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Mini Subwoofer Amplifier Full-Frequency Mono Stereo Amp
Mini size and solid shell
Subwoofer Amplifier for Home Theater
Power Adapter: 19V/4.74A DC Input Range: 12V-24V
Terminating Impedance: 2 Ohm - 8 Ohm Bass Frequency Range: 20-200Hz
MAX Power Output: 100Watt @4Ohm
Full Frequency Response Range: 20Hz-20KHz(± 3db)
Input Sensitivity: ≤ 0.2mV SNR ≥ 106dB THD ≤0.03%
Mode Switching
Switch to PBTL, it's a Full-Frequency Mono amp for driving passive speakers. Switch to SUB, it's a subwoofer amplifier for diving passive subwoofers.
DIY Your Audio System
This amplifier gives you the power and versatility you need to create a professional sound system. Great amp to drift most home bookshelf speakers or subwoofers.
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 |
Bluetooth | |
100W | MAX Power Output | 200W |
RCA | Input | RCA |
≤ 0.02% | THD | ≤0.03% |
≥ 102dB | SNR | ≥106dB |
Bluetooth |
100W | MAX Power Output | 220W |
RCA | Input | RCA |
≤ 0.02% | THD | ≤ 0.04% |
≥ 102dB | SNR | ≥ 98dB |
Bluetooth |
100W | MAX Power Output | 165W×2+350W |
RCA | Input | Bluetooth + RCA |
≤ 0.02% | THD | ≤ 0.03% |
≥ 102dB | SNR | ≥ 105dB |
Bluetooth | |
- Subwoofer/Mono Amp M01-BT
- Subwoofer/Mono Amp M03
- Subwoofer/Mono Amp TP-02
- 2.1 CH Amp BT30D PRO
Customer
Reviewed in Australia on March 9, 2025
Arrived fast works well
T W
Reviewed in Canada on March 27, 2025
Great little amp. I use with a small KSL sub that the plate amp died.Have been using it daily for several months in my shop.sounds great no issues.
Alex Maltais
Reviewed in Canada on January 3, 2025
My subwoofer Factory plate amp gave up, this one does a good job to replace it, and good value for money !
パパ
Reviewed in Japan on January 18, 2025
低音調整が簡単に、自分の好きな音に合わせれます。
Gerardo Segura Lira
Reviewed in Mexico on March 23, 2024
Muy bien con una buena instalación, hizo lo que esperaba, así es que estoy satisfecho 👌
Will B.
Reviewed in Canada on March 14, 2024
I’m using this to power some Dayton bass pucks, and it’s perfect. A good amount of power, and the low frequency cut-off is totally effective (the pucks otherwise echo vocals, etc… and sounds bad and distracting). They’d also be capable of just powering a pair of bookshelf speakers, there’s a switch to disable the LF cutoff and go full frequency.
ASGM
Reviewed in the United States on February 16, 2024
Got this subwoofer amp to bypass the amp component of my active subwoofer which died months ago due to a peak in voltage. My amp was those that work in "stand-by" mode, so they are always powered up somehow. Replacing the board with a new one (original) was too expensive, even more expensive than what the sub costed me in the first place, so in order to not throw the box and the woofer cone to the trash, I decided to just rewire things up in order to bypass the sub's integrated amp, so I got this GREAT little FOSI amp to power my "now passive" sub.Things worked great and my sub is now back to life, shining again.The M04 Fosi Amp is a great choice as it is POWERFUL, noiseless (at least to my ear), very small and does not generate any important heat. It comes with a power adapter, so you only need the cables to connect the input signal and the output signal to the passive subwoofer. I used the convenient "bare wire connection" to hook the modified sub to the speaker output of the Fosi Amp. Worked NICELY.Quality of the M04 Fosi AMP is VERY GOOD, in a very neat, compact and ellegant BLACK enclosure. It is definitely worth the money, which is NOT AT ALL expensive, but quality exceeds by far the amount paid for this amp.Until now, i'm really loving it.
Trevor Taylor
Reviewed in Canada on December 11, 2024
I installed a surround sound (7.2) system when I renovated my family room. I need 1 each for my in-wall subs and then got 2 more to power 4 “shakers” that I installed on my couch. They’re awesome little amps. Clear sound, plenty of “oomph,” and don’t get too hot. They are perfect for my subs and shakers. I recommend.
Stephen Young
Reviewed in Canada on November 5, 2024
It works well with a passive sub-woofer and with the cut-off frequency adjusted right it compliments the sound of the rest of the system (high-end speakers which just lack deep bass).
p2
Reviewed in Japan on December 27, 2023
2.1chの中華アンプでパッシブサブウーファー鳴らしてましたが、やっぱり2ch+1chSW構成（SW端子ではなくパラで繋いでます）のほうが全然調整しやすいですね。SWだけ鳴らして低音具合確認できないとまともに調整できないです。また、2.1chのSW出力だと出力足りなかったということもよくわかりました。もっと早くこうしてればよかった・・・こんなにいい低音で鳴らせたんだ・・と時間を無駄にしたことを後悔。
Michael Lobo
Reviewed in Canada on December 22, 2023
It’s an excellent subwoofer driver in the market
Kmanator
Reviewed in Canada on October 31, 2023
I first hooked this little sub amp up to a 4 Ohm 10" single voice-coil car sub in a 0.85 cu ft. sealed enclosure. If I turned the M04's gain to near maximum and pushed the Fosi T3 tube-amp powering the main speakers (Klipsch SB-2's with 94 dB@1W efficiency) above 50%, you would get a decent filling out of the lowest octave, but no bass extravaganza. Next up was a 10" Orion with dual 4 Ohm voice coils wired in parallel in a ported box of about 2.2 cu. ft. Power was upgraded to a 24V, 5A AC/DC adapter. Then I only needed 2/3 gain on the M04 and about 40% volume on the Fosi to start vibrating the walls. It's a bit of overkill (the amplitude and the enclosure) for a small room. Next trial will be twin Kicker 6.5 F1s wired in parallel, with dual 10" passive radiators in a 1 cu ft. box. I think that should be the goldilocks combo. The max power rating in the published specs was obtained at 3 Ohms with a 6 Amp 24V power supply, but you won't get close to that with the stock PSU. If you have the means and especially if want to drive a big 8 Ohm sub of average sensitivity, I suggest going with the Fosi TP02 and a 32 or 36V PSU of at least 5 amps. The amp's gain and high freq. cut-off knobs are quiet and good quality. At $56 Cdn it is a solid 5 stars with a compatible low impedance or high sensitivity sub. At regular price that drops to 4+ stars, and is probably not really suitable for most 8 Ohm home subs of anything less than about 90dB@1 W sensitivity.
Til
Reviewed in Canada on October 11, 2023
This is my second Fosi product to tune existing stereo systems. The last purchase was a preamp. This purchase is was an amp, but I am using it for a powered sub. I used RCA adapters and lowered the volume on both this and the sub to about half. This Fosi tuned my sub so I got a bit more pounding on my hardware floor. I also have very rude neighbours so I am glad I can drown them out with my setup when they are loud. Fosi, just makes it better.
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