Customer Ratings & Reviews

Great Sounding Amp

I love the quality of the sound that comes from this amp. I just wished I had the clipping light on this unit as it does on the RD400/4. The only reason I went with the XD400/4 over the RD400/4 is the signal to noise (dB) on the XD amp.
The XD series also comes with a 2 year warranty as opposed to a 1 year warranty on the RD series amps

very nice amp sound clean

Very good amp small and sounds clean

Amazing sound

Matched with JL audio c2 speakers this amp provides great crisp sound. The roll back feature is a cool feature that the amp will never shut off due to heat.

By Mark on February 12, 2024 Verified purchase

Awesome little amp

Needed an amp to fit where the stock Monsoon amp was in a 4th gen f-body. This amp fit on the original amp bracket without any problem. Hooked up to two pairs of jl audio c2-650x coaxials it's the prefect amount of power.

By Andrew J. on February 25, 2018 Verified purchase

This Thing Rules!

This amp is compact, powerful, stays cool, and is very, very efficient. Hook any set of speakers up to this and it will drive them hard with beautiful, clean sound. This unit may be expensive, but you get what you pay for!

Blessing in disquise

I hooked this unit up to my 6.5" components in a 4 channel / 4ohm configuration and was not disappointed in any way. Spend the extra $120 and buy this amp over the competitors. Money well spent in my opinion. I first bought a RF Prime 400w D-class unit that fried in a matter of minutes at 3/4 volume. Thank god it failed because I bought this one instead. Blessing in disquise!

Pros: Sleek look, easy to install, crossover dial detents (awesome!), small size w/big sound.

Cons: Absolutly none that I can think of.

Amazing Amp

I am impressed with the power of this amp, I had two amplifiers rockford fosgate for focal's access and Poliglass, also for a couple of subwoofers jl Audio 12W1, and really did not know what kind of brands buy it. I decided to buy this amp but I was afraid if that brand was I'm looking for. I have a surprise, it's pretty good and quite practical, and has a power that leave me very satisfied

JL AUDIO AMP!

This amp performs great. I have it connected to 2 6x9; 2 6 1/4; and two tweeters which pumps out awesome result with clarity on the vocals and the music tracks. I'm thinking of upgrading to the 600 series because I want to add a woofer for more drop in the bass.

Awesome. Perfectly replaces OEM JEEP JK AMP IN DASH

Perfect !

Surprisingly powerful.

I’m impressed. I was running 3 separate amps to power 4 pair of JL speakers in my doors and one pair in the dash. I replaced them with this amp. Much cleaner looking and sounding. My subs are stronger because I’m drawing less power. My other amps were running warm and shutting down so I like that this has a cool down mode. Easy to hook up and install. The best terminals of any amp. Just ordered one more for my dash and will drive extra tweeters off the other channel. Never hurt to flash JL too.

By Anonymous on August 6, 2018 Verified purchase

clean clean & clear

geese may i just inform you that this amp does not stop the sound quality it delivers is simply outstanding, thank you Sonic for making my music experience pleasurable.

By Anonymous on September 28, 2018 Verified purchase

SQ is great!

I had this amp installed to power my front stage of hertz hsk 165 6.5 in component set speakers and the sound is incredible. Bridged the amp to power just these speakers and it worked out great. Compliments my pair of w6's perfectly. The small design fits perfectly under the drivers seat of my Jeep Grand Cherokee with no problems in the first few weeks. I have a kicker ix 500.4 but do prefer this jl amp.

love it

i have been experimenting with different amps over the past few years and i think this is the one. the small size and efficiency are great and the output is exactly what i have been looking for i have tried lower and higher power this is a good match for me i have no complaints

AMAZING Amp!

Upgraded from an MB Quart 4.80 to this amp, the difference is night and day. Twice the price DOES mean twice the amp in this case! Aside from the power, and the sound quality achievable with this amp, the build quality is second to none. It has a good bit of weight for an amp as small as it is, and the gain & filter knobs are very well made and easy to adjust. Powering Focal access series 6.5" components in the front with Rockford Power series 3-way 6x9's in the back and i couldnt be happier!

Awesome

This is an awesome affordable amp. The ouput of this amp is unbelievable. I compared this to the Alpine PDX4.1 and let me tell you this thing is worth the money and out performs the others. Great amp JL Audio. You out did yourself this time.

Two words... Sound Quality!

I was using a JP 4 channel amplifier prior to installing this. There was this annoying whining sounds when the volume was down. I checked all my grounds and even added a ground to make sure I was good. Sound never went away. I actually tried the class D JP 4 channel and the class AB JP 4 channel amplifiers, they both had that sound. I decided to stop being cheap and get an Amplifier from a reputable company. This amp provides all the power I need to my infinity kappa component sets . Sound is clean, clear, and crisp. Also, that annoying whining sound is gone. It's crazy how quality equipment just performs cheaper equipment in areas other that power. Power is cheap these days but quality of components is not. I was a JL guy back in the 90s but gave some of the cheaper products a shot. Ill put my money of the quality stuff... JL being one of them. Hopefully this review helps someone.

By Joshua on November 5, 2023 Verified purchase

awesome purchase

This amp rocks! Its makes my 2 tweeters, 2 6-1/2 and 2 6x9s sound very clear.

Quality Product

I purchased this amp to replace the factory amp in my 2012 Camaro. The instructions were very easy to follow and clearly stated. The amp has performed flawlessly in the 6 months I have used it. The sound quality is very good, especially for an amp in this price range. I would highly recommend the JL Audio XD400/4 to anyone looking for a quality amp at a great price.

JL XD400/4

Once again JL has lived up to its reputation for providing quality audio products that I can see lasting for many years. When you spend this amount of money on audio gear you don't want it to last a short period of time then fail and you definitely don't want a flop in terms of reproduction quality. If you have come in search for a good quality, compact, and feature rich little amplifier then you have selected the right product.

Great súper amp !!!

By juan on January 14, 2024 Verified purchase

Right Amp, Right Size

Connected this unit to a couple pair of 6.5 components in my crew cab pick up. Sounds great. Replaced an RF Prime xd400.4 that smoked out in about 5 minutes under the same load. This amp was more, but well worth it. Thanks JL Audio and Sonic.

Great value for JL audio and love the compact design!

By Beau on April 26, 2024 Verified purchase

Small & powerful

Awesome little amp with the strength to be heard loud and clear. Powering 2-6.5 & 2- 6x9 component infinity combos.

By Saul on March 19, 2025 Verified purchase

Great product for a great price!

I got a screaming deal for this JL Audio amp and not to mention the quick free shipping!

By Ricky on October 21, 2024 Verified purchase

Awesome Value

This is a great price I had the 5 channel xd version of this style amp. I had also purchased this amp through sonic electronics and it was just rock solid. The only thing is I won’t be installing this amp in my boat till spring time. Can’t wait to rock out!

By Stephen on October 19, 2024 Verified purchase

Nice amp and great price

This was a replacement for another JL Audio amp and so far I am happy with the sound and performance. Easy to install and solid build. Lots of connection options and simple to adjust. I did have to go to a higher rated fuse on the 4awg power wire but no problems otherwise. Will probably get another one for my truck when I get a chance to upgrade that system.

By Anonymous on October 14, 2024 Verified purchase