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  5. TH900mk2
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Fostex TH900mk2  Headphones Review

Notice: Below are the preliminary measurements for the Fostex TH900mk2. Insiders have early access to the test results, and some measurements may be updated before publication.

The full review will be published in a few days.
Tested using Methodology v2.0 
Fostex TH900mk2
EnclosureClosed-Back
TypeOver-ear
WirelessNo
TransducerDynamic
Noise CancellingNo
MicNo
Sound Signature
Balanced
Bass Amount
Slightly Underemphasized (-1 dB)
Treble Amount
Slightly Underemphasized (-2 dB)
 0

Changelog

  1.  Updated Jan 30, 2026: Early access published.
  2.  Updated Jan 22, 2026: Our testers have started testing this product.
  3.  Updated Sep 08, 2025: The product has arrived in our lab, and our testers will start evaluating it soon.
  4.  Updated Jul 29, 2025: We've purchased the product and are waiting for it to arrive in our lab.

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Test Results

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Sound
Sound Profile
SAMPLE
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Normalization Frequency
LockedLock Hz
Bass Amount
LockedLocked
Treble Amount
LockedLocked
Sound Signature
LockedLocked
LEARN ABOUT SOUND PROFILE 
0.0
Frequency Response Consistency
SAMPLE
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SAMPLE
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Std. Deviation
LockedLock dB
LEARN ABOUT FREQUENCY RESPONSE CONSISTENCY 
Raw Frequency Response
SAMPLE
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SAMPLE
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LEARN ABOUT RAW FREQUENCY RESPONSE 
0.0
Bass Profile: Target Compliance
SAMPLE
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RMS Deviation From Target
LockedLock dB
Low-Frequency Extension
LockedLock Hz
Low Bass
LockedLock dB
Mid Bass
LockedLock dB
High Bass
LockedLock dB
LEARN ABOUT BASS PROFILE: TARGET COMPLIANCE 
0.0
Mid-Range Profile: Target Compliance
SAMPLE
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RMS Deviation From Target
LockedLock dB
Low Mid
LockedLock dB
Mid-Mid
LockedLock dB
High Mid
LockedLock dB
LEARN ABOUT MID-RANGE PROFILE: TARGET COMPLIANCE 
0.0
Treble Profile: Target Compliance
SAMPLE
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RMS Deviation From Target
LockedLock dB
Low Treble
LockedLock dB
Mid Treble
LockedLock dB
High Treble
LockedLock dB
LEARN ABOUT TREBLE PROFILE: TARGET COMPLIANCE 
0.0
Peaks/Dips
SAMPLE
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Peaks
LockedLock dB
Dips
LockedLock dB
LEARN ABOUT PEAKS/DIPS 
0.0
Stereo Mismatch
SAMPLE
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SAMPLE
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Weighted Amplitude Mismatch
LockedLock dB
Weighted Frequency Response Mismatch
LockedLock dB
Weighted Phase Mismatch
LockedLock°
LEARN ABOUT STEREO MISMATCH 
0.0
Group Delay
Weighted Group Delay
LockedN/A
Cumulative Spectral Decay
SAMPLE
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LEARN ABOUT CUMULATIVE SPECTRAL DECAY 
0.0
PRTF
SAMPLE
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PRTF Accuracy (RMS Deviation)
LockedLock dB
PRTF Size (Avg.)
LockedLock dB
PRTF Distance
LockedLock dB
LEARN ABOUT PRTF 
0.0
Harmonic Distortion
SAMPLE
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SAMPLE
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WHD @ 94 dB SPL
LockedLock%
WHD @ 104 dB SPL
LockedLock%
LEARN ABOUT HARMONIC DISTORTION 
Electrical Aspects
SAMPLE
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Sensitivity @1kHz-1V
LockedLock dB SPL
Bluetooth Max SPL
LockedN/A
0.0
Virtual Soundstage
Head Modeling
LockedLocked
Speaker Modeling
LockedLocked
Room Ambience
LockedLocked
Head Tracking
LockedLocked
Virtual Surround
LockedLocked
LEARN ABOUT VIRTUAL SOUNDSTAGE 
Test Settings
Firmware
LockedLocked
Power
LockedLocked
Connection
LockedLocked
Codec
LockedLocked
Test InstrumentLockedLocked
EQ
LockedLocked
ANC
LockedLocked
Tip/Pad
LockedLocked
Microphone
LockedLocked
LEARN ABOUT TEST SETTINGS 
Design
Style
SAMPLE
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TypeLockedLocked
EnclosureLockedLocked
WirelessLockedLocked
TransducerLockedLocked
0.0
Comfort
SAMPLE
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WeightLockedLock lbs
Clamping Force
LockedLock lbs
LEARN ABOUT COMFORT 
0.0
Controls
OS Compatibility
LockedLocked
Ease Of UseLockedLocked
FeedbackLockedLocked
Call/Music ControlLockedLocked
Volume ControlLockedLocked
Microphone ControlLockedLocked
Channel Mixing
LockedLocked
Noise Cancelling ControlLockedLocked
Talk-Through
LockedLocked
Additional ControlsLockedLocked
LEARN ABOUT CONTROLS 
0.0
Portability
SAMPLE
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LLockedLock" (Lock cm)
WLockedLock" (Lock cm)
HLockedLock" (Lock cm)
VolumeLockedLock in³ (Lock cm³)
Transmitter RequiredLockedLocked
LEARN ABOUT PORTABILITY 
0.0
Case
SAMPLE
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TypeLockedLocked
