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Here is our review of the Fosi Audio K7 Desktop DAC Headphone Amplifier.

Build the heart of your desktop audio setup with the Fosi Audio K7, a DAC and headphone amplifier designed for audiophiles, music lovers and gamers alike. Enjoy high-resolution decoding up to PCM 384kHz/32-bit and DSD256, powered by an AKM AK4493SEQ DAC and an XMOS XU208 USB processor for clean, detailed sound with a 121dB signal-to-noise ratio.

Drive even demanding headphones with dual TI TPA6120 amplifiers delivering up to 2100mW per channel, and tailor the sound to whatever you are doing with dedicated bass and treble knobs or a pure Bypass mode. Gamers get a 3.5mm microphone input with independent volume control and one-tap mute, plus a UAC 1.0 mode for PS5 and Nintendo Switch.

With USB-C, optical, coaxial and Bluetooth aptX HD/LL inputs, 4.4mm balanced, 3.5mm and RCA outputs, a 1.5-inch display and a solid aluminium alloy chassis angled at 5° for easy use, the K7 fits neatly into any desk setup.

• Decode PCM 384kHz & DSD256 Audio
• Support USB-C, Bluetooth & Mic Inputs
• Simplify Control with Dual Knobs

• Versatile DAC Amp: The K7 is designed for both HiFi headphone audiophiles and music lovers. It can serve as a powerful hub for building your desktop audio system. Whether your’re enjoying music, gaming or working, the K7 handles it all with ease.
  
• Audiophile-Grade Chipset: Equipped with the AK4493S DAC, XMOS XU208 USB processor, and TPA6120 headphone amps, the K7 supports high-resolution decoding up to PCM 384kHz/32bit and DSD256. With up to 2100mW output power, it easily drives demanding headphones.
  
• Comprehensive Connectivity: Supports USB-C, coaxial, optical, Bluetooth aptX HD/LL and 3.5mm microphone input. Outputs include 4.4mm balanced, 3.5mm single-ended, and RCA—easily connecting to headphones, powered speakers, or amplifiers for desktop setups.
  
• User-Centric Design: Compact yet user-friendly, the K7 features dual large control knobs, five shortcut buttons, and an angled chassis for ergonomic comfort. A high-resolution display shows real-time status, making operation easy and intuitive.
  
• Durable All-Metal Build: Crafted from solid aluminum alloy, the K7 features a rugged, wear-resistant chassis with a sleek metallic finish and enhanced electromagnetic interference shielding.

The box contains the Fosi Audio K7, USB-A/C to USB-C Cable, Bluetooth Antenna, Y-Splitter Cable, DC 12V Power Supply and a User Manual.

The K7 is a lot more compact than you might expect and it sits really nicely on a desk. The all-aluminium chassis feels very solid and well made, and the slight 5° angle means you can easily see the screen and reach the controls without having to lean over.

Setting the K7 up is really straightforward. Plug it in, connect it to your PC or Mac with the supplied USB cable and you are pretty much good to go. If you want to use it with a PS5 or Nintendo Switch you just change over to the UAC 1.0 mode and it works without any fuss.

There are plenty of connection options – USB-C, optical, coaxial and Bluetooth with aptX HD and aptX Low Latency – so you can hook up pretty much anything, from your computer to your TV to your phone. Bluetooth pairing is quick and simple and it is handy for when you just want to stream some music from your phone.

You also get a choice of 4.4mm balanced and 3.5mm outputs for your headphones as well as RCA outputs, so you can use the K7 to feed a pair of powered speakers or an amplifier too.

The sound quality is excellent, with music coming through clean and detailed no matter what you are listening to, and there is no background hiss or noise to spoil things. With up to 2100mW on tap there is plenty of power and the K7 has no problem driving harder-to-drive headphones.

The bass and treble knobs are a really nice touch – you can quickly add a bit more punch or brighten things up without having to dig through any software, and if you want the sound exactly as it was intended you can just switch to Bypass mode.

Gamers are well looked after too. You can plug in a headset microphone, adjust its level independently and mute it with a single tap, and the 1.5-inch display shows you exactly what is going on at a glance.

The Fosi Audio K7 Desktop DAC Headphone Amplifier is available now priced around £189.99 and comes in either Black or Satin Silver.

You can learn more from the Fosi Audio website here.