Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers, Mini Monoblock Class D Amp with TPA3255, 240W for HiFi Home Theater AVR Receiver Component, RCA/XLR Balanced Inputs with 48V/5A Power Supply : �鶹��.ca: Electronics

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Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers, Mini Monoblock Class D Amp with TPA3255, 240W for HiFi Home Theater AVR Receiver Component, RCA/XLR Balanced Inputs with 48V/5A Power Supply

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164 ratings

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Purchase options and add-ons

Item dimensions L x W x H	14.2 x 10.7 x 4.1 Centimetres
Voltage	48 Volts
Manufacturer	Fosi Audio
Maximum supply voltage	48 Volts
Mounting type	Freestanding
Brand	Fosi Audio
Number of channels	1
Operating temperature	23 Degrees Celsius
Output power	2.4E+2 Watts
Package type	cardboard box

About this item

Mini Monoblock Amplifier: Crafted for HiFi audiophiles, the V3 Mono allows you to drive a single passive speaker with one amp, delivering up to 240W @4Ω of rated power. It offers the flexibility to build your home audio 2/3/4/5-channel system effortlessly. The V3 Mono can serve as a power amplifier for multi-channel AVRs, complementing the output power to easily drive high-power speakers in home theater systems
Innovative Cutting-Edge Technology: Fosi Audio has achieved a technological breakthrough through independent research and development by applying PFFB (Post-Filter Feedback) technology to the V3 Mono for the first time. This effectively overcomes the common load dependency issues of Class-D amplifiers, improving distortion and enhancing frequency response, thereby significantly enhancing sound quality and performance
Audiophile-Grade Components: The V3 Mono incorporates the high-end TPA3255 Class-D amp chip, paired with well-known components such as Japanese Nichicon filter capacitors, ELNA capacitors, German WIMA capacitors, and Japanese Sumida inductors, etc. Additionally, it features an upgraded four-layer PCB. This combination not only ensures high power output but also achieves a THD as low as 0.006%, a SINAD of 101dB, and an SNR of 123dB. As a result, the fidelity and quality of the audio are assured
Advanced Cooling: Utilizing Fosi Audio's pioneering full-body heat dissipation design, the TPA3255 amplifier chip is placed at the bottom and tightly integrated with the chassis, allowing heat to be effectively dissipated through the casing. Coupled with dual side ventilation holes that enhance internal airflow, this ensures the V3 Mono can deliver stable, high-power output over extended periods
User-Friendly Design: Supports both XLR/¼" TRS balanced and RCA single-ended(with gain selection) inputs, with an easy toggle switch for selection. Additionally, it features an auto power/signal sensing mode to enhance energy efficiency. You can also customize your preferred sound signature by replacing the stock NE5532 op-amps, supporting DIP8 dual discrete op-amps. For example, it will work with Sparkos SS3602, MUSES02, OPA2604, Burson V5i, V6, V7, and more. Note: Please ensure that the device is powered off when connecting the speaker cable

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This item: Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers, Mini Monoblock Class D Amp with TPA3255, 240W for HiFi Home Theater AVR Receiver Component, RCA/XLR Balanced Inputs with 48V/5A Power Supply

$180.49

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FosPower Banana Plugs 12 Pairs / 24 pcs, Closed Screw 24K Gold Plated Banana Speaker Plug Connectors for Speaker Wire, Wall Plate, Home Theater, Audio/Video Receiver, Amplifiers and Sound Systems

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Technical Details

Brand	‎Fosi Audio
Manufacturer	‎Fosi Audio
Place of Business	‎Fosi Audio
Model	‎V3 Mono
Part Number	‎un pezzo
Mounting Hardware	‎Quick Start Guide
Number of Items	‎1
Output Wattage	‎240 Watts
Voltage	‎48 Volts
Batteries included	‎No
Batteries Required	‎No
Signal-to-noise ratio (dB)	‎123 dB
Mounting type	‎Freestanding
Does it contain liquid?	‎No
Manufacturer	‎Fosi Audio
Language	‎English
Item model number	‎V3 Mono
Product Dimensions	‎14.2 x 10.67 x 4.09 cm; 750 g
ASIN	‎B0D31M3DXY

Additional Information

Date First Available	July 10 2024
Customer Reviews	164 ratings 4.4 out of 5 stars
�鶹�� Rank	#23,358 in Electronics (See Top 100 in Electronics) #89 in Audio Component Amplifiers

