Fosi Audio K7

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It has been a while since I reviewed a DAC. In recent years, portable DACs seem to have become popular, but I am a die-hard speaker fan. I don’t mind headphones, but for all-day use, I much prefer playing music or games with my speakers. I have, therefore, always favoured desktop DACs that have the flexibility of a speaker and headphones.

I am particularly fond of a desktop DAC with easy-to-access controls, in particular, a big volume knob, so I can easily dial down the volume when needed. For the past few years, the FiiO K5 Pro has been my DAC of choice.

It may not be a very high-end DAC, but it has served me well.

Recently, Fosi Audio got in touch and asked if I would like to review their new K7 DAC, which is due to be made available on Kickstarter before its full release.

Specification

Fosi Audio K7 Review
  • Chipset: XMOS XU208+AKM4493SEQ+ QCC 30301+ TPA6120
  • Maximum Sampling Rate: USB: PCM 384kHz-32-Bit/DSD256, Optical: PCM 24-Bit/192kHz, Coaxial: PCM 24-Bit/192kHz, Bluetooth: PCM 24-Bit/48kHz
  • Headphone Impedance: 16-300Ω
  • Input: Coaxial, Optical, USB-C, Bluetooth, 3.5mm Microphone
  • Output: RCA, 3.5mm Single-Ended, 4.4mm Balanced
  • Firmware Upgrade: XMOS firmware can be updated via the Type-C interface
  • Bluetooth Version: 5.0
  • Bluetooth Connection Distance: ≤13m (around 39 ft.)
  • Bluetooth Transmission Audio Format: SBC, AAC, aptX, aptX HD, aptX LL
  • Input Voltage Current: DC 12V 2A
  • USB Compatible Devices: Windows 7, 8, 8.1, 10, 11 (Driver Required), Mac OS X, Linux (No driver required)

Features

The Fosi Audio K7 is a versatile gaming and HiFi DAC/headphone amplifier designed to meet the needs of both audiophiles and gamers. Its key features include:

  • High-Resolution Audio Support: The K7 supports PCM sampling rates up to 384kHz and DSD256, ensuring high-fidelity audio reproduction.
  • Multiple Digital Inputs: It offers USB, optical, and coaxial inputs, providing flexibility in connecting various digital sources.
  • Bluetooth Connectivity: Equipped with the Qualcomm QCC3031 Bluetooth chip, the K7 supports aptX HD, aptX LL, aptX, AAC, and SBC codecs, delivering high-quality wireless audio with low latency.
  • Balanced and Single-Ended Outputs: The device features a 4.4mm balanced headphone output with a rated power of ≥2.1W+2.1W @32Ω, and a 3.5mm single-ended headphone output with a rated power of ≥600mW+600mW @32Ω, accommodating a wide range of headphones.
  • Microphone Input with Noise Reduction: A 3.5mm microphone input is included, featuring intelligent noise reduction to ensure clear communication during online gaming or calls.
  • User-Friendly Design: The K7 boasts a 1.5-inch OLED high-definition display, tactile shortcut buttons, and multi-functional pressable knobs, all housed in an all-aluminum alloy body with a CNC integrated design for durability and aesthetics.
  • Low Distortion and High Output Power: With a total harmonic distortion plus noise (THD+N) as low as 0.0002% and a signal-to-noise ratio (SNR) of up to 122dB, the K7 delivers clear and powerful audio performance.
  • Comprehensive Compatibility: The K7 is compatible with devices such as PS5 Pro, PS5, Switch, PC, Mac, tablets, TVs, and projectors, making it suitable for various applications including music listening, gaming, work, live streaming, and multimedia use.

Audiophile Grade Chipset

The K7 is designed with a high-performance chipset configuration, offering reliable performance for gaming and audio applications. It integrates advanced technologies to deliver precise audio reproduction, ensuring an immersive experience for users.