LLockedN/A
WLockedN/A
HLockedN/A
VolumeLockedN/A
LEARN ABOUT CASE 
0.0
Build Quality
SAMPLE
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LEARN ABOUT BUILD QUALITY 
0.0
Stability
SAMPLE
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LEARN ABOUT STABILITY 
Headshots 1
SAMPLE
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SAMPLE
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Headshots 2
SAMPLE
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SAMPLE
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Top
SAMPLE
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In The Box
SAMPLE
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Isolation
0.0
Noise Isolation - Full Range
SAMPLE
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Noise CancellingLockedLocked
Overall Attenuation
LockedLock dB
Bass
LockedLock dB
Mid
LockedLock dB
Treble
LockedLock dB
LEARN ABOUT NOISE ISOLATION - FULL RANGE 
0.0
Noise Isolation - Common Scenarios
SAMPLE
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Airplane Noise Attenuation
LockedLock dB
Airplane Noise Isolation Audio
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Office Noise Attenuation
LockedLock dB
Office Noise Isolation Audio
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Street Noise Attenuation
LockedLock dB
Street Noise Isolation Audio
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Noise Isolation - Voice Handling
Female Voice 1
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Male Voice 1
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Female Voice 2
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Male Voice 2
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ANC Wind Handling
ANC Wind Noise
N/A
0.0
Leakage
SAMPLE
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Leakage Audio
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Overall Leakage @ 1ft
LockedLock dB
LEARN ABOUT LEAKAGE 
Microphone
Microphone Style
Integrated
LockedLocked
In-Line
LockedLocked
Boom
LockedLocked
Detachable Boom
LockedLocked
MicLockedLocked
LEARN ABOUT MICROPHONE STYLE 
0.0
Recording Quality
Recorded Speech
N/A
LFE
LockedN/A
FR Std. Dev.
LockedN/A
HFE
LockedN/A
Weighted THD
LockedN/A
Gain
LockedN/A
LEARN ABOUT RECORDING QUALITY 
0.0
Noise Handling
SpNR
LockedN/A
Noise Gate
LockedLocked
Speech + Pink Noise Handling
LockedN/A
Speech + Pink Noise Audio SampleN/A
Speech + Subway Noise Handling
LockedN/A
Speech + Subway Noise Audio SampleN/A
LEARN ABOUT NOISE HANDLING 
Active Features
0.0
Battery
Battery Type
LockedLocked
Continuous Battery Life
LockedN/A
Additional Charges
LockedN/A
Total Battery Life
LockedN/A
Charge Time
LockedN/A
Power-Saving Feature
LockedLocked
Audio While Charging
LockedLocked
Passive Playback
LockedLocked
Charging PortLockedLocked
LEARN ABOUT BATTERY 
N/A
App Support
App NameLockedLocked
iOSLockedLocked
AndroidLockedLocked
macOSLockedLocked
WindowsLockedLocked
Equalizer
LockedLocked
ANC Control
LockedLocked
Mic ControlLockedLocked
Room Effects
LockedLocked
Playback Control
LockedLocked
Button MappingLockedLocked
Surround Support
LockedLocked
LEARN ABOUT APP SUPPORT 
Connectivity
0.0
Wired Connection
SAMPLE
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Analog Audio
LockedLocked
USB Audio
LockedLocked
Detachable
LockedLocked
Length
LockedLock ft (Lock m)
Connector
LockedLocked
Latency - Analog
LockedLock ms
Latency - USB
LockedN/A
Recorded Latency
GET INSIDER ACCESSto hear audio samples
Recorded Latency ConnectionLockedLocked
LEARN ABOUT WIRED CONNECTION 
0.0
Bluetooth Connection
Bluetooth Version
LockedLocked
Multi-Device Pairing
LockedLocked
Quick Pair (Android)
LockedLocked
Quick Pair (iOS)
LockedLocked
Line Of Sight Range
LockedN/A
Latency - SBC
LockedN/A
Latency - aptX
LockedN/A
Latency - aptX Adaptive (High Quality)
LockedN/A
Latency - aptX Adaptive (Low Latency)
LockedN/A
Latency - LDAC
LockedN/A
Recorded Latency
N/A
Recorded Latency CodecLockedLocked
AAC Support
LockedLocked
LEARN ABOUT BLUETOOTH CONNECTION 
0.0
Wireless Connection (Dongle)
Line Of Sight Range
LockedN/A
Latency - Dongle
LockedN/A
Recorded Latency
N/A
LEARN ABOUT WIRELESS CONNECTION (DONGLE) 
PC Compatibility
Analog
LockedLocked
Wired USB
LockedLocked
Non-BT Wireless
LockedLocked
PlayStation Compatibility
PS4 Analog
LockedLocked
PS4 Wired USB
LockedLocked
PS4 Non-BT Wireless
LockedLocked
PS5 Analog
LockedLocked
PS5 Wired USB
LockedLocked
PS5 Non-BT Wireless
LockedLocked
LEARN ABOUT PLAYSTATION COMPATIBILITY 
Xbox Compatibility
Xbox One Analog
LockedLocked
Xbox One Wired USB
LockedLocked
Xbox One Non-BT Wireless
LockedLocked
Xbox Series X|S Analog
LockedLocked
Xbox Series X|S Wired USB
LockedLocked
Xbox Series X|S Non-BT Wireless
LockedLocked
LEARN ABOUT XBOX COMPATIBILITY 
0.0
Base/Dock
Type
LockedLocked
USB Input
LockedLocked
Line In
LockedLocked
Line Out
LockedLocked
Optical Input
LockedLocked
RCA Input
LockedLocked
Dock Charging
LockedLocked
Power Supply
LockedLocked
LEARN ABOUT BASE/DOCK 
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