JBL Synchros E40BT

On-ear Bluetooth® headphones (Blue)

Item #: 109E40BTL

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JBL Synchros E40BT

Earcup buttons keep you in control of music and calls when you're listening wirelessly with the Synchros E40BT (shown in Red).

Bluetooth on a budget

You don't have to spend a lot of money to get headphones with Bluetooth wireless connectivity and good sound. The JBL Synchros E40BT delivers both at an impressively low price. They're cleverly styled, well built, and offer JBL's legendary sound, with PureBass technology ensuring your music has plenty of low-frequency power. Stow your smartphone in your pocket and listen wirelessly, using the the earcup controls to play and pause music, adjust the volume, or even take a hands-free call with the built-in microphone.

Wireless or wired listening

The Synchros E40BT run on a built-in rechargeable battery, which provides up to 16 hours of use. If your battery runs down, you won't be stuck without music. Simply connect the included headphone cable and keep listening in wired mode. Then, use your computer or a USB AC charger to get your headphones charged up for more wireless use.

Share a song wirelessly

One pair of E40BT headphones is cool. Two pairs can do something really cool. You can stream music to another pair of headphones wirelessly using JBL's ShareMe™ technology. This allows two people to listen to the same song from the same source at the same time. You can share music with any two pairs of ShareMe compatible headphones.

Product Highlights:

  • 40mm dynamic drivers
  • Bluetooth 3.0 and A2DP connectivity for wireless music listening and phone calls with compatible smartphones
  • earcup buttons offer music, volume, and call controls for compatible Bluetooth connected smartphones
  • built-in earcup microphone with echo-cancellation for clear, hands-free calls with a smartphone
  • PureBass technology delivers low-frequency response with detail and accuracy
  • ShareMe technology allows you to stream music wirelessly to a second pair of ShareMe compatible headphones
  • includes miniplug headphone cable for wired listening (disables Bluetooth functionality)
  • earcups swivel and fold flat for easy storage
  • built-in rechargeable battery provides up to 16 hours of music listening
  • USB charging cable included
  • frequency response: 20-22,000 Hz
  • impedance: 32 ohms
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research

What's in the box?

Download owner's manual

  • On-ear Bluetooth headphones (blue)
  • 50" Straight audio cable (straight 2.5mm plug on one end and a right angled 3.5mm plug on other end)
  • 40" Straight USB cable for charging (straight 2.5mm plug on one end and Type A USB plug on other end)
  • Quick Start Guide
  • Warranty sheet

Features and Specs

General
Fit Style On-ear
Earcup Type Closed
Noise-canceling No
Bluetooth Yes
Frequency Response 20-22k Hz
Sensitivity 114 dB
Impedance 32 Ohms
Weight 7.23 ounces
Cord Length 40"
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 E40BT Bluetooth headphones offer convenience and performance in one stylish and comfortable package. With ShareMe technology, you can even share your experience with another set of headphones. The E40BTs have a built-in Lithium-ion rechargeable battery that provides all day music playback capability. When the battery becomes exhausted, you can plug in the supplied auxiliary cable and continue listening.

Drivers: The Synchros E40BT over-the-ear headphones feature large 40mm drivers with PureBass performance in a lightweight closed design. The 32-ohm drivers give you crystal-clear stereo for enjoying your music or carrying on a phone conversation.

Bluetooth: The Synchros E40BT supports Bluetooth 3.0, with A2DP v1.3, AVRCP v1.5, HFP v1.6, and HSP v1.2. The left ear cup is equipped with a microphone featuring Konnexx echo-cancellation technology to give you a clean connection and clear, hands-free calling. The headphones are compatible with iPad (mini, 3rd and 4th gen), iPhone (5s, 5c, 5, and 4s), iPod touch, MacBook Air, MacBook Pro, Mac mini, Android 1.5 Cupcake to Android 4.4 KitKat, and Blackberry 1.0 to Blackberry 10 OS.

