JBL Synchros S300a

On-ear headphones with in-line remote and microphone (Black/Red)

Item #: 109SYN30BR

Low Stock

Be the first to write a review | Ask Questions

Your price: $149.99 Earn up to 150 Rewards points

Add to Cart Free Shipping Lifetime Tech Support

+ Add to wishlist + Email me alerts for this product

View all associated offers

Wake up your music

Need to get a little more life out of your favorite songs? Then plug the JBL Synchros S300a headphones into your smartphone or music player. Pop these smartly styled cans on your ears and even the same old songs will sound new and fresh. JBL knows more than a few things about sound, applying many years' experience in live sound and speakers to these cool-looking headphones. High-end clarity is paired with JBL's PureBass technology for rich low-frequency response.

Universal remote and microphone

The Synchros S300a headphones are a perfect match for a wide variety of smartphones. There's an in-line remote control with a built-in microphone that's compatible with the iPhone® as well as Android™ and Windows® devices. Play and pause tunes, answer calls, and even control volume with select phones.

Nice looks, built to last

At first glance, the Synchros S300a may look like around-the-ear headphones. But they actually rest against your ears. Those large leather ear cushions provide plenty of comfort to keep you listening. The headband is stainless steel, adding durability to these headphones' list of attributes.

Product Highlights:

  • 40mm dynamic drivers
  • stainless steel headband and leather ear cushions
  • 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
  • detachable cable with a 3.5 miniplug
  • folding design for easy storage
  • 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

  • On-ear headphones (black/red)
  • 4' Headphone cable with in-line mic/remote
  • Clothing clip (installed on cable)
  • Zippered storage case
  • Quick Start Guide
  • Warranty booklet
  • Attention! booklet
  • Indication of Toxic and Hazardous Substances/Elements

Features and Specs

General
Fit Style On-ear
Earcup Type Closed
Noise-canceling No
Bluetooth No
Frequency Response 10-22k Hz
Sensitivity Not Given
Impedance Not Given
Weight 7.7 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

Features

Overview: The JBL Synchros S300a on-ear headphones are designed for comfort, convenience, and durability. The Synchros S300a features a padded stainless steel headband with collapsible soft leather-covered earcups for easy storage in the zippered case. The detachable 4' cable has a 3-button remote and microphone, optimized for Android devices.

Drivers: The Synchros S300a features advanced 40mm drivers that delivers powerful audio with clear highs and deep, powerful bass, just like JBL's professional audio speakers.

In-line Mic/Remotes: The Synchros S300a has a detachable 4' 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 zippered storage case lets you store your headphones for easy transport. An elastic pocket in the inner lid is for storing your cable and other accessories. The case is 7-1/2" x 2-3/8" x 6".

Specifications: The Synchros S300a has the following specs:

  • Frequency Response: 10-22kHz
  • Rated Power Input: 30 mW
  • Maximum SPL: 115 dB @ 30 mW
  • Connector: 3.5mm
  • Weight: 7.7 ounces

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Be the first to review this product
Great Gear Giveaway

Submit a review and then enter to win a $500 rewards card

Review this product:

Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information.

Your email won't be visible. Please use the email address that is associated with your order.
(e.g., JohnD) Your review will be signed using the display name and location
(e.g., Charlottesville, VA)

Click on a star to rate the overall product on a scale of 1-5
Rate the following specific attributes
  Sound Quality
 "Coolness Factor"
 Build Quality
 Comfort
 Noise Reduction
1500 characters left
  Attach a YouTube Review
Crutchfield Video Review Guidelines
  • Only submit videos that you made or are authorized to use.
  • Do not submit videos that contain music, video or visuals that are copyrighted and belong to someone else.
  • Please see our Review Guidelines for more information.
500 characters left
500 characters left

Get everything you’ll need to enjoy your new JBL Synchros S300a

Get better sound from your headphones with a dedicated headphone amp.
Improve the sound from your digital audio sources.
Pro-Ject Head Box S

Pro-Ject Head Box S

Headphone amplifier (Black)

Item #: 252HDBXSB

(11)

$159.99
Add to Cart
HiFiMAN EF5

HiFiMAN EF5

Vacuum tube headphone amplifier

Item #: 818EF5

(1)

$499.99
Add to Cart
HiFiMAN EF-6

HiFiMAN EF-6

Headphone amplifier

Item #: 818EF6

$1,599.99
Add to Cart
Audioengine D3

Audioengine D3

Plug-in USB digital-to-analog converter/headphone amplifier

Item #: 772D3DAC

(3)

$149.99
After $40.00 Price Break Add to Cart
Audioengine D1

Audioengine D1

Digital-to-analog converter/headphone amplifier

Item #: 772D1

(62)

$169.99
Add to Cart
Arcam rPac

Arcam rPac

USB digital-to-analog converter/headphone amplifier

Item #: 776RPAC

(3)

$249.99
Add to Cart
Cambridge Audio DacMagic Plus

Cambridge Audio DacMagic Plus

Stereo digital-to-analog converter/headphone amp/preamp (Black)

Item #: 779DACMPLB

(16)

$499.99
After $100.00 Price Break Add to Cart

Questions & Answers Ask the community. Share your knowledge.

Looking for more? Check out the next model in this lineup.

JBL Synchros 500

JBL Synchros S500

In Stock

$279.99

Add to Cart

Get better sound and more noise isolation

The JBL Synchros S500 offers these features:

LiveStage™ digital signal processing for a more forward soundstage similar to speaker listening

closed-back, around-the-ear design helps block external noise

2 detachable cables with remote and microphone for Apple® and Android™ devices