Customer Ratings & Reviews

Great Deal on a great product

I could not be happier with this amp. True quality from top to bottom. The sound is fantastic. I used this as a full range four channel amp to drive four kicker speakers. It gets its signal from the factory Nissan HU which is a very low quality HU in my opinion. I decided to try to keep the factory HU due to the factory steering wheel controls, bluetooth and stock look for theft deterrent appearance. I found the front channels on the HU clipped out way early compared to the rear when setting up the amp. So i switched the amp to 2 channel input / four channel output the set it up with the clip lights ....and perfection! What a great feature. I am very happy.

By Gerry on March 16, 2017 Verified purchase

Great Product

Pros: Easy to install, all the needed features, underrated.

Cons:None.

By Dustin on February 8, 2018 Verified purchase

Amp

Very pleased so far.. sounds just as my amp that I replaced.. easily installed, with a very small space required for installation... don't know about durability yet.. but we will see.. for the $$ and power/size ratio I would recommend this amp to anybody.. JL makes some of the best

Nice

Very good sound quality amp and small enough to put under the seats

By Anonymous on March 30, 2019 Verified purchase

JL Audio Class-D 4-Channel RD400/4

Great prices on great equipment and Fast delivery thanx sonic

By Anonymous on March 6, 2019 Verified purchase

Excellent app at a great price. Fast delivery also!

I needed the amp I bought quickly and Sonic Electronix was the only company that had it in stock and at the right price.

Great amp, shipped fast. 100% satisfied.

By David on August 7, 2020 Verified purchase

JL Audio Class-D 4-Channel RD400/4

I would recommend this amp it sounds so clean!!!! I have it running 4 6.5 Phoenix gold coaxal speakers I have had this amp for 6 months and works perfectly.

Excellent price Great power

This amp was a great price and I love the convenience in size. I replaced my factory amp and the Boston acoustic speakers now sound like high-end audio. Very easy to install and with the new clipping feature I have no issues. Will be buying another soon.

By Christopher on March 19, 2020 Verified purchase

Open box saved me $70

JL lives up to their reputation again. Replaced my kicker 4 channel with this amp. A smaller footprint operates at a cooler temperature, and all of the wirings is on one side for cleaner wire installation.

By Christopher on January 24, 2021 Verified purchase

Sounds good for the money

Using this in conjunction with an RD1500 in a regular cab Silverado. Not yet installed but it is running on my test bench on a set of Kicker's bookshelf demo speakers. Good, clean sound and plenty of power while running in 2 channel mode.

Shipping and customer service experience was not what I expected; both were slower than promised. Product is great.

By Ryan on November 24, 2021 Verified purchase

Great amp

Works as advertised and put out the power. Looks good too!

By Lou on December 31, 2016 Verified purchase

Awesome!!

By Michael on December 8, 2022 Verified purchase

Great amp

Got this amp to replace old one. This amp is very powerful, clean, and sounds great.

By Anonymous on September 3, 2018 Verified purchase

JL AUDIO Quality absolutely

Clear sound, power and quality on my jl audio c2-650 components

Great Amp

Purchased amp to power focal 6.5 components, and 6.5 coaxial door speakers. Sounds wonderful, works like a charm.

JL Audio RD 400

Replaced an RD 900/5. Running C2 6.5 mid and tweet. In my opinion the separate amp performs better than the all in one. I updated my entire system, with the exception of the Epicenter, and it just sounds louder and clearer with everything having its own dedicated channel. The RD is easy to set the input gains , has a small form factor and gets more than enough power using 4 gauge power and ground cables.

By TW on May 28, 2024 Verified purchase

Sleek amp!

The weight of it is very nice. Doesn’t feel cheap at all!

By Kolby on August 3, 2024 Verified purchase

Great price?

This was not only a good price but arrived quickly.Cant go wrong with JL audio amps at a good price!!!.Lower than eBay and Crutchfield .

By Luis on September 19, 2025 Verified purchase

Superior !

From someone who's been into audio for many, many years, JL has the best amplifiers bar none. Crystal clear, clean, powerful, efficient, precise, solid. Dont buy anything else. And Sonic Electronix has a great selection to choose from!

By Danny on January 9, 2025 Verified purchase

Clean and clear sound!!!

By Gerardo on August 8, 2024 Verified purchase