- Versatile HiFi and gaming DAC/headphone amplifier with AKM AK4493SEQ chip, supporting PCM up to 32-bit/384kHz and DSD256 for high-resolution audio.
- Powerful headphone output delivering 2100mW per channel at 32 ohms via 4.4mm balanced, suitable for headphones and IEMs from 16 to 300 ohms.
- Comprehensive connectivity with USB-C, optical, coaxial, Bluetooth 5.0 (aptX HD/LL), and 3.5mm microphone input, plus 3.5mm, 4.4mm, and RCA outputs.
- Ultra-low distortion (THD+N <0.0002%) and high SNR (≥121dB) for clean, detailed sound with a noise floor below 6.5μV.
- User-friendly design with dual large knobs, five tactile buttons, and a 1.5-inch LCD for intuitive control and real-time status display.
- Adjustable bass and treble controls with bypass mode, plus high/low gain settings for tailored audio output.
- Built-in noise-canceling microphone input for clear voice communication, ideal for gaming and online calls (USB UAC 1.0 mode only).
- Durable CNC-machined aluminum alloy chassis with a 5° angled design for ergonomic operation and enhanced durability.
Product Overview
The Fosi Audio K7 is a high-performance desktop DAC and headphone amplifier designed to bridge the gap between audiophile-grade music listening and immersive gaming audio. Developed with feedback from over 100 HiFi and gaming enthusiasts, it combines a premium AKM AK4493SEQ DAC chip with a robust TPA6120A2 amplifier, delivering up to 2100mW per channel through its 4.4mm balanced output. Supporting PCM up to 32-bit/384kHz and DSD256 via USB, the K7 ensures pristine audio reproduction for high-resolution music files. Its versatile inputs—USB-C, optical, coaxial, Bluetooth 5.0—and outputs (3.5mm, 4.4mm, RCA) make it a central hub for desktops, gaming consoles like PS5, and other devices. With a noise-canceling microphone input, adjustable tone controls, and an intuitive interface, the K7 caters to both audiophiles and gamers seeking a compact, powerful solution for music, gaming, and multimedia.
Exceptional Audio Performance
The Fosi Audio K7 is built around the AKM AK4493SEQ DAC chip, paired with an XMOS XU208 USB controller, to deliver high-resolution audio decoding up to PCM 32-bit/384kHz and DSD256 via USB, with optical and coaxial inputs supporting up to 24-bit/192kHz. This setup achieves an ultra-low total harmonic distortion plus noise (THD+N) of <0.0002%, a signal-to-noise ratio (SNR) of ≥121dB, and a dynamic range of ≥121dB, ensuring a clean, detailed soundstage with a noise floor as low as 6.5μV for balanced output. The fully balanced circuitry, enhanced by OPA1612 op-amps and TPA6120A2 amplifier chips, minimizes interference and crosstalk, delivering crystal-clear audio for both music and gaming. Whether you’re enjoying lossless tracks or detecting subtle in-game audio cues, the K7’s audiophile-grade components provide a rich, natural sound that elevates every listening experience.
Powerful Amplification for Diverse Headphones
The K7’s headphone amplifier section is designed to drive a wide range of headphones and in-ear monitors, from 16 to 300 ohms, with ease. The 4.4mm balanced output delivers up to 2100mW per channel at 32 ohms (THD+N <1%), while the 3.5mm single-ended output provides 600mW per channel at 32 ohms. High and low gain settings (+18.7dB and +13.8dB for balanced, +12.6dB and +7.8dB for single-ended) allow precise matching to headphone sensitivity, ensuring optimal performance for sensitive IEMs or power-hungry planar magnetics. The K7’s robust power output ensures dynamic headroom for punchy bass and crisp highs, making it ideal for immersive gaming audio or detailed music playback. Its balanced output enhances soundstage width and channel separation, offering a competitive edge in games and a refined experience for audiophiles.
