SoundPath Lab · Verified product profile
Fosi Audio P4 Mini
Compact analogue preamplifier with three RCA inputs, remote volume control and bass/treble adjustment.
Verified data
Category-specific specifications
| Brand | Fosi Audio |
|---|---|
| Model | P4 Mini |
| Product category | Preamplifier |
| Inputs | 3 × RCA line |
| Outputs | RCA pre-out/line path |
| Tone controls | Bass and treble ±12 dB |
| Claimed SNR | ≥110 dB |
| Claimed THD+N | ≤0.003% |
| Remote | Included; motorized volume control |
Unknown fields are not treated as supported. Exact services, firmware behavior and regional availability can change after the checked date.
System fit
Best for / not ideal for
Best for
- Multiple analogue sources
- Remote volume control
- Simple power-amplifier systems
- Budget source switching
Not ideal for
- Digital inputs
- Phono without an external stage
- Balanced systems
SoundPath verdict
What matters beyond the spec sheet
Strengths
- Verified inputs data
- Strong functional value for the category
Weaknesses
- Digital inputs
- Phono without an external stage
Biggest limitation
It is analogue-only and provides no DAC, phono stage or streaming.
Best alternative
Fosi ZP3 for balanced I/O, high-pass filters and trigger control.
Best-value use case
Multiple analogue sources
Knowledge graph
Reviews, comparisons, guides and risks
Reviews & explainers
No dedicated review is published yet.
Comparisons
No dedicated comparison is published yet.
Guides
Use the System Builder for a complete signal path.
Problems & risks
No model-specific issue page is published; absence of a report is not proof of no issues.
Firmware
Latest known software status
- Latest known version
- See official support page / tracker
- Updated
- Not separately verified
- Last checked
- 2026-08-22
- Notes
- See the official support page and SoundPath firmware tracker before applying an update.
Purchase verification
Available channels
Official channel is listed first. A missing retailer link means the exact model/region was not verified, not that the retailer never carries it.
Member knowledge · editor reviewed
Questions, owner experience and product issues
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