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

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

Q: If the power going in to this unit is 32v 5amp = 160 watts. How is this unit rated 300 watts?

I tested the continuous wattage output using the 32v 5amp supply that comes with it. I get 50 watts driving 8 ohm, 100 watts driving 4 ohm and 200 watts driving 2 ohm. I tested with a scope and sine wave. You get about 20 volts RMS before the sine wave starts to square off at the peaks. The 50 watts at 8 ohms is surprisingly loud but my 8 ohm speaker is very efficient Electrovoice EVM15 in a Thiel box.

Q: I can't seem to fine the rms watts. does anyone know the true specs? power at 2 ohms, at four ohms. peak does not mean much.

I put it on an oscilloscope and fed it a sine wave across a 2 ohm, 4 ohm and 8 ohm load resistor. Using the power supply that it comes with this unit (32V 5A) I see the sine wave start to clip right around 20 volts RMS. It works out to 50 watts with an 8 ohm load, 100 watts with 4 ohm load and 200 watts with a 2 ohm load.

Q: What is the maximum voltage and current can be used as it comes with 32VDC at 5 amp.

The power supply current rating of 5A is not quite enough to get the maximum rated output, but it doesn't fall short by much. There are tradeoffs with duty cycle, thermal management, equipment life, program spectral characteristics, etc. but they don't really amount to more than giving precision to common sense. All you need to know is that you can always use a higher current supply without any concern. A 10A supply will run cooler, longer, and cleaner. It is the voltage that has to be in bounds and for this chip TI specifies the working range to be 24-35V and the maximum power to be 300 Wrms. If you want to upgrade get a 36V unit rated over 300 watts, e.g. Mean Well MW LRS-350-36 (9.7A) AND turn the voltage down to 35V or less.

4.3/5

Product ID: 340379785

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Details

Item dimensions L x W x H
13 x 10.5 x
Voltage
32 Volts
Manufacturer
‎Fosi Audio
Maximum Supply Voltage
32 Volts
Mounting Type
Surface Mount

⚡200W max power output

🔊Full-frequency & subwoofer switchable

🛠️Texas Instruments TPA3255 chip

Frequently Bought Together

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

FosPower RCA Y-Adapter (3 Feet), 1 RCA Male to 2 RCA Male Short Y Splitter Digital Stereo Audio Cable for Subwoofer, Home Theater, Hi-Fi - Dual Shielded | 24K Gold Plated

Dayton Audio IOSUB 10" IP66 Subwoofer 150 Watts RMS at 4 Ohms Impedance - Durable Weather-Resistant Indoor/Outdoor Speaker

Description

🎶 Elevate your audio game with power and precision — don’t just hear it, feel it!

COMPACT SLEEK - Space-saving design (13 x 10.5 x 3.5 cm) fits perfectly in any modern home theater or desktop setup.
READY FOR ACTION - Includes 32V/5A power supply and backed by an 18-month global warranty plus 24-month worry-free support.
CUTTING EDGE TECH - Equipped with TI’s PurePath Ultra-HD chip for ultra-low distortion and pristine sound clarity.
DUAL MODE FLEXIBILITY - Seamlessly switch between full-frequency mono amp and dedicated subwoofer mode to suit your setup.
POWERHOUSE PERFORMANCE - Delivers up to 200W of clean, distortion-free audio power for immersive sound.

The Fosi Audio M03 is a compact yet powerful 200W mono amplifier featuring a switchable full-frequency and subwoofer mode. Powered by the advanced Texas Instruments TPA3255 chip, it delivers ultra-low distortion and clean sound, perfect for home theaters or bookshelf speakers. With a sleek design, included power supply, and robust warranty, it’s engineered for audiophiles who demand premium sound quality and versatile performance.

Specifications

Item dimensions L x W x H	13 x 10.5 x 3.5 Centimeters
Voltage	32 Volts
Manufacturer	‎Fosi Audio
Maximum Supply Voltage	32 Volts
Mounting Type	Surface Mount
Brand	Fosi Audio
Number of Channels	1
Output Power	1.5E+2 Watts
Country of Origin	USA
Model number	M03
Colour	Black
Number of Memory Sticks	1
Item Weight	1 kg 90 g
Product Dimensions	13 x 10.49 x 3.48 cm; 1.09 kg
Item model number	M03
Item Height	1.37 Inches
Item Width	4.13 Inches
Wattage	200 Watts
Output Wattage	200 Watts
Included Components	1 electronic component amplifier
Are batteries included?	No

Have a Question? See What Others Asked

If the power going in to this unit is 32v 5amp = 160 watts. How is this unit rated 300 watts?

I can't seem to fine the rms watts. does anyone know the true specs? power at 2 ohms, at four ohms. peak does not mean much.

What is the maximum voltage and current can be used as it comes with 32VDC at 5 amp.

If using as a full-frequency mono amp to a passive speaker, can the RCA output still go to a powered sub with the frequency control for the sub only?

Reviews

4.3

All from verified purchases

N**K

Weak output..

Read reviews, bought the item with high expectation. But the sound output is weak. This amplifier is for active subwoofer, not for passive subwoofer. In short, this amplifier needs an amplifier.Update: After putting this amp aside for months, I recently found out that the "aux output of Aiyima A08 Pro" is the main culprit all along. I was wrong for pointing finger to this little champ. After feeding the right amount of power to its inputs, it rattles the windows. WOW...She deserves 5 Stars, not 3!

9.11.2023

S**.

Best Size package amplifier.

Best Size package amplifier for passive Subwoofer. Easyly handle 200W or more if you add 48V power supply.

7.05.2024

A**A

Ok for sony

Cheap and good. Not best. But it is good. 8inch sony passive sub. After some days static charged, feel better.Let's go...For it

16.11.2023

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Smooth transaction and product arrived in perfect condition.

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TrustScore 4.5 | 7,300+ reviews

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Customer service was outstanding when I had questions about the product.

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