ShareMe: JBL's exclusive ShareMe technology lets you wirelessly and simultaneously share your music with another ShareMe-enabled headphone. When you are paired with a Bluetooth source device, you can then add a second pair of headphones and listen to the same source at the same time--a concert for two. ShareMe can be enabled using two E40BT headphones, a E40BT and an E50BT, or two E50BT headphones.

On-board Controls: The headphones' left ear cup includes a 4-way Multi-function Button (MFB) that lets you control your music playback and phone calls:

  • Press MFB up/down: Raises volume up or down
  • Press MFB forward:
    • Music: 1x play/pause; 2x next track; 3x previous track
    • Phone Calls: short press answer call; long press reject call; manage 2 calls at same time
  • Press and hold MFB forward: 1x fast forward; 2x fast reverse
  • Press MFB backward: ShareMe function

Battery: The built-in 3.7V Lithium-ion rechargeable battery (610 mAh) provides approximately 16 hours of music playback time, or 24 hours of phone talk time. The battery charges in approximately 3 hours via the included USB cable.

Specifications: The Synchros E40BT has the following specs:

  • Frequency Response: 20-22kHz
  • Maximum SPL: 114dB @ 30mW
  • Impedance: 32 ohms
  • BT Frequency Range: 2.402 - 2.480 GHz
  • Weight: 7.23 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.

JBL Synchros E40BT Reviews

Average Customer Review:

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Very Nice

Written By ALEXM, California on Sunday, December 14, 2014

Crutchfield Customer Review (What's this?)

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

My husband got these for me as an early xmas present. I do a lot of house cleaning (obviously) and I love how these are wireless and terrific sound. I love my JBL's over ear headphones.

Pros: Lightweight awesome sound quality comfortable affordable

Cons: Not much to say in this department

JBL's Bluetooth Headphones E40BT Review

Written By stupenndus, Connecticut on Saturday, December 13, 2014

Crutchfield Customer Review (What's this?)

  • rating
    "Coolness Factor"
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The audio industry has been slow to introduce Bluetooth headphones into the market place and I have waited patiently to find a product that is of sufficient quality and reliability at a reasonable price to announce "Bluetooth Headphones are now a serious contender". It is true that there were a few Bluetooth headphones at or below the $100 price point last year, but it was tough to sift through the good from the bad. Recently I spotted these headphones on the Crutchfield site and started to get excited that a reliable name brand manufacturer of budget, well balanced speakers, for at least the last three decades, have entered into the Bluetooth headphone market. I ordered a pair. They arrive in a nicely packaged box which reminds me of how Apple package their products. They come complete with two wire connectors - one which is for recharging (which is not intended for USB audio connection) and an optional way to directly connect between your audio device and the headphones in a conventional fashion. The build quality is very solid and gives the impression that they will last for a decent length of time. These headphones rotate about vertical access on each side so you can adjust the angle to better fit your hears. Connecting them up the computer or mobile phone was simple and reliable - as if years of fine tuning had been applied to the design. Sound quality was impressively balanced and very listenable for a detailed review of my favorite music. Get a pair

Pros: Easy to connect to a Bluetooth transmitting/receiving device and then reconnect later on. Microphone for ease of use with your mobile phone Easy to adjust volume control Ability to add a second set of Headphones for two people to share the same Bluetooth streaming device Well balanced frequency range with respectable clarity and depth (treble and bass)

Cons: Overall comfort when worn for longer than an hour or so - since these headphones sit on your ears they can begin to ache after a certain period of time. This is typical with any headphones of this type. I found that the headphones sounded better when reversed - so that the Left side was on the right ear. This may be due to my inbalance of frequency range between left and right ears. However reversing them means that the microphone is now facing the back of your head away from the mouth.

jbl synchros e40bt

Written By Angelo C., ft myets, Florida 33913 on Thursday, December 11, 2014

Crutchfield Customer Review (What's this?)

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

Awesome product. Sleek and comfortable.

Pros: Good sound and looks good.

Cons: It would have been nice to come with a carrying case.

JBL Synchros E40BT

Written By astash, Ohio on Sunday, December 07, 2014

Crutchfield Customer Review (What's this?)

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

very well built, a little on the heavy side, very easy to set up and user friendly.

Pros: well built, simple to use, easy operation, great battery life.

