xDuoo XD-05 DAC / headphone amp upgrade with Burson Discrete V5i opamp

• Frequency response: amp 10 Hz – 100 kHz (±0.5 dB); USB/SPDIF 20 Hz – 20 kHz (±0.5 dB)
• Output power (headphone): 32 Ω 0.5 W
• Output impedance: not published
• Gain: +3 / +6 / +15 dB; bass boost 0 / +6 dB
• Inputs: USB (PCM 384 kHz/32-bit, DSD256); optical; coaxial; aux
• Outputs: 3.5 mm headphone
• DAC / chipset: AKM AK4490; XMOS XS1-U8A-64; Cirrus CS8422
• Other: S/N 112 dB; distortion 0.0025% (1 kHz); headphone range 8-300 Ω; OPA + dual BUF634 output

^[1]

• Supply voltage: ±5 V / 10 VDC to ±16 V / 32 VDC (absolute maximum)
• Gain-bandwidth product: 50 MHz (at 100 kHz)
• Dual or single: dual and single (this post uses the dual)
• Package: 11 mm wide × 11 mm deep × 7.3 mm high

^{[2] [3]}

Specs from manufacturer data unless a source below says otherwise. “calc.” values are worked out from those figures (V = √(P × R); 110 dB SPL used as a loud reference level). Gear listed without specs is not in our spec library yet.

1. xDuoo XD-05: archived page (web.archive.org)
2. Burson V5i Opamp datasheet V1.0
3. Burson V5i Opamp product page