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AKG K551 Review | 93 Data compared

Avg. price: ~£180
Form factor: over-ear
Connectivity: wired
Battery life: N/A hours
Active noise cancellation (ANC): no

AKG K551 review. Compare 93 technical specifications and user reviews to see how it ranks among headphones and if it is worth buying.

5.2

Good

4.9

Poor

6.4

Good

2.1
Gaming
Score components:
35.0%
0.0
Audio latency
25.0%
0.0
Low-latency game mode
20.0%
10
Can be used as a headset
12.0%
1.0
Noise-canceling microphone
8.0%
0.0
Battery life
0.8
Travel
Score components:
28.0%
1.0
Active noise cancellation (ANC)
24.0%
0.0
Battery life
18.0%
3.1
Weight
16.0%
0.0
Multipoint support
14.0%
0.0
Ambient sound mode
2.7
Calls
Score components:
28.0%
1.0
Noise-canceling microphone
24.0%
10
Can be used as a headset
18.0%
0.0
Multipoint support
16.0%
0.0
Battery life
14.0%
0.0
Companion app
3.1
Workout
Score components:
28.0%
3.1
Weight
24.0%
1.0
Water resistance
20.0%
4.0
IP rating
16.0%
0.0
Battery life
12.0%
10
Can be used as a headset

Best prices in UK

Best rankings

Verdict

The AKG K551 is a closed-back, over-ear reference-class headset featuring massive 50mm dynamic drivers and proprietary Real Image Engineering designed to create a spacious, dimensional soundstage typically associated with open-back designs. Technical specifications include a frequency response of 12Hz to 28kHz, a low 32-ohm impedance for easy drivability from mobile devices, and a high sensitivity of 114dB SPL/V. Key strengths include its sturdy build quality, excellent passive noise isolation, and a neutral, detailed sound profile suited for classical or acoustic music, further enhanced by a 1.2m oxygen-free cable with an in-line microphone and remote for iOS devices. However, it is often criticized for being bulky and less portable than competitors, having a thin non-removable cable, and lacking sub-bass impact if a perfect ear-pad seal is not achieved.

Technical Specifications of AKG K551

Overall score

5.2

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Popularity

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.

Sound

5.4

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Active noise cancellation (ANC)

What it is: Reduces background noise using active technology

When it matters: When blocking office, travel, or aircraft noise is a priority.

Importance: HIGH

Driver type

What it is: Type of speaker driver technology used

When it matters: When the underlying sound character and driver technology matter to you.

Importance: MEDIUM

dynamic

Driver size

What it is: Diameter of the speaker driver unit

When it matters: When you want extra hardware context behind how the headphones may handle bass weight, scale, or overall presentation.

Importance: MEDIUM

Number of drivers

What it is: Total number of speaker drivers per earcup

When it matters: When multi-driver designs are part of your buying criteria.

Importance: LOW

Lowest frequency

What it is: Lowest audio frequency the headphones can reproduce

When it matters: When deeper bass extension matters for your music or movie listening.

Importance: MEDIUM

Good value: <=10 Hz

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Calls & Controls

4.5

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Noise-canceling microphone

What it is: Built-in microphone reduces background noise during calls

When it matters: When you take calls in busy spaces and want your voice to stay clearer.

Importance: MEDIUM

Can be used as a headset

What it is: Shows whether the headphones can handle voice chat and calls in addition to normal audio playback.

When it matters: When one pair needs to cover music, calls, meetings, and gaming chat.

Importance: MEDIUM

Number of microphones

What it is: Total number of built-in microphones

When it matters: When call pickup quality and beamforming support matter to you.

Importance: LOW

Good value: >=2

Boom microphone

What it is: Includes detachable boom microphone for voice clarity

When it matters: When you need stronger voice clarity for gaming, streaming, or work calls.

Importance: LOW

Microphone SNR

What it is: Signal-to-noise ratio of the microphone

When it matters: When call clarity matters and you want your voice picked up more cleanly instead of buried in background hiss.

