What’s the Best 4 Channel Amplifier

An amplifier is an essential component in building a great aftermarket car audio system. It’s a key product for anyone who cares about great sound quality, and not just seasoned audiophiles. The reason being: car headunits are equipped with built-in amps, but many of these aren’t much to write home about. So, if you want your speakers to really sing, amplifiers are definitely part of the picture.

The first thing to do is to read our unrivaled car amplifier buying guide in which we explained in details all the relevant specifications and guidelines of how to choose the best amplifier for your vehicle.

External car amplifiers are categorized by the number of channels. In other words, they are are categorized by the number of speakers they can power simultaneously. There are mono channel amps and multi-channel amps – with 2, 4, 5 and 6-channels. For the purpose of this article, we’ll be reviewing a few of the best 4 channel amplifiers on the market.

So, without any further ado, onto the reviews…

5 Best 4 Channel Amplifiers Reviews

Rockford Fosgate R400-4D Review

Rockford Fosgate R400-4D ReviewWhen it comes to external car amplifiers, Rockford Fosgate is probably one of the most legendary. They offer a wide range of reasonably priced car amplifiers.

Rockford Fosgate amplifiers come in three categories labeled Prime, Punch, and Power. RF’s “Prime” series amps are considered to be the RF’s most value-priced models while “Power” subs are the high-end line. Punch series amplifiers are more of a middle-of-the-road line of amps. They represent the perfect mix of power and price.

The R400-4D is one of the top rated 4 channel amplifier on the market. It uses a class D topology, which makes the amplifier energy efficient with very low operating temperatures.

The Rockford Fosgate R400-4D is one of the best car amplifier under $200. It can put out up to 75 watts RMS to each of your front and rear speakers, which is more than enough to push them to their full potential. This 4 channel amplifier is bridgeable. In other terms, you can use two of its channels to drive your front speakers while using the other two channels bridged to run a subwoofer with up to 200 watts RMS. And, of course you can bridge the whole amp to 2-channel mode to drive a couple of subs.

This amplifier comes with various features including high- and low-pass filters, along with Rockford Fosgate’s famous Punch EQ bass/treble boost, so you can tune your stereo system to get a well-balanced sound output.

Rockford Fosgate R400-4D Specifications
  • Number of Channels : 4
  • Bridgeable : Yes
  • Class : D
  • RMS Power 
    • @ 4-Ohm : 75 Watts x 4
    • @ 2-Ohm :  100 Watts x 4
    • @ 4-Ohm Bridged : 200 Watts x 2
  • Max Power : 400 Watts
  • Frequency response : 20 – 20,000 Hz
  • Features
    • Variable high- and low-pass filters (50-250 Hz, 12 dB/octave)
    • Variable Punch EQ bass/treble boost (0-18 dB at 45 Hz and 12,000 Hz)
    • Preamp inputs and outputs
  • Warranty: 1 year

Rockford Fosgate P600X4 Review

Rockford Fosgate P600X4 ReviewThe P600X4 is another great 4 channel amplifier by Rockford Fosgate. It’s going to be the most expensive pick of the lot by far. It is the best performing amplifier in Rockford Fosgate Punch series. It’s very well-engineered and would be a great investment for anyone who’s looking for a solid car amplifier with an impressive power output.

At 4 ohm, the P600X4 can put out 75 watts RMS to each of your front and rear speakers, which is plenty of power to make your aftermarket speakers sing.  You can also switch this amp into 2-channel mode – also known as amp bridging – to drive a couple of subs with up to 300 watts RMS each. You can use the amp’s high-pass filter to filter out and prevent the amp from sending low frequencies to your speakers so they’ll play more efficiently. Similarly, you can use its low-pass filter to avoid sending high frequencies to your sub(s). The Punch EQ2 includes bass and treble boosts, in case you want to add some boom and sizzle back into the mix.

To easily match this amp to your receiver’s output, Rockford Fosgate went a step ahead and fitted the P600X4 with their C.L.E.A.N. technology which stands for Calibrated Level Eliminates Audible Noise. C.L.E.A.N. is a technique to ensures your music will sound as clean and powerful as possible. It works as follows :

  • Play the setup tone on the included test CD
  • Adjust the receiver volume until a red clip light on the amp goes out
  • Then turn the amp gain up until a blue light comes on
  • Once the Blue light comes on, your amplifier is matched to your headunit’s output.