AKM AK4493S Digital-to-Analogue Converter (DAC)

  • High-Resolution Audio: The AK4493S DAC is engineered to deliver high-resolution and low-distortion sound output.
  • Gaming Performance: It accurately reproduces in-game audio cues, such as footsteps and explosions, enhancing situational awareness in competitive gaming environments.
  • Music Playback: The chipset provides studio-quality audio with a wide dynamic range and rich detail, making it suitable for music enthusiasts.

XMOS XU208 Digital Signal Processor (DSP)

  • High-Speed Processing: The XMOS XU208 enables rapid digital audio processing to ensure synchronisation between visuals and sound during gaming sessions.
  • Signal Integrity: It supports distortion-free audio transmission, preserving signal purity for precise music reproduction.
  • Immersive Experience: Users benefit from accurate sound effects and seamless integration of audio and video for improved gameplay and multimedia enjoyment.

OPA1612 Operational Amplifier

  • Enhanced Positional Accuracy: The OPA1612 improves spatial awareness in games by providing clear and precise positional audio.
  • Low-Distortion Output: It delivers low-distortion sound and supports high-fidelity audio playback.
  • Dynamic Range: The amplifier captures subtle details and dynamic nuances, making it suitable for both gaming and music applications.

TPA6120 Headphone Amplifier

  • Powerful Headphone Drive: The TPA6120 ensures optimal performance for headphones, regardless of impedance levels.
  • Versatile Compatibility: It supports both low-impedance and high-impedance HiFi headphones, unlocking their full potential.
  • Enhanced Sound Quality: Users can experience clearer, more detailed sound for both gaming and music playback.

Qualcomm QCC3031 Bluetooth Processor

  • Low-Latency Audio: Supports aptX LL (Low Latency) technology to deliver synchronised audio and video, making it ideal for gaming applications.
  • High-Quality Wireless Audio: Provides aptX HD support for lossless audio, offering near-wired sound quality for wireless listening.
  • Seamless Connectivity: Ensures reliable and stable Bluetooth performance for uninterrupted music and gaming sessions.

Inputs

  • Bluetooth
    • Equipped with the Qualcomm QCC3031 Bluetooth chip, supporting aptX HD, aptX LL, aptX, AAC, and SBC codecs.
    • Under 40 ms imperceptible latency
    • Lossless PCM 24bit/48kHz Sampling Rate
  • Optical Input
  • Coaxial Input
  • USB-C Input

Outputs

4.4mm Balanced Headphone Output
ParameterSpecification
Rated Power OutputL+R ≥ 2100mW + 2100mW (32Ω/THD+N < 1%)
SNR121dB
THD+N< 0.0002%
Dynamic Range121dB
Noise Floor≤ 6.5μV
3.5mm Single-Ended Headphone Output
ParameterSpecification
Rated Power OutputL+R ≥ 600mW + 600mW (32Ω/THD+N < 1%)
SNR122dB
THD+N0.00%
Dynamic Range121dB
Noise Floor≤ 2.5μV
Frequency Response20Hz – 20kHz (±0.1dB)
RCA Output
ParameterSpecification
Output Level≥ 2Vrms
SNR20Hz – 20kHz (±0.1dB)
THD+N0.00%
Dynamic Range121dB
Noise Floor≤ 3μV
Frequency Response20Hz – 20kHz

Unboxing / Design

Fosi Audio K7 Review 2

The Fosi Audio K7 adopts a very different design than the K5. All the controls are now located on the top of the DAC with an LCD centrally located with a volume knob on the left and then a control knob on the right for the various EQ and microphone adjustments.

Fosi Audio K7 Inputs and Outputs

It has 5 buttons across the top panel for different functions, such as powering it on/off, switching inputs/outputs and adjusting the settings.

Fosi Audio K7 Headphone Output

On the front are the headphone outputs and microphone input, and on the rear are the power input, USB-C/optical/Coaxial input, an antenna for Bluetooth input, then the RCA output.

The overall design is functional and after playing around with the buttons, it is quite simple to use

Test Set Up

I tested these with a selection of headphones, including:

I used the EPOS headphones for the microphone both for gaming and when at work using it with the 3CX softphone.

Additionally, I used the RCA output and connected it to my Edifier S3000 Pro speakers.

