Fosi Audio M03 200 Watt TPA3255 Subwoofer Amplifier Mini Mono Channel Audio Power Amp for Home Theater Full-Frequency and SUB Bass Switchable with 32V/5A Power Supply
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Availability:
In Stock.
Arrives
Sunday, Nov 1
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At a glance
- Condition
- New
- Model
- M03
- Dimensions
- 5.12 x 4.13 x 1.37 in
- Voltage
- 220 volts
- Maximum Supply Voltage
- 32 V DC
- Minimum Supply Voltage
- 24 V DC
- Mounting Type
- Surface Mount
- Warranty
- 18-month manufacturer
Features 5
- Subwoofer Amplifier and Full-Frequency Mono Amp: The audio amplifier offers versatile functionality with two modes. Switch to PBTL mode to use it as a full-frequency mono amplifier for driving passive speakers and powered subwoofers. Switch to SUB mode to use it as a dedicated subwoofer amplifier for driving passive and powered subwoofers.
- Advanced Audio Technology: The audio receiver utilizes the Texas Instruments TPA3255D2 chip, featuring an advanced integrated feedback design and proprietary high-speed gate driver error correction (PurePath Ultra-HD). This technology ensures ultra-low distortion across the audio band, delivering superior audio quality.
- High-Efficiency Power Output: The power amplifier provides high-efficiency power output up to 200 watts. It can deliver 150 watts RMS into 4-ohm loads or 120 watts into 8-ohm loads. (Note: The package includes a 32V/5A power supply, but a more powerful power supply is needed to achieve the maximum power output.)
- Home Hi-Fi Amplifier with Clean Sound Quality: The home stereo receiver is designed for home Hi-Fi systems, offering clean sound quality. It features a built-in low pass filter for 20-300Hz subwoofers with SUB frequency control, making it an excellent amplifier for driving any bookshelf speaker or subwoofer.
- What You Get:M03 amp x1, 32V/5A power adapter x1, and user manual x1.
Description
200 Watt Subwoofer Amp Home Theater Fosi Audio was founded with a simple goal: Build products that sound great and make people want to listen to music every day. We design, manufacture, and sell many Hi-Fi audio products on the market. We pursue your perfect music journey. Enjoy Hi-Fi music with Fosi Audio audio products NOW! Switch to PBTL, it's a Full-Frequency Mono amp for driving passive speakers and a powered subwoofer. Switch to SUB, it's a subwoofer amplifier for diving passive and powered subwoofers. Adopt Texas Instruments TPA3255D2 Chip, MAX power output up to 200Watt, providing 150 watts RMS into 4-ohm loads or 120 watts to 8-ohm loads. Strong internals makes for A lively listen. With a built-in power protection circuit, there are no sparks flying when you plug the power adapter into the amplifier. Safe for use! This amplifier gives you the power and versatility you need to create a professional sound system. Great amp to drive most home bookshelf speakers or subwoofers. Curved edges and sleek controls accentuate its unibody design. With truly useful features, and thoughtfully designed premium enclosures. Fosi Audio M03 amp comes with an energy-efficient and stable power supply which got authoritative certification by many security tests can get an astonishing sound. Guided by our mission of "Redefining HiFi with Unmatched Value", Fosi Audio continues to fuel its passion for the Hifi industry, ramp up R&D efforts, and co-create new HiFi equipment with users. We pledge to bring more amazing Hifi gear with high value for the price, innovative design, cutting-edge technology, and premium quality, to audiophiles worldwide.
