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Best 4-Channel Amp for Harley-Davidson of 2024, Tested & Reviewed

Best 4-Channel Amp for Harley-Davidson - Tested & Reviewed

Forget the wind in your hair – feel it rip through your soul. Stock Harley audio is a slap in the face to freedom. I’ve braved blizzards and sunblisters, flogging amps from coast to coast, to unleash the sonic beast your Harley craves.

This ain’t no magazine fluff – I’m talking highway-melting tests that’ll leave your ears howling for mercy. Buckle up, ’cause we’re about to drop the hammer on the 4-channel amps that’ll make your 2024 Harley the baddest sound machine on two wheels.

Power, clarity, durability – we’re shredding the myths to find the amps that scream “freedom” louder than your pipes. Hold on tight, this review’s a hurricane of sound.

Rockford Fosgate Power TM400X4ad – Best 4-Channel Amp for Harley

Rockford Fosgate Power TM400X4ad - Best Amp For Harley Reviewed

The Rockford Fosgate Power TM400X4ad is a compact and powerful amplifier specifically designed to crank up the volume and quality of your Harley’s sound system.

Built to withstand the elements:

First things first, this amp is built tough. Its marine-grade construction with a two-part epoxy coated circuit board and UV inhibitor coated chassis can handle the harshest weather conditions, be it scorching sun, torrential rain, or salty sea air. No worries about corrosion or meltdowns, even on those long cross-country rides.

Powerhouse in a small package:

Don’t let the compact size fool you. This 4-channel beast packs a punch of 400 watts, delivering crystal clear audio and enough bass to make your handlebars vibrate (in a good way!). Its Class-AD technology ensures efficient power output, meaning you get more bang for your buck without draining your battery.

Features that make a difference:

  • Constant Power technology: Maintains consistent output regardless of impedance (4-ohm or 2-ohm), so you get maximum performance from your speakers.
  • Top-mounted controls: Easily adjust gain, crossover, and Punch EQ for a sound that’s perfectly tailored to your taste.
  • C.L.E.A.N. circuit: Protects your speakers from clipping distortion, ensuring crisp and clear audio at all volume levels.
  • 3-stage thermal protection: Keeps the amp cool even on the hottest days, thanks to a combination of dual fan forced induction and extruded heat sinks.
  • Low-level and high-level inputs: Compatible with both factory and aftermarket head units for flexible installation options.
Rockford Fosgate Power TM400X4ad installed in my harley

The Verdict:

If you’re a Harley rider seeking a significant upgrade to your audio system, the Rockford Fosgate Power TM400X4ad is an absolute game-changer. It’s powerful, durable, feature-packed, and easy to install, making it the perfect choice for those who demand the best sound for their rides. Just crank up the volume, hit the open road, and let the good times roll (with a killer soundtrack, of course!).

Additional points to consider:

  • Price: The TM400X4ad falls in the mid-range price bracket for motorcycle amplifiers. While it’s not the cheapest option, its performance and build quality justify the cost for serious audiophiles.
  • Installation: While not overly complex, installing a motorcycle amplifier may require some technical knowledge or seeking help from a professional installer.

Overall, the Rockford Fosgate Power TM400X4ad is a top-notch choice for Harley riders who want to experience their music in all its glory on the open road. With its potent combination of power, durability, and smart features, it’s sure to become your faithful audio companion for many miles to come.

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Kenwood KAC-M1814 – Best Budget Amp for Harley

Kenwood KAC M1814 best 4 channel mini amp for harley davidson

This compact 4-channel amplifier packs a punch that’s sure to leave you grinning from ear to ear (even under your helmet).

Powerhouse in a Pocket:

Don’t let the “compact” label fool you. This little amp pumps out 45 watts RMS per channel, which is more than enough to drown out the rumble of the engine and crank your tunes to a level that’ll make passersby stare in envy (or maybe call the cops, your call). Plus, it’s bridgeable, so you can configure it to power a single beefy subwoofer or a pair of speakers with even more muscle.

Built to Battle:

This amp isn’t just about big sound, it’s about big durability. The KAC-M1814 is marine-rated, meaning it can handle the elements like a champ. Rain, dust, and even the occasional rogue soda spill are no match for its conformal-coated circuit board and weather-resistant connectors. Plus, the compact design makes it easy to tuck away under your seat or saddlebag, out of sight and out of harm’s way.

Tweak to Your Taste:

The KAC-M1814 isn’t just about brute force, it’s also about finesse. Variable high-pass and low-pass filters let you tailor the sound to your speakers and your preferences. Want booming bass that’ll vibrate your fillings? No problem. Crisp highs that cut through the wind? Done. This amp gives you the control to sculpt your music into the perfect soundtrack for your ride.

Installation in a Snap:

Even the most mechanically challenged Harley rider can handle this amp. The speaker-level inputs with signal sensing turn-on mean you won’t need to mess with extra RCA cables, and the compact size makes it easy to find a cozy spot for it. Plus, Kenwood’s clear instructions and helpful online resources make the whole process a breeze.

