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Product description
Solid Power to Your Home Theater System Fosi Audio M04 Subwoofer Amplifier
SNR: ≥ 102dB; THD: ≤ 0.02% (1KHz, 1W)Max Power Output: 100watt @2Ω
Drive Your Bookshlef Speaker
Fill your device with the throbbing bass beats you want.
Drive Your Subwoofer Speaker
Play low frequencies without distortion, and provide enough clean power.
Sub Freq & Volume Control
Fine tunes the volume level signal you wish to control.
Fit Almost Anywhere
Improving the bass and the power of your music.
1 Mono Channel Amplifier
2 Subwoofer Amplifier
3 Tone Control
4 Powerful but Compact
1 Front Panel
2 Back Panel
3 Side Panel
4 Upper Panel
Texas Instruments TPA3116 Chip
Wide voltage input range and high efficiency.
Switching Between Modes
There is a switch for changing modes on the subwoofer amplifier M04. PBTL defines it as a Full-Frequency Mono amp for driving passive speakers. To SUB, it’s a subwoofer amplifier used with passive subwoofers.
DIY Your Audio System
Creating a professional sound system is easy with this mono amplifier. You can use this amp to drive most bookshelf speakers or subwoofers in your home.
Subwoofer/Mono Amp M04
Fosi Audio Subwoofer Amp
100W
MAX Power Output
220W
RCA
Input
Bluetooth + RCA
≤ 0.02%
THD
≤ 0.05%
≥ 102dB
SNR
≥ 102dB
19V/4.74A
Power Adapter
24V/4.5A
Bluetooth
100W
MAX Power Output
200W
RCA
Input
RCA
≤ 0.02%
THD
≤0.03%
≥ 102dB
SNR
≥106dB
19V/4.74A
Power Adapter
32V/5A
Bluetooth
100W
MAX Power Output
220W
RCA
Input
RCA
≤ 0.02%
THD
≤ 0.04%
≥ 102dB
SNR
≥ 98dB
19V/4.74A
Power Adapter
24V/4.5A
Bluetooth
Subwoofer/Mono Amp M01-BT 
Subwoofer/Mono Amp M03 
Subwoofer Amp TP-02 
High-Performance Mono Amplifier:The Fosi Audio M04 is a mono amplifier designed for driving passive subwoofers or speakers. It features the Texas Instruments TPA3116 chip and NE5532 op-amp, providing an output power of 100 watts for a 2-ohm subwoofer or speaker.
Enhanced Bass Response:The M04 SUB amp is designed to improve the bass response of passive subwoofers. It features a selector switch that allows the user to switch between subwoofer bass amplifier and full-frequency mono amplifier modes.
Compact and Robust Design:This mini amp has a small and robust design with a built-in low pass filter for subwoofers and a sub frequency control, making it practical and powerful. It uses highly efficient Class D technology that remains cool under demanding loads and doesn’t take up much space.
Superior Sound Quality:The home subwoofer amplifier can produce a deep, crisp, and clean low-frequency sound effect, making it an excellent addition to dedicated home audio receivers & amplifiers. It has been designed to enhance the sound and performance of your audio system at an affordable price.
Complete Package:What You Get: M04 subwoofer amp x1, 19V/4.74A power supply x1, user manual x1.
