Reviews

Best Motorcycle Amplifiers: Rev Up Your Bike and Your Music

These motorcycle amplifiers sound great and take up little space

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BY Mike Knott , Noelle Talmon / LAST UPDATED ON June 8, 2021

The best motorcycle sound systems include an amp that performs similarly to the types of amps used in your car or home entertainment system. They are intended to boost your audio system's sound so you can hear clear, loud music when you're riding, particularly at high speeds. Our motorcycle amp buying guide will includes some of the best units on the market.

Best Overall
Pyle Hydra 4-Channel Amplifier
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Summary
Summary

Boost your sound system with this 800-watt waterproof amplifier. It comes with several connectors for versatile system integration. It also has an adjustable input to gain 2-4 ohms. 

Pros
Pros
  • Remote volume control 
  • Bluetooth compatible 
Cons
Cons
  • Large size 
  • Feels weak 
Best Overall
Pyle Hydra 4-Channel Amplifier
Best Value
Kenwood Compact 4-channel Amplifier
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Summary
Summary

This four-channel, 400-watt Bluetooth amplifier will power your motorcycle's sound system with 45 watts RMS per channel. It's compact and will fit in tight spaces.

Pros
Pros
  • This amp sounds great with your motorcycle's stock stereo, and it puts out some decent power for its size
  • Produces a loud, crisp, and clear sound
  • Easy to install
Cons
Cons
  • Speakers may intermittently shut off when you turn it up all the way
  • You can't control the bass levels with this unit
Best Value
Kenwood Compact 4-channel Amplifier
Honorable Mention
Rockford Fosgate Punch 300-Watt, 4-Channel Boosted Rail Amplifier
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Summary
Summary

The Rockford Fosgate is a four-channel, 4-ohm, 300-watt amplifier. It's designed for stereo systems that require little space. Its dimensions are 1.53 inches by 4.25 by 6.75 inches.

Pros
Pros
  • This amp is loud and clear
  • There are separate gain dials for front and rear speakers
  • Fairly loud, even on the highway when riding through the rain
Cons
Cons
  • This amp tends to run hot and can overheat, so it's recommended that you keep it well-ventilated
  • Amp may also stop working after a few months of use
Honorable Mention
Rockford Fosgate Punch 300-Watt, 4-Channel Boosted Rail Amplifier

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Our reviews are driven by a combination of hands-on testing, expert input, “wisdom of the crowd” assessments from actual buyers, and our own expertise. We always aim to offer genuine, accurate guides to help you find the best picks.

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Benefits of Motorcycle Amplifiers

  • Listen to your favorite music. Whether you're cruising around town or taking a longer road trip, the ride can be much more enjoyable if you can simultaneously listen to your favorite tunes.
  • Amplify the audio signal. If you're looking for rich, quality sound, then motorcycle stereo amplifiers are the way to go. They can enhance the audio system on your bike for a more powerful sound.
  • Upgrade your stock system. While many touring bikes come with audio systems already installed, they’re not usually the best you can find. For even better sound, upgrade your motorcycle amp and speakers.

Types of Motorcycle Amplifiers

Wired Versus Bluetooth

A Bluetooth motorcycle amp is convenient because it doesn't require wires for connection and can be used for multiple applications, such as controlling the radio and using it with a Bluetooth-enabled electronic device, such as an MP3 player. While it's not a necessity, a Bluetooth amp can be very useful. Bluetooth establishes the connection, and Wi-Fi generates the data. 

Top Brands

Kenwood

Kenwood Corporation was established in Nagano Prefecture, Japan in 1960. The company designs home audio, car audio aftermarket and OEM systems, in-car entertainment consoles, and other products. Two popular motorcycle amps are the Kenwood Compact Bluetooth Automotive/Marine Amplifier and the Kenwood Compact 4-channel Amplifier.

Rockford Fosgate

Rockford Fosgate was founded in 1973 and is a subsidiary of Rockford Corporation, which is based in Tempe, Ariz. The company designs audio products for automotive, marine, motorcycle, and other purposes. One recommended product is the Rockford Fosgate Punch 300-Watt, 4-Channel Boosted Rail Amplifier.

