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Reviewed on Oct 31, 2016

JBL Synchros E50BT Wireless HEADPHONES REVIEW

Type : Over-ear
Enclosure : Closed-Back
Wireless : Yes
Noise-Cancelling : No
Mic : Yes
Transducer : Dynamic

The JBL E50BT are stylish, wireless headphones with a decent sound and a sturdy, durable build. They have a well-crafted design but oddly shaped ear cups that don't fit properly around the ears. Unfortunately, this creates a poor seal that lets noise seep into your audio and also leaks quite a bit.

Test Results
Design 6.1
Sound 7.2
Isolation 5.3
Microphone 6.3
Active Features 5.9
Connectivity 5.6
Pros
  • Above-average audio reproduction.
  • Sturdy and durable build.
  • Great wireless range.
Cons
  • Poor noise isolation.
  • Leaky at moderate-to-high volumes.
  • Awkward ear cup fit can be uncomfortable.
  • Bass delivery varies significantly across users. Sensitive to glasses.
  1. Update 2/16/2018: Converted to Test Bench 1.2.
  2. Update 9/28/2017: The microphone has been tested with our new methodology, as explained here
  3. Update 8/10/2017: Converted to Test Bench 1.1. Learn more about our new versioned test bench system here.

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Summary

  • 6.3 Mixed Usage
  • 7.0 Critical Listening
  • 6.2 Commute/Travel
  • 6.6 Sports/Fitness
  • 6.2 Office
  • 5.4 TV
  • 5.1 Gaming
Mixed Usage 6.3

The JBL E50BT are versatile headphones for everyday casual use. They have an above-average and decently balanced sound. They're also robustly built and seem durable. Unfortunately, the awkward fit of the ear cups poorly isolate listeners from ambient noise and they also leak a lot.

Critical Listening 7.0

Above-average for critical listening. These headphones have a good bass, a decent midrange and a moderately spacious soundstage for a closed-back model. They sound punchy and have a satisfactory amount of detail with instruments and vocals. However, they lack a little warmth and are a bit uneven for pure critical listening.

Commute/Travel 6.2

Subpar for commuting. The odd fit of the ear cups lets a lot of ambient noise seep into your audio which won't be ideal for loud, noisy environments.

Sports/Fitness 6.6

Decent for sports use. The JBL Synchros E50BT have a great control scheme, a moderately stable fit, and a good wireless range that covers a large area, especially outdoors in direct line of sight. Unfortunately, they're a bit too bulky, to comfortably exercise with.

Office 6.2

Mediocre for office use. If you can get a good seal, these headphones won't leak too much. However, they poorly isolate you from ambient noise and won't be the best headphones to use in a lively or noisy office.

Test Results

Style

The JBL Synchros E50BT have a good design that gives them a more premium appeal than their price point would suggest. They have circular and flat ear cups that do not protrude outwards once on your head. The headband and frame are wide and look sturdy. They come in a variety of color schemes to suit your tastes. They won't be the ideal looking headphones for everyone, and the hinge mechanism looks a little awkward.

5.5 Comfort
Weight : 0.64 lbs
Clamping Force
:
0.92 lbs

The JBl E50 have oddly sized ear cups that don't quite encompass the ears. Therefore the fit is somewhere between an over ear and an on-ear design, which unfortunately means they won't be the most comfortable for listeners with larger ears. They're not too tight but the rigid padding and the awkward fit exerts pressure on the tip of your ears, which gets uncomfortable during long listening sessions.

6.2 Controls
Ease of use : Decent
Feedback : Mediocre
Call/Music Control : Yes
Volume Control : Yes
Microphone Control : No
Channel Mixing
:
N/A
Noise Canceling Control : No
Talk-Through
:
N/A
Additional Buttons : No

These headphones offer good button placement and functionality. They provide call/music, track skipping, and volume controls, which can all be found on the left ear cup including the power/Bluetooth sync button. The controls do not feel cramped and are well laid out. However, the buttons are flat with no tactile indicators.

6.5 Stability

The JBL E50 are moderately stable. They're sufficiently tight on the head and won't move much during casual listening sessions. However, similarly to the Audio Technica ATH-M50x, they're not sports headphones. They're bulky and will quickly fall when used while running or jogging. On the upside, the wireless design makes them less likely to be yanked off your head due to the audio cable being hooked on something.

6.5 Portability
L : 5 "
W : 3.4 "
H : 3.6 "
Volume : 62.4 Cu. Inches
Transmitter required : N/A

The JBL Synchros E50BT are not the most portable. They fold into a compact format and the ear cups also lay flat. Although due to the wide headband this doesn't save much space. They're a little on the larger side for over-ear headphones and will be cumbersome to carry on your person without a bag.

0 Case
Type : No case
L : N/A
W : N/A
H : N/A
Volume : N/A
7.0 Build Quality

The JBL E50BT have a pretty sturdy build quality. The ear cups look robust and dense enough to handle a few drops without getting damaged. The headband and frame are also relatively thick and flexible and should be able to withstand moderate-to-high physical stress. However, the hinge mechanism only connects on one side of the earcups, which gives them a greater range of motion but also slightly weakens the build.

