Fosi Audio Box X2vsFosi Audio P3
A detailed side-by-side comparison of the Fosi Audio Box X2 and Fosi Audio P3 — two popular preamps in the Chinese HiFi space.
Specifications
Spec
Fosi Audio Box X2
Fosi Audio P3
Tubes
6J2 × 2 (Replaceable with 5654W)
5654W × 2 (Replaceable with 6J1, 6AK5, EF95)
Topology
Phono Preamp (MM) + Tube Buffer
Hybrid Tube Preamp
Inputs
Phono (MM) RCA
RCA, Bluetooth 5.1
Outputs
RCA
RCA, 3.5mm Headphone, 3.5mm Aux
Features
Adjustable Gain Settings (39/42/45 dB)
Bass/Treble Tone Controls, Reset Button for Tone Defeat
Remote Control
✗
✗
Tube Stage
✓
✓
Phono Stage
✓
✗
Headphone Amp
✗
✓
Price (estimated)
Price
~$69
~$79
Difference
~$10.00 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 P3
- ⚠Bluetooth input is always active/discoverable if not connected.
- ⚠Tube socket is tight; swapping tubes requires care to avoid bending pins.
- ⚠No remote control.
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