FiiO K9 AKM Refurbished

FiiO K9 AKM

Desktop DAC and headphone amplifier

•     AK4191EQ + AK4499EX digital analogue converter
•     USB-C port on the right side of the device
•     THX AAA 788+ amplifier
•     Dual-Mode Clock Management
•     QCC5124 Bluetooth support for LDAC/aptX Adaptive and other high-resolution Bluetooth formats
•     App connectivity
•     Fully balanced design
•     Linear dual-voltage transformer (separate analogue and digital power supply)
•     Versatile inputs and outputs

Powerful dual cores - for thrilling sound
AK4191EQ + AK4499EX DACs manage the left and right channels and form the high-quality heart of the FiiO K9 AKM. Listen to your favourite playlist and immerse yourself in the music instantly.

High-quality amplifier - refreshingly powerful
The ace up the FiiO K9 AKM's sleeve is the THX AAA 788+ amplifier, which gives it an exceptional undistorted output power of 1% up to 780 mW at 300Ω and up to 2000 mW at 32Ω. Whether you're using low impedance or high impedance headphones, the K9 will drive them with flying colours.

Precisely designed - Perfectly balanced design - Music for your ears
From the DAC to the volume control to the amplification, every part of the FiiO K9 AKM is truly balanced to reduce crosstalk and achieve authentic sound.

Partitioned design - for maximum performance of each section
The circuit board of the K9 AKM has a partitioned layout that completely separates the most important areas of the audio circuit - the power supply, the signals and the analogue signal loop. This guarantees the integrity of the audio signal being processed.

Six-stage audio circuit - faithful sound reproduction
The six-stage desktop quality audio circuit has been carefully designed to ensure a pure, refined yet full sound. I/V conversion, LPF filter, digital volume control, buffer amplifier, pre-amplifier, post-amplifier

Electricity is the mother of sound - Robust power supply - Plenty of power
The linear transformer is paired with 4 massive 4700uF capacitors to deliver clean continuous power.

Isolated power supply for digital and analogue sections
For a purer sound The digital and analogue sections of the K9 AKM are powered separately to reduce interference between the two audio circuits and ensure a pure and faithful reproduction of your music.

Multiple LDOs in multiple stages - Truly stable performance
Power stabilisation and filtering within the audio circuit plays a major role in ensuring excellent sound quality. Extremely low-noise LDOs are used for voltage regulation in each stage of the audio circuit.

Dual-mode clock management - even more sound enhancement
Thanks to precise and stable dual-mode clock management, the FiiO K9 AKM can reproduce high-resolution audio data with the highest fidelity, as if you were there with the artists. * Supports up to 768kHz/32bit PCM and DSD512

High-resolution Bluetooth - fulfils all your audiovisual needs
The FiiO K9 AKM uses the QCC5124 Bluetooth chip with support for LDAC/aptX HD/aptX Adaptive and other high-resolution Bluetooth formats. With the K9 AKM, you can listen to music, watch videos and play video games with high quality and low latency. *Bluetooth 5.1, supported formats: LDAC/aptX Adaptive/aptX/aptX HD/aptX LL/AAC/SBC

Compatible with UAC1.0/UAC2.0 - Highly customisable
The K9 AKM supports both UAC1.0 and UAC2.0 modes, so you can either use the K9 with devices that can simply be connected via plug-and-play, or with devices that can work with the K9 with an additional driver for even better compatibility. And with the FiiO Control App, you can easily switch between UAC1.0 and UAC2.0 modes. *UAC1.0 for PS5 and other device support

Fully capable - No matter where you look
Inputs: USB, optical, coaxial, RCA, 4.4 mm
Outputs: 6.35 mm SE, 4.4 mm balanced, XLR-4 balanced
Five input signals: USB input / optical / coaxial / LINE / Bluetooth *The line mode includes an RCA and a 4.4 mm input. If both are connected, the 4.4 mm input has priority.
Three output modes:

LO: Only the rear analogue RCA+XLR outputs are active, have the maximum output power and cannot be adjusted with the volume control
PRE: Only the rear RCA+XLR analogue outputs are active and can be adjusted with the volume control
PO: Only the front headphone outputs are active and can be adjusted with the volume control. Three levels of hardware amplification: High/Medium/Low The L level for low amplification is suitable for sensitive in-ear headphones; the H level for high amplification is suitable for less sensitive over-ear headphones.

Pretty to look at Horizontally or vertically
Adopting the well-received design language of other FiiO desktop devices, the K9 AKM features an all-aluminium construction, manufactured through an integrated stretching and CNC process to ensure case strength and precise finishing. Thanks to the vertical stand, the FiiO K9 AKM can be used both vertically and horizontally, making it a versatile part of your desktop setup.

A weighty feel for a weighty sound
The iconic, weighty FiiO volume control is supported by an ADC curve reconstruction that allows you to adjust 120 volume levels precisely and smoothly, with minimal noise and volume deviation between the left and right channels.
Lights on - Let the high-resolution music begin
The RGB lighting around the buttons not only gives the K9 and its surroundings a fun personality, but also displays the current audio sampling rate and Bluetooth format.
*Bluetooth format indicator: SBC: Blue, AAC: Cyan, aptX HD: Yellow, aptX: Purple, aptX LL: Purple, LDAC: White, aptX Adaptive: Green

Professional PEQ - For what you love
With the FiiO Control app, you can quickly switch between 7 preset music styles on the FiiO K9 AKM. If the selected tuning style matches the music you are listening to, you can have a more lively and enjoyable experience. If the preset tuning style is not to your liking, the 3 self-defined PEQ (Parametric Equaliser) designs will help you fine-tune it to your preferred listening style. *This function is only valid for Bluetooth decoding.

To show off your skills - one app is enough
You can connect the K9 to your phone via Bluetooth, and with the additional FiiO Control App you get access to even more features. Customise various settings such as filters, status indicators, EQ and channel balance exactly to your taste. *EQ only works in Bluetooth mode.

Multiple intelligent protection systems - always ready for use
Three intelligent protection systems - overheat protection, overload protection and DC protection - ensure that the K9 always delivers energised music without wearing itself out. With the K9 you can listen worry-free!

Immerse yourself in fabulous music
Connection via USB cable to a desktop or notebook computer Connection to a phone via a USB-B to Type-C cable Connection to a phone, tablet, etc. via Bluetooth Connection to a desktop digital player Connection to external amplifiers or powered speakers

Basic specifications
DAC: AK4191EQ + AK4499EX
Decoding chip: XMOS XUF 208
Amplifier: Two THX AAA 788+
Bluetooth chip: QCC5124, Bluetooth 5.1 Bluetooth format support: LDAC/atpX Adaptive/aptX HD/aptX/aptX LL/AAC/SBC
Outputs: 6.35mm/4.4mm/XLR-4/RCA/XLR
Inputs: USB/OPT/COAX/RCA/4.4mm
Output power 1: L+R≥2000mW+2000mW (32Ω balanced/THD+N＜1%)
Output power 2: L+R≥780mW+780mW (300Ω balanced/THD+N＜1%) SNR: ≥124dB (A-weighted, UAC)
Noise floor: PO＜4.8μV (A-weighted, UAC); BAL＜9.3μV (A-weighted, UAC)
Output impedance: ＜1Ω (32Ω load)
Weight: approx. 2660g
Dimensions: 200x224.5x72mm (without feet)
Comprehensive accessories K9*1, mains cable*1, headphone plug adapter*1, USB data cable*1, feet*6, fuse*1, stand*1, quick start guide*1, voltage selection card*1