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  1. Home
  2. Headphones
  3. Compare

Sennheiser HD 6XX vs HiFiMan Sundara 2020

Which Headphones Are Better?

    Top
    Main Differences
    Sound
      Sound ProfileFrequency Response ConsistencyRaw Frequency ResponseBass Profile: Target ComplianceMid-Range Profile: Target ComplianceTreble Profile: Target CompliancePeaks/DipsStereo MismatchCumulative Spectral DecayPRTFHarmonic DistortionElectrical AspectsVirtual SoundstageTest Settings
    Design
      StyleComfortControlsPortabilityCaseBuild QualityStabilityHeadshots 1Headshots 2TopIn The Box
    Isolation
      Noise Isolation - Full RangeNoise Isolation - Common ScenariosNoise Isolation - Voice HandlingANC Wind HandlingLeakage
    Microphone
      Microphone StyleRecording QualityNoise Handling
    Active Features
      BatteryApp Support
    Connectivity
      Wired ConnectionBluetooth ConnectionWireless Connection (Dongle)PC CompatibilityPlayStation CompatibilityXbox CompatibilityBase/Dock
    Comments

Products

Sennheiser HD 6XX
HiFiMan Sundara 2020

Tested using Methodology v2.1

Updated Mar 09, 2026 05:39 PM

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Tested using Methodology v2.1

Updated Mar 09, 2026 11:37 AM

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Sennheiser HD 6XX Picture

Track

HiFiMan Sundara 2020 Picture

Track

TypeOver-ear
Noise CancellingNo
EnclosureOpen-Back
Bass Amount
Underemphasized (-4 dB)
WirelessNo
Treble Amount
Balanced (-1 dB)
MicNo
Sound Signature
Flat
TypeOver-ear
Noise CancellingNo
EnclosureOpen-Back
Bass Amount
Slightly Underemphasized (-3 dB)
WirelessNo
Treble Amount
Slightly Underemphasized (-2 dB)
MicNo
Sound Signature
Flat

Our Verdict

Sennheiser HD 6XX

HiFiMan Sundara 2020

The HiFiMan Sundara 2020 and the Sennheiser HD 6XX are both open-backs with flat sound profiles, but the HiFiMan are able to reproduce treble a bit more evenly, and they're a bit less plasticky. They're also more comfortable, and don't need an amp. However, you may prefer the Sennheiser's tuning and slightly more stable fit.

0 

Variants

  • HD 6XX (Midnight Blue)
  • Sundara 2020 (Black)

Review

See Sennheiser HD 6XX Review
See HiFiMan Sundara 2020 Review
2 
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Check Price

Midnight Blue
HD 6XX
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Black
Sundara 2020
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Midnight Blue
HD 6XX
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Black
Sundara 2020
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B&H
Midnight Blue
HD 6XX
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Black
Sundara 2020
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Midnight Blue
HD 6XX
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Sennheiser
Black
Sundara 2020
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HiFiMan
Midnight Blue
HD 6XX
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Black
Sundara 2020
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Main Differences for
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Full Comparison

Sound

Sound Profile 
 

Sound Profile  

Sennheiser HD 6XX Sound Profile Sample

SAMPLE

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HiFiMan Sundara 2020 Sound Profile Sample

SAMPLE

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Normalization Frequency 
 

Lock Hz
Lock Hz

Bass Amount 
 

Locked
Locked

Treble Amount 
 

Locked
Locked

Sound Signature 
 

Locked
Locked
Show Text 

Frequency Response Consistency 
 

N/A
N/A

Consistency L  

Sennheiser HD 6XX Consistency L Sample

SAMPLE

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HiFiMan Sundara 2020 Consistency L Sample

SAMPLE

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Consistency R  

Sennheiser HD 6XX Consistency R Sample

SAMPLE

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HiFiMan Sundara 2020 Consistency R Sample

SAMPLE

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Std. Deviation 
 

Lock dB
Lock dB
Show Text 

Raw Frequency Response 
 

Raw FR L  

Sennheiser HD 6XX Raw FR L Sample

SAMPLE

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HiFiMan Sundara 2020 Raw FR L Sample

SAMPLE

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Raw FR R  

Sennheiser HD 6XX Raw FR R Sample

SAMPLE

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HiFiMan Sundara 2020 Raw FR R Sample