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Compare with similar items

	This Item Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers, Mini Monoblock Class D Amp with TPA3255, 240W for HiFi Home Theater AVR Receiver Component, RCA/XLR Balanced Inputs with 48V/5A Power Supply	Recommendations 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 ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply	�� Fosi Audio TP-02 Subwoofer Amplifier Home Audio, Mini Bass Amp Mono Subwoofer Amp, with TDA7498E Chip 220W Volume and Frequency Control, for Powered Passive Subwoofers Bass Shakers	�� Fosi Audio TB10D 2 Channel Stereo Amplifier, Class D Mini Power Integrated Amplifiers 600W for Passive Speakers/Bass Shaker, Home Audio Component Desktop Amp Receiver TPA3255 with Bass Treble Control	�� Fosi Audio M04 Subwoofer Amplifier for Home Theater Mono Channel Digital Class D Integrated Power Amp for Passive Speakers Subwoofer Rated 100W MAX
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Price	-5%��$180.49 Was: $189.99	$109.99	$199.99	$89.99	$109.99	-10%��$62.99 Was: $69.99
Delivery	Get it by Friday, Jun 13	Get it by Friday, Jun 13	Get it by Friday, Jun 13	Get it by Friday, Jun 13	Get it by Friday, Jun 13	Get it by Friday, Jun 13
Customer ratings	4.4164	4.1690	4.6614	4.6738	4.51,185	4.4429
Sold by	Fosi Audio	Fosi Audio	Fosi Audio	Fosi Audio	Fosi Audio	Fosi Audio
number of channels	1	1	2	1	2	1
voltage	48 volts	32 volts	48 volts	24 volts of direct current	230 volts	230 volts
output power	240 watts	200 watts	235 watts	220 watts	600 watts	100 watts
specification met	—	—	—	FCC	FCC	[Inf] Thd <= 0.04% and Frequency Range 20hz - 120hz
mounting type	Freestanding	Tabletop Mount	Surface Mount	Tabletop Mount	Tabletop Mount	Tabletop

From the brand

Amplifying Your Voice, Shaping Our Innovation

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.
Stereo Mini Power Amplifier
50W-300W Amps for your choice!

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DAC Amplifier for you!

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Phono Preamp for You !

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Preamp & headphone amp !

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Product Description

Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers

The Next-Gen Monoblock

Fosi Audio V3 Mono Mini Power Amplifier

A debut Class D audio amplifier with PFFB technology to significantly improve sound purity and system efficiency, offering a flexible solution to your home audio system.

Continuation of Co-Creation

Engineered for Audiophiles - Optimal Choice for Home Audio Systems

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

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

Input: RCA, XLR, ¼" TRS; Output: Passive Speaker (supports banana plug or bare wire connection)
SINAD: XLR--101dB; RCA--93dB; SNR: ≥123��
Rated Power Output: 48V/5A 240W@4Ω; 32V/5A 100W@4Ω

Post-Filter Feedback Technology Integrated

Significantly reduces distortion and enhances linearity, frequency response to get superior sound.
Compact Yet Powerful

Crafts an immersive sound experience, satisfying your craving for superior musical quality.
Accurate Imaging with Zero Crosstalk

Enhances stereo depth and soundstage accuracy for a purer audio experience.
Easily Replaceable DIP8 Dual Discrete Op-amps

Meeting your pursuit of a personalized audio experience.

Provides You with Flexible Connectivity Options

Effortlessly switched by a toggle switch, easily adapted for both home and professional scenarios.
Advanced Cooling Design

Guarantees long-term efficient operation of the amp, prevents overheating.
With Minimalist Design

Effortlessly integrates into various settings like home theater, study room, desktop, and studios.
Automatic Signal Sensing

Enters standby after 10 minutes of no signal input, effectively reducing power consumption.

Premium Internal Components

NICHICON Caps, Japanese

Ensure superior sound clarity, longevity, and stable electrical performance, enhancing the fidelity of audio reproduction.

WIMA Caps, German

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

ELNA Caps, Japan

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

Sumida Inductor, Japanese

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

Comparison

	V3 Mono	V3	TB10D	ZA3	MC101 Buying Options	48V 5A GaN	48V10A
Customer Reviews	164	1,062	1,185	614	—	27	12
Type	Mono Amplifier	2.0 CH Amp	2.0 CH Amp	2.0 CH Mono Amp	Bluetooth 2.0 CH Amp	48V GaN Power Supply	48V10A Power Supply
MAX Power Output	300W	300W x 2	300W x 2	190W x2/ 300W x1	100W x 2	240W	480W
Input	RCA + XLR + ¼" TRS	RCA	RCA	��䴡+�ݳ��+¼”T�鳧	Bluetooth + RCA	-	-
Output	Passive Speaker	Passive Speakers+Pre-Out	Passive Speakers	Passive SPK +Sub-out	Passive Speakers+Pre Out	-	-
Treble & Bass Control	✘	✘	✔	✘	✔	✘	✘
THD	<0.006%	<0.003%	≤ 0.3%	<0.006%	≤0.03%	-	-
SNR	≥123��	≥110��	≥ 90dB	≥106��	≥100��	-	-
Terminating Impedance	2-8 Ohm	2-8 Ohm	2-8 Ohm	2-8 Ohm	4-8 Ohm	-	-
Power Adapter	48V/5A	32V/5A	32V/5A	48V/5A	24V/4.5A	48V/5.0A	48V/10A
Work Voltage	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V	AC 110V - 240V

