Uploaded July 2026 | Updated September 2026, 2 weeks ago

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Thanks to Head-Fi user XERO1 for the loan of TH910 & 919!

Fostex website: fostex.jp/en/products/th919

Buy from Amazon (affiliate links)

910: amzn.to/4bf7FoJ

Buy from Mimic Audio (affiliate links)
910: mimic-audio.com/products/fostex-th-910-dynamic-headphones?bg_ref=0IkoeJqKMz
919: mimic-audio.com/products/fostex-th-919-open-back-dynamic-headphones?bg_ref=0IkoeJqKMz

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Test Gear...

All music was digital in lossless or hi-rez FLAC or DSD formats either played locally or streamed from Qobuz (FLAC only), all through Roon.

Chain 1

Sonore opticalRendu Deluxe Edition (review coming) USB output into Berkeley Alpha USB DDC (youtu.be/94AvDeeRjHA) AES output into Berkeley Alpha S2 DAC (youtu.be/JY3c4HEyH0s) then XLR output into LTA Z10e (youtu.be/Bft6HUsYDhE)

Chain 2

Sonore ultraRendu v1.3 (youtu.be/qEOOE9rP6Rs) USB output into Singxer SU-6 DDC (youtu.be/6dr4T0Sd_NU) then I2S into either Ferrum WANDLA GSE & Oor combo (Hypsos power supply, youtu.be/Qh1b-XFH7R8, youtu.be/xUsRyoBPdyk) with Oor's XLR pre out into XLR switch or LAiV Harmony DAC (youtu.be/GtKG5_ABzAg) into XLR switch, then into either Niimbus HPA US5 Pro (youtu.be/lLlPJyvGSIQ) or Cayin HA-300mkiii (review coming!)

Chain 3

FiiO M33 R2R DAP in Roon mode (youtu.be/byeOH9YPAGc) USB output into Weiss Engineering INT-204 DDC (youtu.be/94AvDeeRjHA) then AES into Schiit Gungnir 2 DAC (youtu.be/XzOPRleWXgE) XLR output into Jensen ISO MAX PC-32X xlr-to-rca transformer then into Schiit Lyr 5 (youtu.be/AL4m9taaMGM)

Chain 4

Audiobyte Super stack (under review)

Compared Headphones

Dan Clark E3: youtu.be/liuVrWBxo-c
Focal Stellia: youtu.be/xxpo_eW9oco
HiFiMan HE1000 Unveiled: youtu.be/pSXKdoYg0Tc
ZMF Caldera Closed: youtu.be/OGuZD_zeNcQ


Timestamps..

00:00 Intro, Pricing, Disclaimer
02:26 Shameless Self Promotion
02:58 Setup, Takeaways, Specs
06:14 Build, Ergonomics, Cabling
12:49 910 Sound Leak Demo
19:25 Sound
29:18 Market Comparisons
37:09 Amp Pairings
41:19 Wrap Up