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  1. Table of Contents
  2. Intro
  3. Design
    1. Style
    2. Comfort
    3. Controls
    4. Stability
    5. Portability
    6. Case
    7. Build Quality
    8. Breathability
    9. Cable
    10. Front
    11. Angled
    12. Side
    13. Rear
    14. Top
  4. Sound
    1. Bass
    2. Mid
    3. Treble
    4. Frequency Response Consistency
    5. Raw Frequency Response
    6. Soundstage
    7. Imaging
    8. Total Harmonic Distortion
  5. Isolation
    1. Noise Isolation
    2. Leakage
  6. Microphone
    1. Recording Quality
    2. Noise Handling
  7. Active Features
    1. Wireless Range
    2. Latency
    3. Battery
    4. App Support
  8. In the box
  9. Conclusion
  10. Q&A
Reviewed on Dec 07, 2017 , Marc Henney, Yannick Khong

JBL E55BT Wireless
HEADPHONES REVIEW

Usage Ratings - Version 1.1
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Test Benches:

  • 1.1: Summer 2017
  • 1.0: Winter 2017
  • 0.9: Winter 2016
6.9
Mixed Usage
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What it is This is the combination of the different use cases to evaluate how versatile the headphones are. Therefore an everyday headphone should be well-rounded enough to adapt to most situations and environments without significant losses in sound quality, design ergonomics or isolation.
Score components:
7.3
Critical Listening
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What it is The level of audio fidelity a headphone can reproduce. Therefore a balanced and true representation of bass, mids, treble, soundstage and imaging, as well as a comfortable listening experience, is essential for critical listening.
Score components:
6.5
Commute/Travel
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What it is How well the headphones handle the loud environments involved in commuting or traveling. Therefore your listening experience should be comfortable, hassle-free and as isolated from noise as possible.
7.0
Sports/Fitness
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What it is How well-adapted the headphones are, to use while doing sports or strenuous exercise. Therefore the headphones should not be too cumbersome and deliver a stable and comfortable listening experience.
6.9
Office
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What it is How well the headphones can deliver a comfortable and isolated listening experience in an office-like environment. They should not leak much and should block the noise of a busy office.
Score components:
Type : Over-ear
Enclosure : Closed-Back
Wireless : Yes
Noise-Cancelling : No
Mic : Yes
Transducer : Dynamic

The JBL E55BT are stylish-looking headphones with an above-average sound and a comfortable design. They're lightweight yet decently well-built and they're pretty easy-to-use. They do well for most use cases but do not block enough noise for very noisy environments and won't be the best headphones for watching movies or gaming.

Test Results
Design 6.8
Sound 7.4
Isolation 5.0
Microphone 6.1
Active Features 6.6
Pros
  • Comfortable and lightweight design.
  • Above-average sound quality.
Cons
  • Poor noise isolation.
  • Inconsistent bass.

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6.8

Design

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Score components:
JBL E55BT Design Picture

The JBL E55BT headphones have a simple and straightforward design. They come in a couple of color variations to match your preferences and tastes. They're also quite comfortable and lightweight so you can keep them on for hours without much fatigue. They do, however, make your ears a little hot after a while, and although decently well-built they look and feel a bit cheap once in your hands. On the upside, they're decently portable, easy-to-use, and stable enough to exercise with.

Style
JBL E55BT Design Picture 2

The JBL E55BT have a simple design and clean look. They have a relatively thin headband and decently sized oval ear cups that are well padded and relatively well-built. They have a few color schemes that stand out, like the red version we reviewed, but there's also a more understated all-black variation that some may prefer. The ear cups protrude a bit once on your ears and the buttons on the right ear cup look and feel a bit plasticky, but overall they're a stylish looking headphone that should work for most.

7.5 Comfort
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What it is: Adjustability and degrees of freedom, pressure, stiffness and weight.
When it matters: When the headphones are going to be used for long durations.
Score components: Subjectively assigned
JBL E55BT Comfort Picture
Weight : 0.5 lbs
Clamping Force
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What it is: The force that the headphones exert on your head, once you have them on. This is purely a measurement of the force applied, which does not take into account the earpad's surface area and the resulting pressure you will feel, on or around your ears.
When it matters: The tighter the headphones, the more force they put on your head. This can get uncomfortable or cause pain and soreness during long listening sessions.
:
0.9 lbs

The JBL E55BT are comfortable headphones. They have decently sized ear cups that fit well around most ears. They're lightweight and do not put much pressure on your head. However, the ear cup padding is a little stiff which is most noticeable after long listening sessions. They will get a bit fatiguing after wearing them for a while.

