Fosi Audio Box X4vsFosi Audio P3
A detailed side-by-side comparison of the Fosi Audio Box X4 and Fosi Audio P3 — two popular preamps in the Chinese HiFi space.
Specifications
Spec
Fosi Audio Box X4
Fosi Audio P3
Tubes
Jan5654W × 2
5654W × 2 (Replaceable with 6J1, 6AK5, EF95)
Topology
Phono Preamp (MM) + Tube Buffer
Hybrid Tube Preamp
Inputs
Phono (MM), Bluetooth 5.0
RCA, Bluetooth 5.1
Outputs
RCA, 3.5mm Headphone
RCA, 3.5mm Headphone, 3.5mm Aux
Features
Bass/Treble Controls, Ground Post
Bass/Treble Tone Controls, Reset Button for Tone Defeat
Remote Control
✗
✗
Tube Stage
✓
✓
Phono Stage
✓
✗
Headphone Amp
✓
✓
Price (estimated)
Price
~$79
~$79
Things to Know
Fosi Audio Box X4
- ⚠Headphone output is relatively weak and can sound thin with high-impedance headphones.
- ⚠Tube sockets are extremely tight; changing tubes requires significant force and care.
- ⚠Bluetooth input is 'always on' and can be hijacked by neighbors if not paired.
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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