Fosi Audio P4 Mini Stereo Preamp
- Number Of Channels: 2
- Warranty Description: 2 years
- Item Weight: 1.05 pounds
- Unit Count: 1
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A compact-footprint amplifier from Fosi Audio for tight desktop or shelf spaces, worth confirming wattage and input type directly before buying.
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ASIN: B0DR2GKYW3Model: P4Category: Audio Amplifiers
Overview
The Fosi Audio P4 is a compact amplifier measuring 5.5 by 4 by 1.2 inches, built for a desktop or small shelf setup rather than a full-size stereo cabinet, with wattage and input specs left undocumented in this listing.
Fosi Audio built its catalog around small amplifiers aimed at desktop and near-field listening, and the P4's footprint fits that pattern. Beyond the physical dimensions, the listing does not specify wattage, input type or speaker terminal style, so anyone comparing it to a specific receiver or speaker pair should confirm those details on the product page first.
- Desktop-scale amplifier
- 5.5 x 4 x 1.2 in dimensions
- Fosi Audio brand
- Compact footprint design
Who it's for
Suited to a desk or small shelf where a full-size receiver would not fit. Not the choice for anyone needing documented power output or multi-channel support, since neither is listed here.
Pros and cons
- Compact 5.5 x 4 x 1.2 inch footprint
- Fits desktop or small shelf setups
- No listed wattage or power output
- No input or terminal details given
Performance notes
At 5.5 by 4 by 1.2 inches, the P4 is sized to sit on a desk next to a monitor or on a shelf beside a pair of small speakers rather than in a full stereo cabinet. The listing does not include power output figures, so how it drives larger speakers is not something the spec sheet answers.
Specifications
| Brand | Fosi Audio |
|---|---|
| Model | P4 |
| Dimensions & fit | |
| Item Weight | 1.05 poundslower than 78% of 38 audio amplifiers |
| Item Dimensions | 5.5 × 4 × 1.2 inches |
| Included components | |
| Unit Count | 1 |
| Included Components | Fosi Audio P4 Preamplifier x1, User Manual x1, Remote Control x1, 12V/1.5A Power Supply x1 |
| Warranty & support | |
| Warranty Description | 2 years |
| Other details | |
| Number Of Channels | 2 |
| Part Number | P4 |
Closest rivals on specs
Pyle PFA300 Home HiFi Stereo Amplifier 90W- Item Weight 1.05 vs 1.2 pounds (-12%)
LiNKFOR MA400 XLR Headphone Amplifier- Item Weight 1.05 vs 0.84 pounds (+25%)
Frequently asked questions
What size is the Fosi Audio P4 amplifier?
It measures 5.5 by 4 by 1.2 inches.
Is the Fosi Audio P4 meant for desktop use?
Its compact dimensions suit a desktop or small shelf rather than a full-size stereo cabinet.