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Fosi Audio

Fosi Audio SK01 Portable Class A Amp — 3-Band Analog EQ

Fosi Audio SK01 Portable Class A Amp — 3-Band Analog EQ

  • Authorized Retailer
  • Free US Shipping $49+
  • 1-Year Warranty
  • 45-Day Returns
$79.99 USD
$79.99 USD
Sale Sold out
Shipping calculated at checkout.

The SK01 is a battery-powered Class A analog headphone amp with a real three-band EQ — bass, mid and treble knobs, plus a Pure button that bypasses tone shaping entirely when you want the signal untouched.

It delivers up to 2,400mW at 32 ohms on high gain and doubles as an analog preamp between any source and amp, running about six hours per charge. Note there is no DAC inside: feed it from a dongle, DAP line out or desktop DAC. The right tool if you want physical tone controls instead of software EQ, or need to rescue badly mastered recordings on the move.

  • Class A analog amp, up to 2,400mW at 32 ohms on high gain
  • Three-band analog EQ with Pure bypass
  • Works as an analog preamp
  • Around 6 hours per charge

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

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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.