Fosi Audio Box X4vsMusician Monoceros
A detailed side-by-side comparison of the Fosi Audio Box X4 and Musician Monoceros — two popular preamps in the Chinese HiFi space.
Specifications
Spec
Fosi Audio Box X4
Musician Monoceros
Tubes
Jan5654W × 2
—
Topology
Phono Preamp (MM) + Tube Buffer
Class A Discrete
Inputs
Phono (MM), Bluetooth 5.0
2 × XLR, 1 × RCA
Outputs
RCA, 3.5mm Headphone
XLR, RCA
Features
Bass/Treble Controls, Ground Post
—
Volume
—
R-2R Resistor Ladder (60 steps)
Weight
—
7 kg
Remote Control
✗
✓
Tube Stage
✓
✗
Phono Stage
✓
✗
Headphone Amp
✓
✗
Price (estimated)
Price
~$79
~$1169
Difference
~$1090.00 cheaper (Fosi Audio Box X4)
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.
Musician Monoceros
- ⚠Volume relays make a clicking sound when adjusting level (normal for R2R but can be surprising).
- ⚠Runs warm due to Class A operation.
- ⚠Display is retro LED style which some find outdated compared to OLED.
Currently Unavailable
* As an affiliate, we may earn a small commission from qualifying purchases — at no extra cost to you.
Related Comparisons
Fosi Audio Box X4 vs Fosi Audio P3Musician Monoceros vs Fosi Audio P3Fosi Audio Box X4 vs Topping Pre90Musician Monoceros vs Topping Pre90Fosi Audio Box X4 vs Aiyima T8Musician Monoceros vs Aiyima T8Fosi Audio Box X4 vs Singxer SA-1 V2Musician Monoceros vs Singxer SA-1 V2Fosi Audio Box X4 vs Douk Audio P1Musician Monoceros vs Douk Audio P1Fosi Audio Box X4 vs Fosi Audio SK01Musician Monoceros vs Fosi Audio SK01