  • Cast aluminum heatsink
  • 50 Watts per channel power x 4 @ 4-ohms
  • Bridged/Mono modes
  • 4 Gauge power/ground connectors
  • Muted auto turn-on
  • Top mount controls for easy hookup

Cons:

  • Runs to the warm side if not mounted in an area with good air flow
  • Mounting screw holes could be drilled bigger

 

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PRODUCTDETAILS
Alpine KTP-445U 4-channel Power Pack Amplifier

Alpine KTP-445U Power Pack Amplifier

  • Price : $
  • Dimensions : 9.2 x 7.5 x 3.2″
  • Power : 45 watts RMS x 4 at 4 ohms
  • Class : D
  • Weight : 2.4 pounds
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Rockford Fosgate PBR300X4 Punch BRT 300-Watt Ultra Compact 4-Channel Amplifier

Rockford Fosgate PBR300X4 Punch BRT Amplifier

  • Price : $$
  • Dimensions : 9 x 6 x 3.4″
  • Power : 75 Watts per channel power x 4 @ 4-ohms
  • Class : BR
  • Weight : 3.04 pounds
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Kenwood 1177524 Compact Amplifier

Kenwood 1177524 Compact Amplifier

  • Price : $$
  • Dimensions : 14.8 x 6.8 x 3.2″
  • Power : 45 watts x 4 at 4 ohms
  • Class : D
  • Weight : 2.2 pounds
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Rockford Fosgate Power T400-4 400-Watt Multi-Channel Amplifier

Rockford Fosgate Power T400-4 Multi-Channel Amplifier

  • Price : $$$
  • Dimensions : 13.7 x 8.1 x 2.1″
  • Power : 400 W
  • Class : A/B
  • Weight : 11.44 pounds
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BOSS Audio PH4.600 Phantom 2400-watts Full Range Class A B 4 Channel 2-8 Ohm Stable Amplifier with Remote Subwoofer Level Control

BOSS Audio PH4.600 Phantom Car Amplifier

  • Price: $$$
  • Dimensions : 17 x 2.2 x 9.5″
  • Power : 2400 W
  • Class : A/B
  • Weight : 13.46 Pounds
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Alpine PDXF6 PDX-F6 PDX-F6 4 Channel 150W Car Amplifier

Alpine PDXF6 / PDX-F6 / PDX-F6 Car Amplifier

  • Price: $$$$$
  • Dimensions : 13 x 9.1 x 4.3″
  • Power : 600 W
  • Class : D
  • Weight : 7.05 pounds
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7. Alpine KTP-445U Power Pack Amplifier

Alpine KTP-445U 4-channel Power Pack AmplifierAlpine usually delivers when they make a car stereo product and this very nice car stereo amplifier from them is a testament to that. It’s a super-compact model car audio amplifier that surprises you with big sound it will help you get from your front and back car speaker setup.

Do you have space limitations in your vehicle and think it will be hard to install an amplifier on your stereo system? Guess again. This amplifier takes up only 8″ x 2″ x 3” of space. That means it can even be mounted under a seat if necessary.

It puts out a very adequate 45 watts of power per channel (x4 @ 4Ω) and it can be configured to filter out a wide variety of frequencies too. For its class it has one the best signal to noise ratios you will find. It also includes the wiring harness with both RCA and auto-sensing speaker connections.

Pros:

  • Super-Compact class D amplifier
  • 45 Watts per channel power x 4 @ 4-ohms
  • Versatile frequency filtering
  • RCA & auto-sensing speaker-level connections
  • High output/Dynamic response
  • Great signal to noise ratio

Cons:

  • No low pass crossover
  • Included instructions need improvement

 

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8. Rockford Fosgate PBR300X4 Punch BRT Amplifier

Here is the 3rd Rockford Fosgate 4-channel amplifier in our countdown of the best ones. That should tell you about the quality of the amplifiers this company makes. This is an unbelievably powerful amplifier for its size

This amplifier is so small (2” x 4’ x 7”) it can be mounted under the dash or a seat without causing any problems at all. It puts out a very decent 75 watts per channel at 4-ohms of resistance. You probably couldn’t even turn it all the way up without it bothering your ears. It features a Butterworth crossover for frequency filtering and has a series of high-level inputs too.

