FiiO K9 Pro ESS: a desktop DAC/amp that pairs dual ES9068AS converters, one per channel, with THX AAA 788+ amplification, DSD512 support and LDAC Bluetooth. It is aimed at listeners driving demanding full-size headphones at a desk who still want good wireless playback outside serious listening sessions.
Who the FiiO K9 Pro ESS is for
Full-size headphone owners: It is a serious match for demanding full-size headphones.
Low-distortion purists: THX AAA 788+ is a well-known low-distortion topology for people who want the amp to stay out of the way.
DSD and hi-res libraries: Dual ES9068AS chips handle conversion with one per channel, and DSD512 support covers high-rate DSD files.
Computer-based desks: It works as a USB DAC, so a computer can feed it directly.
Casual wireless listening: LDAC Bluetooth gives good wireless playback when you are not sitting down for a dedicated session.
FiiO K9 Pro ESS key specs
Type: Desktop USB DAC and headphone amplifier
DAC chips: Dual ES9068AS (one per channel)
Amplification: THX AAA 788+
DSD support: DSD512
Bluetooth codec: LDAC
Color: Black
Genuine FiiO stock, 45-day returns.
FiiO K9 Pro ESS vs similar options
vs SMSL DO400: Fully balanced DAC/amp on an ES9039MSPRO chip rather than dual ES9068AS, with an XMOS XU316 interface, MQA-CD and Bluetooth 5.1; both reach DSD512, and it costs less.
vs FiiO K17: FiiO's flagship all-in-one swaps dual ES9068AS and THX AAA 788+ for AK4191EQ plus dual AK4499EX and a discrete Class AB stage rated 4000mW + 4000mW, with 31-band PEQ and network streaming; it costs more.
vs Moondrop x SMSL DHA15: Moondrop and SMSL's all-in-one runs dual CS43198 chips with DSD256 and 32-bit/384kHz decoding; pick the K9 Pro ESS if your library includes DSD512 files.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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