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Best Mini Car Amplifiers Reviews

Most people who are looking to upgrade their factory car audio system aren’t sure where to start and often go with the most visible option first—a new CD receiver. While a new aftermarket receiver can relatively enhance the sound quality you experience in your car, it’s the speakers and amplifiers that are the key to achieving and filling your vehicle with audiophile-grade sound.

It must be noted that amplifiers aren’t just for seasoned audiophiles and bassheads who like to be heard miles away. In reality, an external amplifier — no matter how small it is will provide cleaner sound, more power and better performance.

We’ve reviewed a ton of different car amps on this site before. In today’s post, we’ll be reviewing some of the best compact car amplifiers in the market. So, even if don’t have enough space inside your vehicle to accommodate a large amplifier, you won’t have to feel left out, because these mini car amplifiers can get the job done just fine.

Compact car amplifiers feature thin enclosure and can easily fit into tight spots. Their relatively easy installation process and tiny size make them suitable for vehicles with limited space such as compact hatchbacks and sport cars.

Although these small car amps aren’t powerful enough to drive power-hungry subs, they’ll undoubtedly add some depth and punch to your music even in a stock situation.

Best Compact Car Amplifiers Reviews

1. Rockford Fosgate Punch PBR300X4

Dimensions  6-15/16″W x 1-9/16″H x 4-5/16″D
Number of channels 4
Frequency range 20 – 20 kHz
Power Handling  75 watts RMS x 4 at 4 ohms
Bridgeable No
Amplifier Class BR

Rockford Fosgate is one of the most recognized brands within the car audio community. They’re a great company with a solid reputation for quality, and it really shows. They offer a wide variety of car audio components including subwoofes, speakers, amplifiers and signal processors.

The PBR300X4 is one of the best compact car amplifiers that Rockford Fosgate has to offer. This 4 channel amp delivers 75 watts RMS to each of your front and rear speakers, giving you the power for waking up your speakers and making them fill your listening space with great-sounding music. The downside, however, is that this 4 channel amp is non-bridgeable.

This amp features Rockford Fosgate Boosted Rail (BR) amp technology which uses advanced capacitors and high-speed circuitry to boost the amp’s power supply voltage, when needed, so it can handle musical peaks without giving out. This technology allows for a powerful small amplifier that can fit almost anywhere, making the PBR300X4 suitable for cars, motorcycles, ATVs and hybrid-electric vehicles.

Rockford Fosgate PBR300X4 is a very well-designed amp. Anything from its input blocks to mounting screws scream quality. It’s featured with speaker-level inputs with signal-sensing turn-on, allowing you to hook this amp up to almost any system.

This amp comes with selectable high- and low-pass filters. In terms of frequency response, you are looking at a pretty standard 20 Hz to 20 kHz.

As far as thermal protection is concerned, this amplifier features an extruded aluminum heat sink which in combination with Rockford Fosgate’s heat management technology ensure reliable, long-term play.

Rockford Fosgate PBR300X4 was designed specifically for space limited applications in need for four-channel amplification. It’ll make a night and day difference in terms of sound quality, however, it’s not really something that seasoned audiophiles would use in their main systems.

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2. Kenwood KAC-M3004

Dimensions  7-5/8″W x 1-13/16″H x 3-7/8″D
Number of channels 4
Frequency range 20 – 20 kHz
Power Handling 
  • 50 watts RMS x 4 at 4 ohms
  • 75 watts RMS x 4 at 2 ohms
  • 150 watts x 2 bridged at 4 ohms
Bridgeable No
Amplifier Class D

Kenwood is another well-established car stereo brand that offers quality car audio component at reasonable prices. We’ve reviewed a ton of Kenwood products including speakers, receivers, and amps on this site before, and truth be said, kenwood makes quality, top-notch components.

The KAC-M3004 is one of the best compact car amplifiers in the Kenwood KAC series of amps. This 4-channel car amp will power up the music in your vehicle with 50 watts RMS per channel at 4 ohms. Or, you can switch it to 2 channel mode and send up to 150 watts RMS each to a pair of subs, or a pair of power hungry component speakers.

This mini car amplifier uses class D circuitry design which makes it quite efficient. Its conformal-coated circuit board makes it suitable for a variety of applications including cars, motorcycle, ATVs, power sports as well as marine applications.

This compact 4 channel amp has variable high- and low-pass filters so you can get a well-balanced sound from your system. It also has preamp and speaker-level inputs which lets you hook this amp up to almost any car audio system.

