FiiO K9 PRO Desktop DAC/Amp (Apos Certified) – Apos Audio
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FiiO flagship with a collector’s chip The FiiO K9 Pro is FiiO’s 2021 flagship DAC/Amp. Featuring a legendary DAC chip and an utterly elegant body, this is a desktop combo that sounds even better than it looks. Collector’s AKM AK4499 DAC chip The K9 Pro uses a legendary AKM AK4499 DAC chip, renowned in the audio industry for its exceptional performance. It supports up to 384kHz and native DSD256 audio. Exemplary THX AAA Amp The THX AAA 788+ chip used in the K9 Pro provides exemplary details and dynamics for both low and high-impedance headphones. The K9 Pro can output up to 46Vpp transients when driving high-impedance loads, and up to an undistorted 2W when pushing low-impedance loads. Compared to the original, the output power of the K9 Pro has increased by more than 50% with higher heat dissipation efficiency.
FiiO flagship with a collector’s chip
The FiiO K9 Pro is FiiO’s 2021 flagship DAC/Amp. Featuring a legendary DAC chip and an utterly elegant body, this is a desktop combo that sounds even better than it looks.
Collector’s AKM AK4499 DAC chip
The K9 Pro uses a legendary AKM AK4499 DAC chip, renowned in the audio industry for its exceptional performance. It supports up to 384kHz and native DSD256 audio.
Exemplary THX AAA Amp
The THX AAA 788+ chip used in the K9 Pro provides exemplary details and dynamics for both low and high-impedance headphones. The K9 Pro can output up to 46Vpp transients when driving high-impedance loads, and up to an undistorted 2W when pushing low-impedance loads. Compared to the original, the output power of the K9 Pro has increased by more than 50% with higher heat dissipation efficiency.
Dual femtosecond clocks
Using an ultra-precise clock management system, the K9 Pro can maintain maximum quality no matter the source. Dual asynchronous femtosecond clocks are used to decode USB and Bluetooth sources, while automatic PLL clocks are used to decode optical and coaxial sources.
Hi-res Bluetooth
The K9 Pro employs the Qualcomm QC5124 to handle Bluetooth duties, with support for formats such as LDAC, aptX HD and aptX Adaptive. This chip ensures that Bluetooth connections are both reliable and quick, satisfying both the low latency needs for games/videos and the high bitrate necessary for high resolution audio.
Flawless volume adjustment
The volume knob may seem like a pretty simple component of an amp, but executing it well is crucial to the listening experience. The ADC curve reconstruction method of volume adjustment used in the K9 Pro effectively minimizes any left-right channel volume imbalance and noise. It also results in a smooth change of volume across all levels.
3-way gain adjustment
Switch between low, medium, and high gain to accommodate your entire headphone library. Thanks to a pure hardware gain circuit, the K9 Pro maintains the dynamic range and fidelity of your music even while amplifying high-sensitivity headphones at low gain.
Utterly elegant UI
Controls are clearly and intuitively laid out for an effortless experience. Metal switches are used for controlling input selection and gain level.
Light it up
The RGB indicator lights surrounding the stainless steel volume knob change colors depending on the currently playing sample rate.
Take control
Built-in Bluetooth low energy technology allows you to use the FiiO Control App to control functions like channel balance, sleep timer at any time, even when not in Bluetooth mode.
Product highlights
Collector’s AKM AK4499 DAC chip
THX-AAA 788+ tech
Dual femtosecond clocks
Qualcomm QCC5124
Supports LDAC, aptX adaptive, aptX HD
App control
Truly balanced design
Dual voltage linear transformer
Wide connector selection
Lossless MQA decoding
Bluetooth format indicator
Specs
DAC chip: AKM AK4499
USB chip: XMOS XUF208
Bluetooth chip: Qualcomm QCC5124
Amp: THX-AAA 788+
Gain: L/M/H
Supported Bluetooth codecs: AAC, SBC, aptX, aptX LL, atpX HD, LDAC, aptX adaptive
Maximum supported sampling rates
USB DAC: 32-bit/384kHz, DSD256
Coaxial: 24-bit/192kHz
Optical: 24-bit/96kHz
Recommended headphone impedance: 16-600Ω
USB: Type-C, USB B (data transmission)
Inputs: RCA, 4.4mm balanced, optical
Outputs: 4.4mm balanced, XLR, 6.35mm, RCA
Weight: 6lbs (2750g)
Single-ended lineout parameters
THD+N: 0.0007%
SNR: ≥123dB
Crosstalk: ≥110dB
Noise floor: <1.9uV
Frequency response: 20Hz - 20kHz
Line level: 2.5Vrms
Balanced line out performance parameters:
THD+N: 0.0004%
SNR: ≥128dB
Crosstalk: ≥123dB
Noise floor: <1.9uV
Frequency response: 20Hz - 20kHz
Line level: 5Vrms
Single-ended headphone output parameters:
Continuous undistorted output power 1: ≥1.1W (16Ω/ THD+N< 1%, Aux in)
Continuous undistorted output power 2: ≥2W (32Ω/THD+N< 1%, Aux in)
Continuous undistorted output power 3 : ≥278mW (300Ω/ THD+N< 1%, Aux in)
Output impedance: <1Ω
Crosstalk: ≥75dB
THD+N: <0.0005%
Noise floor: <2uV
SNR: ≥123dB
Frequency response: 20Hz - 20kHz
Max output voltage: >26Vp-p
Balanced headphone output parameters
Continuous undistorted output power: ≥1.1W
Output impedance: <1Ω
Continuous undistorted output power 2: ≥W (32Ω / THD+N < 1%, Aux in)
Continuous undistorted power 3: ≥1.1W (300Ω/ THD+N <1%, Aux in)
Noise floor: <3uV
Frequency response: 5Hz - 50kHz
Output impedance: <1Ω
Crosstalk: ≥114dB (1kHz, Aux in)
THD+N: <0.0004%
SNR: ≥123dB
Max output voltage: >51Vp-p
What pairs well
Apos Caspian Open-Back Headphone
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