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JBL Synchros S400BT On-ear wireless Bluetooth® headphones

Item # 109S400BT

Rather than trying to be all things to all people, the JBL Synchros S400BT Bluetooth headphones aim to please one...

Rather than trying to be all things to all people, the JBL Synchros S400BT Bluetooth headphones aim to please one...

Item # 109S400BT

Shop all JBL Wireless Bluetooth Headphones

About the JBL Synchros S400BT

Jeff Miller

Big bass and wireless freedom

Rather than trying to be all things to all people, the JBL Synchros S400BT Bluetooth headphones aim to please one group: those who listen on the go and can't get enough bass. I know, I know — that sounds like a pretty specific type. But it describes a lot of us here at Crutchfield, and many of our customers. These headphones pair up wirelessly with compatible smartphones, and deliver an extra-strong dose of low-end response. You can get the deep, intense percussive undercurrent you might hear at a club, while you move through the day.

Big bass and wireless freedom

JBL Synchros S400BT Bluetooth headphones

The JBL Synchros S400BT wireless on-ear headphones fold up so you can take their bass-friendly sound anywhere.

Rather than trying to be all things to all people, the JBL Synchros S400BT Bluetooth headphones aim to please one group: those who listen on the go and can't get enough bass. I know, I know — that sounds like a pretty specific type. But it describes a lot of us here at Crutchfield, and many of our customers. These headphones pair up wirelessly with compatible smartphones, and deliver an extra-strong dose of low-end response. You can get the deep, intense percussive undercurrent you might hear at a club, while you move through the day.

Walk around with well-rounded sound

Just because these 'phones don't have a completely flat response, don't think the other frequencies are lacking. The Synchros S400BT boasts crisp highs and lively mids, underscored by the boosted bass. A rechargeable battery offers up to 15 hours of wireless use, but you shouldn't worry if it runs down. You can connect the included headphone cable and keep listening in wired mode.

Strong, flexible, and easy going

The Synchros S400BT 'phones sport a stainless steel headband that's durable and fits snugly, but still has some slack. The earcups swivel to relax the fit a bit more. They are softly padded and rest on your ears. When you're done listening, the headphones fold up into a portable bundle you can zip up inside the handy rubber case. 

Control music and calls by touch

Since your phone might be stuck in your pocket, JBL included touch sensor controls on the left earcup. You can skip tracks, play or pause music, and control the volume with just the swipe of a finger.

Got a call coming in? Simply tap the earcup — the built-in microphone lets you talk hands-free through the headphones.

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Product highlights:

  • closed-back, on-ear design helps block out external noise
  • 40mm drivers are tuned for rich, powerful bass response
  • Bluetooth 3.0 connectivity for wireless music listening and phone calls with compatible smartphones
    • aptX™ decoding provides high-quality music streaming from compatible devices
    • NFC-compatible for one-touch pairing with compatible devices
  • built-in rechargeable battery offers up to 15 hours of wireless use
  • PureBass technology delivers low-frequency response with detail and accuracy
  • earcup touch sensor controls let you answer calls, play/pause music, skip tracks, and control volume
    • LED light indicator and vibration feedback for touch controls
  • built-in microphone for clear calls with a smartphone
  • 3D-Axis folding design for easy storage
  • 49" detachable cable with miniplug connector for wired use
  • USB charging cable included
  • includes zippered, rubberized case
  • frequency response: 10-22,000 Hz
  • sensitivity: 115 dB
  • weight: 9.7 oz.
  • warranty: 1 year
  • MFR # S400BTBLK

What's in the box:

  • On-ear Bluetooth headphones (black)
  • 49" Audio cable (straight 2.5mm plug on one end and right angle 3.5mm plug on other end)
  • 42" USB cable (straight 2.5mm plug on one end and Type A USB on other end)
  • Clamshell-style zippered storage case
  • Quick Start Guide
  • Attention sheet
  • FCC and IC Statement booklet
  • Warranty booklet

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More details on the JBL Synchros S400BT

Mark G.

Features & specs

General
Fit Style On-ear
Earcup Type Closed
Earcup Width x Height 3.243" x 3.243"
Noise-canceling No
Bluetooth Yes
Bluetooth Version ---
Single-earbud Operation ---
Mic For Taking Calls Yes
Voice Assistant Access
Amazon Alexa No
Google Assistant No
Siri No
Connectors
3.5mm No
1/4" No
Lightning No
4.4mm balanced No
XLR4 balanced No
2.5mm No
Other None
Specs
Frequency Response 10-22k Hz
Sensitivity 115 dB
Impedance Not Given
Weight 9.7 ounces
Cord Length 49"
Parts Warranty 1 Year
Labor Warranty 1 Year

Product Research

Features

Overview: The JBL Synchros S400BT on-ear Bluetooth wireless headphones deliver comfort, great sound, and freedom without wires. The headphones offer JBL Professional Audio with PureBass performance, and echo-free phone calls without a wired connection to your smartphone. The S400BTs come with a USB charging cable, an audio cable (for use when the battery is exhausted), and a soft padded storage case.

Bluetooth 3.0: The Synchros S400BT has Bluetooth 3.0 wireless technology to give you a wireless listening experience. With aptX digital encoding, you can get virtually the same high-quality performance as with a wired Synchros headphone. In addition to aptX, the S400BT supports the following profiles: A2DP v1.2, AVRCP v1.4, HFP v1.6, and HSP v1.2.

NFC-Compatible: The S400BT offers easy wireless pairing with your compatible Android device through NFC (near-field communication) technology. By touching the right earcup with your NFC-enabled device, the headphones will automatically pair with the device.

Drivers: The Synchros S400BT features premium 40mm drivers that delivers powerful audio with clear highs and original JBL PureBass performance.

On-board Mic/Touch Controls: The Synchros S400BT has a touch-sensitive panel on the outside of the left earcup that allows you to control your music and manage your phone calls. By swiping the touch panel in an upward direction, the volume increases by one step. A downward swipe lowers the volume by a step. Swipe and hold actions continuously increase or decrease the volume, depending upon the direction. Music playback is controlled by front-to-back swipes (previous track) and swipe and hold actions (fast reverse). Next track and fast forward commands take a back-to-front swipe or swipe-and-hold action. A simple touch of the touch panel will play/pause the music or answer/end a phone call. A touch and hold action will reject an incoming call. In addition, a lighted ring around the left earcup touch panel will glow in the direction of the touch actions.

Rechargeable Battery: The JBL Synchros S400BT wireless headphones are powered by a 3.7V 610mAh Lithium polymer rechargeable battery. A fully charged battery gives you approximately 15 hours of music playback time or 20 hours of talk time. The battery is charged in approximately 2.5 hours via a USB connection, using the provided USB cable.

Audio Cable: When the battery is exhausted, you can still enjoy listening to your music via a wired connection. The headphones come with a 49" straight cable with a right-angled 3.5mm miniplug terminal. The cable has no in-line remote, so all music playback controls must be performed on your music source device.

Note: You cannot simultaneously charge the headphones while listening to music via a wired connection because the charging cable and audio cable use the same terminal on the headphones.

Storage Case: The padded clamshell-style zippered case stores and protects your headphones while not in use. An elastic pocket in the inner lid is for storing your spare cables and other accessories.

Specifications: The Synchros S400BT has the following specs:

  • Frequency Response: 10 Hz - 22kHz
  • Rated Power Input: 30 mW
  • Maximum SPL: 115 dB @ 30 mW
  • Connector: 3.5mm
  • Weight: 9.7 ounces

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