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Customer reviews

164 global ratings

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Customers say

Customers like the sound quality, power, and build quality of the electronic component amplifier. They mention the midrange is clear and open, highs are not shouty, and the sonic dynamics are outstanding. Customers also say the amplifier drives their Wharfedale 6 ohm towers effortlessly to 90db without any audible strain.

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Sound quality Power Build quality

11 customers mention "Sound quality"11 positive0 negative

Customers like the sound quality of the product. They mention the midrange is clear and open, the highs are not shouty, and the sonic dynamics are outstanding.

"...Well, 5 hours later and wow!! What a difference! The sound-stage is deep, wide and very clear, with no shortage of power, that's for sure!..." Read more

"...Those two amps just deliver, I have the best soundstage I've ever had. Wide open!..." Read more

"Very happy with both sound and build quality. Highly recommend" Read more

"...I focus instead on my experience. I will say that the sound quality is excellent to my ears. I ordered two units...." Read more

8 customers mention "Power"6 positive2 negative

Customers like the power of the product. They mention it's decent and doesn't have a shortage of power. Some say it drives their Wharfedale 6 ohms towers effortlessly to 90db without any audible strain.

"...The sound-stage is deep, wide and very clear, with no shortage of power, that's for sure!..." Read more

"...Pretty disappointing. With that said, I’m sure the amp is good and would perform well in a different scenario as I already have two Fosi ZA3..." Read more

"...These mono blocks drove my towers effortlessly to 90db without any audible strain...." Read more

"...Incredible sound stage and power. I didn’t know my speakers were capable of such detail. For the value you can’t beat it!..." Read more

3 customers mention "Build quality"3 positive0 negative

Customers are satisfied with the build quality of the product. They mention it's small and solid-looking.

"Very small and solid looking amp. Very affordable too, this is why I wasn’t expecting too much on sound quality...." Read more

"Fantastic sounding amp. Great build quality." Read more

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Top reviews from Canada

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Graeme N.
An astonishing piece of HiFi gear!
Reviewed in Canada on January 22, 2025
Verified Purchase

I had read some reviews, as I am interested in this market a lot, already owning a Fosi V3 and a pair of Aiyima A07 Max's... I had very high hopes for the Fosi V3 mono amps, and was not disappointed! Fresh out of the box they were a little tight and congested sounding, just a bit-no blooming of the sound...
Well, 5 hours later and wow!! What a difference! The sound-stage is deep, wide and very clear, with no shortage of power, that's for sure! They sound so good they have already replaced my other monoblock amps! Bass is deep and very tight, the midrange is clear and open, highs are not shouty but again clean and well balanced top end. Excellent input choices (RCA and XLR) and simple controls... Having heard several of these TI 3255 chip amps, all have a similar sound, but the additional realism of the V3 mono is quite audible! And you can swap audio op-amps as well! A killer deal on the amps right now! Buy a pair- you won't regret it! :)

Edit: I've been listening to these V3 mono amps for about a week now, and I am BLOWN away by the amount of sound these amps reproduce! True giant killers! I'm more than pleased with these amps! Buy some! :)

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2 people found this helpful

Helpful

P.M.
The hunt is over.
Reviewed in Canada on July 27, 2024
Verified Purchase
I was looking for monoblocks. Decent monoblocks. And, I'm a fan of Fosi Audio products. I basically own everything they made in the last year. Been waiting for those a long while.

Well. Now.... The hunt is over.

Price range is more than adequate, it's a steal. Those two amps just deliver, I have the best soundstage I've ever had. Wide open! Plugged directly into my Dac of choice, the topping d50 III, I'm in audio heaven.

I love the simplicity of the V3 mono, but the features of the little amp, like auto shut down/turn on, xlr and rca inputs, gain switch. Shipped with two 48v PSUs. I've never had a better setup (using monoblocks, cause I could not afford having monoblocks before). I actually use a 32V psu, it's plenty for my needs, and hey, it's fosi parts, they are compatible.

Truly, I'm done with trying to find monoblocks that can perform. The Fosi V3 mono IS what I was looking for, so glad of my purchase.

I will update review in a few weeks when burn in is done.

Read more

P.M.

The hunt is over.

Reviewed in Canada on July 27, 2024
I was looking for monoblocks. Decent monoblocks. And, I'm a fan of Fosi Audio products. I basically own everything they made in the last year. Been waiting for those a long while.

