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Fosi Audio

Fosi Audio M03 Subwoofer Mono Amplifier

Fosi Audio M03 Subwoofer Mono Amplifier

  • Authorized Retailer
  • Free US Shipping $49+
  • 1-Year Warranty
  • 45-Day Returns
$96.99 USD
$96.99 USD
Sale Sold out
Shipping calculated at checkout.
Title

The Fosi Audio M03 is a 300W digital mono subwoofer amplifier for home HiFi and home theater systems. This listing is the version bundled with the 32V/5A power supply.

It exists to solve one problem cleanly: you have a passive subwoofer and need amplification for it without buying a whole new receiver. Run it alongside your existing stereo amp or AV setup and let it handle low-end duty on its own. Note the power supply version when comparing listings - the bundled brick is part of what you're buying.

  • 300W digital mono amplifier
  • Purpose-built for subwoofer duty
  • Includes 32V/5A power supply

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

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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.