Top 8 Best 4-Channel Amps

With so many high-quality amplifiers available, determining which is the best 4-channel amp may be challenging, and picking the ideal one might be overwhelming if you’re inexperienced about the right qualities to look for.

Unless you buy or own a premium car, you may want a 4-channel amp sound system to play your tunes, as basic stereo systems are subpar at best.

As a result, even without adding extra components, investing in a high-quality amplifier greatly improves the sound quality of your car radio system.

But which 4-channel amplifier is the best?

As is the case with the majority of parts of the car audio industry, there is no one best four-channel amplifier; the majority of the decision comes down to personal choice and compatibility with your existing stereo system.

In this review, we have listed the best 4-channel amps you can buy. There should be at least one amp on this list that suits all of your needs including your style and budget.

Read on to find the best 4-channel amplifier for you and your car.

Rockford Fosgate PBR300X4

Rockford Fosgate PBR300X4 Punch 300 Watt 4 Channel Boosted Rail Amplifier

This is a four-channel amplifier with rapid response. Your audio experience will be considerably enhanced with the Rockford Fosgate PBR300X4 amplifier.

While saving energy, it generates sharp, clear sounds so you can hear the music in the way it was made to be heard.

This top-of-the-line four-channel amplifier works incredibly well when used with speakers.

It’s small enough to fit into tight spaces and the simple wiring is easy to manage to make installation a breeze. Also, the battery power is accurate and durable.

This is the one for you if you want incredibly clear sound even at a very high volume. Additionally, it has settings for balancing sounds.

This amp includes various choices for fine-tuning your speakers. so, at no additional cost, you keep entire control over the crossover.

This four-channel amplifier also features advanced Boosted Rail technology. It boosts the circuitry to increase the amp’s battery power for managing high levels.

However, in the absence of sufficient ventilation, this amplifier grows rather hot.

Pros

  • Very powerful sound quality
  • Can precisely fine-tune and control the settings for the best sound

Cons

  • Gets hot if there is little ventilation
Sale
Rockford Fosgate PBR300X4 Punch 300 Watt 4 Channel Boosted Rail Amplifier
  • Our ultra-compact (1.53” x 4.25” x 6.75”) Punch PBR300X4 is a full-range 4-channel amplifier designed for stereo front/rear systems that packs a Punch with 300 Watts of power without sucking a lot of juice from your electrical system
  • Designed to be compact and efficient while providing big power - RMS Power Output: 75 Watts x 4 @ 4-Ohm (4-Ohm only)
  • Featuring our Class BR, Rockford Fosgate’s patented Boosted Rail technology that sips current while retaining a storage reserve for extended bursts of power. Perfect for smaller stealth installations, motorcycles and recreational vehicles
  • Featuring high level inputs, MOSFET output stage, variable 4-6 volt hi level DC offset voltage input turn-on control, and 12dB/octave Butterworth crossover
  • Famous Rockford Fosgate build quality with a full 1-year warranty when purchased from an authorized Rockford Fosgate reseller

Alpine X-A70F X-Series 4/3/2 Channel Power Density Amplifier

Alpine X-A70F X-Series 4/3/2 Channel Power Density Amplifier

Alpine has been creating high-quality vehicle audio equipment for decades.

This Alpine Amp X-A70F is quite simply one of the best four-channel amplifiers available in the whole automotive audio market.

However, because it is such a high-quality item, this amplifier is rather pricy and so may be too much of an investment for some people.

The amp produces 120 watts RMS per channel at a resistance of 4 ohms, making it one of the most powerful amplifiers that you can buy.

If this is somehow not enough power for you though, you push it up to 175W RMS at 2 ohms.

All this power lets you run up to four high-performance speakers in your car, offering an unparalleled audio experience unlike any other in a car.

But what if that still isn’t enough power for you? If you want even more power, this amplifier is bridgeable and may be used in conjunction with a 3- or 2-channel amplifier.

