Uploaded August 2026 | Updated September 2026, 2 weeks ago

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Thanks to Cayin and ZMF for sending the HA-300iii for review!

Buy from ZMF: shop.zmfheadphones.com/products/cayin-ha-300b-mk-ii

Buy from Mimic Audio (affiliate link): mimic-audio.com/products/cayin-ha300-mk3?bg_ref=0IkoeJqKMz

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Buy PSVane Summit series tubes from Amazon (affiliate link):

6SN7: amzn.to/4hJWNTW
300b: amzn.to/4xa3GCR

Test Gear...

My Systems Tour: youtu.be/Y4z0ZOJzJ4g

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 ultraRendu v1.3 (youtu.be/qEOOE9rP6Rs) USB output into Singxer SU-6 DDC (youtu.be/6dr4T0Sd_NU). 2 I2S outputs, one into Ferrum WANDLA GSE w/ Hypsos power supply (youtu.be/Qh1b-XFH7R8) directly into Ferrum Oor amp (youtu.be/xUsRyoBPdyk), the other into LAiV Harmony DAC (youtu.be/GtKG5_ABzAg), both Harmony's XLR lineout and Oor's XLR preout through a switch and then into HA-300iii's XLR input

Speakers Driven...

MartinLogan Motion B10: youtu.be/D47YKAGN8iw

Headphones Driven...

Audio Technica ATH-ADX7000 (youtu.be/d7yjTA584go)
Focal Utopia OG (1): youtu.be/sqHjnH6EdM4
(2): youtu.be/tb3le-TwGnQ
Fostex TH-910: youtu.be/kKmCFuRv-lM
Fostex TH-919: youtu.be/kKmCFuRv-lM
Fostex TH-1000rpmk2: youtu.be/yJiIuX78s24
Fostex TH-1100rpmk2: youtu.be/yJiIuX78s24
HiFiMan HE1000 Unveiled: youtu.be/pSXKdoYg0Tc
HiFiMan Susvara OG (1): youtu.be/mZJ78eXWkt0
(2): youtu.be/oUrJx173P5M
HiFiMan Susvara Unveiled: youtu.be/WI1gnx2tD7s
Lily Audio Genesis One (review coming!)
ZMF Tessidera (review coming!)

Compared Amps...

LTA Z10e: youtu.be/Bft6HUsYDhE
Niimbus HPA US5 Pro: youtu.be/lLlPJyvGSIQ

Timestamps...

00:00 Intro, Pricing, Disclaimer
01:22 Shameless Self Promotion
01:54 About HA-300iii
05:44 Build, Feature, I/O
13:38 Gets Warm!
14:50 Sound
21:32 Tube Rolling
26:17 Comparison with LTA Z10e
32:55 Wrap Up
34:44 Dancing VU Meters!