Importance: LOW

Good value: >80 dB

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Connectivity

6.2

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Connectivity

What it is: Available connection methods (wired, wireless, Bluetooth, etc.)

When it matters: When the headphones need to match how you listen across wired and wireless devices.

Importance: HIGH

Bluetooth version

What it is: Version of Bluetooth technology supported

When it matters: When wireless stability, efficiency, and feature support matter more than treating Bluetooth as a box-check spec.

Importance: MEDIUM

Good value: >=5.0

N/A

Maximum Bluetooth range

What it is: Maximum wireless operating distance from source device

When it matters: When you move around rooms and want fewer dropouts from your source device.

Importance: LOW

Good value: >=10 m

N/A

Audio latency

What it is: Delay between audio and video in wireless mode

When it matters: When you watch video or play games and need sound to stay in sync.

Importance: HIGH

Good value: <60 ms

N/A

Multipoint support

What it is: Supports simultaneous connections to multiple devices

When it matters: When you switch often between a phone and a laptop during the day.

Importance: MEDIUM

N/A

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Features

4.1

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Ambient sound mode

What it is: Allows external sounds to pass through for awareness

When it matters: When you need to stay aware of traffic, voices, or announcements.

Importance: MEDIUM

N/A

EQ support

What it is: Allows customization of sound profile via equalizer

When it matters: When the stock tuning is not enough and you want to shape bass, mids, or treble to match your taste.

Importance: MEDIUM

Companion app

What it is: Dedicated mobile app for customization and updates

When it matters: When software customization, updates, and extra controls matter.

Importance: MEDIUM

N/A

Adjustable ANC levels

What it is: Allows adjustment of noise cancellation intensity levels

When it matters: When you move between quiet rooms, offices, streets, and public transport and do not want one ANC setting for every situation.

Importance: LOW

Good value: >=4

N/A

Voice assistant support

What it is: Compatible with voice assistants like Siri, Alexa, or Google Assistant

When it matters: When hands-free control is part of your daily routine.

Importance: LOW

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Battery

1.0

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Battery life

What it is: Playback time on a single charge

When it matters: When you commute, travel, or work long shifts and do not want charging breaks to interrupt listening.

Importance: HIGH

Good value: >45 hours

N/A

Battery life with ANC

What it is: Playback time with active noise cancellation enabled

When it matters: When you plan to keep noise cancellation on for most of the day.

Importance: HIGH

Good value: >40 hours

N/A

Charging time

What it is: Time required for a full battery charge

When it matters: When you often need the headphones ready again after short breaks.

Importance: MEDIUM

Good value: <=2 hours

N/A

Quick charge

What it is: Provides quick playback time with short charging period

When it matters: When a short top-up needs to deliver useful playback before you leave.

Importance: MEDIUM

N/A

Battery capacity

What it is: Total energy storage of the internal battery

When it matters: When you are estimating how much battery headroom the design may have before relying only on the official runtime claim.

Importance: MEDIUM

Good value: >=720 mAh

N/A

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Design

5.0

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Brand name

What it is: The manufacturer or brand of the product.

When it matters: When you prefer a specific ecosystem, support network, or design philosophy.

Importance: MEDIUM

AKG

Form factor

What it is: Overall design type of the headphones (over-ear, on-ear, in-ear, etc.)

When it matters: When comfort, portability, and isolation depend on the overall headphone style.

Importance: HIGH

over-ear

Weight

What it is: Total weight of the headphones

When it matters: When long listening sessions make wearing comfort more important.

Importance: MEDIUM

Good value: <150 g

Acoustic design

What it is: Type of acoustic design (open-back, closed-back, semi-open)

When it matters: When you need the right balance of isolation, leakage, and soundstage.

Importance: HIGH

closed-back

Clamp force

What it is: Amount of clamping pressure applied to the head

When it matters: When comfort and fit security matter during long sessions.

Importance: MEDIUM

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AKG K551 vs the average headphone

Why is AKG K551 better than the average headphone?