With that much power, you might expect the amp to overheat, but because of its D Class architecture and heatsink design, the amp runs cool for lengthy periods of time.

It is not only about power though. This amplifier has the broadest frequency range of any amplifier on the market, ranging from 5 Hz to 100 kHz. No other amp comes close to that.

Additionally, the Alpine X-S/N A70F’s ratio of 115/95 dB and THD of 0.05 percent adds to the amp’s unrivaled dramatic, lifelike sound representation.

With this amp, you really get what you pay for. Yes, it is expensive, but for such a high-quality product, you can’t really fault the price.

Pros

  • Most powerful amp on the market
  • Very easy to adjust the settings
  • Can be used in combination with other amps to boost power
  • Amazing sound quality

Cons

  • Very expensive and a definite investment
  • Quite bulky
Alpine X-A70F X-Series 4/3/2 Channel Power Density Amplifier
  • RMS Power Handling @ 4 Ohms: 120 Watts RMS Power Handling @ 2 Ohms: 175 Watts
  • Alpine ID Sound Quality, solving what’s missing in most car audio systems these days: great spatial imaging and depth of sound stage.
  • Class-D Performance
  • Built-in Crossover & Bass EQ
  • Remote Bass (RUX-KNOB.2) Compatible

CT Sounds AT-60.4 Class AB 4

CT Sounds AT-60.4AB 320 Watt Class AB Competition 4 Channel Car Amplifier

The CT Sounds AT-60.4 Class AB 4 amplifier features an ergonomic design and four channels. It is capable of supplying power to both the front and rear speakers.

Additionally, the design is transparent, allowing you to see what is happening inside which is just a cool added aesthetic feature.

This amp is ideal for locations where a single speaker set is insufficient. It has an excellent bass boost and precise smooth pass filters.

If you’re looking for a high-quality amp for your car, this is it. It is driven by a variety of powerful features, including efficiency, ease of use, and power.

If you are sick of listening to music with big distortion gaps due to high volume then you should get this amplifier. It also improves the quality and output of the sound stream, allowing for precise tuning.

The only big downside to this amp is that if left unattended for an extended amount of time, it may become rather hot.

This is not a significant issue if the container is kept in a modest, well-ventilated area though, and does not affect the usability that much.

Pros

  • Unique design makes it stand out from other amps
    Very energy efficient and responsive

Cons

  • Can run hot if not placed in a well-ventilated area
CT Sounds AT-60.4AB 320 Watt Class AB Competition 4 Channel Car Amplifier
  • Equipped with a Diode 6A60 for reverse polarity protection along with a 4-way protection circuitry; sleep easy at night knowing your 4ch car audio amplifier is protected
  • Built using an advanced PCB board featuring Korean capacitors, high quality transformers and cutting-edge inductors to ensure this 4ch car amplifier delivers the power you need to destroy the competition in the SPL lanes
  • LED logo, plexiglass bottom, and reinforced tiffany style RCAs gives this car stereo amplifier a prestigious look that is guaranteed to turn heads
  • Heavy duty heat sink design, high power MOSFET switching technology, and best in class internal components will ensure the amplifier for car speakers runs cool for even the most demanding playlists
  • 4 channel amplifier car audio with 75 watts RMS power at 4-ohm load x 4-channels (14.4v); 105 watts RMS at 2-ohm load x 4-channels (14.4v); 210 watts RMS at 4-ohm bridged x 2-channels (14.4v)

Rockford Fosgate P600X4 Punch

Rockford Fosgate P600X4 Punch 600 Watt 4 Channel Amplifier

With this 4-channel amplifier, Rockford reaffirms its reputation for producing high-quality, powerful vehicle audio equipment.

The company has gone above and beyond by developing a device that is compatible with a huge range of hardware that makes it even easier to install into your car setup.

The Rockford accepts input from a broader range of sources than other amplifiers, with a sensitivity range of 150 mV to 12 volts.

