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Products in this category are scored under Frontum Headphones Methodology v1.0: technical specifications plus authentic consumer ratings, with 0% commercial bias.
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Koss QZ900 Review | 93 Data compared

Avg. price:~£250Form factor:over-earConnectivity:wiredBattery life:N/A hoursActive noise cancellation (ANC):yes

Koss QZ900 Review: Compare 93 technical specifications and user reviews to see how this product ranks in the Headphones category and whether it is worth buying.

6.5/10

Overall score

Score
6.5/ 10
✕
What it is
An overall evaluation of the headphones' quality, based on technical analyses and user reviews.
When it matters
When you need a quick reference to identify the best headphones on the market.
Score distribution
▼
<55-66-77-88-99-10
▲ Better than 64% of models
Score components

80%

6.5

Technical score

20%

?

User score

▲Better than 64% of headphones
7.3

Value for money

Value for money
7.3/ 10
✕
What it is
An indicator that combines the headphones' overall rating with their cost.
When it matters
When you are looking for headphones that offer a strong balance of performance, features, and price.
Score distribution
▼
<55-66-77-88-99-10
▼ Worse than 51% of models
Score components

70%

6.5

Overall score

30%

9.2

Price

▼Worse than 51%
6.5

Technical score

Technical score
6.5/ 10
✕
What it is
An assessment of technical performance for products in the Headphones category across these key areas: Sound, Calls & Controls, Connectivity, Features, Battery, Design.
When it matters
When you want to compare headphones based on technical performance and available features.
Score distribution
▼
<55-66-77-88-99-10
▲ Better than 70% of models
Score components

52%

8.2

Sound

20%

4.0

Features

10%

7.1

Design

8%

4.0

Connectivity

6%

4.3

Battery

4%

5.2

Calls & Controls

▲Better than 70%
?

User score

User score
8.0/ 10
✕
What it is
A rating that combines user reviews and the total number of reviews received by the headphones.
When it matters
When you want to understand how headphones perform in real listening and how reliable they are in terms of comfort, audio quality, battery life, and long-term use.
Score distribution
▼
<55-66-77-88-99-10
▼ Worse than 58% of models
Score components

70%

?

User ratings

30%

?

Number of reviews

  • No image
No image
Where to buy
    N/A~ £250
Best rankings
Available: ranking among products currently available (including other versions of this product).All: ranking among all products in the database.
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Technical Specifications of pair of headphones Koss QZ900

Technical score
Technical score
6.5/ 10
✕
What it is
An assessment of technical performance for products in the Headphones category across these key areas: Sound, Calls & Controls, Connectivity, Features, Battery, Design.
When it matters
When you want to compare headphones based on technical performance and available features.
Score distribution
▼
<55-66-77-88-99-10
▲ Better than 70% of models
Score components:

52%

8.2

Sound

20%

4.0

Features

10%

7.1

Design

8%

4.0

Connectivity

6%

4.3

Battery

4%

5.2

Calls & Controls

6.5
User score
User score
8.0/ 10
✕
What it is
A rating that combines user reviews and the total number of reviews received by the headphones.
When it matters
When you want to understand how headphones perform in real listening and how reliable they are in terms of comfort, audio quality, battery life, and long-term use.
Score distribution
▼
<55-66-77-88-99-10
▼ Worse than 58% of models
Score components

70%

?

User ratings

30%

?

Number of reviews

?
Popularity
Popularity
1.0/ 10
✕
What it is
An indicator based on the number of reviews received by the headphones.
When it matters
When you prefer headphones that have already been chosen and reviewed by many other users.
Score distribution
▼
<55-66-77-88-99-10
▼ Worse than 99% of models
Popularity:
Koss QZ900 has a popularity score of 1 point, which is lower than that of 73.4% of products in this category.
1.0
Value for money
Value for money
7.3/ 10
✕
What it is
An indicator that combines the headphones' overall rating with their cost.
When it matters
When you are looking for headphones that offer a strong balance of performance, features, and price.
Score distribution
▼
<55-66-77-88-99-10
▼ Worse than 51% of models
Score components:

