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  1. Home
  2. Headphones
  3. Compare
  1. Table of Contents
  2. Top
  3. Main Differences
  4. Design
    1. Style
    2. Comfort
    3. Controls
    4. Breathability
    5. Portability
    6. Case
    7. Build Quality
    8. Stability
    9. Headshots 1
    10. Headshots 2
    11. Top
    12. In The Box
  5. Sound
    1. Sound Profile
    2. Frequency Response Consistency
    3. Raw Frequency Response
    4. Bass Profile: Target Compliance
    5. Mid-Range Profile: Target Compliance
    6. Treble Profile: Target Compliance
    7. Peaks/Dips
    8. Imaging
    9. Passive Soundstage
    10. Virtual Soundstage
    11. Weighted Harmonic Distortion
    12. Test Settings
  6. Isolation
    1. Noise Isolation - Full Range
    2. Noise Isolation - Common Scenarios
    3. Noise Isolation - Voice Handling
    4. ANC Wind Handling
    5. Leakage
  7. Microphone
    1. Microphone Style
    2. Recording Quality
    3. Noise Handling
  8. Active Features
    1. Battery
    2. App Support
  9. Connectivity
    1. Wired Connection
    2. Bluetooth Connection
    3. Wireless Connection (Dongle)
    4. PC Compatibility
    5. PlayStation Compatibility
    6. Xbox Compatibility
    7. Base/Dock
  10. Comments

Superlux HD 681 vs AKG K240 MKII

Side-by-Side Comparison

Products

Superlux HD 681
AKG K240 MKII

Tested using Methodology v1.8

Updated Dec 09, 2024 07:16 PM

SEE PRICE
Amazon.com

Tested using Methodology v1.5

Updated Apr 26, 2022 08:59 PM

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Amazon.com
Superlux HD 681 Picture
AKG K240 MKII Picture
TypeOver-ear
Noise CancellingNo
EnclosureSemi-Open
WirelessNo
TransducerDynamic
MicNo
TypeOver-ear
Noise CancellingNo
EnclosureSemi-Open
WirelessNo
TransducerDynamic
MicNo
  1. Recommended in 2 articles:
  2. Open-Back
  3. Under $50

Variants

  • HD 681
  • K240 MKII

Review

See Superlux HD 681 Review
See AKG K240 MKII Review
0 
0 

Our Verdict

Superlux HD 681

AKG K240 MKII

The Superlux HD 681 and the AKG K240 MKII are similarly designed headphones with similar levels of comfort. The Superlux have a brighter sound profile overall, with a touch more low-end. They also come with a carrying pouch.

0 

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Standard
HD 681
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Standard
K240 MKII
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Standard
HD 681
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Standard
K240 MKII
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Standard
HD 681
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Standard
K240 MKII
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Standard
HD 681
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Standard
K240 MKII
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HD 681
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K240 MKII
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Main Differences for
Neutral Sound

Threshold 

0.10

Neutral Sound 

7.9
7.5

Bass Profile: Target Compliance 
 

7.4
6.4

Mid-Range Profile: Target Compliance 
 

9.1
8.5

Full Comparison

Design

Style  

Design Picture 2  

Superlux HD 681 Design Picture 2
AKG K240 MKII Design Picture 2

Type  

Over-ear
Over-ear

Enclosure  

Semi-Open
Semi-Open

Wireless  

No
No

Transducer  

Dynamic
Dynamic
Show Text 

Comfort 
 

7.5
7.5

Comfort Picture  

Superlux HD 681 Comfort Picture
AKG K240 MKII Comfort Picture

Weight  

0.5 lbs
0.53 lbs

Clamping Force 
 

0.9 lbs
0.7 lbs
Show Text 

Controls 
 

0.0
0.0

Controls Picture  

Superlux HD 681 Controls Picture
AKG K240 MKII Controls Picture

OS Compatibility 
 

No Controls
No Controls

Ease Of Use  

No Controls
No Controls

Feedback  

No Controls
No Controls

Call/Music Control  

No
No

Volume Control  

No
No

Microphone Control  

No
No

Channel Mixing 
 

No
No

Noise Cancelling Control  

No
No

Talk-Through 
 

No
No

Additional Controls  

No
No

Breathability 
 

6.8
7.0

Breathability After Picture  

Superlux HD 681 Breathability After Picture
AKG K240 MKII Breathability After Picture

