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  1. Home
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Sennheiser HD 599 vs HD 6XX

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 SettingsImagingWeighted Harmonic Distortion
    Design
      StyleComfortControlsBreathabilityPortabilityCaseBuild 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 599
Sennheiser HD 6XX

Tested using Methodology v1.5

Updated Feb 06, 2026 06:21 PM

SEE PRICE
Amazon.com

Tested using Methodology v2.1

Updated Mar 09, 2026 05:39 PM

SEARCH
Amazon.com
Sennheiser HD 599 Picture

Track

Sennheiser HD 6XX Picture

Track

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

Our Verdict

Sennheiser HD 599

Sennheiser HD 6XX

The Sennheiser HD 599 and the Sennheiser HD 6XX are fairly evenly matched headphones, and you may prefer either. The 599 are much more comfortable and have a more open sound, but their sound may be a bit muddy to some given the bump in their low-mid range. On the other hand, the 6XX have a more stable fit, a better build quality, and a more accurate mid-range response. That said, there isn't a huge difference between the two sound profiles, and either pair is a great option if you're looking for headphones for neutral sound. 

0 

Variants

  • HD 599 SE (Black)
  • HD 599 (Ivory)
  • HD 6XX (Midnight Blue)

Review

See Sennheiser HD 599 Review
See Sennheiser HD 6XX Review
3 
2 

Check Price

Black
HD 599 SE
SEE PRICE
Amazon.com
Midnight Blue
HD 6XX
SEARCH
Amazon.com
Ivory
HD 599
SEE PRICE
Amazon.com
Midnight Blue
HD 6XX
SEARCH
B&H
 
Midnight Blue
HD 6XX
SEARCH
BestBuy.com
 
Midnight Blue
HD 6XX
SEARCH
Sennheiser
 
Midnight Blue
HD 6XX
SEARCH
Walmart.com
Read more

Main Differences for
Neutral Sound

Threshold 

0.10

Neutral Sound 
 

0.0
N/A
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Full Comparison

Sound

Sound Profile 
 

Sound Profile  

Sennheiser HD 599 Sound Profile Sample

SAMPLE

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for pictures & test results

Sennheiser HD 6XX Sound Profile Sample

SAMPLE

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for pictures & test results

Normalization Frequency 
 

Lock Hz

Bass Amount 
 

Locked

Bass Amount 
 

Lock dB

Treble Amount 
 

Lock dB

Treble Amount 
 

Locked

Sound Signature 
 

Locked
Show Text 

Frequency Response Consistency 
 

N/A
N/A

Consistency L  

Sennheiser HD 599 Consistency L Sample

SAMPLE

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Sennheiser HD 6XX Consistency L Sample

SAMPLE

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Consistency R  

Sennheiser HD 599 Consistency R Sample

SAMPLE

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Sennheiser HD 6XX Consistency R Sample

SAMPLE

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Std. Deviation 
 

Lock dB
Lock dB
Show Text 

Raw Frequency Response 
 

Raw FR L  

Sennheiser HD 599 Raw FR L Sample

SAMPLE

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Sennheiser HD 6XX Raw FR L Sample

SAMPLE

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Raw FR R  

Sennheiser HD 599 Raw FR R Sample

SAMPLE

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for pictures & test results

Sennheiser HD 6XX Raw FR R Sample

SAMPLE

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for pictures & test results

Bass Profile: Target Compliance 
 

N/A
N/A

Bass Profile: Target Compliance  

Sennheiser HD 599 Bass Profile: Target Compliance Sample

SAMPLE

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Sennheiser HD 6XX Bass Profile: Target Compliance Sample

SAMPLE

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for pictures & test results

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 599 Mid-Range Profile: Target Compliance Sample

SAMPLE

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Sennheiser HD 6XX 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 599 Treble Profile: Target Compliance Sample

SAMPLE

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Sennheiser HD 6XX Treble Profile: Target Compliance Sample

SAMPLE

JOIN NOW

for pictures & test results

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 599 Peaks/Dips Graph Sample

SAMPLE

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for pictures & test results

Sennheiser HD 6XX 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 599 Frequency Response Mismatch Sample

SAMPLE

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Sennheiser HD 6XX Frequency Response Mismatch Sample

SAMPLE

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for pictures & test results

Phase Response Mismatch  

Sennheiser HD 599 Phase Response Mismatch Sample

SAMPLE

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Sennheiser HD 6XX Phase Response Mismatch Sample

SAMPLE

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for pictures & test results

Weighted Amplitude Mismatch 
 

Lock
Lock dB

Weighted Frequency Response Mismatch 
 

Lock
Lock dB

Weighted Phase Mismatch 
 

Lock
Lock°
Show Text 

Cumulative Spectral Decay 
 

CSD  

Sennheiser HD 599 CSD Sample

SAMPLE

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for pictures & test results

Sennheiser HD 6XX CSD Sample

SAMPLE

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for pictures & test results

PRTF 
 

N/A
N/A

PRTF  

Sennheiser HD 599 PRTF Sample

SAMPLE

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for pictures & test results

Sennheiser HD 6XX PRTF Sample

SAMPLE

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for pictures & test results

PRTF Accuracy (RMS Deviation) 
 

Lock dB
Lock dB

PRTF Size (Avg.) 
 

