Fosi Audio M03 front panel for quick mode switching and clean controls.
Fosi Audio M03 rear panel with input/output connectors for speakers and subwoofers.
Fosi Audio M03 mode switch enabling PBTL or SUB configurations for flexible setup.
Fosi Audio M03 included 32V/5A power supply for reliable operation.
Fosi Audio M03 subwoofer connection area for easy passive or powered sub hookup.
Fosi Audio M03 in full-frequency mode driving bookshelf speakers with mono output.
Fosi Audio M03 built-in sub bass filter supporting 20-300 Hz bass control.
Fosi Audio M03 compact design fits small spaces without sacrificing power.

Fosi Audio

Fosi Audio M03 200W Subwoofer Amplifier — Mono PBTL & Sub Modes with 32V/5A Power

Free U.S. shipping and free 30-day returns. Check the compatible models in the description below.

$111.21

In stock. Ships free, usually within 1–4 business days.

Shop Pay installment options may appear at checkout where eligible.

Free shipping Secure checkout Free 30-day returns
Spare Keep a spare (2)

Check the listed compatible models and specs before you order. Questions? Email us.

Multi-device One for each device (3)

Free tracked shipping and secure checkout on every U.S. order.

Free shipping

i

Free tracked shipping on every order. Most orders arrive within 3–8 business days.

Free 30-day returns

i

Return eligible items within 30 days of delivery for a full refund. We email you a prepaid return label.

Peak-demand shipping delays

i

During high demand, deliveries may experience short carrier delays. Tracking updates remain active for every order.

Email support

Questions about fit or an order? Email nexoltic@gmail.com. We reply on business days (Mon–Fri).

Return & RefundFree 30-day returns, full refund Shipping PolicyDelivery process and tracking info
Share

Product details

Overview

The Fosi Audio M03 is a compact, versatile mono amplifier designed to handle both full‑range listening and dedicated subwoofer duty in a single enclosure. Its two‑mode design gives you flexible setup options for different rooms and speakers.

Two modes for versatile audio

In PBTL mode, the M03 can drive passive speakers and powered subs with mono accuracy. In SUB mode, it acts as a dedicated subwoofer amplifier for smooth low end. This approach keeps your signal chain simple while giving you room to grow your system over time.

  • Switch between PBTL and SUB to match your speakers and room acoustics
  • Drive bookshelf or floor‑standing speakers with clean, cohesive mono output
  • Provide dedicated bass power for sealed or ported subwoofers

Advanced technology and sound quality

The M03 packs the Texas Instruments TPA3255D2 chip with an integrated feedback design and PurePath Ultra‑HD gate drive error correction. The result is ultra‑low distortion across the audio band and a clearer, more natural sound at typical listening levels.

Design choices emphasize precision and efficiency, helping your system reproduce details from smooth mids to tight bass with minimal coloration.

Power and efficiency for home use

With the right supply, the M03 can deliver up to 200 watts of power. It can produce about 150 watts RMS into 4 ohms and 120 watts into 8 ohms. A 32V/5A power supply is included in the package; higher capacity may be needed to reach peak output in demanding setups.

  • High‑efficiency class D design supports sustained listening without overheating
  • Compact footprint suits desktops, AV stands, or small entertainment centers

Built for home hi‑fi with flexible bass control

The M03 includes a built‑in low‑pass filter for 20-300 Hz subwoofers with a SUB frequency control, making it easy to tailor the bass to your room and speakers without additional gear.

What you'll get is a simple, reliable amplifier ready to pair with a wide range of bookshelf and subwoofers for cohesive, enjoyable sound.

What you get

  • M03 amplifier
  • 32V/5A power adapter
  • User manual

Real‑world use cases

Perfect for compact home theaters, desktop music rigs, or small living rooms where space matters but audio fidelity remains important.

FAQ

Q: What is the Fosi Audio M03 best suited for?

A: Ideal for compact home theaters, desktop rigs, or small living rooms needing flexible mono and subwoofer power.

Q: Does the M03 require a powerful supply to reach maximum output?

A: Max power depends on the power supply; the package includes a 32V/5A adapter, with higher-capacity options for peak headroom.

You may also like