This is frequently between 50 mV and 2 volts less or more than the next competitor. This is the amplifier for everyone who has an 8-track.

This A/B class amp produces a high-quality soundscape that few other amps can compete with.

The P600X4’s signal-to-noise ratio is above average, at 150/85 dB depending on configuration, though 85 dB is more practical for the bulk of current standards.

When used with powerful 2 ohm speakers, this amp delivers 150 watts RMS per channel, while 4 ohm speakers offer 75 watts per channel.

However, the amplifier is bridgeable, which means that if extra power is required, it may be added via the bridged channels.

The RCA inputs accept both high and low-level audio signals directly, allowing you additional flexibility when making your set-up.

Additionally, the amplifier’s CLEAN design and variable 12 dB/oct Butterworth crossovers ensure a perfectly clean signal is supplied to your drivers.

Anyone who likes bass will love the Punch EQ setting, which features a +18dB boost at 45Hz and delivers some serious bass when combined with the proper subwoofer.

In general, this is an excellent amplifier that will improve the sound quality of any car audio radio. The main disadvantage is that it is quite pricey, and if you own a smaller vehicle, this amp may be excessive.

Pros

  • Bridgeable
  • One of the highest S/N ratios of any amp on the market
  • Very easy to add to your set-up

Cons

  • Quite large and bulky
  • Expensive
Rockford Fosgate P600X4 Punch 600 Watt 4 Channel Amplifier
  • The Punch P600X4 600 watt 4-channel amplifier (2.38” x 7.76” x 13.28") is perfect for a 4-way full-range system or a 3-way system having a front stage with subwoofers on the rear channels
  • Versatile multi-channel design can power just about any audio system configuration (RMS Power Output: 75 Watts x 4 @ 4-Ohm OR 150 Watts x 4 @ 2-Ohm OR 300 Watts x 2 @ 4-Ohm Bridged)
  • RCA inputs can accept both Hi and Low level audio signals without the need of a signal converter
  • Featuring Class A/B topology, RCA pass-thru outputs, on-board Punch EQ with +18dB boost @ 45Hz, variable 12 dB/Oct Butterworth crossovers, and C.L.E.A.N. Set-up
  • Famous Rockford Fosgate build quality with a full 1-year warranty when purchased from an authorized Rockford Fosgate reseller

Planet Audio AC2400.4

Planet Audio AC2400.4 4 Channel Car Amplifier - 2400 Watts, Full Range, Class A/B, 2-4 Ohm Stable, Mosfet Power Supply, Bridgeable

The AC2400.4 ANARCHY from Planet Audio is distinguished by its robust power supply and bass augmentation. It also features an excellent bass boost and precise subwoofer control.

It is the best alternative to the standard factory systems. This four-channel amp will function well and always be distortion-free regardless of how loud or quiet the sounds are.

The high and low-level inputs, as well as the switchable low and high-pass crossover, are especially noteworthy.

The sound efficiency and output of an amplifier are two of the most significant aspects you need to look at when buying an amp. Planet Audio does well in these categories thanks to the use of MOSFET technology.

It makes use of Metal Oxide Semiconductor Field-Effect Transistors. This increases efficiency while keeping an eye on energy output and quality.

The only disadvantage of this solid-state amplifier is its low output power. Though it is supposed to have a clear power output of 2500 watts, it struggles to get to this level.

Pros

  • Very precise subwoofer control
  • Good bass boost quality
  • Bridgeable

Cons

  • No clear power output at 2500 watts
  • Can get rather hot
Planet Audio AC2400.4 4 Channel Car Amplifier - 2400 Watts, Full Range, Class A/B, 2-4 Ohm Stable, Mosfet Power Supply, Bridgeable
  • 600 W MAX Power @ 2 Ohm x 4 Channels
  • 300 W MAX Power @ 4 Ohm x 4 Channels
  • 1200 W MAX Bridged Power @ 4 Ohm x 2 Channels
  • Full-Range, Class A / B Topology, MOSFET Power Supply
  • Low and High Level Inputs, Variable Filter, Variable Bass Boost

JL Audio JD400/4

JL Audio is a very respected brand in the automobile audio industry, having developed a slew of high-quality amplifiers throughout the years.