Cons: seem a little heavy, might just be me, not used to wearing full size headphones.

Great Headphones with Bluetooth bonus

Written By ChrisP, Katy, TX on Friday, November 14, 2014

Crutchfield Customer Review (What's this?)

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

These headphones have exceeded my expectations. For the money, these are great headphones and bluetooth on top of that. They are designed and built well to be sturdy and easy to manipulate, but also handle being stuffed in a bag while traveling. They are comfortable and may be adjusted in and out so as to fit the head better so that the cans sit properly on the ears. Additionally, while not "over the ear", the design and size of these is ideal where it rests on the ear while blocking out external sound like an over the ear. These also adjust easily to be worn comfortably over one ear at a time. I've been wearing them for practically 2 days straight with little/no discomfort. I love the simplicity of the display (one LED) and controls (up, down for volume/ one primary control for pause/play/skip). The design of the "bezel" around the controls provides for protection from inadvertently tapping the control while adjusting the phones on your head. I had them paired to my device and up and running in literally 2 minutes after opening the box. Finally and most importantly, the sound is really good- better than expected. I know there is better, but the bass is deep and clear, and clear highs. The mid could have a bit more depth. But I can't imagine others that cost 3X+ being that factor of quality in sound.

Pros: Solid construction while lightweight. Simple controls that actually work as designed. Great sound for a bluetooth device.

Cons: A bit tricky going from one paired source to another but that is most likely more of a source issue than the design of the headphones. Nothing else identified so far.

Technically good but not comfortable

Written By phung, Miami, FL on Tuesday, October 28, 2014

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

From a technical perspective, the sounds is good. Bluetooth sync was easy. Listening to music or talking on the phone sounds good

Pros: Hands free headset, talking on the phone via bluetooth

Cons: Not comfortable over the ears after a few minutes. The ear muffs cannot be adjusted, so they pinch your ears at the bottom.

JBL Synchros E40BT

Written By michael, Uvalde, TX on Sunday, September 28, 2014

Crutchfield Customer Review (What's this?)

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

Very nice blue tooth head set

Pros: Good quality

Cons: The ear pads are small, don't cover the entire ear.

Great headphones

Written By PeterW, Hockessin, DE on Thursday, September 18, 2014

Crutchfield Customer Review (What's this?)

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I have several hundred classical CDs on my laptop. I can listen to them anywhere but was always tethered to the device. With the JBLs I can go anywhere within about 30 ft of the computer and hear the same great sound. The headphones are comfortable, easy to connect by Bluetooth and, to my ears, are as good in sound quality as any of the higher priced headphones I have. I'm getting much more enjoyment our of my music collection. I did not test with a smartphone.

Pros: Comfortable, easy to connect, excellent sound with fine bass. As good at reducing surrounding noise as any of my non-noise canceling headphones.

Cons: About 30 ft range with my laptop - quite adequate for me.

JBL Synchros E40BT

Written By MICHELLE, CENTRE, AL on Friday, September 12, 2014

Crutchfield Customer Review (What's this?)

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

The price for these bluetooth headphones is the selling point. I purchased these for my 11 year old daughter and they are awesome. They are definitely worth the money compared to it's counterparts and you won't be paying an arm and a leg for these as you would be for those.

Pros: Price, quality of build, color choices

Cons: I would like a little more bass but they are loud enough for my daughter.

JBL Bluetooth Headphone

Written By DAVES, Virginia Beach, VA on Saturday, September 06, 2014

Crutchfield Customer Review (What's this?)

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

I like to use headsets especially when I'm going for a walk or working in the yard. I thought it would be nice not to have to fiddle with a cord especially when I'm trimming shrubs and the like around the house. Cords can easily get in the way and possibly cut by accident. I didn't expect the quality of the bluetooth sound to be as good as a corded set, but I was was very pleasantly surprised as how great these sounded. They also fit snug so they can be heard over lawnmower noise. I haven't tried using he phone setup yet. But, I'm very happy with the sound quality of music and audiobooks.

Pros: Great sound. Outside noise is muted because of snug fit.