7.0 Controls
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What it is: The control scheme of the headphones, the number of functions provided, button layout and ergonomics as well as the quality of tactile feedback.
When it matters: If you want to control volume, pause your music or make phone calls without directly interacting with your audio device.
JBL E55BT Controls Picture
Ease of use : Average
Feedback : Average
Call/Music Control : Yes
Volume Control : Yes
Microphone Control : No
Noise Canceling Control : N/A
Talk-Through : N/A
Additional Buttons : Bluetooth Sync

The controls scheme on the JBL E55BT headphones is simple and efficient. You can skip tracks, play/pause audio, and control the volume with their easy-to-use three buttons set up. They also have an additional button to enable the Bluetooth pairing mode. The control scheme is responsive but the buttons feel a little cheaply made.

7.5 Stability
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What it is: How the headphones are designed to prevent them from slipping off your ears or falling off your head.
When it matters: If you plan on using the headphones while doing sports or other physical activities that requires a lot of movement.
Score components: Subjectively assigned
JBL E55BT Stability Picture

These headphones are stable enough to jog or work-out with but won't be the ideal headphones for intense sports. They're wireless and won't move much during physical activity thanks to the slightly tight fit. However, the protruding ear cups sway a bit when running or doing strenuous exercises.

6.3 Portability
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What it is: The volume of space occupied by the headphones when folded into their most compact format.
When it matters: If you're often on the move and need to carry your headphones in a bag, purse , or pocket.
Score components:
JBL E55BT Portability Picture
L : 5.2 "
W : 5 "
H : 2.8 "
Volume : 73 Cu. Inches
Stand required : N/A

The JBL E55BT fold into a more compact format which makes them decently portable. They're still somewhat cumbersome to carry around on your person since they won't fit in any pockets and do not come with a case. But compared to other over-ear headphones they're pretty small.

0 Case
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What it is: The provided carrying options to protect your headphones when transporting them.
When it matters: To prevent damaging your headphones, if you often carry them in your bag or pocket.
Score components: Subjectively assigned
Type : No case
L : N/A
W : N/A
H : N/A
Volume : N/A
7.0 Build Quality
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What it is: Durability, material quality, cheap/expensive feel.
When it matters: When the headphones are going to be used by multiple users (classes/studios), by children, in tough conditions, on a daily basis, or for exercise.
Score components: Subjectively assigned
JBL E55BT Build Quality Picture

The JBL E55BT have an above-average build quality, but slightly cheap and plasticky ear cups. The headband is decently flexible and has a thin metal frame that makes it sturdy enough for repeated use or accidental drops. The ear cups are also decently dense and won't get damaged if the headphones fall once or twice, but the quality of plastic used in their build feels cheap. This is most noticeable with the buttons on the right ear cup. They're a sturdy headset they just don't feel as durable as some cheaper options like the Bluedio T4.

6.4 Breathability
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What it is: How hot the headphones get when you wear them for an extended period of time.
When it matters: If you often have long listening sessions or use your headphones while doing physical activities like running or working out.
Score components:
JBL E55BT Breathability Before Picture JBL E55BT Breathability After Picture
Avg.Temp.Difference : 5.9 C

Cable
JBL E55BT Cable Picture
Detachable : Yes
Length : 4.3 ft
Connection : 1/8" TRS

Comes with a 1/8" to 1/8" TRRS audio cable with inline controls and USB charging cable.

Front
Angled
Side
Rear
Top
7.4

Sound

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What it is: How accurately the audio is reproduced. The tests are performed with the headphones' most commonly used features enabled (noise-cancelling, wireless, etc.)
JBL E55BT Frequency Response

The JBL E55BT is an above-average sounding pair of closed-back over-ear headphones. They have a deep and powerful bass, a balanced mid-range, and a neutral treble. However, the bass is slightly hyped and prone to inconsistencies, their mid-range is a bit recessed, and their treble could lack some detail. Additionally, they don't have an open and spacious soundstage.

