Fosi Audio Box X4vsTopping L70
A detailed side-by-side comparison of the Fosi Audio Box X4 and Topping L70 — two popular preamps in the Chinese HiFi space.
Specifications
Spec
Fosi Audio Box X4
Topping L70
Tubes
Jan5654W × 2
—
Topology
Phono Preamp (MM) + Tube Buffer
NFCA (Nested Feedback Composite Amplifier)
Inputs
Phono (MM), Bluetooth 5.0
XLR (Balanced), RCA
Outputs
RCA, 3.5mm Headphone
XLR Pre-out, RCA Pre-out, 4.4mm/XLR/6.35mm Headphone
Features
Bass/Treble Controls, Ground Post
Relay Volume Control, Remote Control, Ground Loop Switch
Remote Control
✗
✓
Tube Stage
✓
✗
Phono Stage
✓
✗
Headphone Amp
✓
✓
Price (estimated)
Price
~$79
~$279
Difference
~$200.00 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 L70
- ⚠Rear panel is extremely crowded; thick XLR cables can be difficult to unplug.
- ⚠The 'clicking' sound of the volume relays is audible inside the chassis when changing volume (normal but surprising to new users).
- ⚠Display menu system is somewhat cryptic (abbreviations like 'H-G' for High Gain).
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