Avg.Temp.Difference  

4.8 °C
4.3 °C
Show Text 

Portability 
 

5.4
5.1

Portability Picture  

Superlux HD 681 Portability Picture
AKG K240 MKII Portability Picture

L  

8.0" (20.3 cm)
9.0" (22.9 cm)

W  

7.2" (18.3 cm)
7.1" (18.1 cm)

H  

3.5" (8.9 cm)
4.1" (10.5 cm)

Volume  

201.00 in³ (3,293.79 cm³)
265.00 in³ (4,342.55 cm³)

Transmitter Required  

No
No
Show Text 

Case 
 

5.5
0.0

Case Picture  

Superlux HD 681 Case Picture
AKG K240 MKII Case Picture

Type  

No case
No case

L  

N/A
N/A

W  

N/A
N/A

H  

N/A
N/A

Volume  

N/A
N/A
Show Text 

Build Quality 
 

5.5
6.0

Build Quality Picture  

Superlux HD 681 Build Quality Picture
AKG K240 MKII Build Quality Picture
Show Text 

Stability 
 

6.0
5.0

Stability Picture  

Superlux HD 681 Stability Picture
AKG K240 MKII Stability Picture
Show Text 

Headshots 1  

Angled Picture  

Superlux HD 681 Angled Picture
AKG K240 MKII Angled Picture

Side Picture  

Superlux HD 681 Side Picture
AKG K240 MKII Side Picture

Headshots 2  

Front Picture  

Superlux HD 681 Front Picture
AKG K240 MKII Front Picture

Rear Picture  

Superlux HD 681 Rear Picture
AKG K240 MKII Rear Picture

Top  

Top Picture  

Superlux HD 681 Top Picture
AKG K240 MKII Top Picture

In The Box  

In The Box Picture  

Superlux HD 681 In The Box Picture
AKG K240 MKII In The Box Picture
Show Text 
Sound

Sound Profile 
 

Sound Profile  

See details on graph tool
See details on graph tool

Normalization Frequency 
 

1,500 Hz

Bass Amount 
 

-4.2 dB
-5.08 dB

Treble Amount 
 

1.6 dB
-2.89 dB
Show Text 

Frequency Response Consistency 
 

7.8
6.9

Consistency L  

See details on graph tool
See details on graph tool

Consistency R  

See details on graph tool
See details on graph tool

Avg. Std. Deviation 
 

0.44 dB
0.65 dB
Show Text 

Raw Frequency Response 
 

Raw FR L  

See details on graph tool
See details on graph tool

Raw FR R  

See details on graph tool
See details on graph tool

Bass Profile: Target Compliance 
 

7.4
6.4

Bass Profile: Target Compliance  

See details on graph tool
See details on graph tool

RMS Deviation From Target 
 

5.5 dB
5.4 dB

Low-Frequency Extension 
 

27.29 Hz
71.27 Hz

Low Bass 
 

-7.23 dB
-10.52 dB

Mid Bass 
 

-2.34 dB
-1.6 dB

High Bass 
 

-1.53 dB
3.25 dB
Show Text 

Mid-Range Profile: Target Compliance 
 

9.1
8.5

Mid-Range Profile: Target Compliance  

See details on graph tool
See details on graph tool

RMS Deviation From Target 
 

1.01 dB
2.05 dB

Low Mid 
 

-1.12 dB
2.4 dB

Mid-Mid 
 

-0.96 dB
-0.01 dB

High Mid 
 

0.38 dB
-2.06 dB
Show Text 

Treble Profile: Target Compliance 
 

6.9
7.4

Treble Profile: Target Compliance  

See details on graph tool
See details on graph tool

RMS Deviation From Target 
 

3.39 dB
3.94 dB

Low Treble 
 

-0.24 dB
-2.16 dB

Mid Treble 
 

4.05 dB
-0.52 dB

High Treble 
 

-1.81 dB
-9.55 dB
Show Text 

Peaks/Dips 
 

7.7
7.1

Peaks/Dips Graph 
 

See details on graph tool
See details on graph tool

Peaks 
 

1.1 dB
2.06 dB

Dips 
 

2.39 dB
1.08 dB
Show Text 

Imaging 
 

8.1
8.5

Group Delay  

See details on graph tool
See details on graph tool

Phase Response Mismatch  

See details on graph tool
See details on graph tool

Weighted Group Delay 
 

0.26
0.24

Weighted Phase Mismatch 
 

12.02
8.81

Weighted Amplitude Mismatch 
 

0.76
0.49

Weighted Frequency Mismatch 
 

1.71
1.76
Show Text 

Passive Soundstage 
 

7.8
8.0

PRTF  

See details on graph tool
See details on graph tool

PRTF Accuracy (Std. Dev.) 
 

