Fosi Audio Box X4vsSingxer SA-1 V2
A detailed side-by-side comparison of the Fosi Audio Box X4 and Singxer SA-1 V2 — two popular preamps in the Chinese HiFi space.
Specifications
Spec
Fosi Audio Box X4
Singxer SA-1 V2
Tubes
Jan5654W × 2
—
Topology
Phono Preamp (MM) + Tube Buffer
Fully Balanced Discrete
Inputs
Phono (MM), Bluetooth 5.0
XLR, RCA
Outputs
RCA, 3.5mm Headphone
XLR Pre-out, RCA Pre-out, Balanced Headphone
Features
Bass/Treble Controls, Ground Post
Gain Switch (Low/High), Output Impedance Switch (Z)
Class
—
A
Remote Control
✗
✗
Tube Stage
✓
✗
Phono Stage
✓
✗
Headphone Amp
✓
✓
Price (estimated)
Price
~$79
~$599
Difference
~$520.00 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.
Singxer SA-1 V2
- ⚠No remote control (major downside for living room use).
- ⚠Gain switches are located on the bottom of the unit.
- ⚠Volume knob is analog; slight channel imbalance possible at very lowest levels (first 5%).
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