8.0 Bass
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What it is: Frequency Response from 20Hz-250Hz
When it matters: When the material is heavy on bass frequencies, such as those of kick drums and bass guitar.
Score components:
JBL E55BT Bass
Std. Err.
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What it is: The amount of deviation (weighted standard error) in bass frequency response (20Hz-250Hz) as compared to a target response that would sound perfectly balanced to most people.
When it matters: When a balanced and neutral (reference) bass performance is desired.
Good value: <4dB
Noticeable difference: 0.1dB
:
3.03 dB
Low-Frequency Extension
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What it is: The lowest frequency at which the frequency response reaches -3dB of the target response.
When it matters: Shows how extended the bass is.
Good value: <40Hz
Noticeable difference: 5Hz
:
10 Hz
Low-Bass
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What it is: The average amount of over/under-emphasis in frequency response from 20Hz-60Hz.
When it matters: Kick drums and low frequency effects get their 'thump' from this range. Mostly felt than heard.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
3.31 dB
Mid-Bass
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What it is: The average amount of over/under-emphasis in frequency response from 60Hz-120Hz.
When it matters: Melodic bass instruments have most of their fundamental frequencies in this range. This is where the 'body' and 'punch' of the bass sits.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
3.47 dB
High-Bass
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What it is: The average amount of over/under-emphasis in frequency response from 120Hz-250Hz.
When it matters: Most instruments get their warmth and full-ness from this range. When over-emphasized, mixes tend to get muddy and boomy.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
2.42 dB

Great bass range performance in our JBL E55BT review. Low-frequency extension is at 10Hz, which is excellent. Low-bass and mid-bass are quite flat but overemphasized by more than 3dB. This adds a bit of excess kick and thump to the sound, without making it too muddy, thanks to the less overemphasized high-bass.

8.0 Mid
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What it is: Frequency Response from 250Hz-2KHz
When it matters: When the material is heavy on mid-range frequencies. This is the case for the majority of audio content.
Score components:
JBL E55BT Mid
Std. Err.
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What it is: The amount of deviation (weighted standard error) in mid frequency response (250Hz-2.5KHz) as compared to a target response that would sound perfectly balanced to most people.
When it matters: When a balanced and neutral (reference) mid performance is desired.
Good value: <4dB
Noticeable difference: 0.1dB
:
2.72 dB
Low-Mid
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What it is: The average amount of over/under-emphasis in frequency response from 250Hz-500Hz.
When it matters: Most instruments have their fundamentals or low harmonics in this range. Over-emphasis in this range sounds muddy and cluttered. Under-emphasis, thins out the vocals and lead instruments.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-4.31 dB
Mid-Mid
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What it is: The average amount of over/under-emphasis in frequency response from 500Hz-1KHz.
When it matters: This range is occupied mostly by upper harmonics. Over-emphasis sounds forward and boxy. Under-emphasis pushes instruments to the back of the mix.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
0.61 dB
High-Mid
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What it is: The average amount of over/under-emphasis in frequency response from 1KHz-2KHz.
When it matters: Most instruments, especially vocals, get their intensity and clarity from this range. Over-emphasis sounds honky and harsh, under-emphasis sounds weak and distant.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-0.16 dB

Great mid-range performance. Low-mid has a 4dB dip centering around 300Hz, which thins out the vocals a little bit. However, the rest of the mid-range is virtually flat and flawless.

8.4 Treble
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What it is: Frequency Response from 2KHz-20KHz
When it matters: When the material is heavy on high-range frequencies, such as voice, cymbals, and any other material where brightness, brilliance and airiness is desired.
Score components:
JBL E55BT Treble
Std. Err.
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What it is: The amount of deviation (weighted standard error) in treble frequency response (2.5KHz-20KHz) as compared to a target response that would sound perfectly balanced to most people.
When it matters: When a balanced and neutral (reference) treble performance is desired.
Good value: <4dB
Noticeable difference: 0.1dB
:
3.04 dB
Low-Treble
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What it is: The average amount of over/under-emphasis in frequency response from 2KHz-5KHz.
When it matters: Almost all instruments rely on this range for their presence, detail, and articulation. Over-emphasis can sound harsh and painful. Under-emphasis hurts the comprehensibility of vocals and lead instruments.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-1.11 dB
Mid-Treble
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What it is: The average amount of over/under emphasis in frequency response from 5KHz-10KHz.
When it matters: This is the sibilance range. Cymbals, vocals, and lead instruments rely on this range for brightness and presence. Over-emphasis sounds piercing and painful, under-emphasis sounds dull and lispy.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-1.68 dB
High-Treble
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What it is: The average amount of over/under-emphasis in frequency response from 10KHz-20KHz.
When it matters: This range gives brilliance and airiness to the sound. Over-emphasis sounds hissy, under-emphasis sounds closed-up and lifeless.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-4.29 dB

Very good treble range performance. The only remark here is the relatively broad 5dB dip centered around 5KHz, which negatively affects the presence and detail in vocals/leads.

