• Award Winner

Synchros S400BT


Premium On-ear Bluetooth® Stereo Headphone

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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# S400BTBLK

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
For a complete list for all specs for this product click below
  • 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

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

Synchros S400BT is rated 4.619047619047619 out of 5 by 42.
Rated 5 out of 5 by from Best headphones I've ever owned Got these with my new phone. Excellent quality. Pretty comfortable, except after a few hours of use, but its usually not a big deal.
Date published: 2016-10-13
Rated 5 out of 5 by from Affordable price and high quality Sound great, bass is great plus very good price I hope JBL will come up with more design bluetooth Headphone 
Date published: 2016-09-26
Rated 5 out of 5 by from great sound Bought these after my other jbl bt headphones left speaker went out but my old pair showed a battery level on my iphone 6 how come i dont get the battery level on this pair???
Date published: 2016-05-22
Rated 5 out of 5 by from Great quality I love this product. The build quality and the sound quality are amazing. The battery life is another great feature that I love about this product.
Date published: 2016-05-07
Rated 5 out of 5 by from great head phones I bought these head phones about three months ago and love these to death ..
Date published: 2016-03-22
Rated 5 out of 5 by from Jbl greatness. These.are realy nice....the.earpads are soft and comphy.the sound is awsume.im spoiled rotten.
Date published: 2016-03-13
Rated 5 out of 5 by from Excxellent These were not an IMPULSIVE buy. I shopped, and concluded that ALL THINGS considered, from price, features, technical specs, these were simply the BEST. Tested a comparable in both the Beats, and Bose Brands, and these won out hands down. Not even close. And beyond the sound quality, and style was the value. Both Beats, and Bose were FAR more expensive. Guess they have to pay for all that advertisement some how. Comparatively to the other brands the one stand out feature beyond just overall better sound was the Low's (Bass) sound where these far out perform the others. The other two sound as if they were EQ'd with the bass turned all the way down, an the treble up. I just ordered the exact same ones for my 15 year old grandson. I tried mine, and loved them.
Date published: 2016-01-10
Rated 5 out of 5 by from Great functionality! I bought this on Black Friday for a bargain. The touch screen is such a cool feature. I don't have to touch my phone at all to listen to my favorite music, but just need to press one button and the touch pad, both on the left ear. I sometimes plug into my computer at work which is a great option if I'm in my office for an extended amount of time. If I go for a walk, it's as simple as unplug, press two buttons and I'm listening to my favorite music in seconds. Also, very portable and comfortable with great sound quality.
Date published: 2016-01-05
  • 2016-10-25T08:35CST
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I use these for working out and as such they tend to get sweaty and I would like to remove the ear cups and clean them but I don't want to risk breaking anything in the process. What are the instructions for properly removing the ear cups on these?

Asked by: DannyGA
• The earpads attach to the headphone's earcups using a "flange" on the back of the earpad. They attach to the earcup by inserting the flange into a slot on the earcup. 1. Carefully remove the old earpdad taking note of how it was attached. 2. While holding the earcup with one hand, carefully begin inserting the earpad flange into the earcup's slot by stretching the earpad. Although the earpad material is quite flexible, use care not to overstretch it. 3. It is best to start from the inside top of the earcup and work around to the outside bottom. 4. Guide the flange into the slot using a finger on the inside of the earpad while holding the earcup with the other hand. 5. Once the earpd is seated on the earcup, check to make certain the flange is completely inserted into the earcup slot.
Answered by: Jaycob at CustomerService
Date published: 2016-09-29

I am having trouble pairing the headphones with other devices..any advice?

Asked by: Bobby13
A white LED light indicator means the headphone is ON. To have this connected on your phone 1.Press and hold the POWER ON button for 0.5 seconds. The LED light indicator should blink fast if it’s blinking slowly, You need to press and hold the POWER ON button again till it starts blinking fast. 2.Once LED light is blinking fast you are ready to pair to your mobile phone. 3.From any Home screen, tap Apps. 1. Tap Settings. 2. Scroll to 'NETWORK CONNECTIONS,' then tap Bluetooth. 3. Slide the Bluetooth Switch right to the ON position. 4. The Bluetooth Switch moves right and turns green. 5. If necessary, turn on the other device and make it discoverable. 6. Under 'AVAILABLE DEVICES,' tap the device to pair. 7. Tap Scan if you do not see the device.
Answered by: Jaycob at CustomerService
Date published: 2016-09-07

Is the charging cable for the s400BT the same specs as the charging cable for the e40BT?

Asked by: Brett
Yes. Any USB to 2.5mm Aux cable can be used to charge the headphones.
Answered by: Joe G at Customer Service
Date published: 2016-09-02

Where would the serial number be for these headphones?

Asked by: Tyrek
The serial number should be under the earpads of the headphone. Try and remove the earpads on the headphone and you should see a small white sticker indicating the serial number.
Answered by: Amir at Customer Service
Date published: 2016-08-20

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: 2016-07-24

Where do I go to get the driver fo S400BT

Asked by: Jim Todd
The Dynamic Driver is the most common driver that is featured in all JBL headphones. Please contact your local JBL Customer Support for information regarding replacement parts and availability.
Answered by: Karissa
Date published: 2016-07-24

Does it have a built in microphone? I want to use it primarely at the gym, but I intend on answering phone calls and use in on skype on my computer.

Asked by: Atila
Yes, the SYNCHROS S400BT has a built-in microphone which you can use for phone calls and Skype.
Answered by: Joe G at Customer Service
Date published: 2016-07-14

how long does it take to charge the wireless synchros bluetooth s400bt headphones

Asked by: cannon
The S400BT takes 2-3 hours before it reaches full charge. There is an Light Emitting Diode in the ring around the charging plug. This LED lights up in red when charging takes place. When charging is complete, the LED changes to white color.
Answered by: Joe G at Customer Service
Date published: 2016-07-01
  • 2016-10-25T09:00CST
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Closeout\n \n\n JBL\n \n Synchros S400BT Wireless On-Ear Bluetooth Stereo Headphones, 20 Hz-20 kHz Frequency Response, Black
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