Versatile Connectivity and Gaming Features
The K7 excels in connectivity, offering USB-C, optical, coaxial, and Bluetooth 5.0 inputs with support for aptX HD, aptX LL, aptX, AAC, and SBC codecs, delivering up to 24-bit/48kHz wireless audio with under 40ms latency. The 3.5mm microphone input, equipped with noise-canceling algorithms, ensures clear voice communication for online gaming or virtual meetings, though it’s limited to USB UAC 1.0 mode (16-bit/48kHz) to avoid conflicts with high-resolution playback. Outputs include 3.5mm single-ended, 4.4mm balanced, and RCA for connecting to external amplifiers or powered speakers. The K7 supports UAC 1.0 for compatibility with gaming consoles like PS5 and Switch, and UAC 2.0 for high-resolution audio on PCs and Macs. This flexibility makes it a versatile hub for desktops, home theater systems, or gaming setups, seamlessly integrating with devices like PCs, TVs, and projectors.
Intuitive Controls and User Experience
Fosi Audio’s K7 keeps everyday control intuitive, with two oversized knurled knobs for volume and tone plus five shortcut buttons for power/UAC, input, output, EQ-bypass and tone-mode; a crisp 1.5-inch OLED screen displays input source, sample rate, volume and mic status in real time; the tone section allows ±12 dB bass and ±6 dB treble adjustment with a bypass option for an uncoloured path; the angled aluminium chassis measures 155 × 95 × 55 mm (≈ 6.1 × 3.74 × 2.17 in), compact enough for desktop use; power is provided by a dedicated 12 V / 2 A adapter to isolate USB noise, while XMOS firmware can be updated via USB-C to ensure future expandability.
Robust Build and Aesthetic Design
Crafted from CNC-machined aluminum alloy, the Fosi Audio K7 combines durability with a sleek, modern aesthetic. Its all-metal chassis, weighing 1.16 pounds (527g), features a black finish and rounded corners, offering a premium feel and enhanced electromagnetic interference shielding. The angled top plate and grippy rubber feet ensure stability and accessibility, while the robust construction protects against wear and supports heavy daily use. Triple intelligent protection circuits (overheat, overload, overcurrent) safeguard the device during extended gaming or listening sessions. Backed by a 24-month warranty and comprehensive customer support, the K7 is built to last, making it a reliable addition to any audio setup, from minimalist desktops to advanced HiFi systems.
Specifications
- Model: K7
- Chipset: AKM AK4493SEQ (DAC), XMOS XU208 (USB), Qualcomm QCC3031 (Bluetooth), TPA6120A2 (Amplifier), OPA1612 (Op-Amp)
- Inputs: USB-C, Optical, Coaxial, Bluetooth 5.0, 3.5mm Microphone
- Outputs: 3.5mm Single-Ended Headphone, 4.4mm Balanced Headphone, RCA Line Out
- Supported Formats (USB): PCM 32-bit/384kHz, DSD256
- Supported Formats (Optical/Coaxial): PCM 24-bit/192kHz
- Supported Formats (Bluetooth): PCM 24-bit/48kHz (SBC, AAC, aptX, aptX HD, aptX LL)
- Headphone Output Power (4.4mm Balanced): 2100mW + 2100mW @ 32Ω (THD+N <1%)
- Headphone Output Power (3.5mm Single-Ended): 600mW + 600mW @ 32Ω (THD+N <1%)
- Gain (4.4mm Balanced): High: +18.7dB, Low: +13.8dB
- Gain (3.5mm Single-Ended): High: +12.6dB, Low: +7.8dB
- Signal-to-Noise Ratio (SNR): ≥121dB (4.4mm), ≥122dB (3.5mm)
- Total Harmonic Distortion + Noise (THD+N): <0.0002%
- Dynamic Range: ≥121dB
- Noise Floor: ≤6.5μV (4.4mm), ≤2.5μV (3.5mm)
- Frequency Response: 20Hz-20kHz (±0.1dB)
- Recommended Headphone Impedance: 16-300Ω
- Bluetooth Version: 5.0
- Bluetooth Range: ≤13m (42.65ft)
- Power Supply: DC 12V/2A
- Dimensions: 6.1 x 3.54 x 1.97 inches (155 x 90 x 50mm)
- Weight: 1.16 lbs (527g)
- Material: Aluminum Alloy
- Color: Black
- Included Accessories: K7 DAC/Amp, 12V/2A Power Adapter, USB-C to USB-C Cable with USB-A Adapter, Bluetooth Antenna, 3.5mm Mic/Headphone Splitter