Customer Ratings & Reviews

Installed on 2 cars 1994 Miata and 2005 Scion XB

I installed both amp in both cars and the installation was very easy do to great electrical connectors both cars sound is very good using Pioneer double din touch screen head unit. Sound is very clean and has plenty of power both Amos was installed in the back 94 Miata in the trunk and on the 05 Scion XB also in t h e back. I love the quality of the J&L amps would buy again.

By Marco on March 11, 2023 Verified purchase

Amazing sound!

This amp is phenominal. I am blown away with how well it performs. I believe in name brands when it comes to sound, and J/L hit the nail on the head with this one. I am running two subs bridged in two channel mode and it has a punch. QUALITY like this is meant to be heared. I wonder how great it would sound on my 6x9's. Makes me wish i still had my jl1000/1 to pair it with. Thanks sonicelectronics! You made my day.

By Ethan on August 7, 2021 Verified purchase

You cannot go wrong with this one.

I had been driving around in my Tundra for 3 years with the stock system. Friend picked my up one day with a proper system installed and I started researching parts the next day. Ended up completely stripping the interior out and upgraded from front to back.
Kenwood DDX9907XR HU, Focal Focal ES 165K components up front, JL coaxes in the rear, JL Audio CS112LG-TW3 Sub powered by a JD500/1 and this amazing little JD400/4 pushing the components and rear fill.
To say I am impressed by this amp is an understatement. JL made setting the gain idiotproof and this will play as loud and clear as my 51 Y/O ears can handle.
Cannot recommend enough.

By Ken on March 3, 2022 Verified purchase

Awesome Service

Was able to order a rush order and this amp in a breeze... Travis was so friendly and helpful, will highly recommend Sonic Electronix.

JL Audio JD400/4

Clear sound, very pleased.. Easy install, instructions need to be worked on a little..

By Barton on August 10, 2020 Verified purchase

Unbelievable!!!!!!

JL Audio has always been an awesome brand and even better when you can get it at a great price!!! Thank you Sonic Electronix!!!!

By Eddie on October 6, 2022 Verified purchase

Very happy!

Paired with my JL C2 650's, this thing rocks! Super easy to install and delivers that JL quality that you know you're always gonna get. For the price, you can't beat this baby!

Looks and Feels Awesome!

Have not installed this amplifier yet, but based on JL's reputation for quality and the look and feel of this amplifier I know it will perform well.

By Roberto on August 3, 2020 Verified purchase

Nice amp.

Wow! I'm amazed at how this amp got highs & mids sounding crispy and very detailed. I highly recommend this 4 channel amplifier to anyone who looking for one. And the price is very reasonable as well. Two thumbs!!

By Anthony on May 2, 2022 Verified purchase

Immediate Upgrade!

Buy, buy, buy! You get what you pay for. All 400/4 amps are not the same. JL for the win.

By Reyze on May 14, 2023 Verified purchase

Sonic is the only place I do business with after initial order

This amp is outstanding, clipping feature allows you to get the most out of your amplifier

By Dominick on April 29, 2022 Verified purchase

Amazing amp!

Is hooked upto 4 Kappa 60 CXM's. These speakers sound amazing on this amp. Is easy to setup and use...great for the money!

By Chris on September 7, 2023 Verified purchase

Unreal quailty

This amp is awesome. The sound in quality is like You’re in person

By Matt on October 29, 2024 Verified purchase

Great Value.

Great Value. Fast shipping. Plenty of power for four door speakers.

By Matt on January 6, 2026 Verified purchase

Excelente

Todo llego sin ningún problema ,a mejorado mi experiencia de audio por completo, ahora solo a disfrutar

By kys on December 9, 2025 Verified purchase

Quite an improvement

I have a 2012 Toyota Tundra with a Kenwood DDX5707s h/u, Focal 165AS3's in the front, some and Pioneer Ts-a1687s 6.5" in the rear. I installed a Planet Audio PL1600.4 class D amp to power it all. It was ok, but I knew those Focals could do much better. Then that amp just died on me. It had not even been installed in my truck for a year. I do go 4x4'ing on the beach, but we don't get hot here in NorCal.

I installed the amp in the same location as the PL1600.4 and the JD400/4 takes up less space under the passenger seat. My first impressions are that the Focals do not sound like the tweeter is pulling double-duty. The mids and the woofers are much more balanced. This is a very clean sounding amp. So far I am very impressed. Bass is next on the list.

By Tim on October 10, 2025 Verified purchase

Powerful, Clean, and Reliable – Perfect 4-Channel Amp!

This amp completely transformed my sound system. The JD400/4 delivers clean, detailed power to all my speakers, with zero distortion even at high volume. Setup was straightforward, and the controls are intuitive. I’m running Hertz and MB Quart speakers and this amp pushes them effortlessly. JL Audio never disappoints – solid build, great performance, and unbeatable clarity. Highly recommended for anyone upgrading to serious sound.

By Boris on August 6, 2025 Verified purchase

Awesome Amplifier

I purchased a JL Audio JD400 amp, and I must say it was super easy to install, very easy to adjust and amazing sound quality, I've always had a wonderful experience when ordering from Sonic Electronics , I will be a customer for life, if your in the market for a amplifier this is a great one to get for a good price, thanks for the fast shipping and great customer service.

By Bensil on May 31, 2025 Verified purchase

JL Audio

Installed and works fantastic!

By Julio on January 9, 2025 Verified purchase

Jl audio never fails .

Has Jl audio amps before and decided to go with it again on my work truck .

By Jose on December 9, 2024 Verified purchase

It’s JL audio tried and true brand

Compact 4 channel to run my components is just what I needed. Shipping was crazy fast thank you!!

By derek on July 20, 2024 Verified purchase

Great amp for mods and highs

For Tia installed and it is great! Easy to set up and the filter works great and the mods and jigs never sounded so good! Very well pleased and shipping was extremely fast!

By Shane on April 9, 2026 Verified purchase