There are other things to like about this amplifier too. For one, it will work great on ATV’s, motorcycles and RV’s too because it does not take much electrical current to power it, so it does not drain batteries quickly like some other amps do (4-6 volt DC offset voltage).

Pros:

  • Extremely Compact
  • 75 Watts per channel power x 4 @ 4-ohms
  • Butterworth crossover
  • High-level inputs
  • Can work as a dual-channel or 4-channel amplifier
  • Great for RV’s, ATV’s and Motorcycles

Cons:

  • Runs very warm at times
  • Only a 1-year limited warranty

 

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9. Kenwood 1177524 Compact Amplifier

Here is the first 4-chanel stereo amplifier in our countdown of the best ones that you can actually use with a Bluetooth application. With as many people that use apps to play their music on it makes sense that someone would design a Bluetooth compatible amp and Kenwood has done that with this model.

It has some very decent sound power for its smallish size too. It puts out a very respectable 45 Watts per channel power when hooked up to 4 speakers (4-ohms). It has a coated PC board that helps make it moisture resistant and it has a signal sensing turn-on switch too.

This compact amplifier is not only limited to being installed in vehicles either. It will work very nicely in boats, RV’s, and on ATV’s and motorcycles too. It not only does not take up a lot of space but it doesn’t pull much DC current to run either.

Pros:

  • Bluetooth compatible
  • 45 Watts per channel power x 4 @ 4-ohms
  • Moisture resistant PC board
  • Includes waterproof remote control
  • Works well on boats, RV’s, ATV’s and Motorcycles
  • Signal sensing turn-on

Cons:

  • Included blue background light can be bothersome if seen when driving at night
  • Volume controls do not work when hooked up in the line-in mode

 

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10. Rockford Fosgate Power T400-4 Multi-Channel Amplifier

Rockford Fosgate Power T400-4 400-Watt Multi-Channel AmplifierAnother premium product from Rockford and this time it is less powerful but very capable amp which has crystal clear sound and lots of features. This 4 channel amplifier delivers 60W x 4 at 4-Ohms, 100W x 4 at 2-Ohms, 200W x 2 at 4-Ohms bridged (RMS) so it is modular and compatible.

It is a class A/B amplifier with variable front/rear high-pass/low-pass filters with a range of 50-500 Hz which makes a very clear sound and reduces the background noises. It is more affordable than some other Rockford Fosgate products so it will appeal to a wider audience so if you want one of the best products on the market, you should check this amp for sure.

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11. BOSS Audio PH4.600 Phantom Car Amplifier

Compact, nice looking and affordable, Boss PH4. 600 is an interesting proposal for a starter car audio kit. It has interesting features and a high output power of 2400 W which is more than enough for any application. Of course, this amp can work on 2 and 4 ohms and it can be bridged if you need it to be. It is a class A/B amplifier with thermal overload, speaker’s short protection, and remote subwoofer level control so you are covered.

The users reported that this amp work as it should and you can not find a better one in this price range. Some more demanding users said that in some cases, sound clarity was not perfect and it could be better but it can be fixed with better cables and speakers. However, we would recommend this for starters with a limited budget.

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12. Alpine PDXF6 / PDX-F6 / PDX-F6 Car Amplifier

Very elegant looking and nicely designed product is Alpine’s PDX F6 which comes with good features and upscale price, but this is something that you would expect from a manufacturer like Alpine. It is a class D amplifier with a max power output of 600 W at 4 ohms and variable high-pass and low-pass filters.

The package is very compact and easy to install and we would recommend it to users who don’t need much power or extremely powerful sound system but for those who want quality, brand name and perfect sound from smaller but better amp.