SAMPLE

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Bass Profile: Target Compliance 
 

N/A
N/A

Bass Profile: Target Compliance  

Sennheiser HD 6XX Bass Profile: Target Compliance Sample

SAMPLE

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HiFiMan Sundara 2020 Bass Profile: Target Compliance Sample

SAMPLE

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RMS Deviation From Target 
 

Lock dB
Lock dB

Low-Frequency Extension 
 

Lock Hz
Lock Hz

Low Bass 
 

Lock dB
Lock dB

Mid Bass 
 

Lock dB
Lock dB

High Bass 
 

Lock dB
Lock dB
Show Text 

Mid-Range Profile: Target Compliance 
 

N/A
N/A

Mid-Range Profile: Target Compliance  

Sennheiser HD 6XX Mid-Range Profile: Target Compliance Sample

SAMPLE

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HiFiMan Sundara 2020 Mid-Range Profile: Target Compliance Sample

SAMPLE

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RMS Deviation From Target 
 

Lock dB
Lock dB

Low Mid 
 

Lock dB
Lock dB

Mid-Mid 
 

Lock dB
Lock dB

High Mid 
 

Lock dB
Lock dB
Show Text 

Treble Profile: Target Compliance 
 

N/A
N/A

Treble Profile: Target Compliance  

Sennheiser HD 6XX Treble Profile: Target Compliance Sample

SAMPLE

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HiFiMan Sundara 2020 Treble Profile: Target Compliance Sample

SAMPLE

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RMS Deviation From Target 
 

Lock dB
Lock dB

Low Treble 
 

Lock dB
Lock dB

Mid Treble 
 

Lock dB
Lock dB

High Treble 
 

Lock dB
Lock dB
Show Text 

Peaks/Dips 
 

N/A
N/A

Peaks/Dips Graph 
 

Sennheiser HD 6XX Peaks/Dips Graph Sample

SAMPLE

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HiFiMan Sundara 2020 Peaks/Dips Graph Sample

SAMPLE

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Peaks 
 

Lock dB
Lock dB

Dips 
 

Lock dB
Lock dB
Show Text 

Stereo Mismatch 
 

N/A
N/A

Frequency Response Mismatch  

Sennheiser HD 6XX Frequency Response Mismatch Sample

SAMPLE

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HiFiMan Sundara 2020 Frequency Response Mismatch Sample

SAMPLE

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Phase Response Mismatch  

Sennheiser HD 6XX Phase Response Mismatch Sample

SAMPLE

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HiFiMan Sundara 2020 Phase Response Mismatch Sample

SAMPLE

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Weighted Amplitude Mismatch 
 

Lock dB
Lock dB

Weighted Frequency Response Mismatch 
 

Lock dB
Lock dB

Weighted Phase Mismatch 
 

Lock°
Lock°
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Cumulative Spectral Decay 
 

CSD  

Sennheiser HD 6XX CSD Sample

SAMPLE

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HiFiMan Sundara 2020 CSD Sample

SAMPLE

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PRTF 
 

N/A
N/A

PRTF  

Sennheiser HD 6XX PRTF Sample

SAMPLE

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HiFiMan Sundara 2020 PRTF Sample

SAMPLE

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PRTF Accuracy (RMS Deviation) 
 

Lock dB
Lock dB

PRTF Size (Avg.) 
 

Lock dB
Lock dB

PRTF Distance 
 

Lock dB
Lock dB
Show Text 

Harmonic Distortion 
 

N/A
N/A

Harmonics Levels  

Sennheiser HD 6XX Harmonics Levels Sample

SAMPLE

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HiFiMan Sundara 2020 Harmonics Levels Sample

SAMPLE

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THD Ratio  

Sennheiser HD 6XX THD Ratio Sample

SAMPLE

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HiFiMan Sundara 2020 THD Ratio Sample

SAMPLE

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WHD @ 94 dB SPL 
 

Lock%
Lock%

WHD @ 104 dB SPL 
 

Lock%
Lock%

Electrical Aspects 
 

Impedance  

Sennheiser HD 6XX Impedance Sample

SAMPLE

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HiFiMan Sundara 2020 Impedance Sample

