The MC351 is an Integrated Amplifier with built-in DAC by Fosi Audio that delivers 165 watts x 2 channels into 4 ohms plus 350 watts on the subwoofer channel. Fosi publishes no 8 ohm rating. It was released in 2025. It is a 2-channel design using a Class D output stage. Speakers connect via Binding Post. Minimum impedance of 4 ohms makes the MC351 compatible with a wide range of loudspeakers. Thanks to its built-in DAC, you can play digital sources directly without the need for an external DAC unit. Fosi Audio MC351 has an MSRP of 190$.
There are 2 Fosi Audio amplifiers in our database. Below you can see the main specs of these amps.
Fosi Audio Integrated Amplifier Series
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Performance Specs
One of the most important factors when deciding on an integrated amplifier is its power ratings and compatibility with your speaker's impedance requirements.The Fosi Audio MC351 is rated at 165 watts RMS into 4-ohms. Fosi Audio provides this wattage at a THD (Total Harmonic Distortion) of 0.03% which is an important indicator of distortion at the given values (lower THD is better).
Here are the main highlights of its performance specs:
- 165 watts into 4-ohms
- 4-ohms Min Impedance (allows compatibility with a wide range of loudspeakers)
- 100dB Signal to Noise Ratio
Wiring more than one pair of speakers to it? Check the load first →
When pairing the Fosi Audio MC351 with a passive Bookshelf (Stand mount) or Passive Floor Standing (Tower) speaker, you have to check if their Max Power Range is below the max wattage of the amp for the given impedance levels.
Operating your amp outside of this max range may damage the speakers.
Inputs and Outputs
Besides the performance specs of the Fosi Audio MC351, the next important feature set that you have to evaluate is the input and output selections that it offers.
Fosi Audio MC351 has total of 1 Analog inputs .
Inputs
- Total Number of Analog Inputs: 1
- Yes Optical Digital Input
- Yes Coaxial Digital Input
- USB Input:
Outputs
- Speaker Outputs
- Stereo RCA pre out Preamp Outputs
- Subwoofer Output (1)
Bluetooth Connectivity
Fosi Audio MC351 features built-in Bluetooth for wireless music streaming from your Bluetooth-enabled devices such as Apple iPod/iPhone/iPad, Android smartphone/tablet, Windows PC, Mac computers/laptops.
Among the amps in the same price range, these are the 5 amps that have Bluetooth Connectivity:
Phono Input
Fosi Audio MC351 doesn't have a phono input so in order to play your vinyl albums, Fosi Audio MC351 has to be paired with a Phono Preamp that is MM (Moving Magnet) or/and MC (Moving COil) depending on your cartridge type.
Subwoofer Output
Fosi Audio MC351 has Stereo RCA preamp outputs which can be used to connect to a powered subwoofer via an RCA cable ( as long as your sub supports this connection).
Check our
Powered Subwoofers page to find a subwoofer that will work with Fosi Audio MC351 amp and your speakers.
DAC and Digital Music
The Fosi Audio MC351's built-in DAC allows the connection of digital sources directly, eliminating the need for an external DAC.
Fosi Audio MC351 External Dimensions and Weight
Fosi Audio MC351 has external dimensions of (H x W x D) 2-1/4 x 7-1/4 x 5 inch (56.9 x 184.9 x 127 mm ).
Base Surface Area
Base surface area of an integrated amplifier may become an important decision factor when the space in your room or desk is limited.
The base area of the Fosi Audio MC351 is approximately 234.8cm2 / 36.4inch2.
- Width: 184.9mm (7-1/4")
- Height: 56.9mm (2-1/4")
- Depth: 127.0mm (5")
- Weight: —
- Base Surface Area: ~234.8cm2 / 36.4inch2
- Volume: ~1.3 liter / 0.4 gallon
Available colors
Fosi Audio MC351 is available in Black color options.
| General |
| Brand |
Fosi Audio |
| Full Model Name |
Fosi Audio MC351 |
| Release Date |
2025 |
| Amplifier Type |
Integrated Amplifier |
| Number of Channels |
2 |
| Amp Class |
Class D |
| Amplifier Technology |
Solid State |
| Performance |
| Watts RMS per Channel into 8-ohms |
N/A |
| Watts RMS per Channel into 6-ohms |
N/A |
| Watts RMS per Channel into 4-ohms |
165 watts |
| Frequency Bandwidth |
|
| THD |
0.03% |
| Minimum Impedance |
4 |
| Signal to Noise Ratio |
100 dB |
| Digital Music |
| Built-in DAC |
Yes |
| Bluetooth |
Yes |
| WiFi |
No |
| CONNECTIONS |
| Total Analog Inputs |
1 |
| Phono Input |
No |
| Optical Digital Inputs |
Yes |
| Coaxial Digital Inputs |
Yes |
| USB Input |
Yes |
| Preamp Outputs |
Stereo RCA pre out |
| Headphone Output |
No |
| Subwoofer Output |
Yes |
| Removable Power Cord |
|
| Speaker Connectors |
Binding Post |
| PHYSICAL SPECS |
| Height |
56.9mm (2-1/4") |
| Width |
184.9mm (7-1/4") |
| Depth |
127.0mm (5") |
| Weight |
— |
| Available Colors |
Black |
| OTHER |
| Parts Warranty |
|
| Labor Warranty |
|
How much power does the Fosi Audio MC351 have?
The Fosi Audio MC351 delivers 165 watts x 2 channels into 4 ohms plus 350 watts on the subwoofer channel. Fosi publishes no 8 ohm rating.
Does the Fosi Audio MC351 use vacuum tubes?
No. The Fosi Audio MC351 is a solid-state amplifier - there are no vacuum tubes in it.
What amplifier class is the Fosi Audio MC351?
The Fosi Audio MC351 uses a Class D amplifier design. Class D is a modern switching design that runs cool and wastes very little energy as heat, which is how makers fit high power into a compact, light chassis.
Does the Fosi Audio MC351 have a built-in DAC?
Yes. The Fosi Audio MC351 has a built-in DAC, so you can feed it a digital source directly without buying a separate converter.
Can I connect a turntable to the Fosi Audio MC351?
No. The Fosi Audio MC351 has no phono input, so a turntable needs an external phono preamp (or a deck with one built in) before it can be connected.
Does the Fosi Audio MC351 have Bluetooth?
Yes. The Fosi Audio MC351 supports Bluetooth, so you can stream straight from a phone, tablet or laptop.
Can I connect a subwoofer to the Fosi Audio MC351?
Yes. The Fosi Audio MC351 has a subwoofer output, so you can add a powered subwoofer to extend the low end below what your main speakers manage.
Does the Fosi Audio MC351 have a headphone output?
No. The Fosi Audio MC351 does not have a headphone output, so headphone listening needs a separate headphone amplifier.
How much does the Fosi Audio MC351 cost?
The Fosi Audio MC351 has a manufacturer's list price (MSRP) of $190.
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