Aiyima T9 ProvsFosi Audio V3 Mono
A detailed side-by-side comparison of the Aiyima T9 Pro and Fosi Audio V3 Mono — two popular amplifiers in the Chinese HiFi space.
Specifications
Spec
Aiyima T9 Pro
Fosi Audio V3 Mono
Class
D (Hybrid)
D
Chipset
TPA3250 + Jan5725 Tubes
TI TPA3255 (with PFFB)
Power
2 × 100W @ 4Ω
240W @ 4Ω (48V/5A supply)
Inputs
Optical, Coax, USB, RCA, Bluetooth
RCA, XLR / ¼” TRS
Features
VU Meter (Active), Tone Controls, Remote
Auto-Standby, 12V Trigger, Gain Switch (25dB/31dB)
Topology
—
Monoblock
THD / SINAD
—
-120 dB (SINAD via XLR)
Remote Control
✓
✗
Tube Stage
✓
✗
Price (estimated)
Price
~$118
~$131
Difference
~$13.00 cheaper (Aiyima T9 Pro)
Things to Know
Aiyima T9 Pro
- ⚠VU meter sensitivity is not adjustable; barely moves at low volumes.
- ⚠The tube stage adds measurable distortion (2nd harmonic), which is intentional for 'flavor' but not high-fidelity.
- ⚠Runs quite warm due to the tubes and internal DAC.
Fosi Audio V3 Mono
- ⚠Chassis gets significantly warm due to the compact thermal design coupled with high power density.
- ⚠Auto-standby feature produces a mechanical 'click' that some users find audible in quiet rooms.
- ⚠Requires two separate power bricks (or a specialized splitter) for a stereo pair, adding cable clutter.
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