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10 mm larger driver size
AKG K551 uses a larger driver size than the average headphone (50 mm vs 40 mm). The average headphones use a driver size of 40 mm.
What it is: Diameter of the speaker driver unit
When it matters: When you want extra hardware context behind how the headphones may handle bass weight, scale, or overall presentation.
Importance: MEDIUM
AKG K551 uses a larger driver size than the average headphone (50 mm vs 40 mm). The average headphones use a driver size of 40 mm.50 mm vs 40 mm
12 dB/mW higher sensitivity
AKG K551 has a higher sensitivity than the average headphone (114 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
What it is: Sound pressure output level per unit of input power
When it matters: When you plan to use weaker sources like phones, handhelds, or entry-level dongles and still want enough volume.
Importance: MEDIUM
Good value: >=106 dB/mW
AKG K551 has a higher sensitivity than the average headphone (114 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.114 dB/mW vs 102 dB/mW
Direct 3.5 mm plug
AKG K551 includes a direct 3.5 mm plug, the average headphone does not. 38.8% of headphones have a 3.5 mm male connector.
What it is: Shows whether the headphones end in a built-in 3.5 mm male plug instead of relying on a separate detachable cable.
When it matters: When direct wired compatibility with older devices or adapters matters.
Importance: MEDIUM
AKG K551 includes a direct 3.5 mm plug, the average headphone does not. 38.8% of headphones have a 3.5 mm male connector.
In-line controls
AKG K551 includes in-line controls, the average headphone does not. 36.4% of headphones support in-line controls.
What it is: Controls available on in-line remote of wired cable
When it matters: When your wired setup depends on cable-mounted buttons or call controls.
Importance: LOW
AKG K551 includes in-line controls, the average headphone does not. 36.4% of headphones support in-line controls.
6 Hz lower bass extension
AKG K551 has a lower lowest frequency than the average headphone (12 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
What it is: Lowest audio frequency the headphones can reproduce
When it matters: When deeper bass extension matters for your music or movie listening.
Importance: MEDIUM
Good value: <=10 Hz
AKG K551 has a lower lowest frequency than the average headphone (12 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.12 Hz vs 18 Hz
8,000 Hz higher treble extension
AKG K551 has a higher highest frequency than the average headphone (28,000 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.
What it is: Highest audio frequency the headphones can reproduce
When it matters: When treble extension and overall frequency reach matter to you.
Importance: MEDIUM
Good value: >=24000 Hz
AKG K551 has a higher highest frequency than the average headphone (28,000 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.28000 Hz vs 20000 Hz
0.2 % lower distortion
AKG K551 has a lower total harmonic distortion than the average headphone (0.1 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.
What it is: Percentage of harmonic distortion in audio output
When it matters: When cleaner sound reproduction matters at louder volumes.
Importance: LOW
Good value: <=1%
AKG K551 has a lower total harmonic distortion than the average headphone (0.1 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.0.1 % vs 0.3 %
7 mm more spacious earcup width
AKG K551 offers more spacious earcup width than the average headphone (50 mm vs 43 mm). The average headphones offer an inner earcup width of 43 mm.
What it is: Internal width of the earcup cavity
When it matters: When earcup fit affects comfort and pressure around your ears.
Importance: MEDIUM
AKG K551 offers more spacious earcup width than the average headphone (50 mm vs 43 mm). The average headphones offer an inner earcup width of 43 mm.50 mm vs 43 mm
7 mm more spacious earcup width
AKG K551 offers more spacious earcup width than the average headphone (50 mm vs 43 mm). The average headphones offer an inner earcup width of 43 mm.
10 mm larger driver size
AKG K551 uses a larger driver size than the average headphone (50 mm vs 40 mm). The average headphones use a driver size of 40 mm.
12 dB/mW higher sensitivity
AKG K551 has a higher sensitivity than the average headphone (114 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
6 Hz lower bass extension
AKG K551 has a lower lowest frequency than the average headphone (12 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
8,000 Hz higher treble extension
AKG K551 has a higher highest frequency than the average headphone (28,000 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.
0.2 % lower distortion
AKG K551 has a lower total harmonic distortion than the average headphone (0.1 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.
11 dB SPL higher sound pressure level
AKG K551 has a higher sound pressure level than the average headphone (114 dB SPL vs 103 dB SPL). The average headphones reach a sound pressure level of 103 dB SPL.
Direct 3.5 mm plug
AKG K551 includes a direct 3.5 mm plug, the average headphone does not. 38.8% of headphones have a 3.5 mm male connector.
In-line controls
AKG K551 includes in-line controls, the average headphone does not. 36.4% of headphones support in-line controls.

