Aiyima T8vsFosi Audio Box X4
A detailed side-by-side comparison of the Aiyima T8 and Fosi Audio Box X4 — two popular preamps in the Chinese HiFi space.
Specifications
Spec
Aiyima T8
Fosi Audio Box X4
Tubes
6N3 (Replaceable)
Jan5654W × 2
Dac
ESS9018K2M
—
Inputs
Optical, USB, Coax, RCA, Bluetooth
Phono (MM), Bluetooth 5.0
Outputs
RCA (Pre-out), 6.35mm Headphone
RCA, 3.5mm Headphone
Features
Remote Control, OLED Display
Bass/Treble Controls, Ground Post
Topology
—
Phono Preamp (MM) + Tube Buffer
Remote Control
✓
✗
Tube Stage
✓
✓
Phono Stage
✗
✓
Headphone Amp
✓
✓
Price (estimated)
Price
~$80
~$79
Difference
~$1.00 cheaper (Fosi Audio Box X4)
Things to Know
Aiyima T8
- ⚠Headphone output output impedance is not specified but struggles with very low impedance IEMs.
- ⚠The tube is difficult to roll (change) due to the chassis design.
- ⚠RCA output level is slightly lower than standard 2V line level.
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.
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