The Fosi Audio P2 is a mini portable vacuum tube headphone amplifier that adds a tube stage between your source and headphones. It suits listeners after a tube's take on texture and midrange in a carry-friendly box, fed by a dongle DAC or line output, since it does not decode USB itself.
Who the Fosi Audio P2 is for
Listeners after tube character: Buy it for character rather than the spec sheet; tube stages are chosen for the way they shape texture and midrange.
Office listening: The miniature chassis puts an actual vacuum tube in a box you can take to work.
Owners of a dongle DAC or line-out source: It slots in between that source and your headphones, adding a tube stage to gear you already have.
Skip it if: you need a USB DAC; the P2 does not decode USB on its own and needs a dongle DAC or line output in front of it.
Fosi Audio P2 key specs
Type: Portable vacuum tube headphone amplifier
Source: Dongle DAC or line output (no USB decoding of its own)
vs SMSL D10: SMSL's dongle decodes USB on its own (dual CS43131), so it works as a standalone source; the P2 cannot decode USB and needs a DAC or line output in front of it.
vs FiiO KA13: A USB DAC and headphone amp in one dongle (dual CS43131); pick it if you need conversion and amplification together, the P2 if you already own a DAC and want a tube stage.
vs Fosi Audio DS2: Fosi's own mini USB DAC/amp dongle, rated up to 32-bit/768kHz, handles the decoding the P2 leaves out and can serve as the source feeding the P2.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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