10 Best 4 Channel Amp for Door Speakers 2021

If you require loud but fantastic music in your vehicle, an upgraded factory system is the best solution to the problem. Having an advanced sound system in your car is achieved by installing an upgraded factory system. 

These systems comprise the best amplifier and sound processors that are custom designed for your vehicle. Without breaking a bank, getting a robust 4 channel amplifier is the perfect way to change your car’s sound system without making changes to your speakers and factory stereo.

The best 4 Channel amp for door speaker will bring you both the rear-fill and the strong front stage music in your car hence exhibiting a front-to-rear system. 

In this review, we have compiled some of the best 4 channel amps for door speakers out in the market and their pros and cons. Also, this review will guide you on the factors to observe when getting an amplifier for your car.

1. Skar audio RP-75.4AB

Skar Audio is among the leading manufacturers of audio speakers in the world. Whichever option you will be going for, you will get absolute performance since the company produces a wide range of amplifiers that fits almost every vehicle in the market. 

Skar audio RP-75.4AB is an absolute amplifier for your vehicle. The clarity design of this class A/B makes the audio signals amplified maximally for an efficient and precise result. 
 
For a high current flow in the system, the RP-75.4AB exhibits a ground input connection and 8 gauge power. The amplifier traps a wide area of sound signals.

It is a full-bodied amplifier having 4-way circuitry, advanced internal components, and a high-speed MOSFET supply for a lengthy safe operation and performance. The adjustable user controls like the HFP, gain, LFP, Bass EQ, and crossover allows the amplifier to be used in several applications.

Skar Audio RP-75.4AB is an efficient, reliable, and robust class AB four-channel car amplifier. The strength of the amplifier can power the whole upgraded speaker system and brings life to the music in the car.
Pros
  • Compact and flexible
  • a legit one year warranty
  • An effective sound-noise ratio
Cons
  • Expensive

2. BOSS Audio Systems R1100M

The BOSS Audio System R1100M steps up your musical experience to another level making it a must-have device for your vehicle. This is an excellent amplifier with a great noise ratio to ensure that you have a loud and clear sound while driving. 
 

It exhibits a high-level input system typically used to connect the aftermarket speaker or factory radio for an excellent system’s excellent efficiency.

Furthermore, the low pass filter help eradicate the unwanted notes under the frequency setting. It is primarily used to maintain the high notes on the speakers and subwoofers.

This amplifier comes with an easy installation manual. The power is usually connected to the vehicle’s chassis keeping the ground wire at most 100cm in length. Following this manual, you can efficiently perform the installation yourself, but you should look for a certified in Electronics for safety purposes.
 
The powerful and speedy MOSFET power makes BOSS Audio System R1100 an ultimate amplifier to accommodate your vehicle. The mighty MOSFET power allows you to operate the devices for a more extended period without any malfunctions.
 

The device functions at 2 ohms with 1100 Watt power output in one channel and 4 Ohms with a 550 Watt power output. This features power that your subwoofer requires to deliver fully.

Pros
  • Great sound quality
  • Easy to install
  • Great mid and high end
Cons
  • Sometimes tweeters stop working

3. CT Sounds 80.4D

CT Sounds is a well-established company in manufacturing super strong amplifiers. The CT- 80.4 class D amplifier is engineered with a complete range quality fitting almost anywhere in the vehicle.

It has a subsonic filter and an advanced low pass filter that ensures that you to get the exact content you need to hear from the amplifier. Also, the heat dissipation design and the powerful MOSFET supply ensure that it runs and operates for even long demanding playlists. 

Moreover, the powerhouse amplifier exhibits small footprints and a small compact chassis making the installation of the CT amplifier in any vehicle audio application. With an incredible RMS power of 4 x 120 W, the amplifiers allow a smooth and efficient flow of current through the system.

CT- 80.4D indeed improves the sound produced by the speakers. It is highly protected from any damage by an outstanding protection circuitry engineered with high-temperature protection, low voltage, and high voltage, and over current. This feature ensures that your amplifier is kept in superb condition.

Pros
  • Great sound quality
  • Easy to install
  • Great mid and high end
Cons
  • Sometimes tweeters stop working

4. Planet Audio AC2400.4

Class A/B amplifiers are known for their power to give a quality sound system while operating more efficiently than the typical Class A amplifiers. 

The Planet Audio AC2400.4 is engineered with a unique linear circuitry that helps minimize distortion while improving both the power output and quality of sound.

It has an amazing MOSFET which is an ideal amplifier for any vehicle. MOSFET is an abbreviation for Metal Oxide Semiconductor Field-Effect transistor. MOSFETs are essential in your car because they are usually used to amplify the sound signals for a better outcome or switch. 