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13. BOSS AUDIO PF1800 Phantom 4 Channel Amplifier

Very affordable and very versatile product from Boss Audio in form of PF1800 Phantom amp. It has a pretty decent power output of 1800 W and working range from 2 to 8 ohms which are good to know and usable.

It also features full-range, MOSFET power supply, high and low level inputs, variable high pass crossover, variable low-pass crossover, variable bass boost and remote subwoofer control, Impressive specifications and options in sub 100$ package is obviously intended for budget users that need a lot of stuff and power but don’t have a lot of money.

Users reported that this package delivers on its promise and is a good proposition for any in-car enthusiast on the budget.

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Advantages Of 4 Channel Amplifiers

4 channelThe 4 channel amp is a reasonable proposition for moderate car audio fan which gives him enough options. You can use 4 channel amp only and connect it to four speakers or you can bridge it to have a subwoofer or you can have another amp over it for full power and multi-device connection. It is up to you.

On the other hand, 4 channel amps are compact and cheaper than 5 channel amplifiers and more in reach of a regular in-car audio fan. You can find really small ones which can fit anywhere and you can find even 4 channel amps that are built for special use – like in boats and floating objects.

 

Best 4 Channel Amp Comparison Chart

PRODUCTPRICEDIMENSIONWEIGHTPOWERCLASS
Rockford Fosgate P600X4 Punch 4-Channel Amplifier
$$$$12 x 19.3 x 5.8"12 pounds129 Watts x 4 @ 4-Ohms 0° ResAB
MTX Audio THUNDER75.4 Thunder Series Car Amplifier
$$14.4 x 7.5 x 4"4.5 pounds400 WattsAB
Kenwood 22154656 Compact 4 Channel Digital Amplifier
$$6.7 x 3.1 x 5.9"2.2 pounds600 WattsD
Alpine MRV-F300 4-Channel Car Amplifier
$13 x 9.1 x 4.3"5 pounds640 WD
Pioneer GM-D8604 Class FD 4-Channel Bridgeable Amplifier
$13.3 x 4.9 x 11"6.5 pounds1200 WFD
Rockford R300X4 Prime 4-Channel Amplifier
$16.5 x 10.3 x 4.3"7.5 pounds50 Watts per channel power x 4 @ 4-ohmsAB
Alpine KTP-445U 4-channel Power Pack Amplifier
$9.2 x 7.5 x 3.2"2.4 pounds45 watts RMS x 4 at 4 ohmsD
Rockford Fosgate PBR300X4 Punch BRT 4-Channel Amplifier
$$9 x 6 x 3.4"3.04 pounds75 Watts per channel power x 4 @ 4-ohmsBR
Kenwood 1177524 Compact Amplifier Class D Kac-M1824BT
$$14.8 x 6.8 x 3.2"2.2 pounds45 watts x 4 at 4 ohmsD
Rockford Fosgate Power T400-4 Multi-Channel Amplifier
$$$13.7 x 8.1 x 2.1"11.44 pounds400 WA/B
BOSS Audio PH4.600 Phantom 4 Channel Car Amplifier
$$$17 x 2.2 x 9.5"13.46 Pounds2400 WA/B
Alpine PDXF6 / PDX-F6 / PDX-F6 4 Channel Car Amplifier
$$$$$13 x 9.1 x 4.3"7.05 pounds600 WD

Some Final Thoughts on the Top 4-Channel Amplifiers

Best 4 Channel Amp
This certainly is a fine collection of 4-channel amplifiers that we have on our review list here. They are most certainly among best 4-channel car amplifiers you will find in the car stereo marketplace. Many of them are versatile and that you can adjust such things as the frequency and bass on individual units too. That gives you a lot of flexibility as to how you like your amplified music to sound.

There is no reason that anyone who is looking for a new 4-channel amplifier should not find one of the products to their liking that we did the 4-Channel Car Amplifier reviews on. At the very least you can use our reviews as a guideline of what to look for in a 4-channel amp for your vehicle.