JL Audio M400/4

Sound is great. Replaced Polk Audio PA660's. The JL's are much better quality and sound. I'm looking to buy another in spring 2021.

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Defective

I must have gotten a defective amp. One of the speaker clips that compresses the speaker wire to hold it in kept falling off so I had to completely removed the amp to put it back in. The second time trying to tighten the speaker wire the clip fell out again. Without the clip there's no way to keep the speaker wire in place. Will be contacting Crutchfield to get a replacement or refund.

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JL Audio M400/4

I installed this amp with 4 M3 speakers on my boat and the sound is awesome!

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Great Company

I'm fortune to have found such a great company that provides great products with exceptional customer service. Couldn't be more pleased. Thank you.

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JL Audio M400/4

Seems nice quality but have not yet installed. Expecting great things however hopefully my dreams become reality

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JL Audio M400/4

Great unit. Very impressed with the sound quality and build quality.

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JL Audio M400/4

Just installed this along with 4 of their speakers. Loved the way you tuned the amp to the head unit

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JL Audio M400/4

This amp is awesome! I hooked up to JL 8.8's with this amp and it's sounds great and clear!

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JL Audio Marine Amps are the best in the business!!!

Let me first off and say that Crutchfield is awesome!. I originally bought 2, Fusion marine amplifiers for my set-up. When I got them in the mail, I realized they were way more powerful than my Fusion 6" speakers could handle. Talked with Crutchfield and explained my situation and requirements. No problem, they emailed me a return label within minutes and by the end of the day, they went ahead and sent me 2 of these amps. Customer service is outstanding!!! I installed these amps. Each amp is powering 4 Fusion MS-FR6022 speakers. I will tell you the sound quality is amazing. These amps push my speakers nice and loud, with no distortion. I blasted my music for hours and still had plenty of battery left over. Prior to my system redo, I had 2 Rockford Fosgate M400-4D (which I did not buy from here) and they were garbage. Within months, both of them started to have channels go out. Sound quality diminished. I cannot even begin to tell you the difference between Rockford Fosgate and JL Audio. Yes, you will pay for the Jl Audios, but save yourself a ton of problems and headaches in the future. I have no doubt that if I have any problem with these amps, between Crutchfield and JL Audio, it will be taken care of. Thank you again

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Great Product...DUH ITS JL!

Big things definitely come in small packages when it comes to this M400/4. I'm powering 4 JL M7.7's on my side by side and this amp rocks those speakers and has handled att the abuse of the trails and mud. I will most definitely be purchasing another in the future for the wife's rig.

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Can't be Topped for Marine Application

Clearest Amp I have ever owned! I have never skimped on my amps but this Marine amp is the best I have ever heard teamed with JL speakers, Blows my old Wetsounds system away.

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JL Audio M400/4

Very powerful and compact. Easy to install! I replaced my old M4300's with 2 new technology M400/4's

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Plenty of power

JL quality. Compact and performs well. Paired with M700/5 with remote bass control. Marine rating definitely needed for the boat. Powering 4 tower speakers bridges off the M400/4. Have to turn down the gain, they are so loud!

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JL Audio M400/4

Nice Amp sounds good, best of all has a small footprint for boat mounting

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JL Audio M400/4

Small, compact, powerful, good design

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Great sound through all volume ranges

I bought the JL Audio M400/4 amp for my 2017 Harley Davidson Road king with a full fairing, I replaced a Rockford Fosgate PBR300/4Amp that was clipping and I was not happy with it's performance. Memo a sales associate with Crutchfield recommended it to me. I rewired the complete radio system with my new amp, It performs beautifully at all volume ranges. It is truly worth the time and money to use this amp. If you want a great sound I highly recommend this for your Harley.

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Powerful little amp.

This a smokin little amp ! Incredibly small yet powerful, very flexible in the way amp can be set up. Clean detailed music when matched to quality speakers like JL MX series marine. Amp seems expensive but worth the price in terms of quality and music reproduction.

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JL Audio M400/4

Only had my new system a week but WOW, sounds great. JL is a leader in marine sound technology and the best part ,made in USA. I'm going to add their 8'' subwoffer to my system.

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JL Audio M400/4 INCREDIBLE CLARITY

Easy installation, the unit will handle just about any input signal including line out from the stereo unit. The wire terminations are very secure and solid all included tools (allen wrench) are provided to terminate wires and secure them. Great clarity and very easy to set up for all audio sources, as long as you have a multi-meter to read the AC voltage.

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Great amp for rzr1000 xp4

Great amp for my rzr. Small with lots of power. Easy to install

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Outstanding couldn't be happier

I bought this item as scratch and dent.. I couldn't find a scratch not dent on the amp. Wired 4 JL MX650's to my head unit first and was disappointed (obviously) then plugged in the speaker wire I had run for the amp. 100x better clearer and LOUD! I probably have the perfect amp for those particular four speakers but the difference was incredible, not to mention the sound is amazing. I highly recommend ALL JL AUDIO MARINE products they're in my opinion the best you can get.

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Awesome tiny-mite!

Powering two jl 7.7 coax's and two channels bridged to power the 10" open baffle sub in our little ski boat and it plays detailed, soft and load, and it puts out clean undistorted full range watts!

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M400/4 amp

Installed JL amp for my boat , sounds great and after 5 hours of playing music, the amp wasn`t hot. Will tell family and friends.

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