Fosi Audio V3 Mono Monoblock Power Amplifier

Fosi Audio V3 Mono

Next-Gen Monoblock Power Amplifier

300W | Balanced Input | Ventilation

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Reviews are in...

The V3 monoblocks’ overall attitude is quite energetic and upfront. It means the Fosi Audio is never less than an engaged and engaging listen.

It is incredible how far these small amplifiers have come. It is the result of a manufacturer listening to our needs.

Fosi created a unit with much better driving power, a much better sonic quality, improved resolution, and a wider sound with inherently better separation and lower background noise.

The V3 Mono form factor feels unapologetically tiny. And, for anyone seeking a stealthy amp to pair with their desktop speakers, this one will be hard to beat.

Hear what they are saying

It is my pleasure to recommend Fosi Audio V3 Mono amplifier.

All l can say is wow! It is incredible how far these smallamplifiers have come, lt is the result of a manufacturer listening to our needs,implementing features such asbalanced and trigger inputs,and proper feedback mechanism to essentially eliminate load dependency.lcan't imagine asking for more from Fosi when it comes tosuch an amplifier. Everything is as good as you could possibly want, it is my pleasure to recommend Fosi AudioV3 Mono amplifier.

Another Milestone Amp Crafted for Audiophiles

In 2023, following the launch of the V3 stereo amplifier, we received numerous valuable suggestions and feedback from our users.

There are still points to be improved, such as the adoption of PFFB, but I expect further improvements in the future. --Toku from ASR

It would be great if there was the PFFB, as Toku mentions, also no load dependency --ModDIY from ASR

With balanced inputs and volume bypass ... this amp will be killer, even with a higher price tag (under 200 USD?) --mike70 from ASR

I wish that they offered a mono block version (based on the V3). No volume pot. Simplified signal path. --markg4331 from Youtube

I would have preferred a toggle on/off switch instead of the on/off switch being integrated on the volume pot. --cyclo from ASR

We listen intently, record diligently, and develop with dedication, ultimately striving to transform your suggestions and ideas into reality—the V3 mono.

PFFB Load Independence

Swappable Op-Amp Design

240W Rated Power Output

All-Aluminum Alloy Chassis

Full-Body Cooling Design

XLR Input

RCA Input

PFFB Load Independence

XLR Input

RCA Input

Swappable Op-Amp Design

Full-Body Cooling Design

All-Aluminum Alloy Chassis

240W Rated Power Output

PFFB Post-Filter Feedback Technology

Significantly reduces distortion, enhances linearity and frequency response, and improves sound purity and system efficiency.

Reproducing the Purest Sound
Recreating Every Detail

Effectively reduces the output impedance, thereby increasing the damping factor for tighter and more precise speaker response.

Load Dependence Defeating
Overcoming the Pain Point of Class-D Amps

Reduces output filter impact, boosts frequency response for balanced, natural tones, ensuring true reproduction.

240W Rated Power Output

Crafts an enriching, immersive sound experience, satisfying your craving for superior musical quality with unmatched audio richness.

Pure Sound, Accurate Imaging
with Zero Crosstalk

Enhances stereo depth and soundstage accuracy through precise power and channel separation

for a purer audio experience.

Compact and Exquisite
With Minimalist Design

Effortlessly integrates into various settings like home theater, study room, desktop and studios without occupying too much space.

All-Aluminum Alloy Chassis
Sturdy and Durable

Durably built from a single CNC-machined aluminum alloy piece, showcasing a robust and refined high-quality design.

Premium Internal Components

Carefully selected top-tier components are dedicated to crafting extraordinary sound quality,

making every listening a pure delight.

Japanese NICHICON

63V/2200μF Filtering Capacitors

Title

Eliminates the poor contact issues of traditional physical switches, ensuring stable and pure sound transmission.

German WIMA

Coupling Capacitors

Title

Provide exceptional sound quality and signal stability, greatly enhancing the audio experience.

Japanese Sumida

SMD Inductors

Title

Offer superior signal purity and noise reduction, elevating the amplifier's sound performance.

ELNA, Japan

Audiophile-Grade Capacitors

Title

Ensure enhanced audio clarity and stability, contributing to a richer sound experience

Japanese NICHICON

63V/2200μF Filtering Capacitors

Title

Eliminates the poor contact issues of traditional physical switches, ensuring stable and pure sound transmission.

German WIMA

Coupling Capacitors

Title

Provide exceptional sound quality and signal stability, greatly enhancing the audio experience.

Japanese Sumida

SMD Inductor

Title

Offer superior signal purity and noise reduction, elevating the amplifier's sound performance.

ELNA, Japan

Audiophile-Grade Capacitors

Title

Ensure enhanced audio clarity and stability, contributing to a richer sound experience

Flexibility

Adaptable to Various Scenarios

Offers enjoyment across various settings, from home theaters to professional studios, ensuring a versatile music experience.

CONVENIENCE

Supports XLR Balanced and RCA Inputs
Easily Switchable with a Toggle

Provides you with flexible connectivity options that are easily adapted for both home and professional scenarios.