1.58 dB
4.09 dB

PRTF Size (Avg.) 
 

6.36 dB
4.54 dB

PRTF Distance 
 

11.68 dB
15.14 dB

Openness 
 

9.2
9.4

Acoustic Space Excitation 
 

6.7
7.3
Show Text 

Virtual Soundstage 
 

0.0
0.0

Virtual Soundstage  

Superlux HD 681 Virtual Soundstage
AKG K240 MKII Virtual Soundstage

Head Modeling 
 

No
No

Speaker Modeling 
 

No
No

Room Ambience 
 

No
No

Head Tracking 
 

No
No

Virtual Surround 
 

No App
No App

Weighted Harmonic Distortion 
 

7.6
6.7

Weighted Harmonic Distortion  

See details on graph tool
See details on graph tool

WHD @ 90 
 

0.145
0.212

WHD @ 100 
 

0.313
0.887
Show Text 

Test Settings 
 

Firmware 
 

No Firmware
No Firmware

Power 
 

Passive
Passive

Connection 
 

Wired
Wired

Codec 
 

PCM, 24-bit, 48kHz
PCM, 24-bit, 48kHz

Test Instrument  

Audio Precision APx517B

EQ 
 

No EQ
No EQ

ANC 
 

No ANC
No ANC

Tip/Pad 
 

Default
Default

Microphone 
 

No Microphone
No Microphone
Show Text 
Isolation

Noise Isolation - Full Range 
 

2.6
1.4

Noise Isolation - Full Range Graph  

See details on graph tool
See details on graph tool

Noise Cancelling  

No
No

Overall Attenuation 
 

-5.95 dB
-3.84 dB

Isolation Audio 
 

Bass 
 

0.18 dB
0.13 dB

Mid 
 

-0.14 dB
1.38 dB

Treble 
 

-19.85 dB
-12.66 dB
Show Text 

Noise Isolation - Common Scenarios 
 

2.8

Noise Isolation - Common Scenarios Graph  

See details on graph tool

Airplane Noise Attenuation 
 

-5.04 dB

Airplane Noise Isolation Audio 
 

Office Noise Attenuation 
 

-5.31 dB

Office Noise Isolation Audio 
 

Street Noise Attenuation 
 

-5.59 dB

Street Noise Isolation Audio 
 

Show Text 

Noise Isolation - Voice Handling 
 

Female Voice 1 
 

Male Voice 1 
 

Female Voice 2 
 

Male Voice 2 
 

ANC Wind Handling 
 

ANC Wind Handling Graph  

Superlux HD 681 ANC Wind Handling Graph

ANC Wind Noise 
 

N/A

Leakage 
 

4.3
3.7

Leakage  

See details on graph tool
See details on graph tool

Leakage Audio 
 

Overall Leakage @ 1ft 
 

52.9 dB
55.29 dB
Show Text 
Microphone

Microphone Style 
 

Integrated 
 

No
No

In-Line 
 

No
No

Boom 
 

No
No

Detachable Boom 
 

No
No

Mic  

No
No

Recording Quality 
 

0.0
0.0

Microphone Frequency Response  

Superlux HD 681 Microphone Frequency Response
AKG K240 MKII Microphone Frequency Response

Recorded Speech 
 

N/A
N/A

LFE 
 

N/A
N/A

FR Std. Dev. 
 