SAMPLE

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Sensitivity @1kHz-1V 
 

Lock dB SPL
Lock dB SPL

Bluetooth Max SPL 
 

N/A
N/A
Show Text 

Virtual Soundstage 
 

N/A
N/A

Virtual Soundstage  

Sennheiser HD 6XX Virtual Soundstage Sample

SAMPLE

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HiFiMan Sundara 2020 Virtual Soundstage Sample

SAMPLE

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Head Modeling 
 

Locked
Locked

Speaker Modeling 
 

Locked
Locked

Room Ambience 
 

Locked
Locked

Head Tracking 
 

Locked
Locked

Virtual Surround 
 

Locked
Locked
Show Text 

Test Settings 
 

Firmware 
 

Locked
Locked

Power 
 

Locked
Locked

Connection 
 

Locked
Locked

Codec 
 

Locked
Locked

Test Instrument  

Locked
Locked

EQ 
 

Locked
Locked

ANC 
 

Locked
Locked

Tip/Pad 
 

Locked
Locked

Microphone 
 

Locked
Locked
Show Text 
Design

Style  

Design Picture 2  

Sennheiser HD 6XX Design Picture 2 Sample

SAMPLE

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HiFiMan Sundara 2020 Design Picture 2 Sample

SAMPLE

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Type  

Locked
Locked

Enclosure  

Locked
Locked

Wireless  

Locked
Locked

Transducer  

Locked
Locked
Show Text 

Comfort 
 

N/A
N/A

Comfort Picture  

Sennheiser HD 6XX Comfort Picture Sample

SAMPLE

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HiFiMan Sundara 2020 Comfort Picture Sample

SAMPLE

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Weight  

Lock lbs
Lock lbs

Clamping Force 
 

Lock lbs
Lock lbs
Show Text 

Controls 
 

N/A
N/A

Controls Picture  

Sennheiser HD 6XX Controls Picture Sample

SAMPLE

JOIN NOW

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HiFiMan Sundara 2020 Controls Picture Sample

SAMPLE

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OS Compatibility 
 

Locked
Locked

Ease Of Use  

Locked
Locked

Feedback  

Locked
Locked

Call/Music Control  

Locked
Locked

Volume Control  

Locked
Locked

Microphone Control  

Locked
Locked

Channel Mixing 
 

Locked
Locked

Noise Cancelling Control  

Locked
Locked

Talk-Through 
 

Locked
Locked

Additional Controls  

Locked
Locked
Show Text 

Portability 
 

N/A
N/A

Portability Picture  

Sennheiser HD 6XX Portability Picture Sample

SAMPLE

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HiFiMan Sundara 2020 Portability Picture Sample

SAMPLE

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L  

Lock" (Lock cm)
Lock" (Lock cm)

W  

Lock" (Lock cm)
Lock" (Lock cm)

H  

Lock" (Lock cm)
Lock" (Lock cm)

Volume  

Lock in³ (Lock cm³)
Lock in³ (Lock cm³)

Transmitter Required  

Locked
Locked
Show Text 

Case 
 

N/A
N/A

Case Picture  

Sennheiser HD 6XX Case Picture Sample

SAMPLE

JOIN NOW

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HiFiMan Sundara 2020 Case Picture Sample

SAMPLE

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Type  

Locked
Locked

L  

N/A
N/A

W  

N/A
N/A

H  

N/A
N/A

Volume  

N/A
N/A
Show Text 

Build Quality 
 

N/A
N/A

Build Quality Picture  

Sennheiser HD 6XX Build Quality Picture Sample

SAMPLE

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HiFiMan Sundara 2020 Build Quality Picture Sample

SAMPLE

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Show Text 

Stability 
 

N/A
N/A

Stability Picture  

Sennheiser HD 6XX Stability Picture Sample

SAMPLE

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HiFiMan Sundara 2020 Stability Picture Sample

SAMPLE

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Show Text 

Headshots 1  

Angled Picture  

Sennheiser HD 6XX Angled Picture Sample

SAMPLE

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HiFiMan Sundara 2020 Angled Picture Sample

SAMPLE

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Side Picture  

Sennheiser HD 6XX Side Picture Sample

SAMPLE

JOIN NOW

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HiFiMan Sundara 2020 Side Picture Sample

SAMPLE

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Headshots 2  

Front Picture  

Sennheiser HD 6XX Front Picture Sample

SAMPLE

JOIN NOW

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HiFiMan Sundara 2020 Front Picture Sample