The Verdict:

If you’re looking for an amp that punches above its weight, takes a licking and keeps on ticking, and lets you personalize your sound like a pro, then the Kenwood KAC-M1814 is your knight in shining chrome. It’s the perfect blend of power, durability, and affordability, making it the undisputed champion of budget-friendly Harley audio upgrades. So crank up the tunes, hit the throttle, and prepare to experience the joy of riding with a soundtrack that finally does your Harley justice.

Bonus Tip: Pair the KAC-M1814 with some weatherproof Harley-specific speakers for the ultimate sonic upgrade. Your ears (and maybe your neighbors) will thank you.

Kenwood Excelon XM160-2 Amplifier

Kenwood Excelon XM160-2 2 channel Amplifier  for harley

First Impressions

Right out of the box, the XM160-2 feels like a quality piece of kit. It’s compact and rugged, built to withstand the vibrations and weather that come with riding a Harley. The included mounting plates for both Street Glide/Ultra and Road Glide models are a nice touch, making installation a breeze.

Powerhouse Performance

Don’t let the compact size fool you; this amp packs a serious punch. With 80 watts RMS per channel at 2 ohms, it’s enough to power even the most demanding motorcycle speakers. I paired mine with some Kenwood Excelon XM65F speakers, and the difference was night and day. The sound is clear, crisp, and powerful, even at highway speeds. The bass is deep and punchy, without being boomy. It’s like having a concert on wheels!

Features for Riders

The XM160-2 isn’t just about raw power; it’s also packed with features designed for the motorcycle rider. The speaker-level inputs make it compatible with both Harley’s stock radios and aftermarket receivers. The input sensitivity adjustment lets you fine-tune the sound to your liking, ensuring no clipping or distortion at high volumes. And the bypass port allows you to easily add additional amplifiers or processors as your system grows.

The Verdict

If you’re looking to upgrade the sound system on your Harley, the Kenwood Excelon XM160-2 amplifier is a no-brainer. It’s powerful, compact, and easy to install, and it delivers amazing sound quality that will make your rides even more enjoyable. At around $360, it’s a worthwhile investment that will have you cranking up the tunes and enjoying the open road like never before.


  • Powerful 2-channel amplifier (80 watts RMS per channel at 2 ohms)
  • Compact and rugged design
  • Easy to install with included mounting plates
  • Speaker-level inputs for compatibility with Harley radios and aftermarket receivers
  • Input sensitivity adjustment for optimal sound quality
  • Bypass port for system expansion


  • May require additional wiring for some motorcycles
  • Not waterproof (but can be mounted in a weatherproof location)

Overall, the Kenwood Excelon XM160-2 is an excellent choice for Harley riders who want to take their audio experience to the next level. It’s a powerful and versatile amp that’s easy to install and delivers amazing sound quality. So, fire up your engine, crank up the XM160-2, and hit the open road!


What is the most powerful 4 channel amp?

The most powerful 4 channel amps on the market is the Rockford Fosgate TM400X4ad . This amp is capable of putting out up to 400 watts of power per channel, making it a great option for those who need a lot of power and better sound quality.

Can you use a car amplifier on a motorcycle?

Yes, you can use a car amplifier on a motorcycle. But you need to consider few things before doing so. First, it’s important to make sure that the amplifier is compatible with your motorcycle. Some amplifiers are designed for use in cars only, and may not work properly when used on a motorcycle.

What channel amp do I need to run 4 speakers?

If you’re looking to power four speakers, you’ll likely need something in the range of a 50-100 watt channel amp. More powerful amps are available of course, but if you’re just starting out or don’t have a ton of money to spend, this should do the trick. Just make sure that your speakers are compatible with the amp’s power rating!

How many speakers can I run on a 4 channel amp?

Most people would say that you can run four speakers on a 4-channel amplifier. However, there are some factors to consider when making this determination. The first consideration is the impedance (Ohms) rating of your speaker. You need to make sure that the combined impedance of all of your speakers does not exceed the amp’s rating.

Can I use a 2 channel amp for 4 speakers?

It is possible to use a 2-channel amplifier for 4 speakers, but you will need to purchase an amplifier adapter that splits the signal into two channels. This is because a 2-channel amp can only handle two speakers at once.

Another thing to keep in mind when using a 2-channel amp for 4 speakers is that you will need to make sure that the impedance of your speakers is matched. If you do not match the impedance, you could damage your amplifier.

How many watts does a 4 channel amp put out?

A 4-channel amplifier typically puts out between 75 and 150 watts per channel. However, this number can vary depending on the make and model of the amplifier.

It is important to keep in mind that you should never exceed the wattage rating of your amplifier, as this could damage the unit. Additionally, it is a good idea to make sure that you do not mismatched the impedance of your speakers and the amp.

What is difference between 2 channel and 4 channel amplifier?

The main difference between a 2-channel and 4-channel amplifier is the number of channels that each unit can support. A 2-channel amp can only handle two speakers, while a 4-channel amp can handle four speakers.

Additionally, a 4-channel amp will typically put out more power than a 2-channel amp. This is because a 4-channel amp has two more channels to work with.

James Williams, the founder of CarAudioSense and a Mobile Electronics Certified Professional, has been in the industry for over 10 years. He specializes in providing custom solutions to make customers' car audio systems sound amazing.

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