For the vast majority of my testing, I used the USB-C input from my PC for the K7.

I also tested the Bluetooth using my Pixel 9 Pro XL and the Honor Magic 6 Pro.

Fosi Audio K7 Review 6

Performance

Fosi Audio K7 Output

When used as a headphone amplifier, the K7 provides ample power to drive most headphones. It offers a relatively neutral sound signature, which should appeal to those who prefer an accurate representation of their audio content. The bass response is tight and controlled, while the midrange is clear and well-defined. The treble is crisp without being harsh, although some users might find it slightly bright with certain headphones.

The K7’s performance with gaming audio is particularly noteworthy. It provides clear and detailed sound, which can enhance the gaming experience by making it easier to locate in-game audio cues. The wide soundstage also contributes to a more immersive gaming experience.

When using the line outputs to connect to powered speakers, the K7 maintains its clean and detailed sound character. However, as with any DAC, the final sound quality will also depend on the quality of the speakers or amplifier you’re using.

Gaming Performance

For gamers, the Fosi Audio K7 offers several features that enhance the gaming experience. The high-resolution audio support ensures that you can hear game audio with excellent clarity and detail. This can be particularly beneficial in competitive gaming scenarios where audio cues are crucial.

The optical input is a valuable feature for console gamers, allowing direct connection to PlayStation or Xbox consoles for high-quality digital audio. The USB input is equally useful for PC gamers, providing a simple plug-and-play solution.

The microphone input on the front panel is another gaming-friendly feature. It allows you to use a separate microphone for in-game communication, which can be particularly useful if you prefer using audiophile headphones that don’t come with a built-in microphone.

However, it’s worth noting that the K7 doesn’t offer any virtual surround sound processing. While this ensures a more accurate audio representation, some gamers might miss the expanded soundstage that virtual surround can provide in certain games.

Microphone Performance

Ease of Use

The Fosi Audio K7 is designed to be user-friendly. It’s largely a plug-and-play device, requiring minimal setup in most cases. For USB connections, most operating systems will recognise the K7 automatically without the need for additional drivers.

Price and Alternative Options

At the time of writing, I have not been told the price of the Fosi Audio K7 Gaming Headphone Amp/DAC.

The Fosi Audio K5 Pro is currently available on Amazon for £80.

The FiiO K5 Pro still commands a price of £150. There is also the FiiO 11 for £130.

I like the Creative Sound Blaster X4 and this is available for under £100 with the on-page voucher on Amazon.

Topping is another popular, affordable option for DACs. The Topping DX1 is available for £99.

Overall

The Fosi Audio K7 is a capable and versatile DAC/headphone amplifier that offers good value for money. It’s particularly well-suited for gamers looking to upgrade their audio setup, thanks to its optical input and microphone support. The device also performs well for general music listening, making it a good all-rounder for those who want to improve their audio experience without spending a fortune.

While it may not satisfy the most demanding audiophiles, the K7 provides a noticeable step up from basic audio solutions. Its ability to drive a wide range of headphones, support for high-resolution audio, and multiple connectivity options make it a flexible choice for various setups.

The build quality and design are impressive for the price point, although some minor usability issues like the lack of an input selector switch might be inconvenient for some users.

Overall, if you’re a gamer or casual audio enthusiast looking for an affordable way to improve your sound quality, the Fosi Audio K7 is definitely worth considering. It offers a good balance of features, performance, and value that should satisfy most users’ needs.

Fosi Audio K7 Review

Summary

The Fosi Audio K7 is a solid performer in the budget DAC/headphone amplifier market. It offers a good balance of features, performance, and affordability that should appeal to a wide range of users, particularly gamers and casual audio enthusiasts.

Overall
85%
85%
  • Overall - 85%
    85%

Pros

  • Versatile connectivity options, including optical input
  • Good audio quality for the price
  • Supports high-resolution audio formats
  • Can drive a wide range of headphones
  • Solid build quality with aluminium construction
  • Compact and stylish design
  • Includes a microphone input, useful for gamers

Cons

  • Lacks virtual surround sound processing for gaming

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