70%

6.5

Overall score

30%

9.2

Price

7.3
Active noise cancellation (ANC)
yes
This pair of headphones supports active noise cancellation. 72.6% of headphones support active noise cancellation.
Driver type
dynamic
Driver size
?
Number of drivers
1
Market range: <1 – >4
This pair of headphones uses 1 drivers, fewer drivers than 4% of headphones and equal to 96% of headphones.
Lowest frequency
20 Hz
Market range: <5 Hz – >20 Hz
This pair of headphones reaches a lowest frequency of 20 Hz, higher lowest frequency than 50.8% of headphones and equal to 47.3% of headphones.
Show more
Noise-canceling microphone
no
This pair of headphones does not support a noise-canceling microphone. 39% of headphones support noise-canceling microphones.
Can be used as a headset
no
This pair of headphones is not headset-ready, while 15.1% is. 84.9% of headphones can be used as headsets.
Number of microphones
2
Market range: <0 – >4
This pair of headphones has 2 microphones, more microphones than 77.9% of headphones and equal to 8.9% of headphones.
Boom microphone
no
This pair of headphones does not include a boom microphone. 13.5% of headphones have a boom microphone.
Microphone SNR
N/A
Show more
Connectivity
wired
This pair of headphones supports wired connectivity, less flexible connectivity than 49.2% of headphones and equal to 50.8% of headphones.
Bluetooth version
N/A
Maximum Bluetooth range
N/A
Audio latency
N/A
Multipoint support
no
This pair of headphones does not support multipoint. 30.6% of headphones support multipoint.
Show more
Ambient sound mode
no
This pair of headphones does not offer ambient sound mode. 24.9% of headphones support ambient sound mode.
EQ support
no
This pair of headphones does not support EQ customization. 23.2% of headphones support EQ.
Companion app
no
This pair of headphones does not work with a companion app. 21.6% of headphones support companion apps.
Adjustable ANC levels
N/A
Voice assistant support
no
This pair of headphones does not support voice assistants. 60.9% of headphones support voice assistants.
Show more
Battery life
N/A
Battery life with ANC
N/A
Charging time
N/A
Quick charge
no
This pair of headphones does not support quick charging. 33.1% of headphones support quick charge.
Battery capacity
N/A
Show more
Brand name
Koss
Form factor
over-ear
Weight
218 g
Market range: <14 g – >340 g
This pair of headphones weighs 218 g, lighter than 49.9% of headphones and equal to 0.3% of headphones.
Acoustic design
closed-back
Clamp force
?
Show more

Koss QZ900 vs the average pair of headphones

246810TotalDesignSoundBatteryConnectivityCalls & ControlsFeatures
  • Active noise cancellation
    This pair of headphones supports active noise cancellation, the average pair of headphones does not. 27.5% of headphones support active noise cancellation.
  • In-line controls
    This pair of headphones includes in-line controls, the average pair of headphones does not. 36.6% of headphones support in-line controls.
  • 1 more microphones
    This pair of headphones has more microphones than the average pair of headphones (2 vs 1). The average headphones have 1 microphones.
    2 vs 1
  • 0.12 % lower distortion
    This pair of headphones has a lower total harmonic distortion than the average pair of headphones (0.2 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.
    0.177 % vs 0.3 %
  • Removable battery
    This pair of headphones has a removable battery, the average pair of headphones does not. 7.8% of headphones have a removable battery.
  • Active noise cancellation
    This pair of headphones supports active noise cancellation, the average pair of headphones does not. 27.5% of headphones support active noise cancellation.
  • 0.12 % lower distortion
    This pair of headphones has a lower total harmonic distortion than the average pair of headphones (0.2 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.
    0.177 % vs 0.3 %
  • Removable battery
    This pair of headphones has a removable battery, the average pair of headphones does not. 7.8% of headphones have a removable battery.
  • In-line controls
    This pair of headphones includes in-line controls, the average pair of headphones does not. 36.6% of headphones support in-line controls.
  • 1 more microphones
    This pair of headphones has more microphones than the average pair of headphones (2 vs 1). The average headphones have 1 microphones.
    2 vs 1
  • No voice assistant support
    This pair of headphones does not support voice assistants, the average pair of headphones does. 60.8% of headphones support voice assistants.
  • Not headset-ready
    This pair of headphones is not headset-ready, while the average pair of headphones is. 84.8% of headphones can be used as headsets.
  • 2 Hz weaker bass extension
    This pair of headphones has a higher lowest frequency than the average pair of headphones (20 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
    20 Hz vs 18 Hz
  • 9 mm tighter earcup height
    This pair of headphones has tighter earcup height than the average pair of headphones (51 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.
    51 mm vs 60 mm
  • No battery indicator
    This pair of headphones does not show battery level clearly, while the average pair of headphones does. 56.3% of headphones have a battery level indicator.
  • 5.87x less popular
    Koss QZ900 is less popular than the average pair of headphones (1 vs 5.9).
    1 vs 5.87
  • 2 dB/mW lower sensitivity
    This pair of headphones has a lower sensitivity than the average pair of headphones (100 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
    100 dB/mW vs 102 dB/mW
  • 2.78x more expensive
    Koss QZ900 is more expensive than the average pair of headphones (£250 vs £90).
    £250 vs £90
  • 5.87x less popular
    Koss QZ900 is less popular than the average pair of headphones (1 vs 5.9).
    1 vs 5.87
  • 2.78x more expensive
    Koss QZ900 is more expensive than the average pair of headphones (£250 vs £90).
    £250 vs £90
  • 9 mm tighter earcup height
    This pair of headphones has tighter earcup height than the average pair of headphones (51 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.
    51 mm vs 60 mm
  • 2 Hz weaker bass extension
    This pair of headphones has a higher lowest frequency than the average pair of headphones (20 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
    20 Hz vs 18 Hz
  • 2 dB/mW lower sensitivity
    This pair of headphones has a lower sensitivity than the average pair of headphones (100 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
    100 dB/mW vs 102 dB/mW
  • 10 dB lower max SPL
    This pair of headphones has a lower max SPL than the average pair of headphones (100 dB vs 110 dB). The average headphones reach a max SPL of 110 dB.
    100 dB vs 110 dB
  • No battery indicator
    This pair of headphones does not show battery level clearly, while the average pair of headphones does. 56.3% of headphones have a battery level indicator.
  • Not headset-ready
    This pair of headphones is not headset-ready, while the average pair of headphones is. 84.8% of headphones can be used as headsets.
  • No voice assistant support
    This pair of headphones does not support voice assistants, the average pair of headphones does. 60.8% of headphones support voice assistants.
  • 11 older release date
    This pair of headphones was released earlier than the average pair of headphones (2005 vs 2016). The average headphones were released in 2016.
    2005 vs 2016