Boss International Group

Boss Audio is the umbrella group for three major car audio brands: Boss Audio, Planet Audio, and Sound Storm Laboratories. The Oxnard, California-based organization has been around for 30 years. It makes subwoofers, speakers, amplifiers, and mobile video products as well as products for off-road use. One popular amp is the Boss Audio Systems Motorcycle Bluetooth Speaker System.

Motorcycle Amplifier Pricing

  • Under $100: There are a few small motorcycle amplifiers at this price point. However, they may not be as durable or as long-lasting as products that cost just a few dollars more. They likely won’t have Bluetooth capabilities. 
  • $100-$200: Some small motorcycle amplifiers can be costly, but it's worth it if you appreciate a solid audio system. Units on the higher end of this price range will have more controls and are more likely to be Bluetooth compatible.
  • Over $200: If you want to find a premium motorcycle amp, it will cost you. The good news is that many amps that cost a few hundred dollars also include speakers and/or other elements to complete your audio system set up.

Key Features

Size

Motorcycles vary greatly in their size and the amount of space they allow for an audio system. The best motorcycle amp will have the correct dimensions to fit properly on whatever type of bike you ride and wherever you want to put it. You will want to make sure you select a device that seamlessly fits alongside the rest of your audio equipment.

Weatherproof

Even if you prefer riding in sunny weather, there's a good chance you will be exposed to a variety of weather conditions. A bike amplifier should be designed to repel rain, snow, dust, and other elements. In addition, amplifiers for motorcycles must have the ability to endure a lot of vibrations.

Power Ratings

When selecting bike amps, pay particular attention to the peak power, which is often referred to as maximum output. The RMS power rating indicates the continuous power an amp can generate. Do not be seduced by inflated power ratings. One way to do this is by choosing a unit that's certified by the CEA (Consumer Electronics Association).

Other Considerations

  • Number Of Channels: When you purchase a motorcycle stereo amp, you need to pair it with some speakers. The amp has to be designed to power your system properly. A stereo amp with two channels is the most common; however, a four-channel amp will give you more options. You can choose between one and six channels.
  • Easy Installation: Select a unit that is adjustable. The best motorcycle amplifier should be easy to install and include mounting brackets or other hardware that allows you to put it on your bike without much stress. This goes hand in hand with the design and the size of the amp.

Best Motorcycle Amplifier Reviews & Recommendations 2021

Best Overall
Pyle Hydra 4-Channel Amplifier

Give your stereo system a boost with this four-channel 800-watt waterproof amplifier. This marine quality amplifier will deliver high-quality sound reproduction and is universally compatible with a wide range of head units, such as a smartphone or MP3 player. It comes ready for installation with RCA inputs and a 3.5 millimeter RCA adapter. It also has remote volume control. Built-in short circuit protection and soft power on/off help protect both the amp and your motorcycle’s electrical system from short-circuiting. It comes with adjustable input gain level controls of 2-4 ohms. The unit measures 11.5 x 5.75 x 3.75 inches. 


Unfortunately, this unit is larger than other motorcycle amplifiers, making it harder to find the ideal installation place on your bike. It also feels weak when connected to large-sized speakers.

Best Value
Kenwood Compact 4-channel Amplifier

A 400-watt amplifier will power your motorcycle's sound system with 45 watts RMS per channel. It's compact, will fit in tight spaces, and has plastic plugs to protect the connections and a conformal-coated circuit board to keep moisture out.  It comes with an RCA cable to connect to a receiver but also handles speaker-level signals. This amp sounds great with your motorcycle's stock stereo, and it puts out some decent power for its size. It's easy to install and produces a loud, crisp, and clear sound. You can pack this amp, a receiver, and other items into a Harley-Davidson or other type of forks bag without a problem. It comes with a wiring kit, and there is no humming through the speakers.


One problem with this amp is that the speakers may intermittently shut off when you turn it up all the way. Also, you can't control the bass levels with this unit, and it lacks a speaker relay to prevent that thumping sound when you turn it on or off, which can be annoying.

