Synchros S400BT


Premium On-ear Bluetooth® Stereo Headphone

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The S400BT: a new experience in sound and simplicity

The portable revolution will be synchronized. You can’t press pause on a pro-audio revolution – certainly not when JBL engineers are at the helm. Introducing the new JBL S400BT. As the latest addition to the JBL Synchros line of premium headphones, the award-winning S400BT adds the freedom of Bluetooth 3.0 wireless to the performance of a Synchros headphone. Using advanced aptX digital encoding technology that streams high-resolution audio on par with any wired Synchros headphone, the S400BT is fine-tuned on the inside to maximize enjoyment on the outside. Take the headphone’s hassle-free single touch sensor for instance: all you need to do is swipe your finger anywhere along the S400BT’s left outer earcup, and you can seamlessly adjust your headphone’s volume, track-changes, and call settings, since the entire earcup functions as a single, touch-sensitive control system. The right outer earcup boosts user flexibility as well, coming with an NFC sensor that pairs your headphone to any NFC-enabled device. Just give the right earcup a single tap, and you’re instantly connected. With this level of intuitive technology at play, it’s hard not to notice how the S400BT simplifies like never before. Others will definitely take notice: a built-in LED lighting system trails the touch of your hand in reaction to each adjustment made to your headphone’s settings. Now you can showcase your listening experience at the speed of light. Viewed as a whole, the S400BT is a wireless headphone that’s meant to celebrate - as much as to simplify – premium listening. Chances are you’ve never witnessed a headphone that comes even close to this.


Device Compatibility

Bluetooth Yes

General Specifications

Rated Power Input 30mW

Audio Specifications

Frequency Response 10Hz – 22kHz
Maximum SPL 115dB @ 30mW

Speaker Specifications

Driver Premium 40mm drivers


Weight (g) 275
Height (in) 7-1/2
Height (mm) 190
Width (in) 5-3/4
Width (mm) 146
Depth (in) 3
Depth (mm) 77
Click here for a complete list of all specs for this product

Spec Sheet (EN)

576 KB
  • Quick-start guide
  • 1 3.5 mm audio cable�
  • 1 USB charging cable
  • 1 pair JBL S400BT wireless on-ear Bluetooth® stereo headphone
  • Carry Case

Manuals & Downloads

The latest owner's manuals, quick start guides, and documents.

Search Result For ""

Synchros S400BT is rated 4.4 out of 5 by 68.
Rated 5 out of 5 by from Amazing!!! I’ve had these headphones for 3 years, and they are still some of the best headphones I’ve ever had. They work perfectly, and it’s not that much of a surprise since they’re from JBL (my dad’s been using their equipment for 30+ years) However, I lost the charging cable, and I can’t find any replacement cables that aren’t from a sketchy third-party company on eBay. I’d really like to get a genuine one or at least one from a trusted company, because it seems like these aren’t gonna break anytime soon.
Date published: 2018-07-13
Rated 5 out of 5 by from 2 Years Running I've had these headphones for 2+ years and I cannot find a suitable replacement with the same or greater specs. The only big issues I had were the random touch controls calling my last caller or start/stopping the music when I brushed the sweat off my brow. But they've otherwise been the best set of BT headphones I've ever owned. Had one of the joints snap finally after 2 years but they still work just fine (duct tape).
Date published: 2018-06-28
Rated 5 out of 5 by from Worth every penny! Good pair of headphones for the price I paid ($75). On par with premiun headphones like Bose
Date published: 2016-12-16
Rated 5 out of 5 by from S400BT I've had these for about a month and use them every day. The sound quality is absolutely first rate! Also, they fold up into a very compact package for travel. Great product overall.
Date published: 2016-12-14
Rated 5 out of 5 by from Wow Headphones I love this headphones ! This is my first purchase with JBL. Powerful Bass and beautifully build. Only con. is It doesn't show battery status. Neither in smart phone nor in decive.
Date published: 2016-12-13
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Is there a smartphone APPlication I can use to see battery charge level?