Specs 16
| Item dimensions L x W x H | 5.12 x 4.13 x 1.37 inches |
|---|---|
| Voltage | 220 volts |
| Manufacturer | Fosi Audio |
| Maximum Supply Voltage | 32 V DC |
| Minimum Supply Voltage | 24 V DC |
| Mounting Type | Surface Mount |
| Number of Channels | 1 |
| Package Type Name | Box" or "Case |
| Maximum Output Power | 200 watts |
| Item Dimensions | 5.12 x 4.13 x 1.37 inches |
| Model | M03 |
| Brand Name | Fosi Audio |
| Number of Items | 1 |
| Unit Count | 1 Count |
| Number of Packs | 1 |
| Part Number | Ｍ03 |
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Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Nov 1
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
A powerful driver for a sub woofer
UPDATE: The TAPE out hookup I mentioned below worked great for levels, but TAPE out is, by design, not controlled by the volume knob on my Pioneer receiver, so I had to constantly adjust two knobs, one under my desk at the sub, so not ideal. The solution? I just added a $25 preamp before the FOSI to have excellent subwoofer levels from the Pioneer subwoofer output, plenty of signal now at half volume or less on both the preamp and the FOSI main amp. The preamp is also a simple and excellent little device. https://www.amazon.com/dp/B0945RFJ6Z?ref=ppx_yo2ov_dt_b_fed_asin_title I went with this preamp instead of some units, like the FOSI preamp, because it does NOT do any RIAA equalization that I did not want to add to the mix. I bought this FOSI to get my 24 year old KLH subwoofer running again. I am very pleased. I was able to remove the plate amp assembly and leave the SW box sealed on the back as it has always been, by the plastic box that had housed the circuitry. I might mount the FOSI in this plastic recess, but for now it sits atop the SW cabinet and if its rubber feet keep it from walking off I will just leave it there for ease of reaching the controls. This tiny powerhouse is driving the 8" KLH speaker to make better sounds and deep vibrations, than it has for years. Gone are the occasional deep pop and rattle sounds that I had thought might mean the speaker cone itself had deteriorated. It turns out the old cone is just fine. The KLH built in amp had apparently been slowly cooking its circuit board for a long time before it gave up completely last week. It looks like a bulging cap and some burned resistors... maybe I will fix that board someday. One word of warning. I was driving the old KLH ASW 100 powered subwoofer with an RCA Y-cable from the low level sub output RCA jack of a 20 year old Pioneer home theater amp. It turns out that the signal level on that jack is too low to get more than just a faint response from this FOSI, even turned up to the max. So don't assume this will be a direct replacement if you have that kind of subwoofer hookup. I ended up driving this FOSI with a dual RCA cable from the tape record outputs of the Pioneer, and I am getting loud, clear and rumbling bass from the FOSI at only about four clicks of the volume knob. The FOSI volume and freq cutoff controls have a nice, subtle, detent feel.
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Reviewed in the United States on December 18, 2024 by Gains
Powering my Dayton Audio IOSUB 10-inch outdoor subwoofer
This Fosi Audio M03 has been doing a great job powering my Dayton Audio IOSUB 10-inch outdoor subwoofer (150W RMS, 4 ohms). I'm using it as part of an outdoor sound system with a Pyle PTA66BT six-channel receiver. The Pyle sends audio through its RCA subwoofer output to the Fosi M03, which then powers the Dayton subwoofer through regular speaker wire. I keep the Fosi amplifier sheltered from the weather in my carport while the weather-resistant Dayton handles the bass outside. The M03 provides plenty of power for my needs, and the bass sounds excellent! I especially like having independent volume and crossover frequency controls so I can dial in the bass to complement my other outdoor speakers. It's a compact, affordable solution that has worked out really well for this setup. I'm very pleased with its performance so far and will update this review if anything changes!
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Reviewed in the United States on October 14, 2026 by RJ
This is the solution to any passive subwoofer!
I have a lot of experience with these Fosi Audio amplifiers. They never cease to amaze me. As you can see in the video, I have a subwoofer hooked up to this mono amp. I converted the subwoofer to passive because the internal amp fried. Those replacement amps are expensive while the Fosi amps Are perfect for this situation and sound amazing and caused less. Plus they're tiny, easy to hook up. Have clean sound with no distortion. They weigh basically nothing and you can put them just about anywhere. If you're an audio person or you mess with home theater or anything like that or you just want to test subwoofers this is the perfect amp for it. I keep one on my test bench as well.
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Reviewed in the United States on March 18, 2026 by The Stash Toys and Collectibles
Solid sub amp for price point, but not 300W RMS.
