Synchros S400BT Refurbished


Premium On-ear Bluetooth® Stereo Headphone

$159.99159.99 each $299.95 Save $140

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Bluetooth® 3.0 freedom – with a touch of revolution.

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 Synchro 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.

Item# S400BTWHT-Z

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)

English 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.

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1 Year

Note: the Warranty Card provided with your JBL product contains the full terms and conditions of your warranty.

Unless a different warranty period is stated in the Warranty Card provided with your JBL product, JBL warrants for a period of 1 year (5 years for any non-powered speakers) from the date of retail purchase by the original end-use purchaser, that this product, when delivered to you in new condition, in original packaging, from a JBL authorized reseller and used in normal conditions, is free from any defects in manufacturing, materials and workmanship. Refer to the Warranty Card provided with your JBL product for specific details including what is not covered along with other terms and conditions.

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Synchros S400BT is rated 4.5 out of 5 by 64.
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
Rated 5 out of 5 by from Great choice over Beats/similar competition I got these to wear at the gym. I didn't want to spend $300+ on Bose, or however much the comparable Beats were. Got these for $79 on black friday, didn't realize how much of an awesome deal that was. The bass response is insane--sounds so good. Overall sound quality is perfect. I'm somewhat of an audiophile, and bought these simply to drown out noise at the gym, but did not expect them to blow me away like this. For $79, they are an absolute steal. Even for $229, I would definitely consider them over the competition.
Date published: 2016-12-13
Rated 5 out of 5 by from Nice headphone My son love it, I always love JBL sound. Not bad for the price
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: 2018-03-14

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

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

Can these be used for d.j.ing ,?

Asked by: Choice
Yes, the S400s will work via the wired connection. These are an on-ear design so if you are doing a louder set, the S500s might be another pair to look at. They are over the ear and may block out some of the ambient noise.
Answered by: ChrisS
Date published: 2017-12-02
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