SAMPLE

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Rear Picture  

Sennheiser HD 6XX Rear Picture Sample

SAMPLE

JOIN NOW

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HiFiMan Sundara 2020 Rear Picture Sample

SAMPLE

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Top  

Top Picture  

Sennheiser HD 6XX Top Picture Sample

SAMPLE

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HiFiMan Sundara 2020 Top Picture Sample

SAMPLE

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In The Box  

In The Box Picture  

Sennheiser HD 6XX In The Box Picture Sample

SAMPLE

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HiFiMan Sundara 2020 In The Box Picture Sample

SAMPLE

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Show Text 
Isolation

Noise Isolation - Full Range 
 

N/A
N/A

Noise Isolation - Full Range Graph  

Sennheiser HD 6XX Noise Isolation - Full Range Graph Sample

SAMPLE

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HiFiMan Sundara 2020 Noise Isolation - Full Range Graph Sample

SAMPLE

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Noise Cancelling  

Locked
Locked

Overall Attenuation 
 

Lock dB
Lock dB

Bass 
 

Lock dB
Lock dB

Mid 
 

Lock dB
Lock dB

Treble 
 

Lock dB
Lock dB
Show Text 

Noise Isolation - Common Scenarios 
 

N/A
N/A

Noise Isolation - Common Scenarios Graph  

Sennheiser HD 6XX Noise Isolation - Common Scenarios Graph Sample

SAMPLE

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HiFiMan Sundara 2020 Noise Isolation - Common Scenarios Graph Sample

SAMPLE

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Airplane Noise Attenuation 
 

Lock dB
Lock dB

Airplane Noise Isolation Audio 
 

JOIN NOW
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Office Noise Attenuation 
 

Lock dB
Lock dB

Office Noise Isolation Audio 
 

JOIN NOW
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Street Noise Attenuation 
 

Lock dB
Lock dB

Street Noise Isolation Audio 
 

JOIN NOW
JOIN NOW
Show Text 

Noise Isolation - Voice Handling 
 

Female Voice 1 
 

JOIN NOW
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Male Voice 1 
 

JOIN NOW
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Female Voice 2 
 

JOIN NOW
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Male Voice 2 
 

JOIN NOW
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ANC Wind Handling 
 

ANC Wind Handling Graph  

Sennheiser HD 6XX ANC Wind Handling Graph Sample

SAMPLE

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HiFiMan Sundara 2020 ANC Wind Handling Graph Sample

SAMPLE

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ANC Wind Noise 
 

JOIN NOW
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Leakage 
 

N/A
N/A

Leakage  

Sennheiser HD 6XX Leakage Sample

SAMPLE

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HiFiMan Sundara 2020 Leakage Sample

SAMPLE

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Leakage Audio 
 

JOIN NOW
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Overall Leakage @ 1ft 
 

Lock dB
Lock dB
Show Text 
Microphone

Microphone Style 
 

Integrated 
 

Locked
Locked

In-Line 
 

Locked
Locked

Boom 
 

Locked
Locked

Detachable Boom 
 

Locked
Locked

Mic  

Locked
Locked
Show Text 

Recording Quality 
 

N/A
N/A

Microphone Frequency Response  

Sennheiser HD 6XX Microphone Frequency Response Sample

SAMPLE

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HiFiMan Sundara 2020 Microphone Frequency Response Sample

SAMPLE

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Recorded Speech 
 

JOIN NOW
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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
Show Text 

Noise Handling 
 

N/A
N/A

SpNR  

Sennheiser HD 6XX SpNR Sample

SAMPLE

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HiFiMan Sundara 2020 SpNR Sample

SAMPLE

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SpNR 
 

N/A
N/A

Noise Gate 
 

Locked
Locked

Speech + Pink Noise Handling 
 

N/A
N/A

Speech + Pink Noise Audio Sample  

JOIN NOW
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Speech + Subway Noise Handling 
 

N/A
N/A

Speech + Subway Noise Audio Sample  

JOIN NOW
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Active Features

Battery 
 

N/A
N/A

Battery Type 
 

Locked
Locked

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 
 

Locked
Locked

Audio While Charging 
 

Locked
Locked

Passive Playback 
 

Locked
Locked

Charging Port  

Locked
Locked

App Support 
 

N/A
N/A

App Picture  

Sennheiser HD 6XX App Picture Sample

SAMPLE

JOIN NOW

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HiFiMan Sundara 2020 App Picture Sample

