Fosi Audio Box X2vsFosi Audio SK01
A detailed side-by-side comparison of the Fosi Audio Box X2 and Fosi Audio SK01 — two popular preamps in the Chinese HiFi space.
Specifications
Spec
Fosi Audio Box X2
Fosi Audio SK01
Tubes
6J2 × 2 (Replaceable with 5654W)
—
Topology
Phono Preamp (MM) + Tube Buffer
Solid State Op-Amp
Inputs
Phono (MM) RCA
3.5mm Line In
Outputs
RCA
3.5mm Line Out, 3.5mm/6.35mm Headphone
Features
Adjustable Gain Settings (39/42/45 dB)
Hardware Loudness Switch, 3-Band EQ, High/Low Gain
Remote Control
✗
✗
Tube Stage
✓
✗
Phono Stage
✓
✗
Headphone Amp
✗
✓
Price (estimated)
Price
~$69
~$70
Difference
~$1.00 cheaper (Fosi Audio Box X2)
Things to Know
Fosi Audio Box X2
- ⚠No power switch on the front (toggle switch is on the cable or back depending on revision).
- ⚠Stock tubes (6J2) are often microphonic; upgrading to GE 5654W or Riverstone tubes is almost mandatory.
- ⚠Can introduce hum if placed too close to power amplifiers or WiFi routers.
Fosi Audio SK01
- ⚠Built-in battery is unnecessary for a desktop unit and will eventually degrade/fail.
- ⚠Input is limited to a single 3.5mm jack (no RCA inputs without adapter).
- ⚠Form factor is tall and narrow, making it easy to tip over when heavy cables are attached.
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