Fosi Audio K7 AKM DAC Audio Decoder

Fosi Audio K7 AKM DAC Audio Decoder – Compact Flagship HiFi Hub with Balanced Power and Precision Sound

The Fosi Audio K7 AKM DAC Audio Decoder is a compact yet highly powerful desktop HiFi audio solution designed for audiophiles, gamers, and professional listeners who demand high-resolution sound quality and versatile connectivity. Manufactured by Fosi Audio and distributed by Audio Phonic, the K7 integrates a premium AKM DAC, XMOS USB processor, high-power headphone amplifier, and advanced Bluetooth connectivity into a single all-in-one audio hub.

Built with fully balanced circuitry and ultra-low distortion architecture, the K7 delivers clean, precise, and dynamic sound reproduction. It supports multiple input sources including USB-C, optical, coaxial, Bluetooth, and microphone input, making it a complete desktop audio center for music, gaming, and multimedia applications.

With support for high-resolution PCM up to 384kHz and DSD256 playback, combined with powerful headphone amplification and intelligent protection systems, the Fosi Audio K7 is designed for users who want studio-level sound performance in a compact form factor.

Key Features of Fosi Audio K7 AKM DAC Audio Decoder

Premium AKM4493SEQ DAC and XMOS XU208 Processor

At the heart of the Fosi Audio K7 lies the AKM4493SEQ DAC chip combined with the XMOS XU208 USB audio processor.

This powerful combination delivers:

• High-resolution audio decoding

• Accurate digital-to-analog conversion

• Low distortion sound reproduction

• Natural and smooth tonal balance

• Stable and high-speed USB audio transmission

Together, these chips ensure detailed, transparent, and immersive sound performance suitable for audiophile-grade listening.

High-Resolution Audio Format Support

The K7 supports a wide range of high-resolution audio formats for superior listening quality.

Supported formats include:

USB input:

• PCM up to 32-bit / 384kHz

• DSD256

Optical input:

• PCM up to 24-bit / 192kHz

Coaxial input:

• PCM up to 24-bit / 192kHz

Bluetooth input:

• PCM up to 24-bit / 48kHz

This ensures compatibility with both modern digital music libraries and traditional audio sources.

Hi-Res Bluetooth Connectivity with Qualcomm QCC3031

The Fosi Audio K7 is equipped with the Qualcomm QCC3031 Bluetooth chip, offering stable wireless audio transmission.

Supported Bluetooth codecs include:

• aptX HD

• aptX Low Latency (LL)

• aptX

• AAC

• SBC

Benefits include:

• High-quality wireless audio streaming

• Low latency for gaming and video playback

• Stable connection up to 13 meters

• Easy smartphone pairing

This makes it ideal for both entertainment and productivity use cases.

Fully Balanced Circuit Design with Ultra-Low Distortion

The K7 uses a fully balanced audio architecture designed to minimize noise and distortion.

Performance highlights:

• THD+N: <0.0002% (balanced output)

• Noise floor: as low as 2.5μV

• Dynamic range: 121dB

• SNR: up to 122dB

Benefits include:

• Clean background audio

• Enhanced stereo separation

• Improved soundstage width

• Highly accurate sound reproduction

This ensures professional-grade audio clarity for all listening environments.

Powerful Dual Headphone Amplifier System

The Fosi Audio K7 features two dedicated headphone outputs designed for different listening needs.

4.4mm Balanced Output:

• 2100mW + 2100mW @32Ω

• Extremely powerful output

• Wide dynamic range

• Enhanced soundstage and detail

3.5mm Single-Ended Output:

• 600mW + 600mW @32Ω

• Clean and controlled sound

• Suitable for most headphones

This dual-output design ensures compatibility with both high-end audiophile headphones and everyday listening devices.

Comprehensive Input and Output Connectivity

The K7 is designed as a complete desktop audio hub with extensive connectivity options.

Inputs include:

• USB-C input

• Coaxial input

• Optical input

• Bluetooth input

• 3.5mm microphone input

Outputs include:

• 4.4mm balanced headphone output

• 3.5mm single-ended output

• RCA line output

This allows seamless integration with:

• PCs and laptops

• Gaming consoles

• Smartphones

• Active speakers

• Headphones and amplifiers

Intelligent Triple Protection System

The K7 is equipped with advanced safety mechanisms to ensure stable and reliable performance.

Protection features include:

• Overheat protection

• Overload protection

• Overcurrent protection

These systems ensure:

• Safe long-term usage

• Protection for headphones and speakers

• Stable output performance during heavy use

User-Friendly Display and Control Interface

The Fosi Audio K7 features a 1.5-inch LCD display with an intuitive control system.

Design highlights:

• High-definition display for real-time information

• Tactile shortcut buttons

• Multi-functional rotary knob

• Ergonomic angled design

This allows easy navigation and control of all audio settings.

