Used / Open-Box FiiO K9 Pro ESS Desktop DAC/AMP

Reference price $379.00

Reference price is for price anchoring only. Final quote depends on condition, accessories, version, stock, and destination.

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Unit details confirmed before offer
Lab-inspected before dispatch
DOA support and repair path available

Product overview

The FiiO K9 Pro ESS is a Desktop DAC/AMP for connecting digital sources to headphones or compact audio systems. HiFiLoop uses this page as a focused model page for used / open-box private-quote requests.

Key features

Desktop DAC and headphone amplifier for USB, coaxial, optical, Bluetooth, and analog line input systems.
Dual ESS ES9038PRO DAC architecture and THX AAA 788+ amplification support desktop-grade headphone use.
Truly balanced signal path with 4.4mm and XLR4 balanced headphone outputs plus 6.35mm single-ended output.
QCC5124 Bluetooth reception supports AAC, SBC, aptX family codecs, LDAC, and aptX Adaptive.
RCA and XLR line outputs support active speakers, amplifiers, and compact desktop systems.
FIIO Control support, dual femtosecond clocks, MQA renderer support, and dual-voltage linear transformer support flexible operation.

Key specifications

Product type	Desktop DAC/AMP
DAC architecture	Dual ESS ES9038PRO
USB / Bluetooth	XMOS XUF208 USB; QCC5124 Bluetooth reception
Amplifier	THX AAA 788+ x2
LPF / volume	OPA1612 x2; NJU72315 x2
Supported formats	USB DAC up to 384kHz / 32-bit and DSD256; coaxial up to 192kHz / 24-bit; optical up to 96kHz / 24-bit
Outputs	6.35mm headphone, 4.4mm balanced headphone, XLR4 balanced headphone, RCA line, XLR3 balanced line
Headphone impedance	Recommended 16-600 ohms
Balanced output power	Up to 2.1W at 32 ohms and 1.1W at 300 ohms, THD+N < 1%
Dimensions / weight	About 200 x 224.5 x 72 mm excluding feet; about 2750 g

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What this listing means

This is a used / open-box reference page for this model. The exact unit, included kit, timing, and support terms are confirmed before payment.

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Inspection & condition

Function, cosmetics, accessories, and known limitations are reviewed for the exact unit before dispatch.

Shipping & support

Processing is normally 3-5 business days after confirmation. International delivery is commonly 7-15 days; DOA and repair support are confirmed by destination.

What does Reference price mean?

It is a price anchor for comparison. It is not the final quote.

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