N/A
N/A

HFE 
 

N/A
N/A

Weighted THD 
 

N/A
N/A

Gain 
 

N/A
N/A

Noise Handling 
 

0.0
0.0

SpNR  

Superlux HD 681 SpNR
AKG K240 MKII SpNR

SpNR 
 

N/A
N/A

Noise Gate 
 

No
No

Speech + Pink Noise Handling 
 

N/A
N/A

Speech + Pink Noise Audio Sample  

N/A
N/A

Speech + Subway Noise Handling 
 

N/A
N/A

Speech + Subway Noise Audio Sample  

N/A
N/A
Active Features

Battery 
 

0.0
0.0

Battery Type 
 

No Battery
No Battery

Continuous Battery Life 
 

N/A
N/A

Additional Charges 
 

N/A
N/A

Total Battery Life 
 

N/A
N/A

Charge Time 
 

N/A
N/A

Power-Saving Feature 
 

No
No

Audio While Charging 
 

No
No

Passive Playback 
 

Passive Headphone
Passive Headphone

Charging Port  

None
None

App Support 
 

0.0
0.0

App Picture  

Superlux HD 681 App Picture
AKG K240 MKII App Picture

App Name  

No App
No App

iOS  

No
No

Android  

No
No

macOS  

No
No

Windows  

No
No

Equalizer 
 

No
No

ANC Control 
 

No
No

Mic Control  

No
No

Room Effects 
 

No
No

Playback Control 
 

No
No

Button Mapping  

No
No

Surround Support 
 

No
No
Show Text 
Connectivity

Wired Connection 
 

9.1
9.5

Cable Picture  

Superlux HD 681 Cable Picture
AKG K240 MKII Cable Picture

Analog Audio 
 

Yes
Yes

USB Audio 
 

No
No

Detachable 
 

No
Yes

Length 
 

8.00 ft (2.44 m)
9.45 ft (2.88 m)

Connector 
 

1/8" TRS
1/8" TRS

Latency - Analog 
 

0.2 ms

Latency - USB 
 

N/A
0 ms

Recorded Latency 
 

Recorded Latency Connection  

Analog
Show Text 

Bluetooth Connection 
 

0.0
0.0

Bluetooth Version 
 

No Bluetooth
No Bluetooth

Multi-Device Pairing 
 

No
No

NFC Pairing 
 

No

Quick Pair (Android) 
 

No

Quick Pair (iOS) 
 

No

Line Of Sight Range 
 

N/A
N/A

Latency - SBC 
 

N/A
N/A

Latency - aptX 
 

N/A
N/A

Latency - aptX Adaptive (High Quality) 
 

N/A

Latency - aptX Adaptive (Low Latency) 
 

N/A

Latency - LDAC 
 

N/A

Recorded Latency 
 

N/A

Recorded Latency Codec  

No Bluetooth Audio

AAC Support 
 

No

PC Latency (aptX HD) 
 

N/A

PC Latency (aptX-LL) 
 

N/A

iOS Latency 
 

N/A

Android Latency 
 

N/A

Wireless Connection (Dongle) 
 

0.0
0.0

Line Of Sight Range 
 

N/A
N/A

Latency - Dongle 
 

N/A
N/A

Recorded Latency 
 

N/A

PC Compatibility 
 

Analog 
 

Audio Only
Audio Only

Wired USB 
 

No
No

Non-BT Wireless 
 

No
No
Show Text 

PlayStation Compatibility 
 

PS4 Analog 
 

Audio Only
Audio Only

PS4 Wired USB 
 

No
No

PS4 Non-BT Wireless 
 

No
No

PS5 Analog 
 

Audio Only
Audio Only

PS5 Wired USB 
 

No
No

PS5 Non-BT Wireless 
 

No
No
Show Text 

Xbox Compatibility 
 

Xbox One Analog 
 

Audio Only
Audio Only

Xbox One Wired USB 
 

No
No

Xbox One Non-BT Wireless 
 

No
No

Xbox Series X|S Analog 
 

Audio Only
Audio Only

Xbox Series X|S Wired USB 
 

No
No

Xbox Series X|S Non-BT Wireless 
 

No
No
Show Text 

Base/Dock 
 

0.0
0.0

Type 
 

No Base/Dock
No Base/Dock

USB Input 
 

No
No

Line In 
 

No
No

Line Out 
 

No
No

Optical Input 
 

No
No

RCA Input 
 

No
No

Dock Charging 
 

No
No

Power Supply 
 

No Base/Dock
No Base/Dock

Check Price

Standard
HD 681
Searching
Finding store
Standard
K240 MKII
Searching
Finding store
Standard
HD 681
Searching
Finding store
Standard
K240 MKII
Searching
Finding store
Standard
HD 681
Searching
Finding store
Standard
K240 MKII
Searching
Finding store
Standard
HD 681
Searching
Finding store
Standard
K240 MKII
Searching
Finding store
Standard
HD 681
Searching
Finding store
Standard
K240 MKII
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Finding store
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Superlux HD 681

AKG K240 MKII

Comments

  1. Comparison
 • Posted 1 year ago

AKG K240 MKII vs Superlux HD 681: Main Discussion

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