Unlike other FETs, MOSFETs operate at a lower current, making them a suitable amplifier for a car sound system. The robust powerhouse amplifier also exhibits a thermal protection circuit system that turns the amplifier off and on when it gets hot. It protects your amplifier from distortion by cooling it before turning it on again.

This amp will not stress distortion, the protection circuit in the amp will cut the output if any problem arises and maintains that condition. It accepts a minimum of the impedance of up to 2 Ohms.

Pros
  • Great sound quality
  • Easy to install
  • Great mid and high end
Cons
  • Sometimes tweeters stop working

5. JBL GX-A604 435W

For over seven decades, the GX-A604 has boasted of bringing life to music. It has thrived in the music industry by giving the best to its customers. This amplifier can provide each of your front and back speakers with a power of 60 Watts RMS. 

The power it sends to all the channels is almost five times what most ordinary factory speakers can provide. Furthermore, the compact but robust amplifier has unique speaker-level inputs that help upgrade the factory’s system power.

The GX-A604, unlike other amplifiers, can also be used in 3-channel mode, allowing you to reduce the sound system’s volume. 

Additionally, if you don’t like louder music, it consists of a high-pass filter which aids in removing the low bass from ordinarily small full-range speakers. With this feature in place, your speaker can produce cleaner and louder music. Moreover, the rear filter can be switched to low-pass when you are dealing with a subwoofer.

It gives you a fantastic and livelier driving condition and comprises an excellent built-in bass boost which helps add some aroma to the music when driving. 

JBL has incorporated some of the latest advanced technologies in the amplifier to ensure that you have an entertaining and transformed listening experience with a remarkable degree of clarity and power. Whether you want to transform your sound system to the world-class level or improving your factory’s sound system, then GX-604 got you covered.

Pros
  • Great sound quality
  • Easy to install
  • Great mid and high end
Cons
  • Sometimes tweeters stop working

6. Taramps DS1200

Taramps features among the leading companies in the manufacture of the car audio system across the globe. The DS 1200X4 2 Ohm is uniquely engineered with high performance and advanced technology for all car audio systems. 

The high technology behind this amplifier makes it a perfect device for your car. Moreover, the amplifier captures higher frequency signals and brings the best and clear sounds.

The powerful DS 1200X4 2 Ohm amplifier exhibits a thermal protection circuit system that turns the amplifier off and on when it gets hot. It protects your amplifier from distortion by cooling it before turning it on again. 

Furthermore, when the speaker stops functioning due to an electric shock, the protection circuit in the amp will cut the output until the condition is solved. The >88dB sound to noise ratio clarifies the clarity you are looking for in the music.

This amplifier will ensure that your driving experience is brought to life through a great sound system. The sturdy amplifier comprises an excellent built-in bass boost which helps add flavor to the music when you in the driving model. It is modeled with the latest advanced technologies to ensure that you have an entertaining and transformed listening experience with an astonishing degree of clarity and power.

Pros
  • Great sound quality
  • Easy to install
  • Great mid and high end
Cons
  • Sometimes tweeters stop working

7. Blaupunkt 1500W

The Blaupunkt 1500W 4-Channel has a slim structure to fit in any vehicle perfectly. Its slim structure allows you to connect the amplifier to any stereo system. With an excellent signal-to-noise ratio less than or equal to 90dB, the amplifier will ensure no interference from the background noise.

It has maximum power output; An optimized RMS of 1500 Watts and 150 Watts respectively provides your sound system with an excellent boost in power, giving the driver and passengers a lovely road trip. 

Also, the amplifier boasts of a minimal Total Harmonic Distortion of 0.05 % allows the music to be more precise. Moreover, the lightweight amplifier exhibits small footprints and a small compact chassis making it an easy-to-install machine.

With a maximum output power of 4 x 1500W, it supplies power to all four channels sufficiently through the whole sound system. Furthermore, it also exhibits a robust protection circuitry that protects the entire system from electric shock.

Pros
  • Great sound quality
  • Easy to install
  • Great mid and high end
Cons
  • Sometimes tweeters stop working

8. Crunch PX1000

Crunch PX1000.4 consists of quality RCA materials that minimize distortion and interference in the signal and, hence, better sound quality. 

Moreover, minimal distortion is attained by connecting the amplifier to a maximum low voltage passing through the amplifier at low voltage. These features give you loud but clear sound music for a comfortable ride.

It has a uniquely modified heat sink that protects your amp from overheating. Moreover, the thermal dispersion technology in the amplifier ensures that the heat sink maintains its excellent operating condition with very minimal distortion. This fantastic amplifier operates in multiple operation modes known as dual stereo bridged, bridged mono, the four channels, and stereo.

This amplifier will provide you with an enjoyable driving condition flavored with incredible music. Besides, it is highly protected from any damage by an outstanding protection circuitry engineered with high-temperature protection, low voltage, and high voltage, and over current.