Premium Pick
Rockford Fosgate Punch 300-Watt, 4-Channel Boosted Rail Amplifier

The Rockford Fosgate is a four-channel, 4-ohm, 300-watt amplifier. It's designed for stereo systems that require little space. The device is just 1.53 by 4.25 by 6.75 inches. It features high- and low-level inputs with variable 4-6 volt high-level DC offset voltage input turn-on control. It comes with a one-year limited warranty. This amp is loud and clear, and it has high pass and low pass filters set at 80hz. There are separate gain dials for front and rear speakers, and it's fairly loud, even on the highway when riding through the rain. There's also no distortion. You can crank your music all the way up, and it’s small enough to fit on top of the stereo.


There have been some complaints that this amp tends to run hot and can overheat, so it's recommended that you keep it well ventilated. Also, when it gets too hot, it will shut itself off, which is good for safety but means your music shuts off too. The amp may also stop working after a few months of use.

Most Versatile
Herdio Store 500 Watts 4 Channel Motorcycle Amplifier

This four-channel amplifier is meant for marine applications, but it can also be used on your motorcycle. The durability required for marine use makes it suitable for motorsports. The amplifier measures 7.9 x 1.88 x 3.77 inches. It has a maximum power of 180 watts. You’ll appreciate the high-quality sound reproduction that this amplifier helps to deliver. It’s capable of 4-ohm impedance and has a frequency range between 20-25KHz. It has class A/B, low-level inputs, RCA pre-amp outputs, and aux input for connection versatility. You’ll appreciate the sleek black design of this amplifier that helps it blend into the design of your motorcycle. 


The downside of this amplifier is that it doesn’t have as much power as other amplifiers on this list. It also lacks some of the sound adjustability features that other amplifiers have.

Honorable Mention
Stinger 4 Channel 700 Watt Powersports Amplifier

This micro four-channel amplifier is designed for mounting on your motorcycle. It has a small footprint measuring 8.5 x 7.75 x 3.03 inches with die-cast endcaps and removable mounting feet. It has volume and mute functions for the rear channels. It has a full range of class D unregulated power supply with aux RCA output. This lets you link to additional amplifiers. It’s rated IPX-4/5 to make it water-resistant and durable enough for use on your motorcycle. For performance, it operates at 8-16 volts, 350x2 at 4 ohms, 175x4 at 2 ohms, and 125x4 at 4 ohms.


One drawback of this amplifier is that the connector threading could be longer for a better and more secure installation. The cable can also be too short for some larger motorcycles.

Tips

  • The amp's wattage must be the same or greater than that of the speakers. This is to avoid distortion, which can occur when speakers are too powerful for the amp.
  • Ensure that the RMS and the voltage match. Motorcycle amps use 12-volt power sources, and they need to be compatible in order to function properly.
  • The best motorcycle amplifier will have high and low pass filters, a bass boost, and speaker level inputs that allow you to customize your sound. An EQ will also enable you to adjust the sound to your liking.
  • During installation, you may want to use a relay on your power amplifier. Hook it up to a switch on accessory power and then run the power from the relay to the battery. 

FAQs

Q: Where do I install a motorcycle amplifier?

A: Choose a location where you can easily access the amp. Options include the saddlebag, handlebars, and tank bag. The most important thing is to make sure the audio inputs are accessible for use with a smartphone, USB device, etc.

Q: Does a motorcycle amp need to be wired directly to the battery? 

A: Depending on what type of amp you purchase, you can wire it to the battery or directly to the deck power supply.

Q: Will mini amplifiers for motorcycles fit on a fairing? 

A: This can vary, depending on the size of the amplifier and the amount of space you have on your fairing, but many motorcycle amps can easily be mounted above the head unit.

Final Thoughts

Our pick for the best motorcycle amplifier is the Pyle Hydra 4-Channel Amplifier, with its 800 watts of power and several connectors for system integration.

For a more budget-friendly option, consider the Kenwood Compact 4-channel Amplifier.

Let us know what you think about motorcycle amplifiers in the comment section below.