The Fosi Audio SK01 is a battery-powered portable Class A headphone amp with a three-band analog EQ and Pure bypass, delivering up to 2,400mW at 32 ohms on high gain. With no DAC inside, it's for listeners who already own a dongle, DAP or desktop DAC and want physical tone controls.
Who the Fosi Audio SK01 is for
Hands-on EQ fans: Physical bass, mid and treble knobs stand in for software EQ.
Listeners stuck with badly mastered recordings: The analog EQ can rescue them on the move, and the Pure button bypasses tone shaping when you want the signal untouched.
Dongle and DAP owners: Fed from a dongle or a DAP's line out, it delivers up to 2,400mW at 32 ohms on high gain.
Systems that need an analog preamp: It also works as an analog preamp between any source and amp.
Skip it if: you need a DAC; there's none inside, so it has to be fed from a dongle, DAP line out or desktop DAC.
Fosi Audio SK01 key specs
Amplifier: Class A analog
Output power: Up to 2,400mW at 32 ohms (high gain)
EQ: Three-band analog (bass, mid, treble) with Pure bypass
DAC: None built in
Preamp mode: Analog preamp
Power: Battery-powered
Battery life: Around 6 hours per charge
Genuine Fosi Audio stock. Free shipping on every order, 45-day returns.
Fosi Audio SK01 vs similar options
vs Fosi Audio SK02: Builds in an ES9038Q2M DAC (USB-C) and 4.4mm balanced out, up to 755mW at 32 ohms; the SK01 needs an external DAC but brings three-band analog EQ and up to 2,400mW at 32 ohms.
vs Fosi Audio K5 PRO: Gaming DAC/amp for PS5, Switch or PC: USB-C, optical and coaxial inputs, mic passthrough, bass/treble knobs. The SK01 has no DAC, but its analog EQ adds a mid band to bass and treble.
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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