Pros
  • Great sound quality
  • Easy to install
  • Great mid and high end
Cons
  • Sometimes tweeters stop working

9. JBL Stage A6004

JBL proves to be a monster in the music industry as far as amplifiers are concerned. Finding an appropriate location for an amplifier has been a major problem for most people trying to purchase amplifiers. But Stage A6004 4-Channel has a small compact design making it more versatile.

Stage sound system consists of onboard circuitry that helps protect the entire body from high temperature, shorts, under-voltage, and overvoltage. It also includes an excellent LED indicator included in all the models, letting you know when any problem occurs.

Furthermore, it has adjustable low levels and high levels. When operating with a low-level input, the control system adjusts the sensitivity automatically between 0.2- 6 Vrms. On the other hand, when the amplifier operates with high-level inputs, the control adjusts sensitivity between 500mVrms to 15Vrms. Besides, the lower pass filter crossover will allow you to change the sound considering the environment or application.

Pros
  • Great sound quality
  • Easy to install
  • Great mid and high end
Cons
  • Sometimes tweeters stop working

10. KICKER DXA 250.4

The KICKER DXA gives you a perfect and noise-free driving experience through a fantastic feature called differential-balanced inputs which removes unnecessary noise and prevents audio interferences from entering into the system. 

Moreover, the compact amp features distinguished controls to operate the front and back channels .through this fantastic feature, and it is possible to operate a variety of discrete subs or speakers.

The front channel on the KICKER DXA 250.4 can power the back channels together for a successfully powered subwoofer with an RMS of 125 Watts. The full-bodied amplifier boasts a fail-safe integration technology that will enable you to tap the amplifier’s input signal wirings for the vehicle’s factory speaker. 
 
The advanced integrated feature is only attributed to amplifiers of great qualities such as KICKER DXA 250.4. Furthermore, DXA 250.4 can achieve 4- channel play by applying signals to other channels if you have one stereo in your car.

KICKER DXA 250.4 will give you a piece of excellent-sounding music at 30 Watts RMS in each speaker. The RMS is fixed in a compactly designed chassis that makes it an ideal amplifier for any vehicle. 
 
The powerful KICKER is capable of delivering three times what an ordinary factory system can give. The amplifier there brings absolute punch and clarity to the sound system in the speaker.
 

The device functions at 2 ohms with 1100 Watt power output in one channel and 4 Ohms with a 550 Watt power output. This features power that your subwoofer requires to deliver fully.

Pros
  • Small in size, making it easy to operate
  • Do not require onboard fuses.
  • 2-year warranty
Cons
  • Heats up fast

Best 4 Channel Amp For door speakers: Buying Guide

Inputs/connections

Most people usually prefer an amplifier that allows you to plug in almost all of the compatible devices. You should carefully observe whether the amplifier you are paying for has enough inputs for different plug-ins. The amplifier should be designed to accommodate all of them.
Signal to noise ratio
There is always some noise from the whizzing electrons inside an amplifier. The main objective of a good amplifier is to ensure that the noise is imperceptible. This implies that you get to hear more music and less noise. Therefore, the more significant the ratio, the better!
Power output
Power output is relatively equal to how loud you can play the music, but generally, you don’t require more energy as you expect. A perfect amplifier produces twice the power of the speaker. 
 
For instance, a speaker operating at 8 ohms and 350 W programs will require a 700 W amplifier for the same 8 ohms load. Therefore, sound amplification will not be perfect if an amplifier having a lower or higher amplification is in operation with the 8 ohms.

Crosstalk

It is possible to determine which side of the stage the artist is standing on and which side the instruments are located on. Crosstalk is the estimate of how much the unwanted left signal mixes with the correct output. The crosstalk should be as little as possible for clear sounds. The sound is not much clear when the crosstalk is more.
Frequency
Frequency coverage is an ideal factor paramount in every amplifier. Every amplifier has its frequency range. Before getting an amplifier, you should look for extensive frequency ranges for a broad scope of sound signals.

Why 4 channel amplifier?

Amplifiers ensure that you have a loud but clear sound system. If you need a loud musical experience in your car, then amplifiers got you covered. Furthermore, they will provide a more defined and more precise sound system at different volume levels in your speaker. The levels of the sound produced by them allow you to have a great experience without interfering with other parties.
 
Upgraded speakers require relatively higher power to operate to their capabilities. An in-dash receiver or factory system may not provide the much need power of these high-quality speakers. Therefore, amplifiers are so essential since it gives high power to the speaker for its peak performance. Consequently, the powering subwoofer also requires equally higher power that only a separate amplifier can provide.
 
The 4 Channel amplifiers always allow you to add another sound drive if you need louder music. Most of these amplifiers are placed strategically in the car, mainly under the passenger seat for accessibility. This makes the driver efficiently operate the amplifiers without any disturbance while driving.

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