Video reviews

Hands-on testing, unboxing, and real-world video evaluations

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Expert reviews

In-depth analysis and verdict from leading tech publications

R
rtings.com
29/02/2016
Summary of the review
Koss QZ900 Headphones Review - RTINGS.com RTINGS.com
C
consumerreports.org
Unknown
Summary of the review
Koss QZ900 Headphone Review - Consumer Reports Consumer Reports
ljudochbild.se
10/05/2010
Review · Noise-cancelling headphones
Verdict
The Koss QZ900 is a small, light pair whose noise cancelling blocks low hum well, but the active circuit makes the sound thin and adds hiss.
audio.com.pl
31/05/2013
Test · Wired noise-cancelling headphones
Verdict
The Koss QZ900 is a well-fitting pair whose noise cancelling turns airplane roar into a soft hum, but with it switched off the sound turns dull.
0
01net.com
06/06/2010
Summary of the review
Koss QZ900 Review: Welcome to the World of Silence
(Translated)Show original
01net.com
07/04/2010
Lab test · Noise-cancelling headphones
Verdict
The Koss QZ900 is an effective, comfortable noise-cancelling headphone for long listening, but its AAA battery is not supplied and is awkward to fit.

Third-party reviews

What customers like about Koss QZ900

  • Lightweight and generally comfortable for most users
  • Excellent passive seal that prevents sound leakage
  • Comes with a protective carrying case for safe transportation
  • Active Noise Cancellation (ANC) can be used independently of music
  • Wired design ensures negligible latency for movies or gaming
  • Durable rugged construction mentioned by some long-term owners
  • Koss Lifetime Warranty provides long-term value and peace of mind

What customers don't like about Koss QZ900

  • Active Noise Cancellation is often described as minimal or weak
  • Noticeable electronic hiss when ANC is activated
  • Sound profile is heavily skewed toward bass, making it 'dark' and less detailed
  • All-plastic build can feel cheap or less premium to some users
  • Lack of adequate in-line controls for volume or playback
  • Cables are described by some users as short and flimsy
  • Vinyl ear pads can become hot or sticky during prolonged use

Verdict

The Koss QZ900 is a closed-back, over-ear wired headphone featuring battery-powered active noise cancellation (ANC) and passive isolation designed for travel and office environments. Key technical specifications include 40mm dynamic drivers, a frequency response range of 20Hz to 20,000Hz, 32 ohms impedance, and a sensitivity of 100 dB SPL. Its main pros include a foldable design for portability, a detachable 4-foot cord with in-line volume control, and a long ANC battery life of up to 50 hours on a single AAA battery. However, cons include a primarily plastic build that may feel less durable, a recessed high-frequency response, and noise isolation that may struggle in very loud commuting environments.

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