• 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
  • 2016-10-26T10:19CST
  • bvseo_cps, prod_bvrr, vn_cps_3.4.0
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_42
  • loc_en_US, sid_synchross400bt, PRD, sort_positive
  • clientName_JBL

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: 2016-10-25

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
  • 2016-10-26T10:34CST
  • bvseo_cps, prod_bvqa, vn_cps_3.4.0
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_34
  • loc_en_US, sid_synchross400bt, PRD, sort_recentAnswersFirst
  • clientName_JBL

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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