SAMPLE

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App Name  

Locked
Locked

iOS  

Locked
Locked

Android  

Locked
Locked

macOS  

Locked
Locked

Windows  

Locked
Locked

Equalizer 
 

Locked
Locked

ANC Control 
 

Locked
Locked

Mic Control  

Locked
Locked

Room Effects 
 

Locked
Locked

Playback Control 
 

Locked
Locked

Button Mapping  

Locked
Locked

Surround Support 
 

Locked
Locked
Connectivity

Wired Connection 
 

N/A
N/A

Cable Picture  

Sennheiser HD 6XX Cable Picture Sample

SAMPLE

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HiFiMan Sundara 2020 Cable Picture Sample

SAMPLE

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Analog Audio 
 

Locked
Locked

USB Audio 
 

Locked
Locked

Detachable 
 

Locked
Locked

Length 
 

Lock ft (Lock m)
Lock ft (Lock m)

Connector 
 

Locked
Locked

Latency - Analog 
 

Lock ms
Lock ms

Latency - USB 
 

N/A
N/A

Recorded Latency 
 

JOIN NOW
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Recorded Latency Connection  

Locked
Locked
Show Text 

Bluetooth Connection 
 

N/A
N/A

Bluetooth Version 
 

Locked
Locked

Multi-Device Pairing 
 

Locked
Locked

Quick Pair (Android) 
 

Locked
Locked

Quick Pair (iOS) 
 

Locked
Locked

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
N/A

Latency - aptX Adaptive (Low Latency) 
 

N/A
N/A

Latency - LDAC 
 

N/A
N/A

Recorded Latency 
 

JOIN NOW
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Recorded Latency Codec  

Locked
Locked

AAC Support 
 

Locked
Locked

Wireless Connection (Dongle) 
 

N/A
N/A

Line Of Sight Range 
 

N/A
N/A

Latency - Dongle 
 

N/A
N/A

Recorded Latency 
 

JOIN NOW
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Show Text 

PC Compatibility 
 

Analog 
 

Locked
Locked

Wired USB 
 

Locked
Locked

Non-BT Wireless 
 

Locked
Locked
Show Text 

PlayStation Compatibility 
 

PS4 Analog 
 

Locked
Locked

PS4 Wired USB 
 

Locked
Locked

PS4 Non-BT Wireless 
 

Locked
Locked

PS5 Analog 
 

Locked
Locked

PS5 Wired USB 
 

Locked
Locked

PS5 Non-BT Wireless 
 

Locked
Locked
Show Text 

Xbox Compatibility 
 

Xbox One Analog 
 

Locked
Locked

Xbox One Wired USB 
 

Locked
Locked

Xbox One Non-BT Wireless 
 

Locked
Locked

Xbox Series X|S Analog 
 

Locked
Locked

Xbox Series X|S Wired USB 
 

Locked
Locked

Xbox Series X|S Non-BT Wireless 
 

Locked
Locked
Show Text 

Base/Dock 
 

N/A
N/A

Type 
 

Locked
Locked

USB Input 
 

Locked
Locked

Line In 
 

Locked
Locked

Line Out 
 

Locked
Locked

Optical Input 
 

Locked
Locked

RCA Input 
 

Locked
Locked

Dock Charging 
 

Locked
Locked

Power Supply 
 

Locked
Locked

Check Price

Midnight Blue
HD 6XX
SEARCH
Amazon.com
Black
Sundara 2020
SEARCH
Amazon.com
Midnight Blue
HD 6XX
SEARCH
B&H
Black
Sundara 2020
SEARCH
B&H
Midnight Blue
HD 6XX
SEARCH
BestBuy.com
Black
Sundara 2020
SEARCH
BestBuy.com
Midnight Blue
HD 6XX
SEARCH
Sennheiser
Black
Sundara 2020
SEARCH
HiFiMan
Midnight Blue
HD 6XX
SEARCH
Walmart.com
Black
Sundara 2020
SEARCH
Walmart.com
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Sennheiser HD 6XX

HiFiMan Sundara 2020

Comments

  1. Comparison
 • Posted 2 years ago

Sennheiser HD 6XX vs HiFiMan Sundara 2020: Main Discussion

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