The Fosi Audio K7 Desktop DAC & Headphone Amplifier delivers high-resolution audio with an AKM AK4493SEQ DAC, 32-bit/384kHz PCM and DSD256 support, and powerful 4.4mm balanced headphone amplification. Featuring USB-C, optical, coaxial, Bluetooth 5.0, and RCA connectivity, it provides a versatile solution for music listening, gaming, and desktop Hi-Fi systems. With adjustable bass and treble, microphone support, and a premium aluminum chassis, the K7 combines audiophile-quality performance with convenient everyday controls.
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Fosi Audio K7 Desktop DAC & Headphone Amplifier

Upgrade your desktop audio experience with the Fosi Audio K7 Desktop DAC & Headphone Amplifier, a versatile all-in-one solution designed for high-fidelity music listening, gaming, and everyday entertainment. Combining a premium AKM AK4493SEQ DAC, XMOS XU208 USB processor, and powerful headphone amplification, the K7 delivers detailed, low-distortion sound with support for high-resolution PCM audio up to 32-bit/384kHz and native DSD256. With up to 2,100mW per channel through its 4.4mm balanced headphone output, the K7 provides the power and precision needed to drive a wide range of headphones while maintaining excellent clarity and dynamic performance.

Designed to serve as the centerpiece of a modern desktop audio system, the K7 offers USB-C, optical, coaxial, and Bluetooth 5.0 connectivity with support for aptX HD and aptX Low Latency. A dedicated 3.5mm microphone input with noise reduction makes it equally useful for online gaming, voice chat, and communication. Choose between 3.5mm single-ended and 4.4mm balanced headphone outputs, or connect powered speakers and external amplifiers using the RCA line outputs. Compatible with PCs, Macs, PlayStation consoles, Nintendo Switch, and other supported digital audio devices, the K7 brings flexibility to nearly any listening environment.

Built around a fully balanced circuit design, the Fosi Audio K7 achieves exceptionally low distortion while incorporating high/low gain settings, adjustable bass and treble controls, and an EQ bypass mode for a more direct listening experience. Its precision-machined aluminum alloy chassis features an angled ergonomic design, two large multifunction control knobs, dedicated shortcut buttons, and a 1.5-inch display that provides clear information about playback formats, inputs, and settings. Whether you're enjoying high-resolution music, competing in your favorite game, or building a compact desktop Hi-Fi system, the K7 combines powerful performance with convenient everyday operation.

Specifications

• Brand: Fosi Audio
• Model: K7
• Product Type: Desktop DAC, headphone amplifier, and gaming audio interface
• DAC Chip: AKM AK4493SEQ
• USB Audio Processor: XMOS XU208
• Bluetooth Chip: Qualcomm QCC3031
• Headphone Amplifier Chip: TPA6120
• Circuit Design: Fully balanced audio circuitry with low-noise LDO voltage regulators
• USB Audio Resolution: Up to 32-bit/384kHz PCM and DSD256
• Optical Audio Resolution: Up to 24-bit/192kHz PCM
• Coaxial Audio Resolution: Up to 24-bit/192kHz PCM
• Bluetooth Audio Resolution: Up to 24-bit/48kHz PCM
• Digital Audio Inputs: USB-C, optical, coaxial, Bluetooth
• Microphone Input: 3.5mm microphone connection with noise reduction
• Headphone Outputs: 3.5mm single-ended and 4.4mm balanced
• Line Output: Stereo RCA
• Supported Headphone Impedance: 16–300 ohms
• Balanced Headphone Output Power: At least 2,100mW per channel at 32 ohms, THD+N below 1%
• Balanced Output Signal-to-Noise Ratio: 121dB (A-weighted)
• Balanced Output THD+N: Less than 0.0002% (A-weighted)
• Balanced Output Dynamic Range: 121dB
• Balanced Output Noise Floor: 6.5µV or less (A-weighted)
• Balanced Output Frequency Response: 20Hz–20kHz (±0.2dB)
• Single-Ended Headphone Output Power: At least 600mW per channel at 32 ohms, THD+N below 1%
• Single-Ended Output Signal-to-Noise Ratio: 122dB (A-weighted)
• Single-Ended Output THD+N: 0.0005% (A-weighted)
• Single-Ended Output Dynamic Range: 121dB
• Single-Ended Output Noise Floor: 2.5µV or less (A-weighted)
• Single-Ended Output Frequency Response: 20Hz–20kHz (±0.2dB)
• RCA Output Level: At least 2Vrms
• RCA Signal-to-Noise Ratio: 121dB (A-weighted)
• RCA THD+N: 0.0005% (A-weighted)
• RCA Dynamic Range: 121dB
• RCA Noise Floor: 3µV or less (A-weighted)
• RCA Frequency Response: 20Hz–20kHz (±0.2dB)
• Bluetooth Version: 5.0
• Bluetooth Audio Codecs: SBC, AAC, aptX, aptX HD, aptX Low Latency
• Bluetooth Wireless Range: Up to 13 meters under suitable conditions
• Gain Settings: High and low headphone gain
• Tone Controls: Adjustable bass and treble
• EQ Bypass: Direct-signal mode bypasses internal bass and treble adjustments
• Microphone Functions: Adjustable microphone volume and mute support in USB Audio Class 1.0 mode
• USB Audio Modes: UAC 1.0 and UAC 2.0
• UAC 1.0 Audio: 16-bit/48kHz with microphone communication support
• Display: 1.5-inch high-resolution status display
• Controls: Dual multifunction knobs, input/output selection, power/UAC selection, tone/microphone adjustment, and EQ bypass controls
• Display Information: Input source, output mode, PCM/DSD format, sampling rate, Bluetooth codec, EQ settings, and microphone status
• Chassis: CNC-machined aluminum alloy with an angled desktop design
• Computer Compatibility: Windows, macOS, and Linux
• Gaming Compatibility: Compatible with supported PlayStation and Nintendo Switch USB audio connections
• USB Driver Requirements: Standard PCM playback is plug-and-play on supported modern Windows and macOS systems; drivers may be required for older Windows versions or DSD playback
• Firmware Updates: XMOS firmware updates supported through USB-C
• Power Requirement: DC 12V/2A
• Included Accessories: USB-A/C to USB-C cable, Bluetooth antenna, Y-splitter cable, 12V power adapter, and user manual