5.8 Frequency Response Consistency
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What it is: The amount of deviation of each frequency response pass, from the average frequency response.
When it matters: Shows how consistently the headphones perform after re-positioning them.
Score components:
JBL E55BT Consistency L JBL E55BT Consistency R
Avg. Std. Deviation
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What it is: The average amount of deviation in frequency response of 5 re-seats, from the average frequency response.
When it matters: Shows how consistently the headphones perform after re-positioning them.
Good value: <0.5
Noticeable difference: 0.1
:
1.03 dB

Sub-par frequency response consistency. The consistency in the treble range is very good. However, in the bass range, there could be as much as 18dB of variance at 20Hz across multiple users. We also noticed having glasses on could break the seal the JBL E55BT and cause a drop in bass.

5.9 Soundstage
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What it is: Soundstage qualities are not inherent to the audio content, the headphones have to 'create' them rather than 'reproduce' them. They determine whether the sound is perceived to be coming from inside or in front of the head, how open and spacious the soundstage is, how much the headphones acoustically interact with the environment, and how strong the phantom center is.
When it matters: When an accurately produced, large and spacious soundstage, similar to that of a stereo loudspeaker setup is desired.
PRTF Error
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What it is: The average amount of deviation in Pinna-Related Transfer Function of the headphones, compared to that of a loudspeaker. Whether the soundstage is perceived to be unnatural, located inside or in front of the head, is dependent on this quality. The more the headphones activate the HRTF resonances of the ear (similar to what loudspeakers do), the more the soundstage will be pulled out from inside the listener's head. This quality affects both stereo and mono content.
When it matters: When a natural, in-the-front soundstage is desired, similar to that of a loudspeaker.
Good value: <5
Noticeable difference: 0.5
:
7.11 dB
Openness
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What it is: How open the headphones are, and how open and spacious they sound. This quality affects both stereo and mono content. This test differentiates between acoustically and electronically produced crosstalk and only takes the acoustically generated crosstalk into account. This value is the inverse of the Noise Isolation test score.
When it matters: When an open, wide and roomy sound is desired. A value of 10 indicates a fully open headphone, and a value of 0 indicates a fully closed headphone.
Good value: >7.5
Noticeable difference: 0.5
:
7.1
Acoustic Space Excitation
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What it is: How loud the headphones are, and how much they excite their environment acoustically. If the headphones are loud and open enough, the sound leaking from the headphones takes some of the characteristic of its environment (reflections/reverb) before reflecting back into the open headphones and to the listener's ears. This quality affects both stereo and mono content. This value is the inverse of the Leakage test score.
When it matters: When an open, wide and roomy sound is desired.
Good value: >7.5
Noticeable difference: 0.5
:
3.6
Correlated Crosstalk
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What it is: How strong and solid the phantom center is. This is mostly a stereo quality and its effects on mono content are minimal. This test is sensitive to the phase of the crosstalk and whether it is produced acoustically or electronically.
When it matters: When a true reproduction of the stereo image is desired. A value of 0 indicates no crosstalk, or that the existing crosstalk is not correlated enough to affect the phantom center. A negative score means the crosstalk is out of phase with the original signal, resulting in a slightly wider stereo image at the expense of creating a 'hole' at the center of the stereo field. A positive score means the crosstalk is in phase and positively affecting the phantom center.
Good value: >1dB
Noticeable difference: 0.3dB
:
0.0 dB

Sub-par soundstage performance. Due to the relatively shallow cups, as well as the closed-back design, these headphones don't produce a speaker-like soundstage.

6.3 Imaging
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What it is: Imaging qualities are inherent to the audio content, the headphones have to 'reproduce' them rather than 'create' them. They determine how accurately the objects are positioned in the stereo image, and how transparent the imaging is.
When it matters: When accurate positioning of the objects in the stereo image, and clear and transparent imaging is desired.
JBL E55BT Phase Response
Phase Error
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What it is: The average amount of deviation in the phase, from the ideal flat response.
When it matters: When an accurate and transparent imaging is desired.
Good value: <60°
Noticeable difference: 10°
:
120.62 °
Driver Mismatch (Amplitude)
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What it is: The Left/Right balance of our test unit, that is, the amount of amplitude difference between the left and right drivers. This is not a design test, but a marker for manufacturing tolerance and ergonomics.
When it matters: When a properly balanced stereo image and low manufacturing tolerance is desired. A poor score indicates a noticeable difference in level between the left and right drivers.
Good value: <0.3dB
Noticeable difference: 0.1dB
:
0.78 dB
Driver Mismatch (Frequency)
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What it is: The amount of difference (Std. Err.) between the frequency response of the left and right drivers of our test unit. This is not a design test, but a marker for manufacturing tolerance and ergonomics.
When it matters: When an even and stable stereo image, as well as a low manufacturing tolerance, is desired. A poor score indicates there may be 'holes' in the stereo image at certain frequencies.
Good value: <2dB
Noticeable difference: 0.1dB
:
2.09 dB
Driver Mismatch (Phase)
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What it is: The amount of difference (Std. Err.) between the phase response of the left and right drivers of our test unit. This is not a design test, but a marker for manufacturing tolerance and ergonomics.
When it matters: When an even and stable stereo image, as well as a low manufacturing tolerance, is desired. A poor score indicates there may be inaccuracies in the stereo image reproduction at certain frequencies.
Good value: <90°
Noticeable difference: 30°
:
27.06 °