Asked by: Raedwulf
Unfortunately, there's no available app for the SYNCHROS S400BT. However, when the SYNCHROS S400BT is paired to the iOS device, a small battery symbol will appear, usually next to the Bluetooth symbol. This is a battery level indicator.
Answered by: Joe G at Customer Service
Date published: 2018-09-18

what is the difference between the s400bt and the s400bt+

Asked by: cozumel
I'm also wondering what the difference is between the s400bt/s400bt+..........? I'm having a hard time overstanding how " Joe " doesn't know what model or what is meant by the "+" signification when the plus sign is clearly being used in the opening paragraph of this page as a descriptor of said product? Is it perhaps typo or a figment of the imagination? Clarity as to why "+" is being used by the company would truly answer our question.
Answered by: Jabarllo
Date published: 2018-02-10

I have trouble pairing my Synchros S400BT and Macbook Pro using Mac OS X 10.6.8. The computer does not even find the headphone. What is its device address? Can you help?

Asked by: EEEE
Bluetooth compatibility should be checked before connecting any Bluetooth capable device to one another, i.e recent/newer model mobile devices came out with Bluetooth version 4.1 which is compatible with these Bluetooth Profiles: A2DP V1.3, AVRCP V1.4, HFP V1.6, HSP V1.2. Some laptops(Mac/Windows based) comes with Bluetooth version 4.1 which also has the aforementioned Bluetooth Profiles. Some older versions of laptops only has the Bluetooth version 3.0 and below, which is not a problem with Bluetooth version 4.1 in terms of connectivity as Bluetooth version 4.1 is said to be backwards compatible, so connecting a device with a higher version of Bluetooth to another device with a lower version of Bluetooth is possible. The concern now is if the laptop's Bluetooth version is capable of Bluetooth audio streaming using the latest Bluetooth Streaming Profiles( A2DP V1.3, AVRCP V1.4, HFP V1.6, HSP V1.2 ). If the computer is not capable of streaming audio wirelessly via Bluetooth, you would need to update the Bluetooth version of your laptop. Firmware(drivers) and Software updates are available from the manufacturer of the laptop/computer.
Answered by: Amir at Customer Service
Date published: 2017-12-02

I got this pair of headphones for Christmas. I'm not sure if it just my pair or not but when I'm working out they cut out every once in awhile. They sound like they crackle and do not hold a steady connection

Asked by: Tanner
There are a couple of things to be considered here. 1. If you are using the wired connection, make sure the cable is securely connected on both ends. A loose cable can cause a crackle like sound. 2. If you are using them via Bluetooth, try moving your device to the other side of your body. Bluetooth radio signals do not go through your body very well.
Answered by: ChrisS
Date published: 2017-12-02

Will they work on Windows 10? & I’m a bit afraid of what’s getting sold here due to the fact that JBL it self has the Refurbished product on sale.

Asked by: Aria
Hi! The JBL Synchros S400BT utilizes the standard Bluetooth Stereo Audio drivers available in most computers. There are two different Bluetooth protocols, one for Headset Audio used for talking on the phone, and the other for high quality stereo audio listening. Your laptop should be able to connect to the headphones using the Stereo Audio protocol. Your best bet is to go into your control panel and find the Bluetooth setup. This setup usually provides a setup wizard and will take you through the steps to install the drivers needed for Stereo Audio. Also, we do have refurbished products being sold, but these products are tested and works as a brand new product which are approved by our engineers.
Answered by: Nick F
Date published: 2018-05-28

What is the proper way to charge these?

Asked by: Jb8301
The Synchros S400BT comes with a micro USB cable that you can plug into your laptop or computer. The 2.5 mm jack end will need to be plugged in on the right ear phone that is located between the power and the bluetooth button.
Answered by: Karissa
Date published: 2017-12-02

There is a CTIA cable to use with the S400BT, for, when wired, maintain the audio control and microfone (by the cable) functionality?

Asked by: Rafael Fischer
The S400BT only comes with a straight cable that does not have an inline remote and this disables the controls on the S400BT.
Answered by: Ren at Customer Service
Date published: 2017-12-02

Where do I find a charger to these? Lost mines

Asked by: DNelson1020
The part you're looking for is EW-MF10000600-B. Please submit a request at www.jbl.com/contactus and give them that part number. They will be able to assist you.
Answered by: Joe G at Customer Service
Date published: 2017-12-02
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