Douk Audio T3 PLUSvsFosi Audio Box X4
A detailed side-by-side comparison of the Douk Audio T3 PLUS and Fosi Audio Box X4 — two popular preamps in the Chinese HiFi space.
Specifications
Spec
Douk Audio T3 PLUS
Fosi Audio Box X4
Tubes
6A2 × 2
Jan5654W × 2
Topology
Phono Preamp (MM)
Phono Preamp (MM) + Tube Buffer
Inputs
Phono (MM) RCA
Phono (MM), Bluetooth 5.0
Outputs
RCA
RCA, 3.5mm Headphone
Features
Ground Post, Metal Chassis
Bass/Treble Controls, Ground Post
Remote Control
✗
✗
Tube Stage
✓
✓
Phono Stage
✓
✓
Headphone Amp
✓
✓
Price (estimated)
Price
~$75
~$79
Difference
~$4.00 cheaper (Douk Audio T3 PLUS)
Things to Know
Douk Audio T3 PLUS
- ⚠The 6A2 tubes are less common than the 5654W/6J1 family, making tube rolling slightly more difficult.
- ⚠No volume control; it is a fixed-gain phono stage.
- ⚠Included power supply is a basic switching wall wart that can introduce noise.
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.
* As an affiliate, we may earn a small commission from qualifying purchases — at no extra cost to you.
Related Comparisons
Douk Audio T3 PLUS vs Fosi Audio P3Fosi Audio Box X4 vs Fosi Audio P3Douk Audio T3 PLUS vs Topping Pre90Fosi Audio Box X4 vs Topping Pre90Douk Audio T3 PLUS vs Musician MonocerosFosi Audio Box X4 vs Musician MonocerosDouk Audio T3 PLUS vs Aiyima T8Fosi Audio Box X4 vs Aiyima T8Douk Audio T3 PLUS vs Singxer SA-1 V2Fosi Audio Box X4 vs Singxer SA-1 V2Douk Audio T3 PLUS vs Douk Audio P1Fosi Audio Box X4 vs Douk Audio P1