Lock dB
Lock dB

PRTF Distance 
 

Lock dB
Lock dB

Openness 
 

0.0

Acoustic Space Excitation 
 

0.0
Show Text 

Harmonic Distortion 
 

N/A
N/A

Harmonics Levels  

Sennheiser HD 599 Harmonics Levels Sample

SAMPLE

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for pictures & test results

Sennheiser HD 6XX Harmonics Levels Sample

SAMPLE

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for pictures & test results

THD Ratio  

Sennheiser HD 599 THD Ratio Sample

SAMPLE

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for pictures & test results

Sennheiser HD 6XX THD Ratio Sample

SAMPLE

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for pictures & test results

WHD @ 94 dB SPL 
 

Lock
Lock%

WHD @ 104 dB SPL 
 

Lock
Lock%

Electrical Aspects 
 

Impedance  

Sennheiser HD 599 Impedance Sample

SAMPLE

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for pictures & test results

Sennheiser HD 6XX Impedance Sample

SAMPLE

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for pictures & test results

Sensitivity @1kHz-1V 
 

Lock dB SPL

Bluetooth Max SPL 
 

N/A
Show Text 

Virtual Soundstage 
 

N/A
N/A

Virtual Soundstage  

Sennheiser HD 599 Virtual Soundstage Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Virtual Soundstage Sample

SAMPLE

JOIN NOW

for pictures & test results

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

EQ 
 

Locked
Locked

ANC 
 

Locked
Locked

Tip/Pad 
 

Locked
Locked

Microphone 
 

Locked
Locked
Show Text 

Imaging 
 

N/A
N/A

Group Delay  

Sennheiser HD 599 Group Delay Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Group Delay Sample

SAMPLE

JOIN NOW

for pictures & test results

Phase Response Mismatch  

Sennheiser HD 599 Phase Response Mismatch Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Phase Response Mismatch Sample

SAMPLE

JOIN NOW

for pictures & test results

Weighted Group Delay 
 

Lock

Weighted Phase Mismatch 
 

Lock
Lock°

Weighted Amplitude Mismatch 
 

Lock
Lock dB

Weighted Frequency Mismatch 
 

Lock
Lock dB
Show Text 

Weighted Harmonic Distortion 
 

N/A
N/A

Weighted Harmonic Distortion  

Sennheiser HD 599 Weighted Harmonic Distortion Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Weighted Harmonic Distortion Sample

SAMPLE

JOIN NOW

for pictures & test results

WHD @ 90 
 

Lock
Lock%

WHD @ 100 
 

Lock
Lock%
Show Text 
Design

Style  

Design Picture 2  

Sennheiser HD 599 Design Picture 2 Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Design Picture 2 Sample

SAMPLE

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for pictures & test results

Type  

Locked
Locked

Enclosure  

Locked
Locked

Wireless  

Locked
Locked

Transducer  

Locked
Locked
Show Text 

Comfort 
 

N/A
N/A

Comfort Picture  

Sennheiser HD 599 Comfort Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Comfort Picture Sample

SAMPLE

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for pictures & test results

Weight  

Lock lbs
Lock lbs

Clamping Force 
 

Lock lbs
Lock lbs
Show Text 

Controls 
 

N/A
N/A

Controls Picture  

Sennheiser HD 599 Controls Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Controls Picture Sample

SAMPLE

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for pictures & test results

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 

Breathability 
 

N/A
N/A

Breathability After Picture  

Sennheiser HD 599 Breathability After Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Breathability After Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Avg.Temp.Difference  

Lock °C
Show Text 

Portability 
 

N/A
N/A

Portability Picture  

Sennheiser HD 599 Portability Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Portability Picture Sample

SAMPLE

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for pictures & test results

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 599 Case Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Case Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

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 599 Build Quality Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Build Quality Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Show Text 

Stability 
 

N/A
N/A

Stability Picture  

Sennheiser HD 599 Stability Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Stability Picture Sample

SAMPLE

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for pictures & test results

Show Text 

Headshots 1  

Angled Picture  

Sennheiser HD 599 Angled Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Angled Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Side Picture  

Sennheiser HD 599 Side Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Side Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Headshots 2  