Premium CNC Aluminum Alloy Build

The K7 is built with a full-metal aluminum chassis using CNC machining technology.

Design features:

• Sandblasted aluminum finish

• Compact desktop-friendly design

• Durable and heat-resistant structure

• Premium aesthetic appearance

This ensures both durability and modern HiFi styling.

Low Noise Floor and High Audio Purity

The K7 achieves extremely low noise levels for clean audio reproduction.

Key performance:

• Noise floor: ≤2.5μV

• THD+N: ultra-low distortion levels

• Clean signal processing

This ensures silent backgrounds and detailed music playback.

Technical Specifications of Fosi Audio K7

Chipset Configuration

• DAC Chip: AKM4493SEQ

• USB Processor: XMOS XU208

• Bluetooth Chip: QCC3031

• Headphone Amplifier: TPA6120

Input Options

• USB-C input

• Optical input

• Coaxial input

• Bluetooth input

• 3.5mm microphone input

Output Options

• 4.4mm balanced headphone output

• 3.5mm single-ended headphone output

• RCA output

Audio Resolution Support

USB:

• PCM up to 32-bit / 384kHz

• DSD256

Optical/Coaxial:

• PCM up to 24-bit / 192kHz

Bluetooth:

• PCM up to 24-bit / 48kHz

Bluetooth Specifications

• Bluetooth version: 5.0

• Connection distance: ≤13 meters

• Supported codecs:

  • aptX HD

  • aptX LL

  • aptX

  • AAC

  • SBC

Headphone Output Performance

4.4mm Balanced:

• 2100mW × 2 @32Ω

• SNR: 121dB

• THD+N: <0.0002%

• Noise floor: ≤6.5μV

3.5mm Single-Ended:

• 600mW × 2 @32Ω

• SNR: 122dB

• THD+N: 0.0005%

• Noise floor: ≤2.5μV

RCA Output Performance

• Output level: ≥2Vrms

• Dynamic range: 121dB

• THD+N: 0.0005%

• Noise floor: ≤3μV

Power Requirements

• DC 12V / 2A

Physical Specifications

• Dimensions: 155 × 95 × 55 mm

• Weight: 530g

Sound Performance and Listening Experience

Clean and Transparent Audio Output

The AKM DAC architecture ensures accurate and natural sound reproduction with minimal coloration.

Powerful and Dynamic Headphone Driving

High-power balanced output delivers strong bass control and dynamic impact.

Wide Soundstage and Precise Imaging

Fully balanced design enhances stereo separation and spatial accuracy.

Low-Latency Bluetooth Experience

aptX LL support ensures smooth audio synchronization for gaming and video.

Studio-Grade Audio Clarity

Ultra-low distortion and high SNR provide professional-level sound performance.

Why Choose Fosi Audio K7 from Audio Phonic

Audio Phonic offers authentic HiFi products designed for users who demand performance and reliability. The Fosi Audio K7 is a complete desktop audio solution combining DAC, amplifier, and preamp functionality in one compact device.

Choosing this product ensures:

• Genuine Fosi Audio engineering quality

• High-resolution AKM DAC performance

• Powerful balanced headphone output

• Advanced Bluetooth connectivity

• Compact all-in-one desktop design

It is an ideal choice for audiophiles, gamers, and desktop audio users.

Ideal Applications of Fosi Audio K7

The K7 is suitable for:

• Desktop HiFi audio systems

• Gaming setups

• Studio monitoring environments

• Music production listening stations

• Active speaker systems

• Movie and entertainment setups

Its versatility makes it a powerful all-in-one audio solution.

Setup Guide for Fosi Audio K7

Connect your preferred input source via USB-C, optical, coaxial, Bluetooth, or microphone input. Then connect headphones or speakers using balanced or RCA outputs.

For best performance:

• Use balanced 4.4mm output for high-end headphones

• Enable aptX HD or LDAC for Bluetooth devices

• Adjust gain level based on headphone impedance

• Use high-resolution audio files for best clarity

Setup is simple and plug-and-play.

Maintenance and Usage Tips

To maintain optimal performance:

• Keep device in ventilated area

• Avoid moisture and heat exposure

• Use stable DC 12V power supply

• Clean with soft dry cloth

• Use quality audio cables

Proper care ensures long-term stability and sound quality.

Frequently Asked Questions

Does the Fosi Audio K7 support high-resolution audio?

Yes, it supports PCM up to 384kHz and DSD256.

What DAC chip does it use?

It uses the AKM4493SEQ high-performance DAC chip.

Does it support Bluetooth?

Yes, it supports aptX HD, aptX LL, AAC, and SBC codecs.

Can it drive high-impedance headphones?

Yes, it supports headphones from 16Ω to 300Ω.

Does it have balanced output?

Yes, it includes a 4.4mm balanced output.

Is it suitable for gaming?

Yes, aptX LL and low latency design make it ideal for gaming.

Does it support microphone input?

Yes, it includes a 3.5mm microphone input