Fosi Audio BT20A ProvsFosi Audio ZA3
A detailed side-by-side comparison of the Fosi Audio BT20A Pro and Fosi Audio ZA3 — two popular amplifiers in the Chinese HiFi space.
Specifications
Spec
Fosi Audio BT20A Pro
Fosi Audio ZA3
Class
D
D
Chipset
TI TPA3255
TI TPA3255
Power
2 × 300W @ 4Ω
155W x 2 (4Ω)
Inputs
RCA, Bluetooth 5.0
RCA, XLR
Features
Tone Controls with center detent (bypass), Pre-Out
Subwoofer Out, Trigger Input (dependent on revision), Op-Amp Rolling
Topology
—
Balanced Stereo / Mono
Remote Control
✗
✗
Tube Stage
✗
✗
Price (estimated)
Price
~$76
~$132
Difference
~$56.00 cheaper (Fosi Audio BT20A Pro)
Things to Know
Fosi Audio BT20A Pro
- ⚠Bluetooth is always active; anyone can pair with it if you don't disconnect.
- ⚠Tone controls can introduce slight phase shift even at center detent.
- ⚠Pre-out level is low compared to industry standards.
Fosi Audio ZA3
- ⚠Frequency response is load-dependent (high frequencies may rise with 8Ω loads due to lack of PFFB).
- ⚠The subwoofer output is full-range pass-through on the main terminals; it does not filter bass from the main speakers.
- ⚠Volume control is defeated in Mono mode, requiring a preamp.
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