V3 MONO Supports XLR Balanced and RCA Inputs

XLR Balanced Input
Enhanced Interference Resistance

Ensures stable audio transmission for a precise, clear listening experience, fulfilling the quest for supreme sound quality.

RCA Input
with 25dB and 31dB Gain Selection

Enhances source adaptability and audio clarity, reducing distortion and overload risk, suitable for various audio setups.

FEATURES

Swappable Op-Amp Design

Easily replaceable DIP8 dual discrete op-amps, meeting your pursuit of a personalized audio experience.

Four-Layer PCB Design
All for Superior Sound Quality

Boosts signal stability and audio purity, enhancing performance and interference resistance for superior sound output.

Auto Standby Mode
High Energy Efficiency

Automatically enters standby after 10 minutes of no signal input, extending device lifespan and reducing power consumption.

Advanced Cooling Design

Guarantees long-term efficient operation of the amp, prevents overheating,

and maintains consistent sound quality and device longevity.

Side Ventilation
More Effective Cooling

Boosts heat dissipation efficiency for superior performance and stable sound quality, ensuring enhanced air circulation.

Dust-Proof Filter Screens
Aesthetic and Practical

Effectively blocks dust without compromising cooling, ensuring long-term stability and enhancing product durability.

Optional 48V/10A Power Supply

Provides stable and robust power support, ensuring high-fidelity sound

quality to meet diverse audio playback demands.

Powers Two V3 MONOs Simultaneously

With a power supply splitter cable, a single PSU can supply power to two amps, saving space and maintaining tidiness, offering you more flexible combination solutions.

Measurements

Rated Power Output (1kHz, THD 1%)

Max Power Output (1kHz, THD 10%)

SINAD

SNR

Specifications

Channel: 1.0

Amplifier Chip: Texas Instruments TPA3255

Input: RCA, XLR, ¼" TRS

Output: Speaker Output (supports banana plug or bare wire connection)

SINAD: XLR: 101dB ; RCA: 93dB

SNR: ≥123dB

Dynamic Range: ≥123dB

THD: ＜0.006%

Gain: XLR/¼” TRS: 20dB ; RCA: 25dB, 31dB;

Terminal Impedance: 2-8Ω
Rated Power Output: 48V/5A--240W@4Ω ; 32V/5A --100W@4Ω

Frequency Response: 10Hz-30kHz（±0.06dB）

Input Voltage Range: DC 32-48V

Standard PSU: 48V/5A

Power Output with Various PSUs

PSU

Load Impedance

Rated Power

(1kHz, THD 1%)

Max Power

(1kHz, THD 10%)

4Ω

100W

130W

32V/5A

6Ω

65W

80W

8Ω

55W

65W

4Ω

240W

300W

48V/5A

6Ω

160W

200W

8Ω

120W

150W

Reviews are in...

Hear what they are saying

Another Milestone Amp Crafted for Audiophiles

PFFB Post-Filter Feedback Technology

Reproducing the Purest Sound Recreating Every Detail

Load Dependence Defeating Overcoming the Pain Point of Class-D Amps

240W Rated Power Output

Pure Sound, Accurate Imaging with Zero Crosstalk

Compact and Exquisite With Minimalist Design

All-Aluminum Alloy Chassis Sturdy and Durable

Premium Internal Components

Japanese NICHICON

63V/2200μF Filtering Capacitors

German WIMA

Coupling Capacitors

Japanese Sumida

SMD Inductors

ELNA, Japan

Audiophile-Grade Capacitors

Japanese NICHICON

63V/2200μF Filtering Capacitors

German WIMA

Coupling Capacitors

Japanese Sumida

SMD Inductor

ELNA, Japan

Audiophile-Grade Capacitors

Flexibility

Adaptable to Various Scenarios

CONVENIENCE

Supports XLR Balanced and RCA Inputs Easily Switchable with a Toggle

XLR Balanced InputEnhanced Interference Resistance

RCA Inputwith 25dB and 31dB Gain Selection

FEATURES

Swappable Op-Amp Design

Four-Layer PCB Design All for Superior Sound Quality

Auto Standby Mode High Energy Efficiency

Advanced Cooling Design

Side Ventilation More Effective Cooling

Dust-Proof Filter Screens Aesthetic and Practical

Optional 48V/10A Power Supply

Powers Two V3 MONOs Simultaneously

Measurements

Reproducing the Purest Sound
Recreating Every Detail

Load Dependence Defeating
Overcoming the Pain Point of Class-D Amps

Pure Sound, Accurate Imaging
with Zero Crosstalk

Compact and Exquisite
With Minimalist Design

All-Aluminum Alloy Chassis
Sturdy and Durable

Supports XLR Balanced and RCA Inputs
Easily Switchable with a Toggle

XLR Balanced Input
Enhanced Interference Resistance

RCA Input
with 25dB and 31dB Gain Selection

Four-Layer PCB Design
All for Superior Sound Quality

Auto Standby Mode
High Energy Efficiency

Side Ventilation
More Effective Cooling

Dust-Proof Filter Screens
Aesthetic and Practical