If I had to pick some criticisms for this amplifier it would be the price. This amplifier is a bit highly priced than most. However, something this good is naturally expensive. So, if you don’t mind shelling out a few extra bucks, the Rockford Fosgate P600X4 could make day and difference in terms of sound quality, and of course, assuming you’ve got some great sound car speakers.

Rockford Fosgate P600X4 Specifications
  • Class : A/B
  • Number of Channels : 4
  • RMS Power
    • @ 4-Ohm : 75 Watts x 4
    • @ 2-Ohm : 150 Watts x 4
    • @ 4-Ohm Bridged :300 Watts x 2
  • Total Power : 600 Watts
  • Bridgeable : Yes
  • Frequency response : 20 – 20,000 Hz
  • Features
    • Variable high- and low-pass filter filter (50-250 Hz, 12 dB/octave)
    • Variable PEQ2 bass/treble boost (0-18 dB at 45 Hz and 0-14 dB at 12.5K Hz)
    • Preamp inputs and outputs
    • Speaker-level inputs

Kenwood KAC-8406 Review

Kenwood KAC-8406 ReviewKenwood is one of the most recognized brands in the car audio industry. They offer a well-rounded collection of various car audio components including headunits, amplifiers, subs, and speakers.

The KAC-8406 is one of the best 4 channel amp under $200 that Kenwood has to offer. It’s designed to deliver 70 watts RMS per channel to your speakers. Or you can Switch it over to bridge mode, and you can get great performance from a set of powerful components or a couple of subs with up to 200 watts RMS per channel.

The Kenwood KAC-8406 uses class AB design and MOSFET power supply. It comes with high- and low-pass filters, preamp inputs and speaker-level inputs with signal sensing turn-on.

Kenwood KAC-8406 Specifications 
  • Class : A/B
  • Number of Channels : 4
  • RMS Power
    • @ 4-Ohm : 70 Watts x 4
    • @ 2-Ohm : 100 Watts x 4
    • @ 4-Ohm Bridged : 200 Watts x 2
  • Max Power : 900 Watts
  • Bridgeable : Yes
  • Frequency response : 5 – 50,000 Hz
  • Features
    • Variable high- and low-pass filters (50-200 Hz, 12 dB per octave)
    • Switchable bass boost (0, 18 dB at 40 Hz)
    • Preamp inputs
    • Speaker-level inputs with signal sensing turn-on

JL Audio JX400 Review

JL Audio JX400 ReviewJL Audio is a brand we haven’t come across very much at all. However, they’re making a name for themselves in the car audio industry. Their JX400 in one of the best compact 4 channel amplifier on the market. Its tiny size makes a great option for people with very limited space inside their vehicle as well as for those who don’t want to sacrifice their cargo space.

Despite its small size, the JL Audio JX400 is quite powerful. It can put out 70 watts RMS to each of its four channels. In bridge mode, this versatile amplifier can power a pair of speakers or subs with 200 watts RMS each, and fill your ride with well-balanced sound.

The JL Audio JX400 is a very well-engineered amplifier. Its controls are nicely labeled and well spaced out. It comes equipped with variable high- and low-pass filters, speaker-level inputs, along with pre-amp inputs and outputs, so its compatible with virtually any car stereo.

As for cons, it’s really difficult to think of any. If anything, I’d say that the JX400 is a bit pricey. So if you don’t mind shelling out some extra dollars, the JL Audio JX400 would a great, quality compact 4 channel amplifier to buy.

JL Audio JX400 Specifications
  • Class : D
  • Number of Channels : 4
  • RMS Power 
    • @ 4-Ohm : 70 Watts x 4
    • @ 2-Ohm : 100 Watts x 4
    • @ 4-Ohm Bridged : 200 Watts x 2
  • Max Power : 900 Watts
  • Bridgeable : Yes
  • Frequency response : 20-20K Hz
  • Features
    • Variable high- and low-pass filters (50-200 Hz, 12 dB/octave)
    • Preamp inputs and outputs
    • Speaker-level inputs

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