1 5

Fosi Audio

Fosi Audio I5 Open-Back Planar Magnetic Headphones

Fosi Audio I5 Open-Back Planar Magnetic Headphones

  • Authorized Retailer
  • Free US Shipping $49+
  • 1-Year Warranty
  • 45-Day Returns
$483.99 USD
$483.99 USD
Sale Sold out
Shipping calculated at checkout.

The Fosi Audio I5 is an open-back planar magnetic headphone built around a 97mm diaphragm, aimed at professional HiFi monitoring work.

Large-diaphragm planars want a proper amp behind them, so plan on a desktop stack rather than a phone jack. Open-back means they leak both ways - excellent for a quiet room, tracking, or critical listening, not for an open office or a plane. If your current headphones are closed dynamics, expect a different kind of detail presentation and give them a full listening session before judging.

  • Open-back planar magnetic design
  • 97mm diaphragm
  • Intended for HiFi and professional monitoring

Authorized Fosi Audio retailer. Free US shipping over $49, 45-day returns, 1-year warranty.

View full details
Good to know

Frequently asked questions

Is this unit genuine?

Yes. TonePier is an authorized retailer — every unit comes from the brand or its official distributor, carries a valid serial number and is covered by the full manufacturer warranty.

How long does shipping take?

SKUs stocked in our US warehouse ship within 1–2 business days. Items shipped direct from our China hub typically arrive in 8–15 days with full tracking. The product page tells you which applies before you order.

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.