Calls & Controls

Why is AKG K551 worse than the average headphone?

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39.9% higher weight
AKG K551 is heavier than the average headphone (305 g vs 218 g). The average pair of headphones weighs 218 g.
Fixed cable
AKG K551 has a fixed cable, while the average headphone has a detachable one. 62% of headphones have a detachable cable.
7 mm tighter earcup height
AKG K551 has tighter earcup height than the average headphone (53 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.
Tangle-prone cable
AKG K551 uses a tangle-prone cable, while the average headphone is easier to manage. 64.2% of headphones use a tangle-free cable.
No travel bag
AKG K551 does not include a travel bag, the average headphone does. 65.2% of headphones include a travel bag.
5 years older release date
AKG K551 was released earlier than the average headphone (2,012 vs 2,017). The average headphones were released in 2,017.
October 2012
39.9% higher weight
AKG K551 is heavier than the average headphone (305 g vs 218 g). The average pair of headphones weighs 218 g.
What it is: Total weight of the headphones
When it matters: When long listening sessions make wearing comfort more important.
Importance: MEDIUM
Good value: <150 g
AKG K551 is heavier than the average headphone (305 g vs 218 g). The average pair of headphones weighs 218 g.305 g vs 218 g
Fixed cable
AKG K551 has a fixed cable, while the average headphone has a detachable one. 62% of headphones have a detachable cable.
What it is: Cable can be removed or replaced
When it matters: When you care about easier cable replacement, simpler storage, or the option to swap to shorter, longer, or upgraded leads.
Importance: MEDIUM
AKG K551 has a fixed cable, while the average headphone has a detachable one. 62% of headphones have a detachable cable.
7 mm tighter earcup height
AKG K551 has tighter earcup height than the average headphone (53 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.
What it is: Internal height of the earcup cavity
When it matters: When larger ears need enough space inside the earcups.
Importance: MEDIUM
AKG K551 has tighter earcup height than the average headphone (53 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.53 mm vs 60 mm
Tangle-prone cable
AKG K551 uses a tangle-prone cable, while the average headphone is easier to manage. 64.2% of headphones use a tangle-free cable.
What it is: Cable designed to resist tangling
When it matters: When you often carry wired headphones in a bag or pocket.
Importance: LOW
AKG K551 uses a tangle-prone cable, while the average headphone is easier to manage. 64.2% of headphones use a tangle-free cable.
No travel bag
AKG K551 does not include a travel bag, the average headphone does. 65.2% of headphones include a travel bag.
What it is: Comes with a protective carrying case or pouch
When it matters: When protection in transit matters right out of the box.
Importance: LOW
AKG K551 does not include a travel bag, the average headphone does. 65.2% of headphones include a travel bag.
24.6% lower user score
AKG K551 has a lower user score than the average headphone (6.42 vs 8.000).
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.
AKG K551 has a lower user score than the average headphone (6.42 vs 8.000).6.42 vs 8
2x more expensive
AKG K551 is more expensive than the average headphone (£180 vs £90).
AKG K551 is more expensive than the average headphone (£180 vs £90).£180 vs £90
5 years older release date
AKG K551 was released earlier than the average headphone (2,012 vs 2,017). The average headphones were released in 2,017.
October 2012
What it is: Official release or launch date of the model
When it matters: When you want a newer model for fresher features, longer support life, or simply to avoid buying into an older generation.
Importance: LOW
Good value: >=2020
AKG K551 was released earlier than the average headphone (2,012 vs 2,017). The average headphones were released in 2,017.2012 vs 2017

Graphic comparison of AKG K551 and

Attribute category

Attribute

No results found

Third-party reviews

United Kingdom

United States

(Reviews last updated: June 2026)

What customers like about AKG K551?