7.1 Breathability
Avg.Temp.Difference : 3.9 C
Cable
Detachable : Yes
Length : 4.11 ft
Connection : 1/8" TRRS

The JBL Synchros E50BT come with two cables; a 1/8" to 1/16" TRS audio cable and a 1/16" to USB charging cable.

Top
Headshots 1
Headshots 2
8.5 Bass
Std. Err.
:
2.24 dB
Low-Frequency Extension
:
10 Hz
Low-Bass
:
2.46 dB
Mid-Bass
:
2.51 dB
High-Bass
:
1.61 dB
6.8 Mid
Std. Err.
:
4.2 dB
Low-Mid
:
-5.76 dB
Mid-Mid
:
-1.39 dB
High-Mid
:
2.58 dB
7.9 Treble
Std. Err.
:
3.55 dB
Low-Treble
:
0.68 dB
Mid-Treble
:
-0.3 dB
High-Treble
:
-4.17 dB
5.6 Frequency Response Consistency
Avg. Std. Deviation
:
1.17 dB

The frequency response consistency of the E50BT is sub-par. We measured more than 6dB of variance in bass across our 5 human subjects. The bass delivery is also sensitive to whether the user wears glasses. The treble delivery is also inconsistent and sensitive to positioning, but more consistent than the bass response.

5.5 Soundstage
PRTF Accuracy (Std. Dev.)
:
2.5 dB
PRTF Size (Avg.)
:
4.22 dB
PRTF Distance
:
6.05 dB
Openness
:
5.2
Acoustic Space Excitation
:
4.0
Correlated Crosstalk
:
0.0 dB
7.6 Imaging
Weighted Group Delay
:
0.26
Weighted Amplitude Mismatch
:
1.82
Weighted Frequency Mismatch
:
2.67
Weighted Phase Mismatch
:
7.5
7.3 Total Harmonic Distortion
Weighted THD @ 90
:
1.009
Weighted THD @ 100
:
5.71
4.7 Noise Isolation
Isolation Audio
:
Overall Attenuation
:
-10.64 dB
Bass
:
0.25 dB
Mid
:
-6.74 dB
Treble
:
-25.91 dB
Self-Noise
:
16.57 dB

Poor isolation. Due to the passive isolation and poor fit, these headphones fail to achieve any isolation in the Bass Range. The amount of isolation achieved in the Mid and Treble Ranges are also sub-par.

6.5 Leakage
Leakage Audio
:
Overall Leakage @ 1ft
:
42.51 dB

Poor Leakage. The large drivers and poor seal of these headphones cause them to leak a lot. The majority of the leakage is between 800Hz and 5Khz, with a sharp peak in loudness at 1.5KHz.

6.2 Recording Quality
Recorded Speech
:
LFE
:
210.51 Hz
FR Std. Dev.
:
3.05 dB
HFE
:
2523.3 Hz
Weighted THD
:
3.654
Gain
:
38.79 dB
6.3 Noise Handling
Speech + Pink Noise :
Speech + Subway Noise :
SpNR
:
16.01 dB
9.2 Wireless Range
Obstructed Range
:
55 ft
Line of Sight Range
:
186 ft

The JBL E50 have a great wireless range. They rarely dropped any audio either indoors and outdoors. They even maintained a stable connection slightly above 50ft when the Bluetooth source was placed in another room. This makes them a good pair of wireless headphones to use around the house or at the office. However, they have the typical hold-to-pair procedure and no NFC so it might get a little tedious to switch between Bluetooth devices.

2.5 Latency
Default Latency
:
190 ms
aptX Latency
:
N/A
aptX(LL) Latency
:
N/A
6.5 Battery
Battery Type
:
Rechargable
Battery Life
:
20.5 hrs
Charge Time
:
2.8 hrs
Power Saving Feature
:
No
Audio while charging
:
No
Passive Playback
:
Yes

The JBL E50BT have an average battery life. They last around 20 hours which makes them decent headphones to use on a long flight or a road trip. Unfortunately, there is no auto-off timer so if you leave them on they will run out of battery. You also can't use them while they're charging as the power and audio cables share the same port.

0 App Support
App Name : N/A
iOS : N/A
Android : N/A
Mac OS : N/A
Windows : N/A
Equalizer
:
N/A
ANC control
:
N/A
Mic Control : N/A
Room effects
:
N/A
Playback control
:
N/A
Button Mapping : N/A
Surround Sound : N/A

No compatible app.

6.0 Bluetooth
Bluetooth Version
:
4.0
Multi-Device Pairing
:
No
NFC Pairing
:
No
7.2 Wired
OS Compatibility
:
Not OS specific
Analog Audio
:
Yes
USB Audio
:
No
PS4 Compatible
:
Audio Only
Xbox One Compatible
:
Audio Only
PC Compatible
:
Audio Only
0 Base/Dock
Type
:
N/A
Optical Input
:
N/A
Line In
:
N/A
Line Out
:
N/A
USB Input
:
N/A
RCA Input
:
N/A
PS4 Compatible
:
N/A
Xbox One Compatible
:
N/A
PC Compatible
:
N/A
Power Supply
:
N/A
Dock Charging
:
N/A
In the box

  • JBL E50BT  headphones
  • Audio cable
  • USB Cable
  • Manual

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