What It's Great At

• High-Resolution Music Playback: The AKM AK4493SEQ DAC and XMOS XU208 processor support PCM up to 32-bit/384kHz and DSD256, delivering detailed digital-to-analog conversion for high-quality music listening.
• Powerful Balanced Headphone Amplification: Delivering at least 2,100mW per channel at 32 ohms through its 4.4mm balanced output, the K7 provides substantial amplification for demanding wired headphones.
• Versatile Desktop Connectivity: USB-C, optical, coaxial, Bluetooth, dual headphone outputs, and RCA connections make the K7 an adaptable centerpiece for music, gaming, and desktop audio systems.
• Gaming and Voice Communication: The dedicated 3.5mm microphone input, noise reduction, microphone volume adjustment, and UAC 1.0 compatibility support clear communication during compatible gaming and voice-chat applications.
• Customizable Sound and Convenient Controls: Adjustable bass, treble, headphone gain, and EQ bypass settings allow listeners to tailor playback without relying on complicated software menus.
• Premium Desktop Design: A durable aluminum chassis, angled control surface, multifunction knobs, and 1.5-inch display combine modern aesthetics with practical everyday operation.

FAQ Section

Q: What is the Fosi Audio K7 used for?
A: The Fosi Audio K7 is a desktop digital-to-analog converter and headphone amplifier designed for high-resolution music playback, gaming, and general computer audio. It can power wired headphones, receive audio from multiple digital sources, and connect to powered speakers or external amplifiers through RCA outputs.

Q: Can the Fosi Audio K7 drive high-impedance headphones?
A: Yes. The K7 supports headphones with impedances ranging from 16 to 300 ohms and provides up to at least 2,100mW per channel at 32 ohms through its balanced output. Its high and low gain settings help accommodate headphones with different amplification requirements.

Q: Does the Fosi Audio K7 support balanced headphones?
A: Yes. The K7 features a dedicated 4.4mm balanced headphone output and a standard 3.5mm single-ended output. The balanced connection offers substantially higher rated output power when used with compatible headphones and a properly wired balanced cable.

Q: Does the Fosi Audio K7 support Bluetooth audio?
A: Yes. The K7 features Bluetooth 5.0 with support for SBC, AAC, aptX, aptX HD, and aptX Low Latency codecs. It can receive wireless audio from compatible smartphones, tablets, and computers for playback through connected wired headphones or an external audio system.

Q: Can I connect the Fosi Audio K7 to a PlayStation or Nintendo Switch?
A: Yes. The K7 supports compatible PlayStation and Nintendo Switch USB audio connections using USB Audio Class 1.0 mode. This mode also supports microphone communication at 16-bit/48kHz with the appropriate headset or microphone connections.

Q: Can I connect powered speakers to the Fosi Audio K7?
A: Yes. The K7 includes stereo RCA line outputs for connecting powered speakers, integrated amplifiers, or other compatible audio equipment. Use the output selector to switch between headphone playback and RCA line output.

Q: Can I adjust the bass and treble on the Fosi Audio K7?
A: Yes. The K7 features adjustable bass and treble controls for customizing your listening experience. An EQ bypass function allows you to disable the tone adjustments when you prefer a more direct audio signal.

Q: Does the Fosi Audio K7 require drivers to work with a computer?
A: Standard PCM playback is plug-and-play with supported modern Windows and macOS computers. Certain older Windows operating systems or DSD playback configurations may require additional drivers. The K7 also supports USB Audio Class 1.0 and 2.0 modes for different playback and compatibility requirements.