Cons: They tend to fall off if you're bending over a lot picking things up while working in the yard.

Great Purchase !!

Written By Danny, 40065 on Sunday, August 31, 2014

Crutchfield Customer Review (What's this?)

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

I could not have asked for a better set of Bluetooth headphones . Sync with ease to everything I've tried as of yet . Great sound , and functions as they should .... Thanks yet again Crutchfield for another awesome purchase !!!

Pros: None

Cons: None

JBL Bluetooth Headphones

Written By Webb, Mequon, WI on Sunday, August 31, 2014

Crutchfield Customer Review (What's this?)

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

Great value when compared to Bose

Pros: Quality look and materials

Cons: No noise canceling

Questions & Answers Ask the community. Share your knowledge.

2 questions already asked

Blue headphone [ Jang  Dec 13, 2014 ]
The noise reduction is excellent I listencil to music at all levels and the sound is clear I also use it make phone calls and it works perfect no echo or distorted sounds. I love the quality I also brought my son one as a Birthday gift. [ Michael  Dec 10, 2014 ]
The external noise reduction is not great. However, the sound quality is phenomenal if you pump enough volume into them.. [ valdo  Dec 08, 2014 ]
The external noise reduction is not great. However, the sound quality is phenomenal if you pump enough volume into them.. [ valdo  Dec 08, 2014 ]
Noise reduction is the same for any on ear headphone, minimally passive. I purchased these for my wife but I have used them. The sound quality is fantastic but probably not your best choice for a trip on an airplane. They almost seem more comfortable than my over the ear JBL E50BT's. I have a good sized head and they fit great. You might get more of a passive noise cancelling from the E50BT. Hope this helped. [ JASON J  Dec 08, 2014 ]
This headphone is light. Noise reduction is ok. It's not noise canceling. Very easy to set up with Bluetooth devices. Battery lasts very long before recharging. I also have the e50bt. That's bigger and excellent noise reduction. [ Al  Dec 07, 2014 ]
I've had no issues with noise reduction . As far as sizing , they fit my head just fine ( and I have a pretty large head ) . The only issue I have , which is minor , is with comfort after wearing these awhile ..... The ear pads hold heat , therefore creating sweat . Other that this , I'd highly recommend . Good luck with your purchase . [ DANIEL  Dec 07, 2014 ]
The noise reduction on the JBL E40BT was OK and the music level was just fine, I have a big head and didn't feel any discomfort at all while using these for walking/jogging and at the gym. I did however had pairing problem with these, it seem that every day that I was going to use them it lost bluetooth connection with my iPhone or Macbook. Got tired of that and that's why I opted out for a pair of Bose SoundLink Bluetooth, I love the sound and noise reduction on these much better and the paring problem disappeared [ LUIS  Dec 07, 2014 ]
They are Christmas gifts that I haven't given yet to my kids. I'll let you know as soon as they open it. I'm planning to give it to them next week. [ RAJA  Dec 07, 2014 ]
I have been enjoying these headphones for a couple of months. They are not actively noise reducing but the foam earpieces fit comfortably and block out normal household background noise. I have a hat size of 7? inches and these are just fine. For the money I think they would be hard to beat. [ PETER  Dec 07, 2014 ]
I think the sound is perfect. I also have a big head but haven't had any difficulty in wearing the earphones for one or two hours. All in all 100% satisfied with this purchase. [ warren  Dec 07, 2014 ]
No noise reduction it all. Not the most comfortable fitting. My ears got a little sore after wearing them for a while. Okay for the price. [ Richard  Dec 07, 2014 ]
First, these headphones sound just great both as Bluetooth and wired. I read the Same reviews where someone stretched the set by placing them over the back of a couch overnight. That works if you find them to be too tight. These aren't noise canceling sets like Bose of that type, but they do block noise effectively. You can listen to these while mowing your lawn without having to turn them up dangerously high. They stay on pretty well unless you're trying to go jogging or something. I got them for the convenience of Bluetooth and was surprised at how great they sound. These are a very goof deal. [ David  Dec 07, 2014 ]
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question. [ Krissy  Aug 18, 2014 ]  Staff