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  1. Home
  2. Headphones
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  1. Table of Contents
  2. Top
  3. Main Differences
  4. 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. Stereo Mismatch
    9. Group Delay
    10. Cumulative Spectral Decay
    11. PRTF
    12. Harmonic Distortion
    13. Electrical Aspects
    14. Virtual Soundstage
    15. Test Settings
    16. Imaging
    17. Weighted Harmonic Distortion
  5. 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
  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

Sennheiser HD 6XX vs HiFiMan Sundara 2020

Side-by-Side Comparison

Products

Sennheiser HD 6XX
HiFiMan Sundara 2020

Tested using Methodology v1.6

Updated Jun 09, 2025 09:07 PM

SEE PRICE
BestBuy.com

Tested using Methodology v2.0

Updated Apr 24, 2025 06:41 PM

SEE PRICE
Amazon.com
Sennheiser HD 6XX Picture
HiFiMan Sundara 2020 Picture
TypeOver-ear
Noise CancellingNo
EnclosureOpen-Back
WirelessNo
TransducerDynamic
MicNo
TypeOver-Ear
Noise CancellingNo
EnclosureOpen-Back
Bass Amount
Slightly Underemphasized (-3 dB)
WirelessNo
TransducerPlanar Magnetic
Treble Amount
Slightly Underemphasized (-2 dB)
MicNo
Sound Signature
Flat
  1. Recommended in 3 articles:
  2. Music
  3. Critical Listening
  4. Open-Back

Variants

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

Review

See Sennheiser HD 6XX Review
See HiFiMan Sundara 2020 Review
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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.

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