Fosi Audio Spider S C3 Gaming Sound Card

The Fosi Audio C3 is a gaming DAC and headphone amplifier with selectable USB, optical, and coaxial inputs, plus a 3.5mm microphone input. Hardware controls provide quick access to audio modes and sound adjustments for gaming and everyday listening.

Technical Specifications

• Chipset: XMOS XU316 + CS43131 + 2 × TPA6120
• Supported headphones: 16–300 Ω
• Inputs: Coaxial, optical, USB-C (power and data), 3.5mm microphone
• Outputs: 3.5mm headphone, RCA
• Input voltage: DC 5V
• Firmware updates: Online via USB-C
• USB audio: UAC 2.0: PCM up to 32-bit/384kHz and DSD256; UAC 1.0: PCM up to 16-bit/48kHz
• Optical / coaxial audio: PCM up to 24-bit/192kHz

3.5mm Headphone Output (UAC)

• Rated output: L+R ≥320mW + 320mW at 32 Ω (THD+N <1%)
• SNR / dynamic range: 123dB (A-weighted)
• THD+N: 0.0004% (A-weighted)
• Noise floor: ≤3μV (A-weighted)
• Frequency response: 20Hz–20kHz (±0.06dB)

RCA Output (UAC)

• Rated output: ≥2Vrms
• SNR / dynamic range: 124dB (A-weighted)
• THD+N: 0.0005% (A-weighted)
• Noise floor: ≤3μV (A-weighted)
• Frequency response: 20Hz–20kHz (±0.06dB)