This Class D amplifier, includes a 4-volt preamp output, which enables you to pass the signal from your JL Audio 4-channel 6-9 system to a second amplifier for a subwoofer.

The amplifier can provide 75 watts RMS at 4 ohms or 100 watts RMS at 2 ohms.

Additionally, it is totally bridgeable, giving you even more power and versatility, letting you pump an incredible 200W into two channels at 4 ohms.

Not only is this amplifier powerful, but it also features JL Audio’s unique NexDTM high-speed switching technology for crystal clear sound.

This enables the amp to deliver a significant amount of clean power while maintaining high efficiency and low distortion level.

To add clarity, the signal processing features include high or low-pass 12 dB / octave filters with a continually changing frequency selection range of 50–500 Hz.

Also, the differential-balanced inputs of the amp accept both line-level and speaker-level signals.

If clarity is a must for you, this compact amplifier has an incredible Signal-to-Noise Ratio of 104 dB and a THD of less than 1% at 2 ohms per channel.

This amp is fantastic, and its bridgeability enables a wide variety of setups. It is not the most affordable vehicle amplifier on this list, but it is more affordable than a lot of amps of this quality.

If you’re searching for a small amplifier that successfully pushes a clean signal, go no further than this JL Audio amplifier.

Pros

  • Bridgeable
  • Small and compact compared to other amps
  • Very clear and crisp sound

Cons

  • No internal fusing
  • Expensive

Clarion XC1410

Clarion XC2410 400W Peak Ultra Compact 4/3/2 Channel XC Series Micro Class D Marine Amplifier

This is a well-built, durable, and compact amplifier. It delivers a 50 watt RMS per channel with exceptional sound quality.

It’s so little and yet so powerful that you won’t find another on the market that’s as well-built. Also, the music produced by this four-channel amplifier is distortion-free.

It eliminates the popping and crackling noises associated with increasing loudness. Additionally, it features a safe and smooth power-on and power-off mode to prevent any potential damages.

It also features high-pass filters, a low bass response, and is very energy efficient. The amp’s only shortcoming is the absence of a safety cutoff.

The only real drawback of this amp is that if you overdrive the amp’s power output, it may tune out for a few seconds.

Pros

  • Compact
  • Durable
  • Very simple to install

Cons

  • If overloaded it stops working for a few seconds
Clarion XC2410 400W Peak Ultra Compact 4/3/2 Channel XC Series Micro Class D Marine Amplifier
  • 400 Watts Maximum Power Output 75 Watts x 4 @ 2-Ohms 50 Watts x 4 @ 4-Ohms 150 Watts x 2 @ 4-Ohms Bridged
  • Marine and Automotive Environment Compliant Meets or Exceeds ASTM D4329 (UV Exposure) Meets or Exceeds ASTM B117 (Salt and Fog Exposure)
  • Pulse-Wide Modulation (PWM) Regulated MOS-FET Power Supply Double Sided Conformably Coated PCB Soft Turn-On and Turn-Off Circuitry
  • Variable Gain Control for Front, Rear Variable High-Pass Filters RCA and High Level Speaker Inputs

Kicker CXA300.4

Kicker 43CXA3004 Speaker Amplifier CXA300.4 Amp 300W (Renewed)

This is a four bridgeable amplifier, however, it is not as powerful as other amps on this list.

Because of this, you may find it more suited to car door speakers and will probably need to pair it with a subwoofer amplifier if you want to use it as a standard amp.

When all four channels are powered, this Class AB amplifier can provide up to 75 watts RMS per channel at 4 ohms, or 150 watts RMS at 2 ohms or 4 ohms bridged into two channels.