Durable, premium build quality featuring metal components
Highly comfortable for long listening sessions with soft padding
Surprisingly wide and 'airy' soundstage for a closed-back design
Neutral and detailed sound profile well-suited for classical and acoustic music
Includes an integrated 3-button remote and mic for mobile use
Efficient and easy to drive from mobile devices due to 32-ohm impedance
Fold-flat earcups improve portability

What customers dislike about AKG K551?

Noticeable lack of bass impact, which can feel 'thin' or 'bland'
Large and bulky physical design can look 'ridiculous' for public use
In-line remote functionality is primarily optimized for Apple devices and may not work on Android
Relies heavily on a perfect ear cup seal; glasses or a poor fit can further reduce bass
Does not include a carrying case or a 1/4-inch adapter
Fixed, non-detachable cable makes replacement difficult if damaged
Passive isolation may struggle to block out low-frequency noise in loud environments

Expert reviews

diyaudioheaven.wordpress.com

05/12/2013

K551 | DIY-Audio-Heaven

The AKG K551 is a lightweight, closed-back, over-ear headphone designed for portable use and home studio monitoring. It features a 50mm dynamic driver, an integrated inline microphone and remote control optimized for Apple devices, and a 1.2-meter fixed cable. Notable strengths include immense bass extension reaching down to 5Hz, decent noise isolation, low weight, and high...Read more

head-fi.org

12/11/2012

AKG K551 - Reviews - Head-Fi Are you looking for more technical specifications or comparisons between the AKG K551 and its sibling, the K550Go to prod...

The AKG K551 is characterized as a high-performance headphone with an exceptionally detailed, forward midrange that offers a wide soundstage, great spatial imaging, and superior detail extraction compared to similar models like the Sennheiser HD 598. While praised for its acoustic performance, the headphone presents a heavily colored sound signature rather than a neutral, analytical...Read more

ilounge.com

14/05/2021

Review: AKG K551 Reference-Class Over-Ear Headphones With In-Line Microphone

The AKG K551 over-ear headphones are a high-end, Apple-focused model that balances strong physical comfort with major technical drawbacks. On the positive side, these headphones feature a modern, lightweight design with large 50mm drivers housed in comfortable aluminum, plastic, and leather ear cups. The ear cups conveniently rotate inward to lay flat for easier packing, and the...Read more

digit.in

01/08/2023

AKG K551 Review - Digit

The AKG K551, as reviewed by Digit, is a closed-back headphone featuring massive, comfortable earcups and a sturdy build designed for an exceptionally open, airy, and precise soundstage. The device provides an analytical, true-to-source audio experience that shines for purists, while its design includes a single-axis mechanism for laying flat. However, the review notes the...Read more

totallydubbed.net

25/07/2013

Review of the AKG K551 Headphones – Neutral and Smooth Sounding

The AKG K551 over-ear headphones are reviewed by Totally Dubbed as an exceptionally priced, high-value option (£150 at the time) that delivers a flat, analytical, and highly neutral sonic profile. The reviewer notes several core pros, including outstanding headphone build quality with a highly flexible headband, precise laser annotations on the ear cups, a lightweight and generally...Read more

cnet.com

15/07/2013

AKG K551 headphones review: These 'phones should've stayed at home

The AKG K551 headphones are designed as a portable version of the K550 model, adding a 3.6-foot cable with a three-button inline remote for mobile use. On the positive side, they offer excellent, sturdy build quality and a highly comfortable fit featuring soft, padded earcups and a padded headband. Sonically, they deliver a well-balanced, open, and airy soundstage that lacks a...Read more

geardiary.com

01/02/2013

AKG K551 Over-the-Ear Headphone Review - Gear Diary

The Gear Diary review of the AKG K551 highlights these over-ear, closed-back headphones as a high-end audio solution optimized for Apple devices, praising their exceptional comfort and ability to be worn for extended periods. Sound quality is a major highlight, with the review noting they provide great audio for music, audiobooks, and television viewing on an iPad, along with a...Read more

whathifi.com

23/01/2013

AKG K551 review - What Hi-Fi?