All in all, the Kenwood KAC-M3004 is a great little amp! It’s super compact and great for tight spaces. It was not designed to be the loudest and most powerful amp, but it’s just right for those who want something a bit more at an affordable price.

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3. JBL GX-A604

Dimensions  11-13/16″W x 2-1/16″H x 8-1/8″D
Number of channels 4
Frequency range 20 – 20 kHz
Power Handling
  • 60 watts RMS x 4 @ 4 ohms
  • 85 watts RMS x 4 @ 2 ohms
Bridgeable Yes
Amplifier Class AB

JBL is and always has been the go-to-brand within the audio space. They’ve been around for a very long time, so they know a thing or two about power. They’re actually very popular when it comes to portable wireless speakers.

In addition to portable speakers, JBL also offers a wide selection of car audio components including speakers, subwoofers, audio processors and amplifiers.

The JBL GX-A604 is one of the best mini 4 channel amp that JBL have to offer. At 11-13/16″(W) x 2-1/16″(H) x 8-1/8″(D), this small amplifier can easily fit into the tightest spots in your vehicle, which makes it an excellent solution to power your car sound system without sacrificing valuable space.

This amplifier can send up to 60 watts RMS to each of your front and rear speakers at 4 ohms. It can also send up to 85 watts RMS x 4 at 2 ohms, which is about five or six times the power of most factory headunits.

Furthermore, this versatile 4 channel amp can be used in 3-channel mode to drive a pair of component speakers while sending up to 170 watts RMS to a sub.

The JBL GX-A604 comes with speaker-level inputs, which makes it perfect for powering your stock sound system. It also comes with high-pass filter to prevent extreme low notes from reaching your speakers allowing them to play louder and cleaner, and most importantly without distortion.

Additionally, you can switch the rear filter to low-pass mode when you’re driving a subwoofer, while the built-in bass boost adds some punch when you’re in the mood.

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4. Kenwood KAC-M1824BT

Dimensions  6-11/16″W x 1-13/16″H x 3-7/8″D
Number of channels 4
Best frequency response 20 – 20 kHz
Power Handling
  • 45 watts RMS x 4 @ 4 or 2 ohms
  • 90 watts RMS x 2 bridged @ 4 ohms
Bridgeable Yes
Amplifier Class D

If you’re looking for great mini car amp that’s built to withstand harsh outdoor conditions, we can’t think of a better option than the Kenwood Kac-M1824BT.

The amp at hand is marine certified. It’s fitted with a conformal-coated circuit board to keep out moisture and salt which makes it suitable for ATV, Motorcycles and boats.

At 6-11/16″W x 1-13/16H x 3-7/8″D, this 4-channel amplifier will neatly fit even the most limited installation spots. It will pump up your audio system with 45 watts RMS per channel — that’s more than twice the power output of most car stereos.

With today’s smartphones hosting a wide variety of listening choices such as stored music, internet radio, podcasts, etc., it is no wonder that we all want to use our smartphones as a primary listening source.

That said, the amp at hand is featured with wireless Bluetooth connection, so you can play your tunes without the need for a receiver. Additionally, it comes with a USB port to let you recharge your device, so you won’t miss a beat of the fun.

Its IPX-5 rated remote control is built to be mounted in places that are exposed to the elements. This wired remote controls the volume and track selection.

That’s not to say that this amp doesn’t work with a receiver. Quite honestly, it comes with RCA connections so you can use it with an aftermarket receiver. It also comes with speaker-level inputs, so you can still pair it to a receiver without RCA outputs.

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5. Alpine KTP-445

Dimensions  2-9/16″W x 1-1/2″H x 7-13/16″D
Number of channels 4
Best frequency response 20 – 20 kHz
Power Handling 45 watts RMS x 4 @ 4 ohms
Bridgeable Yes
Amplifier Class D

If you want more power with less hassle, Alpine KTP-445U Power Pack is a great option to consider. It’s going to be the smallest pick of the lot by far.

At only 2-9/16″(W) x 1-1/2″(H) x 7-13/16″(D), this compact 4-channel amp is designed to be small enough to fit into some sort of nook and cranny inside the dashboard of most vehicles where most amplifiers won’t.

