Fosi Audio MC351
- 7 reviews
- Fosi Audio
Fosi Audio MC351
- 7 reviews
- Fosi Audio
$117.72
- Authorized Dealer · Tech Support · 30-Day Returns
Why it stands out
Best for
Not ideal for
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Setup guide
How to connect
What you should know
EMiUZEK buying notes
Frequently asked questions
View full technical specifications
Official product information provided by Fosi Audio
The following product descriptions, specifications and images are provided by the manufacturer.
Fosi Audio MC351 is a compact 2.1-channel integrated digital amplifier for passive stereo speakers and a passive subwoofer.
Dual TI TPA3255 amplifier chips, broad digital and analog inputs and up to 165W × 2 + 350W at 4Ω make it a practical control center for powerful 2.1 systems.
Why it stands out
Dedicated 2.1 amplification
Separate stereo and passive-subwoofer amplification builds a complete 2.1 system without a second power amp.
Dual TPA3255 architecture
Two TI TPA3255 amplifier chips provide high output for speakers and a passive subwoofer.
Broad source compatibility
Bluetooth 5.3, USB, optical, coaxial and RCA inputs cover common music, computer and TV sources.
System expansion through pre-out
The pre-out connection supports a powered subwoofer or compatible downstream equipment.
Best for
- Passive bookshelf or floorstanding speaker systems
- 2.1 systems using a passive subwoofer
- TV and desktop systems using optical, coaxial or USB audio
- Users who need both wireless and wired source inputs
Not ideal for
- Users needing HDMI ARC or TV-remote CEC control
- Headphone-only systems
- Turntables without a built-in or external phono preamp
EMiUZEK Buying Notes
- MC351 directly powers passive speakers and a passive subwoofer; these are different from line-level active speakers.
- USB is an audio-data input, not a power input.
- RCA is line level and does not replace a phono preamp for a standard turntable.
Frequently asked questions
Can MC351 drive passive speakers?
Yes. It is designed for 4–8Ω passive speakers.
Can it power a passive subwoofer?
Yes. It has a dedicated amplified passive-subwoofer output.
Can I connect a powered subwoofer?
Yes. Use the line-level pre-out with a compatible powered subwoofer.
Does it support HDMI ARC?
No. Use optical, coaxial or RCA audio from a television.
What does the USB port do?
It receives USB digital audio from a compatible computer or source; it does not power the amplifier.
Can I connect a turntable?
Only if the turntable has a built-in phono preamp or you add an external phono preamp.
HOW TO CONNECT
2.1 passive speaker system
Source: Computer, streamer or TV
Connection: USB, optical, coaxial, RCA or Bluetooth
Output: Speaker terminals + passive-subwoofer output
Target: Passive speakers + passive subwoofer
Note: Match speaker impedance and begin with low volume.
Stereo speaker system
Source: Any supported digital or analog source
Connection: Chosen input
Output: Left/right speaker terminals
Target: 4–8Ω passive speakers
Note: Leave the passive-subwoofer output unused for a 2.0 system.
System with powered subwoofer
Source: Any supported source
Connection: Chosen input
Output: Speaker terminals + pre-out
Target: Passive speakers + powered subwoofer
Note: Set crossover and level on the powered subwoofer.
Technical Specifications
Core specifications
| Feature | Specification |
|---|---|
| Product type | 2.1-channel integrated digital amplifier |
| Amplifier chips | TI TPA3255 × 2 |
| Maximum output | 165W × 2 + 350W at 4Ω |
| Speaker impedance | 4–8Ω |
| THD | ≤0.03% |
| SNR / Dynamic range | ≥100dB / ≥100dB |
| Power input range | DC 24–48V |
Inputs and outputs
| Feature | Specification |
|---|---|
| Inputs | Bluetooth 5.3, USB, optical, coaxial, RCA |
| Outputs | Passive speakers, passive subwoofer, pre-out |
| USB sampling | Up to 24-bit / 96kHz |
| Optical / coaxial sampling | Up to 32-bit / 192kHz |
| Frequency response | 20Hz–20kHz (±0.5dB) |
| Subwoofer output range | 20Hz–250Hz |
Recommended System Setup
| Setup | Connection |
|---|---|
| 2.1 passive system | Source → MC351 → Passive speakers + passive subwoofer |
| TV system | TV optical output → MC351 → Passive speakers |
| Powered sub expansion | Source → MC351 → Passive speakers + pre-out → Powered subwoofer |
Additional Product Content
Fosi Audio product comparison
Compare the two compact Fosi Audio integrated amplifiers by their power, output structure and intended system layout.
| Feature | MC351 | MC331 |
|---|---|---|
| Product position | High-power 2.1 digital integrated amplifier | Tube DAC / integrated stereo amplifier |
| Built-in speaker amplifier | Yes | Yes |
| Maximum output | 165W × 2 + 350W at 4Ω | 105W × 2 at 4Ω |
| Main inputs | Bluetooth 5.3, USB, optical, coaxial, RCA | Bluetooth, USB, optical, coaxial, RCA |
| Speaker output | Stereo passive speakers | Stereo passive speakers |
| Passive subwoofer output | Yes, dedicated amplified output | No |
| Line-level pre-out | Yes | Yes |
| Headphone output | No | Yes, 3.5mm |
| Tube stage | No | Yes, replaceable tubes |
| Best use | Powerful passive-speaker 2.1 system | Compact tube stereo and headphone system |
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