Mediocre imaging performance. Phase error is relatively high, especially in the lower frequencies. Additionally, the L/R drivers of our test unit showed more than 27 degrees of phase mismatch, which could skew the stereo image a little bit.

7.3 Total Harmonic Distortion
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What it is: The subtle, unwanted frequencies (harmonics) produced alongside the intended frequencies.
When it matters: When clean and pure sound reproduction is desired, though its effect is not as noticable as frequency response.
Score components:
JBL E55BT Distortion
Weighted THD @ 90
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What it is: The overall amount of harmonic distortion measured at 90dB SPL. To make the score more perceptually relevant, more weight is given to the higher frequencies.
When it matters: How pure the sound is at moderate listening levels.
Good value: <0.100
Noticeable difference: 0.1
:
1.312
Weighted THD @ 100
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What it is: The overall amount of harmonic distortion measured at 100dB SPL. To make the score more perceptually relevant, more weight is given to the higher frequencies.
When it matters: How pure the sound is at loud listening levels.
Good value: <0.300
Noticeable difference: 0.1
:
4.41

Average harmonic distortion performance. At 90dB SPL, the overall amount of THD is low and within good limits. At higher volumes, however, there is a noticeable rise in distortion the bass range and around 5KHz which could make the treble sound a bit harsh.

5.0

Isolation

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Score components:

The JBL E55BT only passively isolate against ambient noise. They create a decent seal around your ears that blocks some high-frequency noise from seeping into your audio. However, in most cases, they won't isolate enough for loud, noisy environments like those involved in commuting and traveling. You can mask some of the noise if you play your music at higher volumes but the headphones will leak a little and may distract those around you.

4.3 Noise Isolation
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What it is: How much outside noise is blocked out by putting the headphones on.
When it matters: If the headphones are going to be used in a noisy envinronment (airplane, subway, etc.)
Score components:
JBL E55BT Noise Isolation
Overall Attenuation
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What it is: The overall amount of environmental noise reduction in dB.
When it matters: In loud envinronments like planes, trains, offices, etc.
Good value: <-20dB
Noticeable difference: 1dB
:
-11.34 dB
Bass
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What it is: The overall amount of noise isolation in the bass range (20Hz-250Hz).
When it matters: When the outside noise is bass-heavy, like in airplanes.
Good value: <-15dB
Noticeable difference: 1dB
:
0.86 dB
Mid
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What it is: The overall amount of noise isolation in the mid-range (250Hz-2.5KHz).
When it matters: When the environment's noise is mid-heavy, like in an office.
Good value: <-15dB
Noticeable difference: 1dB
:
-6.92 dB
Treble
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What it is: The overall amount of noise isolation in the treble range (2.5KHz-20KHz).
When it matters: When the environment's noise is treble-heavy. Although uncommon, areas with sharp sounds fall under this category.
Good value: <-30dB
Noticeable difference: 1dB
:
-28.51 dB
Self-Noise
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What it is: The amount of noise created by the active electronics of the headphones (if applicable), measured from 300Hz-20KHz. Applies mostly to wireless and noise-cancelling headphones.
When it matters: If too loud, it could become distracting when listening to quiet material like podcasts and audiobooks.
Good value: <16dB
Noticeable difference: 1dB
:
21.25 dB

Poor isolation. These headphones don't have active noise cancelling and isolate only using their ear cups. In the bass range, they achieve no isolation, and in the mid-range, they achieve only 7dB of reduction which is sub-par. In the treble range, however, they isolate by more than 28dB, which is above average.

6.4 Leakage
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What it is: The amount of sound bleeding out of the headphones.
When it matters: When the listener doesn't want people around them (in office, recording studio, etc.) to hear what is being listened to.
Score components:
JBL E55BT Leakage
Overall Leakage @ 1ft
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What it is: The amount of sound leakage heard 1 foot away from the user, while the user is listening to a 100dB SPL signal.
When it matters: When you don't want people hear what you are listening to.
Good value: <35dB
Noticeable difference: 1dB
:
42.91 dB

Mediocre leakage performance. The significant portion of leakage sits between 500Hz and 4KHz, which is a relatively broad range and concentrated in the mid-range. The overall level of leakage is not very loud though.