UPDATE: After using this amp for a few months, while I still think it's a good value for what it is at this price point, I'll say that the 300W rating is misleading. Normally amps are rated for their per-channel RMS capabilities, whereas in this case 300W is the peak power possible only using a 4 ohm load (half that if you're using 8 ohms). That means 140-150W RMS at 4 ohms, which certainly produces usable bass if used with a sub, but I've had the amp shut off once or twice due to clipping when driving it hard. Admittedly for that level of bass I should be using a stronger amp, but this is worth sharing. I had a couple old car subwoofers in my closet that I hadn't used in years, and when I got my hands on a box again I went looking for a way to power one of them in my living room to complement my Klipsch RB6 bookshelf speakers. I've used this Fosi Audio amp with both an Infinity Kappa 12" and Kicker CVR 12" (swapping between) and both sound solid. The bass extension goes low enough to rattle things on my walls even with this amp's volume at probably 65% in a medium-sized living room, and it's great to have the adjustable crossover. Some folks seemed to doubt whether this amp's claims of 300W were legit and I've not used a multimeter to check or anything, but I'll say that it seems to have no trouble driving my sub to nice home theater listening levels, and it's nice that it's small and doesn't take up a lot of space alongside the receiver. I've driven the sub hard enough that it's almost uncomfortable to be in the room with it for a good hour or two straight and the amp never got more than slightly warm. That's a good sign of efficient power. Build quality seems pretty good, and I like the click feature of the volume knob -- makes it easy to turn it up or down a couple clicks and have a tactile feel for precision. One area for improvement would be if the lines on the crossover knob were labelled so you knew what specific frequency you were cutting off at. As it is you're kind of guessing, but after a little back and forth of setting, sitting on the couch and listening, then getting up to adjust, I have it dialed in pretty well. Nothing about the amp feels cheap or rattles when you handle it, and I like that there are banana plug/twist style speaker connections on the back rather than cheap spring clips. It sounds good enough that my wife said, "Maybe we should get a second one and power the other sub." Any time there's wife buy-in on audio gear in the living room, it's a plus. :-) Would definitely recommend this to anyone who already has a sub and box looking for an affordable way to power it.
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Reviewed in the United States on December 19, 2019 by Brian Watkins
Very nice, compact amp
This is a very nice, compact amp that delivers the perfect punch for a Sonos sub that I converted to a passive speaker after its power & amplifier board failed. The switches and knobs have good feel. The unit feels well built. After driving my sub at nearly full power for a couple hours the case was only slightly warm, so it does a good job of keeping itself cool and should have a good lifespan.
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Reviewed in the United States on September 8, 2026 by Robert McRae
Works well so far
I'm using this to power a 15" subwoofer that the integrated amp quick working, the sound is good and it's loud enough. Hopefully it will last for years.
Reviewed in the United States on October 7, 2026 by Chris L
Sketchy, low build quality, and sketchy. Stay away.
To start off, when I bought this amp it was advertised as 300 watts, not 200. I only found out I’d been scammed when I tried to pull up the product page when the thing broke. This product is SUPER unsafe. The electronics inside the high voltage power adapter are loose and exposed, and the casing is coming apart. Thank god I noticed the broken power brick and unplugged it or who knows what would have happened. I tried to find a replacement adapter but they’re only sold in China and I couldn’t find a source I trusted. Fosi Audio’s “customer service” did not respond to me. Overall, these things are SKETCHY. Who knows what wattage they actually are because the claims jump around, but it’s probably too high to be playing games with. It’s scary that no one knows what these things actually are, what wattage and voltage they are, or where the components come from. EDIT: after over a month I finally got a replacement adapter from Fosi audio customer service (had to be shipped from HK). It’s a completely different adapter, literally rated for different amperes. It also has a different port than the original and no cable for it, so my amp is still useless. Fosi audio is so sketchy and I do not trust this thing.
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Reviewed in the United States on September 9, 2020 by Zack
Excellent performance and compact form factor, but needs better mounting options.
The Fosi Audio M03 delivers excellent performance and fully lives up to its technical specifications. Its compact form factor makes it incredibly easy to integrate and position within a desk setup. My only critique is the lack of a dedicated, manufacturer-supplied under-desk mounting bracket, which is a feature offered by some competing amplifiers in this segment. Offering an official mounting accessory would make this an flawless solution for minimalist or hidden audio setups. Overall, it is a fantastic piece of hardware that I highly recommend.
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Reviewed in the United States on June 10, 2026 by Ryan