This alpine mini amp is designed to be an easy way to increase your receiver’s power output to 45 watts RMS by 4 channels. That is a significant jump up from the around 20 watts per channel typically put out by most car receivers, and enough power to drive your power hungry speakers. Best of all, this compact amplifier is so efficient and you can run it off the same circuit that powers your receiver, assuming that the fuse that protects the radio is 15 amps or higher. Otherwise, you’ll need to run a separate power wire to the battery to install this amp.

The KTP-445U can be switched to 2- or 4-channel mode. It comes equipped with switchable RCA or speaker-level inputs, selectable high-pass filters, front and rear gain controls.

All in all, Alpine KTP-445 is wonderful for upgrading the sound of a headunit without taking up much space. It’s not going to win that “audio sound off competition”, but it’ll deliver enough power to rock out most “daily driver” type cars.

This amp is meant for vehicles with very limited space. It’s quite easy to install and it’ll save you from the hassle of running all the power lines and grounds. We do think you get a lot of bang for your buck with this Alpine power pack.

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6. Pioneer GM-D8701

Dimensions  10-3/8″ x 2-3/8″ x 7-7/8″
Number of channels 1
Best frequency response 20 – 20 kHz
Power Handling
  • 800W RMS x 1 @ 1 ohms
  • 500W RMS x 1 @ 2 ohms
  • 300W RMS x 1 @ 4 ohms
Bridgeable N/A
Amplifier Class D

Pioneer is one of the most renowned car audio brands in the industry. The’ve been in business for decades and offer a wide selection of car audio components.

The GM-D8701 is Pioneer’s newest, most advanced class-D amplifier, marking a dramatic improvement in power output capability, yet quite compact and efficient.

The mono amplifier at hand is incorporated with an improved circuit design allowing for stable performance under normal and heavy load.

This mini class D amplifier can pump out up to 300 watts at 4 ohms, 500 watts at 2 ohm, and up to 800 watt at 1 ohm, which is more than enough to drive mid-size subwoofer.

For extra flexibility, this mono block amp comes with variable LPF (40 Hz to 240 Hz) which makes audio frequencies more adjustable according to subwoofer characteristics and personal listening preferences. It also comes with RCA inputs, speaker level inputs for easy integration with OEM units, and a wired bass boost remote control for optimal bass level adjustment according to listening preferences and music characteristics.

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7. Rockford Fosgate R500X1D

Dimensions  8-1/2″W x 2″H x 7-3/8″D
Number of channels 1
Frequency response 20-250 Hz
Power Handling
  • 300 watts RMS x 1 @ 4 ohms
  • 500 watts RMS x 1 @ 2 ohms
Bridgeable N/A
Amplifier Class D

If you’re looking to scale up (power output wise) from the PBR300X4 (Linked to above) but don’t need anything massive, Rockford Fosgate has plenty of other choices available. One of the more popular options available is the R500X1D.

Rockford Fosgate R500X1D is one of the top-rated mono-block amplifiers in the market. It’s a great bang for the buck if you’re not looking for something massive.

At 8-1/2″(W) x 2″(H) x 7-3/8″(D), this amp has a lot of punch to offer for its size and it comes with all the bells and whistles.

Speaking of which, this amp is featured with low-pass filter and Rockford Fosgate’s famous Punch boost to get the best possible bass from your sub/enclosure combo. It also with speaker-level inputs yo sou can hook this amp up to almost any OEM or aftermarket system. Additionally, the included wired remote lets you control the amp’s volume level from the front seat.

To ensure long lasting performance, this amp uses heavy cast aluminum chassis to efficiently dissipate heat away from its internal components. Further, the R500X1D’s built-in sensors keep track of the output current and power supply temperature, ensuring that your sub’s plunging impedances or even a short circuit won’t hurt anything.

Performance wise, this Rockford Fosgate mini amp can drive a sub with up to 500 watts RMS, so you can really feel your bass rockin’.

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8. Kicker 43CXA3001

Dimensions  8-1/8″W x 2-3/8″H x 6-3/4″D
Number of channels 1
Frequency response 20 – 200 Hz
Power Handling
  • 150 watts RMS x 1 @ 4 ohms
  • 300 watts RMS x 1 @ 2 ohms
Bridgeable N/A
Amplifier Class D

Kicker is one of the most trusted names in the car audio industry. If you’ve been shopping for car speakers or subwoofers, then you must have come across Kicker. They’re inescapable, and omnipresent in any car audio store, and that’s no coincidence. With every product carefully thought of, well-designed and manufactured to perfection, it isn’t even a surprise that this brand made a name for itself in the market. Best of all, Kicker has remained affordable through the years.

