Fosi Audio Box X2vsTopping Pre90
A detailed side-by-side comparison of the Fosi Audio Box X2 and Topping Pre90 — two popular preamps in the Chinese HiFi space.
Specifications
Spec
Fosi Audio Box X2
Topping Pre90
Tubes
6J2 × 2 (Replaceable with 5654W)
—
Topology
Phono Preamp (MM) + Tube Buffer
Solid State / NFCA Modules
Inputs
Phono (MM) RCA
XLR (Balanced), RCA
Outputs
RCA
XLR, RCA
Features
Adjustable Gain Settings (39/42/45 dB)
Relay Volume Control, Remote Control, Optional Input Extender (Ext90)
S/N Ratio
—
124dB
Remote Control
✗
✓
Tube Stage
✓
✗
Phono Stage
✓
✗
Headphone Amp
✗
✗
Price (estimated)
Price
~$69
~$309
Difference
~$240.00 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.
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.
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