Trustscore 4.8

FiiO K9 PRO Desktop DAC and Headphone Amp

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Key Features

  • ESS Edition, with dual ES9038 Pro DACs
  • Clean and powerful THX AAA 788+ amplification
  • Supports high-res audio including MQA technology
  • Linear power supply for stable, uninterrupted power
  • Comprehensive desktop connection options including Bluetooth

FiiO K9 PRO Desktop DAC and Headphone Amp Overview

View this description in German

The FiiO K9 PRO ESS Desktop Headphone Amplifier & DAC features flagship-quality dual ES9038 Pro DAC chips, catering to audiophiles who prioritise pristine sound clarity on a desktop scale. These components deliver intricate sound fidelity with minimal distortion, making them ideal for a wide range of hi-res audio formats. Coupled with the robust THX AAA 788+ amplification, the device ensures a powerful, noise-free output perfect for all types of headphones.


It also supports MQA technology, providing you access to master-quality audio that remains true to the original studio recordings. With extensive convenience options including high-resolution Bluetooth, app control, and luminous RGB light indicators to display your sampling rate, the FiiO K9 PRO ESS stands as a versatile and sleek choice for enhancing your desktop system.

Product Ref: 294772

Full Description

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What's in the box?

  • The FiiO K9 PRO Desktop DAC and Headphone Amp
  • Power cable
  • Bluetooth antenna
  • USB Type-B cable
  • 6.35mm to 3.5mm adapter
  • Sticky feet
  • Vertical stand tray
  • Quick start guide

Specifications

General

Name / Model No. K9 Pro ESS
Colour Black
Weight 2750g
Gain L/M/H
Bluetooth format indication Supported
Firmware upgrade System firmware and Bluetooth version can be upgraded via USB
Low battery reminder /
Bluetooth transmission /
Bluetooth format indicator SBC: blue

AAC: cyan

aptX HD: yellow

aptX: purple

aptX LL: purple

LDAC: white

aptX Adaptive: green
Maximum supported sampling rate 384kHz-32bit DSD256 (USB DAC)

192kHz-24bit (coaxial)

96kHz-24bit (optical)
Hardware solution DAC: 2 x ES9038PRO

USB: XMOS XU208

Bluetooth: QCC5124

LPF: 2 x OPA1612

Volume IC: 2 x NJU72315

AMP: 2 x THX AAA 788+

Linear transformer: THALIN BingZi
Volume Scroll Potentiometer-ADC Sampling
Channel balance L12–R12 (0.5dB per level)
FiiO Control Supported
Sampling rate indication Supported
Deep standby Long press the multi-function button for about 3s
Dimensions ≈200x224.5x72mm (excluding feet)
Bluetooth receiver (5.0) AAC/SBC/aptX/aptX LL/aptX HD/LDAC/aptX Adaptive
Charging indicator /
Recommended headphone impedance 16-600 Ω

Button and interfaces

Button Physical key + toggle switch
Single-ended line input interface RCA socket
SPDIF in Optical fibre socket
Balanced output interface 4.4mm socket, XLR4 balanced socket
Balanced line output interface XLR3 balanced socket
USB Type-C, USB B (data transmission)
Balanced line input interface 4.4mm balanced socket
Digital coaxial input interface RCA socket
Headphone output interface Standard 6.35 mm socket
Single-ended line output interface RCA socket

Power parameters

Power parameters AC 110-115V/ AC 220-230V (Recommended)
Power supply /
Charging time /
Battery capacity /
PO battery life /

Single-ended line output performance

THD+N < 0.00042% (1kHz 10kΩ dbA)
Crosstalk ≥115dB (1kHz 10kΩ)
Frequency response 20Hz–20kHz (-3dB)
SNR ≥123dB (dbA)
Noise floor < 1.9µV (dbA)
Line Level 2.5Vrms (1kHz 10kΩ)

Balanced line output performance

THD+N < 0.00025% (1kHz 10kΩ dbA)
Crosstalk ≥125dB (1kHz 10kΩ)
Frequency response 20Hz–50kHz (-1.5dB)
SNR ≥128dB (dbA)
Noise floor < 1.9µV (dbA)
Line Level 5Vrms (1kHz 10kΩ)

Single-ended headphone output performance (6.35mm)

Continuous undistorted output power 1 ≥1.1W (16Ω / THD+N < 1%, AUX IN)
Continuous undistorted output power 2 ≥2.1W(32Ω/THD+N < 1%, AUX IN)
Continuous undistorted output power 3 ≥281mW (300Ω / THD+N < 1%, AUX IN)
Noise floor < 2µV (dbA, AUX IN)

< 3µV (dbA, UAC/SPDIF/BT IN)
Frequency response 20 Hz–50kHz (-1.5dB)
Output impedance < 1Ω (32Ω)
Crosstalk ≥75dB (1 kHz 32Ω, AUX IN)
THD+N < 0.00033% (1 kHz 32Ω/dbA)
SNR ≥129dB (dbA)
MAX Output Voltage 26Vp-p

Balanced headphone output performance (4.4mm/XLR4)

Continuous undistorted output power 1 ≥1.1W (16Ω / THD+N < 1%)
Continuous undistorted output power 2 ≥2.1W (32Ω / THD+N < 1%)
Continuous undistorted output power 3 ≥1.1W (300Ω / THD+N < 1%)
Noise floor < 3µV (dbA, AUX IN)

4.5µV(dbA UAC/SPDIF/BT)
Frequency response 20Hz–50kHz (-3dB)
Output impedance < 1Ω (32Ω)
Crosstalk ≥114dB (1 kHz, AUX IN)
THD+N < 0.0003% (1 kHz 32Ω/dbA)
SNR ≥123dB (dbA)
MAX Output Voltage 52Vp-p

Product code

Product code FIIOK9PRO

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