6.1

Microphone

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What it is: The microphone section shows the quality of speech capture and transmission by the mic, as well as how well the microphone under test handles noisy environments.
When it matters: For your speech to be transmitted to and understood properly by the listener, the microphone needs to have a good recording quality. If the environment the microphone is being used in is noisy, a microphone with a good noise handling performance would be needed as well.
Score components:

Mediocre microphone performance. Speech recorded with the JBL E55BT will sound relatively thin and noticeably muffled, and this will have a negative effect on speech intelligibility. They also don't have great noise handling, making them unsuitable for moderately loud environments like a busy street.

6.3 Recording Quality
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What it is: Microphone recording quality shows how natural, neutral, extended and intelligible speech would be with the device under test, in a quiet environment.
When it matters: A microphone with a good recording quality ensures that the person listening to you would hear a full, clear, and easily understandable speech. Therefore, it is important whenever a good quality of speech transmission and intelligibility is needed.
Score components:
JBL E55BT Microphone Frequency Response
Recorded Speech
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What it is: Actual audio recording of the headphone's microphone, recorded while placed on the dummy head, with speech being played back through the dummy head's mouth simulator.
When it matters: When a clean, full, and intelligible speech transmission is required.
:
LFE
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What it is: Low-frequency extension shows how deep the bass response of the microphone is, and therefore, how deep and full your voice would sound to the listener. It is the lowest frequency at which the frequency response reaches -3dB of the target response.
When it matters: LFE is not a big factor in speech intelligibility and even speech recorded with a mic that has an LFE of 500Hz could still be easily understood. Therefore, it is mostly important if you are concerned with how deep and full your voice would be heard.
Good value: <150Hz
Noticeable difference: 30Hz
:
281.0 Hz
FR Std. Dev.
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What it is: Frequency Response Standard Deviation shows how accurately and balanced sound is captured by the microphone at each frequency. FR Std. Dev. is calculated between LFE and HFE, and the rest of the spectrum is ignored.
When it matters: A good frequency response is desired when a natural and neutral speech quality is desired. As opposed to HFE which is more a metric for speech intelligibility, frequency response could be considered as a metric for a natural and neutral sound.
Good value: >3.5dB
Noticeable difference: 0.5dB
:
4.63 dB
HFE
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What it is: High-frequency extension is the highest frequency at which the frequency response reaches -3dB of the target response. It shows how extended the treble response of the microphone is.
When it matters: HFE is one the most important factors in speech intelligibility. The higher the HFE, the brighter, more open, and more extended the speech quality will be which makes it a lot easier to understand by the listener.
Good value: >8KHz
Noticeable difference: 1KHz
:
3517.32 Hz
Weighted THD
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What it is: The unwanted frequencies (harmonics) produced alongside the intended frequencies, which cause deformation of an output signal compared to its input.
When it matters: When clean and pure sound reproduction is desired, though its effect is not as noticable as frequency response.
Good value: <1.5
Noticeable difference: 1.0
:
4.426
Gain
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What it is: Shows how much louder the microphone can go above our reference loudness level. The gain value is reported relative to our reference level, which is 94dB at a distance of 5cm from the mouth.
When it matters: A microphone with a high gain is important when the input signal (speech) is very quiet. For example when whispering, or talking on the phone in a library.
Good value: >18dB
Noticeable difference: 3dB
:
36.74 dB

Mediocre recording quality. LFE is at 280Hz, and HFE is at 3.5KHz. This makes recorded speech to sound relatively thin and muffled. The region between LFE and HFE is also relatively inconsistent, which is not good.

6.0 Noise Handling
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What it is: How well the microphone is able to separate speech from background noise, so that the transmission would include more voice and less noise.
When it matters: When a clean and intelligible speech transmission is desired in a noisy situation like talking on the phone on a busy street or on the bus.
Score components:
JBL E55BT SpNR
Speech + Pink Noise :
Speech + Subway Noise :
SpNR
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What it is: Speech to Noise Ratio is the difference in level between speech and background noise as heard by the listener
When it matters: If the microphone is going to be used in a noisy environment, it is important for it to be able to separate the speech from background noise, so the voice would be easily audible and understandable.
Good value: >24dB
Noticeable difference: 3dB
:
11.35 dB

Mediocre noise handling. The E55BT is not able to separate speech from ambient noise effectively, and only achieves about 11dB of speech-to-noise ratio.