Front Picture  

Sennheiser HD 599 Front Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Front Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Rear Picture  

Sennheiser HD 599 Rear Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Rear Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Top  

Top Picture  

Sennheiser HD 599 Top Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Top Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

In The Box  

In The Box Picture  

Sennheiser HD 599 In The Box Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX In The Box Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Show Text 
Isolation

Noise Isolation - Full Range 
 

N/A
N/A

Noise Isolation - Full Range Graph  

Sennheiser HD 599 Noise Isolation - Full Range Graph Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Noise Isolation - Full Range Graph Sample

SAMPLE

JOIN NOW

for pictures & test results

Noise Cancelling  

Locked
Locked

Overall Attenuation 
 

Lock dB
Lock dB

Isolation Audio 
 

JOIN NOW
JOIN NOW

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 599 Noise Isolation - Common Scenarios Graph Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Noise Isolation - Common Scenarios Graph Sample

SAMPLE

JOIN NOW

for pictures & test results

Airplane Noise Attenuation 
 

Lock dB

Airplane Noise Isolation Audio 
 

JOIN NOW
JOIN NOW

Office Noise Attenuation 
 

Lock dB

Office Noise Isolation Audio 
 

JOIN NOW
JOIN NOW

Street Noise Attenuation 
 

Lock dB

Street Noise Isolation Audio 
 

JOIN NOW
JOIN NOW
Show Text 

Noise Isolation - Voice Handling 
 

Female Voice 1 
 

JOIN NOW
JOIN NOW

Male Voice 1 
 

JOIN NOW
JOIN NOW

Female Voice 2 
 

JOIN NOW
JOIN NOW

Male Voice 2 
 

JOIN NOW
JOIN NOW

ANC Wind Handling 
 

ANC Wind Handling Graph  

Sennheiser HD 599 ANC Wind Handling Graph Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX ANC Wind Handling Graph Sample

SAMPLE

JOIN NOW

for pictures & test results

ANC Wind Noise 
 

JOIN NOW
JOIN NOW

Leakage 
 

N/A
N/A

Leakage  

Sennheiser HD 599 Leakage Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Leakage Sample

SAMPLE

JOIN NOW

for pictures & test results

Leakage Audio 
 

JOIN NOW
JOIN NOW

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 599 Microphone Frequency Response Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Microphone Frequency Response Sample

SAMPLE

JOIN NOW

for pictures & test results

Recorded Speech 
 

JOIN NOW
JOIN NOW

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 599 SpNR Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX SpNR Sample

SAMPLE

JOIN NOW

for pictures & test results

SpNR 
 

N/A
N/A

Noise Gate 
 

Locked
Locked

Speech + Pink Noise Handling 
 

N/A
N/A

Speech + Pink Noise Audio Sample  

JOIN NOW
JOIN NOW

Speech + Subway Noise Handling 
 

N/A
N/A

Speech + Subway Noise Audio Sample  

JOIN NOW
JOIN NOW
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 599 App Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX App Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

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 599 Cable Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

Sennheiser HD 6XX Cable Picture Sample

SAMPLE

JOIN NOW

for pictures & test results

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

Latency - USB 
 

Lock ms
N/A

Recorded Latency 
 

JOIN NOW
JOIN NOW

Recorded Latency Connection  

Locked
Show Text 

Bluetooth Connection 
 

N/A
N/A

Bluetooth Version 
 

Locked
Locked

Multi-Device Pairing 
 

Locked
Locked

NFC Pairing 
 

Locked

Quick Pair (Android) 
 

Locked

Quick Pair (iOS) 
 

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

Latency - aptX Adaptive (Low Latency) 
 

N/A

Latency - LDAC 
 

N/A

Recorded Latency 
 

JOIN NOW
JOIN NOW

Recorded Latency Codec  

Locked

AAC Support 
 

Locked

PC Latency (aptX HD) 
 

N/A

PC Latency (aptX-LL) 
 

N/A

iOS Latency 
 

N/A

Android Latency 
 

N/A

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
JOIN NOW
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

Black
HD 599 SE
SEE PRICE
Amazon.com
Midnight Blue
HD 6XX
SEARCH
Amazon.com
Ivory
HD 599
SEE PRICE
Amazon.com
Midnight Blue
HD 6XX
SEARCH
B&H
 
Midnight Blue
HD 6XX
SEARCH
BestBuy.com
 
Midnight Blue
HD 6XX
SEARCH
Sennheiser
 
Midnight Blue
HD 6XX
SEARCH
Walmart.com
Back to Top

Sennheiser HD 599

Sennheiser HD 6XX

Comments

  1. Comparison
 • Posted 2 years ago

Sennheiser HD 599 vs Sennheiser HD 6XX: Main Discussion

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