JBL Synchros S100a

In-ear headphones with in-line remote and microphone (Black)

Item #: 109SYN100B

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5 Reviews

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Fit for almost any smartphone

Smartphones are pretty powerful music players. But those earbuds they throw in when you buy one leave a lot to be desired. The JBL Synchros S100a headphones are a smart upgrade for just about any smartphone. They feature an in-line remote control with a built-in microphone that's compatible with the iPhone® as well as Android™ and Windows® devices. So even if you change smartphones, you won't have to buy new headphones.

Proper sound from the proper fit

Naturally, you'll get more detailed sound from the Synchros headphones than those stock earbuds can offer. Plus, JBL's PureBass technology ensures you aren't left wondering what happened to all the low frequencies. Want to improve the sound quality of these headphones? Make sure they fit properly in your ear by experimenting with the included assortment of silicone and foam ear tips. A proper fit ensures a tight seal, which means more detail, better bass response, and less external noise getting through.

Product Highlights:

  • die-cast aluminum housings provide durability in a lightweight design
  • 9mm driver in each earpiece
  • in-line remote offers play/pause and call answer functionality for most smartphones, including Apple, Android, and Windows devices
  • volume control for calls and music (Samsung, Nokia Lumia, and Sony Xperia smartphones)
  • built-in microphone for taking calls on a smartphone
  • PureBass technology delivers deep low-frequency response with detail and accuracy
  • tangle-resistant flat cable with 3.5mm miniplug
  • 3 pairs of silicone and 3 pairs of foam ear tips to ensure a comfortable fit and proper noise isolation
  • carrying case
  • frequency response: 10-22,000 Hz
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research

What's in the box?

Download owner's manual

  • In-ear headphones (black) with attached 4' cord and in-line mic/remote (3.5mm miniplug)
  • Clothing clip (installed on cable)
  • 3 Pairs of rubber eartips (small / medium (installed) / large)
  • 1 Pair of Comply memory foam eartips
  • Zippered semi-hard case
  • Quick Start Guide
  • Warranty booklet
  • Attention! booklet
  • Indication of Toxic and Hazardous Substances/Elements

Features and Specs

Fit Style In-ear/Earbud
Earcup Type Closed
Noise-canceling No
Bluetooth No
Frequency Response 10-22k Hz
Sensitivity Not Given
Impedance Not Given
Weight 0.7 ounces
Cord Length 48"
Airline Adapter Included No
iPod Control Yes
Volume Control Yes
Built-in Microphone Yes
Parts Warranty 1 Year
Labor Warranty 1 Year

Product Research


Overview: The JBL Synchros S100a in-ear headphones are designed for comfort, convenience, and durability. The Synchros S100a features ultra-light die-cast aluminum construction, angled ear tips, and a tangle-resistant flat cable with a 3-button remote and microphone, optimized for Android devices. The Synchros S100a headphones come with a soft semi-hard storage case.

Drivers: The Synchros S100a features advanced 9mm drivers that delivers powerful audio with clear highs and original JBL PureBass performance.

In-line Mic/Remotes: The Synchros S100a has a 48" flat cable with a 3.5mm miniplug terminal and a 3-button in-line remote/microphone. The outer buttons control the volume up and down, while the center button controls music playback, and to answer/hang up a phone call. The controls and microphone are compatible with the following devices:

  • Playback Control, Volume Control, and Microphone: Samsung, Sony Xperia, and Nokia Lumia
  • Playback Control and Microphone Only: iPod touch (2nd gen and later), iPhone (3GS or later), iPad, Samsung, Sony Xperia, and Nokia Lumia, HTC, LG, Blackberry, Google, Android, and Windows devices.
  • Playback Control Only: iPod nano (4th gen and later), iPod classic (120 GB, 160 GB), iPod shuffle (3rd gen and later)

Storage Case: The semi-hard zippered storage case lets you store your headphones for easy transport. An elastic pocket in the inner lid is for storing your ear tip assortment. The case is 2-3/4" in diameter and 1-1/4" high.

Specifications: The Synchros S100a has the following specs:

  • Frequency Response: 10-22kHz
  • Rated Power Input: 5 mW
  • Maximum SPL: 106 dB @ 30 mW
  • Connector: 3.5mm
  • Weight: 0.7 ounces

Our Product Research Team

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JBL Synchros S100a Reviews

Average Customer Review:

5 reviews
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JBL Synchros S100a

Written By JBL Synchros S100a, Bronx, NY on Thursday, December 11, 2014

Crutchfield Customer Review (What's this?)

  • rating
    "Coolness Factor"
  • rating
    Build Quality
  • rating
  • rating
    Noise Reduction
  • rating
    Sound Quality

I'm an audiophile kind of listener. I will turn off a system if I don't appreciate the sound quality. I was expecting something with more clarity, bass, and precision for ear plugs that go for close to $80.00. I wonder if a cheap set at a discount retailer might sound similar or even better? I'm a bit disappointed. I've used Bose ear phones in the past and recognize the different in quality, clarity, and close to life-like. I can't recommend this set to anyone right now.

Pros: They work?

Cons: Not enough volume or depth without pumping up the level drastically, a bit uncomfortable (they feel as if they're about to fall out at any moment), the treble and mid-range is almost missing, and the bass? I'm not overly happy with this product.

keeping up with joan sis

Written By 6619041658, 6619041658 on Thursday, November 27, 2014

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

People just buy the Beat earphone for the name and that's what they are paying for is the name this JBL are awesome

JBL Synchros S100a

Written By Dale V, IL on Tuesday, June 10, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

As good as Beats and cost less.

Pros: Good sound quality and comfort

Cons: Do not want to stay in ear during active situations.


Written By Jonnyyy, Phoenix, or on Sunday, March 30, 2014

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Really great pair of headphones. Definitely worth the price

JBL Synchros S100a

Written By Anonymous, New Bern on Wednesday, February 12, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Comfort
  • Noise Reduction
  • Sound Quality

Better Then Beats

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die-cast aluminum housings with metal accents