6.6

Active Features

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What it is: Headphones with active components that require a battery. This includes noise cancelling and wireless headphones that actively reduce noise or transmit audio via a wireless connection.
When it matters: How suitable the power and wireless specifications of an active headphone will be, depending on your listening habits. The range and/or discharge time of the active headphone you select will be important if you're often on the move or have long uninterrupted listening sessions.
Score components:

The JBL E55BT have an above-average wireless range and a good battery life but won't be ideal for watching movies. They have about 185ms of latency which shouldn't be an issue when streaming audio but won't be suitable for gaming. They also do not support the JBL Headphones app which makes them less customizable than the Everest Elite 700 and also means they do not have an adjustable auto-off timer, which is a bit ​disappointing.

7.3 Wireless Range
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What it is: Headphones that offer a cable-free listening experience over a wireless network, typically via Bluetooth or radio frequency.
When it matters: If you don't want to be limited by the length of an audio cable. This means having the freedom to move around in your home or office with a much greater range than an audio cable could provide, especially, if the Bluetooth source is heavy or difficult to carry.
Score components:
Type
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What it is: The type and version of the wireless network, the headphones use to connect to the audio source. This could either be Bluetooth or radio frequency.
When it matters: The Bluetooth version will determine how compatible the headphones are with your Bluetooth enabled devices. Typically, newer Bluetooth versions are backward compatible with older ones but may lack the additional features that more recent Bluetooth protocols provide.
:
Bluetooth 4.1
Obstructed Range
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What it is: The range that the wireless headphones can reach before dropping any audio when the Bluetooth source was placed in another room.
When it matters: If you can't or prefer not to carry your Bluetooth source on you, while listening to your audio in an indoor environment. Although, the obstructed wireless range will slightly depend on your home or office layout.
Good value: >35ft
Noticeable difference: 5ft
:
37 ft
Line of Sight Range
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What it is: The range that the wireless headphones can reach before dropping any audio when in direct line of sight of the Bluetooth device.
When it matters: If you can't or prefer not to carry your Bluetooth source on you, while listening to your audio in a large and open environment.
Good value: 170ft or more
Noticeable difference: 10ft
:
119 ft
NFC
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What it is: Near Field Communication technology that allows you to quickly, pair your headphones with your Bluetooth and NFC-enabled device.
When it matters: This makes pairing with an NFC-enabled device a lot easier than the typical and often tedious hold-to-pair procedure that most wireless headphones have.
:
No

The JBL E55bt have an above-average wireless range. They reached up to 37ft when the Bluetooth source was obstructed by walls and almost 119ft in direct line-of-sight. Unfortunately, they don't have NFC for easy pairing but the dedicated Bluetooth sync button is pretty easy-to-use.

2.7 Latency
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What it is: The latency is how long it takes for audio to play through your headphones once the audio signal has been sent from a source.
When it matters: When gaming or watching movies. High latency means you will hear the audio much later than the images you see on screen.
Score components:
Base Latency
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What it is: The Base RF latency or the default sub-band coding (SBC) of most Bluetooth headphones.
When it matters: When watching videos a high latency can cause sync issues between the images you see and the audio you hear.
Good value: 50ms or less
Noticeable difference: 15ms
:
185 ms
aptX Latency
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What it is: An audio coding algorithm (Codec) that improves bit rate efficiency. It reduces latency and improves sound quality over Bluetooth.
When it matters: For better sound quality if your often streaming music over Bluetooth. Also it slightly improves latency when watching videos with wireless headphones.
Good value: 50ms or less
Noticeable difference: 15ms
:
N/A
aptX(LL) Latency
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What it is: Low latency variation of aptX that significantly reduces sync issues between video and sound when using Bluetooth headphones.
When it matters: When watching videos or gaming latency is a lot more noticeable than just listening to music.
Good value: 50ms or less
Noticeable difference: 5ms
:
N/A

The E55BT won't be ideal for watching video content. They perform about as well as most Bluetooth headphones with no low latency codecs.

