Fosi Audio Box X4vsTopping Pre90
A detailed side-by-side comparison of the Fosi Audio Box X4 and Topping Pre90 — two popular preamps in the Chinese HiFi space.
Specifications
Spec
Fosi Audio Box X4
Topping Pre90
Tubes
Jan5654W × 2
—
Topology
Phono Preamp (MM) + Tube Buffer
Solid State / NFCA Modules
Inputs
Phono (MM), Bluetooth 5.0
XLR (Balanced), RCA
Outputs
RCA, 3.5mm Headphone
XLR, RCA
Features
Bass/Treble Controls, Ground Post
Relay Volume Control, Remote Control, Optional Input Extender (Ext90)
S/N Ratio
—
124dB
Remote Control
✗
✓
Tube Stage
✓
✗
Phono Stage
✓
✗
Headphone Amp
✓
✗
Price (estimated)
Price
~$79
~$309
Difference
~$230.00 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.
Topping Pre90
- ⚠Input impedance is relatively low (10kΩ balanced), which may not pair well with some vintage tube sources.
- ⚠Remote control range is narrow and requires precise pointing.
- ⚠Sound can be perceived as 'lean' or 'dry' by those used to colored preamps.
* 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 P3Topping Pre90 vs Fosi Audio P3Fosi Audio Box X4 vs Musician MonocerosTopping Pre90 vs Musician MonocerosFosi Audio Box X4 vs Aiyima T8Topping Pre90 vs Aiyima T8Fosi Audio Box X4 vs Singxer SA-1 V2Topping Pre90 vs Singxer SA-1 V2Fosi Audio Box X4 vs Douk Audio P1Topping Pre90 vs Douk Audio P1Fosi Audio Box X4 vs Fosi Audio SK01Topping Pre90 vs Fosi Audio SK01