The amp’s signal-to-noise ratio of 95 dB is quite outstanding given the price. Additionally, it efficiently distributes power to the proper components because of its input sensitivity range of 125 mV to 10 V.

The amp has Kicker’s unique KickEQTM bass boost, which gives up to a 12dB increase when needed. It also features a powerful 12dB crossover, which enables you to quickly fine-tune your system to your liking.

The frequency response is wider than that of the majority of the amplifiers, spanning the range from 109 to 20k Hz.

Additionally, because this amplifier features both high and low-level inputs, it is great for partnering with a factory head unit.

Unfortunately, this Kicker is one of the larger amps that you can buy, so if space is a concern, you may want to look elsewhere.

Despite this, the amp makes use of Kicker’s superior heat sinks, which keep it cool even in restricted places.

Pros

  • Bridgable
  • Pretty good S/N tattoo of 95dB

Cons

  • Not super powerful on its own
  • Pretty big
Kicker 43CXA3004 Speaker Amplifier CXA300.4 Amp 300W (Renewed)
  • Output wattage, 300.0
  • Connectivity technology, RCA

Buyers Guide

A four-channel amplifier receives and increases an electrical signal. The signal is subsequently sent to speakers, which may be conventional loudspeakers, specialized tweeters, or subwoofers.

A four-channel amplifier provides equal power to all four channels.

Certain four-channel amplifiers are sometimes capable of bridging the power from several channels.

This often doubles the power output of the amplifier, although this is not always the case, particularly with lower-quality amplifiers.

Here are the important things you need to look out for when buying a four-channel amplifier.

Size Of Amp’s Fuse

The amp’s fuse size impacts whether or not it can deliver the promised continuous wattage. This is computed by multiplying the wattage by two and dividing by the vehicle’s battery capacity.

For example, if an amp generates 250 watts, increase it by two – the number of watts entering. Then divide by the vehicle’s battery voltage, which is normally 14.4 volts.

This generates 35 amps. Without fuses with a minimum rating of 35 amps, the amplifier will be unable to continually deliver the full 250 watts.

Sound Quality

A few features and qualities will ultimately define the highest possible sound quality your amplifier can provide.

Among these are filters, frequency response, sensitivity, sound-to-noise ratio, and overall harmonic distortion (THD).

Each of them has a particular influence on various components of the soundscape, and some are more noticeable than others depending on what you’re listening to.

Three filters are used, two of which are conventional on the majority of acceptable amplifiers and one of which is more specialized. There will be two filters on the majority of amplifiers: high pass and low pass.

If a signal is not too high pitched but falls within a lower but still medium level range, the low pass filter (LPF) will transmit it solely to channels with speakers capable of reproducing that frequency – often the midbass or subwoofer.

In comparison, a high pass fade (HPF) filters out high-frequency noises and feeds them only to speakers capable of reproducing them–typically tweeters and super tweeters.

Frequency Response is a feature that establishes the frequency range in which the amplifier may function. The higher the value, the broader the scope of the soundscape.

However, the frequency response can be misleading since many of the highest and lowest frequencies are inaudible to the human ear, which works non the 20Hz to 20kHz frequency range.

When a frequency falls below a particular threshold, it enters the subharmonic stage, although these frequencies are usually felt but not audible.

Similarly, when a frequency reaches a predetermined value, it enters the superharmonic phase, which is frequently inaudible and unfilmable.

The term THD – Total Harmonic Distortion – refers to the degree to which an amplifier accurately duplicates the input signal as it is supplied to the speakers. This figure should be kept to a minimum.

In essence, when the signal passes through the amp and is decoded before being supplied to the speakers at a higher power level, it may become modulated and distorted.

The finest amplifiers will have the lowest total harmonic distortion (THD) and will reproduce the signal more precisely at higher power levels.

Avoid amps with a THD of more than 3%, since you may notice a difference in sound quality and the actual sounds will differ from those on a higher-quality system.