The AKG K551 over-ear, closed-back headphones are designed as a portable version of the award-winning K550 model, adding an inline remote, a shortened cable, and a carry pouch. What Hi-Fi? highly praises their sound quality, awarding them a five-star verdict for their expertly balanced, spacious, and highly detailed audio performance that spans comfortably across all musical genres....Read more

welt.de

29/06/2026

Results: 14 over-ear headphones reviewed", "Test results: 14 over-ear headphones

The WELT product review gallery summarizes an Audio Video Foto Bild test of 14 over-ear and on-ear headphones, divided into €200 and €100 price tiers. In the premium €200 category, the compact B&W P3 claimed first place due to its elegant, foldable build and warm, comfortable sound profile tailored for long listening sessions, though it sacrificed some soundstage spaciousness. The...Read more

kopfhoererimtest.de

01/04/2014

AKG K551 Review (Part 1/2)", "AKG K551 on Test (1/2)

The AKG K551 is a large, premium over-ear headphone featuring 11-centimeter earcups and 50-mm drivers designed to deliver an airy and open soundstage with highly accurate mid-range frequencies. As the portable, upgraded sibling of the home-oriented AKG K550, it features a shorter cable and an integrated iOS-compatible inline remote control with a microphone for mobile calls. Despite...Read more

avguide.ch

16/03/2013

Review of eight really good headphones (including AKG K551)

The AKG K845 BT over-ear headphones are a dynamic, 32-Ohm model noted as the only Bluetooth-capable entry in this multi-product test. On the positive side, they feature a clever one-point ear cup suspension that allows them to rotate 90 degrees flat for easy desktop storage, along with practical, large "L" and "R" labels printed directly onto the inner fabric. The right cup houses...Read more

connect.de

05/02/2013

Hi-Fi Headphones: AKG K 551 Review

The connect review of the AKG K 551 highlights its excellent physical construction and outstanding user comfort. The pros emphasized in the test include a beautiful aluminum finish and a highly flexible headband equipped with soft padding and a 12-stage adjustment mechanism, making the large headphones feel surprisingly lightweight. Its massive 50mm ear cushions completely surround...Read more

lesnumeriques.com

14/03/2013

K551 Review: A Reference Headphone

The Les Numériques review awards the AKG K551 a perfect 5 out of 5 stars, praising it as a high-end, closed-back reference headphone designed for portable use. The core pros centered around its outstanding audio fidelity, which mirrors the highly-regarded, neutral signature of the AKG K701. Thanks to its massive 50mm transducers, it provides an exceptionally wide soundstage and...Read more

audiocasque.fr

12/03/2014

AKG K551: Full Review | Headphones for the Audiophile on the Move

The AKG K551 is a solid, comfortable audio headset meant for people who love clean sound while traveling. It has very large ear cups that fit around your ears and block out outside noise well. The sound is clear and detailed, especially for high notes, classical music, and acoustic songs. It also creates a wide, open stage feel that makes you feel like you are at a live concert....Read more

draadbreuk.nl

20/11/2014

Here we go: Paul challenges headphone manufacturers!

Based on the provided review from Draadbreuk.nl, here is a specific summary detailing the reviewer's experiences with the featured headphones: Review Summary The reviewer, Paul Gersen, evaluates high-end headphones through the lens of a heavy-use professional pop journalist who demands both stellar audio quality and structural durability. He highlights several premium models that...Read more

Video reviews

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