• Fosi Audio Carbon12 IEMs with braided cable, silver titanium shells
  • Fosi Audio Carbon12 IEM features: 12mm driver, TC4 titanium cavity, silver-plated cable
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Fosi Audio

Fosi Audio Carbon12 IEMs — 12mm UTPT Carbon Driver, Titanium Shell, 2-Pin

Fosi Audio Carbon12 IEMs — 12mm UTPT Carbon Driver, Titanium Shell, 2-Pin
  • Genuine & Brand-New
  • Free Shipping · Ships from China
  • 1-Year Warranty
  • 45-Day Returns
$139.99 USD
$139.99 USD
Shipping calculated at checkout.

The Fosi Audio Carbon12 is a wired IEM with a single 12mm dynamic driver using Fosi Audio's UTPT thin-ply carbon diaphragm, a TC4 titanium shell with a carbon fiber faceplate, and a detachable 0.78mm 2-pin cable with a 3.5mm plug. It suits dongle and portable-player users who want an easy-to-drive (37Ω, 108dB/Vrms) IEM that Fosi Audio tunes for vocal-focused music.

Who the Fosi Audio Carbon12 is for

  • Vocal and pop listeners: Fosi Audio tunes the Carbon12 warm and full-bodied with slightly forward mids, aimed at pop and vocal-focused music.
  • Dongles and portable players: With 37Ω impedance and 108dB/Vrms sensitivity, Fosi Audio says it is easily driven by a dongle DAC or portable player.
  • Long listening sessions: Each earpiece weighs 7.5g, and the open front chamber is designed to relieve the plugged-up feel of sealed IEMs.
  • Fine-tuning the sound: Balanced, bass and treble ear tip sets plus low-, medium- and high-density nozzle foams (tweezers included) let you adjust bass and treble.
  • Balanced upgrades: The 0.78mm 2-pin connectors let you swap the included 3.5mm cable for a 4.4mm balanced cable, sold separately.
  • Skip it if: You want a multi-driver hybrid or a 4.4mm cable in the box; the Carbon12 has one dynamic driver per side and ships with a 3.5mm cable.

Fosi Audio Carbon12 key specs

  • Driver: 12mm dynamic, UTPT thin-ply carbon diaphragm
  • Housing: TC4 titanium alloy with forged carbon fiber faceplate
  • Impedance: 37Ω
  • Sensitivity: 108dB/Vrms @ 1kHz
  • Frequency response: 20Hz–40kHz
  • THD: ≤0.5% @ 1kHz
  • Weight: 7.5g per earpiece
  • Cable: Detachable 0.78mm 2-pin, four-strand silver-plated OFC, 3.5mm plug
  • In the box: Earphones, 3.5mm cable, balanced/bass/treble ear tips, nozzle tuning foams with tweezers, storage case

Genuine Fosi Audio stock. Free shipping on every order, 45-day returns.

Fosi Audio Carbon12 vs similar options

  • vs Fosi Audio IM4: Costs less and opens up the shell with an open-back design; pick the Carbon12 for a 12mm UTPT carbon diaphragm in a TC4 titanium housing.
  • vs FiiO FD15: Swaps in a magnalium DLC diaphragm and MMCX connectors; pick the Carbon12 if you prefer 0.78mm 2-pin cables and a TC4 titanium shell with a carbon fiber faceplate.

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Specifications

Driver 12mm dynamic driver, UTPT thin-ply carbon diaphragm
Impedance 37Ω
Sensitivity 108dB/Vrms @ 1kHz
Frequency response 20Hz–40kHz
Connector 0.78mm 2-pin (detachable); 3.5mm plug
Weight 7.5g per earpiece

What's in the box

  • Carbon12 earphones (pair)
  • 3.5mm cable with 0.78mm 2-pin connectors (four-strand silver-plated OFC)
  • Balanced, bass and treble ear tips in three sizes
  • Low-, medium- and high-density nozzle tuning foams
  • Tweezers
  • Storage case
Good to know

Buying from TonePier

Is this unit genuine?

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.