Kicker offers a wide selection of car amplifiers for every purpose. What we have here is a monoblock amplifier that can send up to 300 watts RMS to your subwoofer at 2 ohms.

At 8-1/8″(W) x 2-3/8″(H) x 6-3/4″(D), this kicker mini amp will easily fit into the tightest and tiniest of spaces. It comes with mounting hardware that lets you mount it vertically, so it doesn’t take up much floor space.

Thanks Kicker’s Fail-Safe Integration Technology (FIT™) which has made itself a staple in stress free amplifier installations, you can tap into your speaker wires for a signal without a worry. This means no Line-Out Converts, Step Down Modules, Processors, “customized wiring”, or reliance on precarious ‘high level inputs’ on other amplifiers.

Kicker 43CXA300.1 is featured with variable low-pass filter to get maximum performance from your sub/enclosure combo. It also comes with fixed subsonic filter to get rid of extreme low resonances that cause distortion. Its variable bass boost allows you to add some low-end punch if you need it, while its wired remote (sold separately) lets you conveniently adjust the bass level from your front seat.

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9. JL Audio Jx500/1d

Dimensions  7-7/8″W x 2-1/8″H x 7-11/16″D
Number of channels 1
Frequency response 10 Hz – 150 Hz
Power Handling
  • 300 watts RMS x 1 @ 4 ohms
  • 500 watts RMS x 1 @ 2 ohms
Bridgeable N/A
Amplifier Class D

We’re ending this list with yet another American brand that has earned respect through the years. JL Audio was founded in 1975 and manufacturers a wide variety of electronics and audio equipment including speakers, subs, amps, and processors.

At 7-7/8″W x 2-1/8″H x 7-11/16″D, the Jl Audio Jx500/1d is one of the most compact mini subwoofer amplifiers out there. Despite being quite small, this beast will deliver up to 500 watts RMS (at 2 ohms), so you can experience thunderous bass in your music.

With great power comes great responsibility, that’s this amp is incorporated with high-grade parts that provide high current flow, allow for stable performance in almost any situation, and ensure excellent heat management.

Speaking of heat management, this amplifier’s high-mass aluminum heatsink keeps things cool enough to prevent thermal shut-downs.

Targeted specifically for subwoofers, this JL Audio mini amp comes with a low-pass filter with continuously variable cutoff frequency selection from 50-200 Hz. It also comes with a variable bass boost at 45 Hz.

For easy integration with OEM and aftermarket head units, the JL Audio JX500/1D is featured with hi-level inputs and conventional low-level RCA inputs.

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10. Pyle PLA2200

Dimensions  15-3/4″L x 10-5/8″W x 1-7/16″H
Number of channels 2
Frequency range 15-30k Hz
Power Handling 
  • 80 watts RMS x 2 at 4 ohms
  • 140 watts RMS x 2 at 2 ohms
  • 160 watts x 1 bridged at 4 ohms
Bridgeable Yes
Amplifier Class D

If you’re on tight budget and looking for cheap small car amplifier that doesn’t cost an arm and a leg, then Pyke PLA2200 is a decent option to consider. At most retailers, this 2 channel amp can be found for under $50.

Pyle PLA2200 is an entry level amplifier. It can deliver up to 80 watts per channel at 4 ohms, 140 watts at 2 ohms, and up to 160 watts when it’s bridged.

This isn’t the most powerful amp out there, however it’s good deal for the buck. It’s very thin and it’ll easily go under a seat or behind one. It’ll perform well as long as you’re keeping it in its spec range .

This mini car amp comes with variable high- and low-pass filters, as well as subsonic filter. It also has a switchable bass boost (0 to +18 dB) which lets you apply some extra low-end punch.

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Final Thoughts

Finding the right amplifier for your car can be a daunting task. The sheer number of car amplifiers available online or in the electronic stores is enough to make your mind spin. There is a number of things you need to take into consideration to get yourself a good car amp.

If you’re limited in space, you have to take that into consideration as well. Luckily for you, we’ve limited the choices to a few great mini car amplifiers in hope to help you make an informed buying decision.

Alex Brown

Hey There, my name is Alex Brown, I'm a music lover and a car audio enthusiast who loves everything from new receivers to car security. I've been in this industry for years now. I enjoy creating solutions and simplifying everyday needs. My passion for music came at an early age. I love helping people get great sounding gear, thereby, saving the world from bad sound one customer at a time.

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