7.8 Battery
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What it is: The power source of your headphones. All headphones with active features have a battery that will deplete over time.
When it matters: To continue using the active features of your headphones. Some models lose features or switch off completely when the battery is drained, which limits what you can do with them until the next charge.
Score components:
Battery Type
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What it is: The type of battery that the headphones use. Usually AAA or embedded, Li-ion rechargeable batteries.
When it matters: When your headphones run out of power. Rechargeable batteries usually charge via the headphones Micro-USB port whereas AAA batteries have to be replaced or charged with an external device.
:
Rechargable
Battery Life
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What it is: The amount of time it takes for a headphones' battery to be completely drained. Battery life will vary depending on the active features used and volume level.
When it matters: For active headphones that connect wirelessly, have noise cancellation or other audio-enhancing features, that cease to work once the battery is dead.
Good value: >10hrs
Noticeable difference: 0.5hrs
:
18.5 hrs
Charge Time
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What it is: The amount of time your active headphones have to be connected to a power source to charge from 0 to a 100%. However, charging time will vary depending on your power source.
When it matters: To be able to use the active features of your headphones. Especially, wireless ones that completely switch off and need to be recharged when the battery is dead.
Good value: 2h or less
Noticeable difference: 0.25h
:
1.9 hrs
Auto-off
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What it is: A feature that turns off the headphones, after a set time, when they're not in use.
When it matters: To prolong battery life when the headphones are not being used, or if you forget to manually turn off your headphones.
:
No
Audio while charging
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What it is: Some active headphones remain usable while charging. They continue to stream audio and do not disable other active features.
When it matters: This makes sure that your headphones's battery are not being drained when your relatively close to a power source. However, this means wireless headphones will need a wired connection to the power source during the charging process.
:
Yes
Passive Playback
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What it is: Active headphones that still work when all their active features are turned off or out of power.
When it matters: If you run out of power and do not have spare AA/AAA batteries or access to a power source to recharge your headphones.
:
Yes

These headphones have an above-average battery life and decent charge time. They do not have an auto-off timer like the Everest Elite 700, but have passive playback, and you can use them while they charge which makes them decent office headphones if you don't mind having the USB cable plugged into your PC.

0 App Support
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What it is: The additional app provided to enhance your listening experience. They typically deliver a set of practical features that give you more control over the sound, noise cancelling and effects that the headphones produce.
When it matters: An app with a lot of features allows you to customize your listening experience to suit your taste and preferences. For example, additions like an equalizer can give you more bass or treble and room effects can simulate a bigger Soundstage in closed back headphones.
Score components: Subjectively assigned
App Name :

Does not support the JBL Headphones app.

In the box

JBL E55BT In the box Picture

  • JBL E55BT Headphones
  • Audio cable
  • USB cable
  • Manuals

Conclusion

6.9Mixed Usage
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What it is This is the combination of the different use cases to evaluate how versatile the headphones are. Therefore an everyday headphone should be well-rounded enough to adapt to most situations and environments without significant losses in sound quality, design ergonomics or isolation.
Score components:
Decent for mixed-usage. The JBL E55BT have a good battery life and a comfortable design. They're a bit plasticky but decently well-built. They also have a fairly balanced sound that won't be ideal for critical listening but should satisfy most casual listeners. However, they do not block a lot of noise and they won't be the best headphones to game or watch movies with.
7.3Critical Listening
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What it is The level of audio fidelity a headphone can reproduce. Therefore a balanced and true representation of bass, mids, treble, soundstage and imaging, as well as a comfortable listening experience, is essential for critical listening.
Score components:
Better-than-average for critical listening. The JBL E55BT are comfortable and fairly well balanced. They have a good bass that doesn't drown instruments and vocals, and tapered high tones that do not sound too sharp. Unfortunately, their soundstage is subpar, due to their closed-back design, and they're a bit inconsistent in the bass range, especially, if you wear glasses.
6.5Commute/Travel
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What it is How well the headphones handle the loud environments involved in commuting or traveling. Therefore your listening experience should be comfortable, hassle-free and as isolated from noise as possible.
Average for commuting. They're lightweight, easy-to-use, and decently portable. However, they do not block a lot of noise so they won't be ideal if you have a very noisy commute.
7.0Sports/Fitness
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What it is How well-adapted the headphones are, to use while doing sports or strenuous exercise. Therefore the headphones should not be too cumbersome and deliver a stable and comfortable listening experience.
Average for sports. They're relatively lightweight and tight enough to stay on your head when jogging. Their wireless design also makes them less likely to fall because the audio cable got hooked on something. However, they get fairly warm during physical activity which is not ideal.
6.9Office
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What it is How well the headphones can deliver a comfortable and isolated listening experience in an office-like environment. They should not leak much and should block the noise of a busy office.
Score components:
Decent for office use. They do not block a lot of noise so you will hear what's going on around you in a lively office, but on the upside they do not leak much at average volumes.
Below average for home theater use. They're comfortable and have a good wireless range, but their latency performance is a bit too high for watching movies.
Below average for gaming. They have a bit too much latency and a mediocre mic.
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