Well. Now.... The hunt is over.

Price range is more than adequate, it's a steal. Those two amps just deliver, I have the best soundstage I've ever had. Wide open! Plugged directly into my Dac of choice, the topping d50 III, I'm in audio heaven.

I love the simplicity of the V3 mono, but the features of the little amp, like auto shut down/turn on, xlr and rca inputs, gain switch. Shipped with two 48v PSUs. I've never had a better setup (using monoblocks, cause I could not afford having monoblocks before). I actually use a 32V psu, it's plenty for my needs, and hey, it's fosi parts, they are compatible.

Truly, I'm done with trying to find monoblocks that can perform. The Fosi V3 mono IS what I was looking for, so glad of my purchase.

I will update review in a few weeks when burn in is done.

Images in this review

5 people found this helpful

Helpful

Krista
Don't let the size fool you
Reviewed in Canada on February 13, 2025
Verified Purchase
Very happy with both sound and build quality. Highly recommend

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One person found this helpful

Helpful

Just a Techie
An excellent mono block at an affordable price
Reviewed in Canada on September 23, 2024
Verified Purchase
There are many many reviews of the V3 Mono out there. I am not going to attempt to reproduce what is covered better elsewhere. I focus instead on my experience. I will say that the sound quality is excellent to my ears.

I ordered two units. One unit did not properly enter standby mode. I contacted the manufacturer and their support was disappointing. I waited days for a response. First it was suggested that I upgrade my RCA cables, then it was suggested that I run some tests in order to see if the unit met Fosi’s definition of defective. I eventually opted to return and repurchase the defective unit through �鶹��. I actually had the replacement unit up and running before getting a second response from Fosi. The second unit worked as expected.

At the time I purchased the units, the 48V 5A power supplies did not have any third party certification. Fosi was able to supply documentation from the PSU manufacturer that they have obtained ETL certification.

I am very happy with the amplifiers, I am disappointed with the service. To Fosi’s credit I did receive a survey asking me to rate their service.

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2 people found this helpful

Helpful

guy
Decent power for these little amps
Reviewed in Canada on August 6, 2024
Verified Purchase
Good for desktop use at the very leas; perhaps not powerful enough for a large room. It does run hot since the entire case is used as a heat sink. So it needs to be put somewhere it can exhaust the heat.
As for the sound (paired with a topping E50 using xlr), I can't really tell the difference compared to a yamaha avr, while not being pushed hard. Way I see it, amp doesn't cause distortion and is neutral. Don't expect something game changing unless your speakers are power starved.

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Helpful

Dmitry
This is the future of HiFi
Reviewed in Canada on January 14, 2025
Verified Purchase
Contemplated the purchase ever since the amp was announced through Kickstarter by Fosi Audio and have been closely following early production samples reviews as well as reviews for the final version which is now available on �鶹��. Stunning doesn't even begin to describe it, channel separation, sonic dynamics are outstanding. I had them them connected to my SMSL DO100 DAC via RCA jacks and the improvement in sound quality over my trusty Yamaha R-S700 receiver was quite noticeable. I then connected the amps using XLR cables to my DAC and that took things way further. Whoever said there was no noticeable sonic difference between RCA and XLR was dead wrong because there is a difference. Get these little gems and you won't be disappointed.

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Helpful

AV Enthusiast
Possibility for old stock with defective reverse polarity output
Reviewed in Canada on December 11, 2024
Verified Purchase
These little guys are great for what they are, but be careful because if they only have one QC sticker on the bottom like the attached picture, the output polarity is reversed. It was a design flaw. They have corrected as far back as August, but �鶹�� seems to have old stock.

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AV Enthusiast

Possibility for old stock with defective reverse polarity output

Reviewed in Canada on December 11, 2024
These little guys are great for what they are, but be careful because if they only have one QC sticker on the bottom like the attached picture, the output polarity is reversed. It was a design flaw. They have corrected as far back as August, but �鶹�� seems to have old stock.

Images in this review

2 people found this helpful

Helpful

Paul B
Not what I expected
Reviewed in Canada on February 6, 2025
Verified Purchase
I was under the impression that I could run this through my AVR, but because there is only one RCA port I don’t see how I could hook up a speaker to it. Pretty disappointing.
With that said, I’m sure the amp is good and would perform well in a different scenario as I already have two Fosi ZA3 that perform great.

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One person found this helpful

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Top reviews from other countries

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Andy
Exceptional performance
Reviewed in Sweden on June 4, 2025
Verified Purchase

Amazing monoblocks. Pairing them with ZD3 preamp. Have had Mcintosh, Audiolab and NAD amps but the Fosis are the cleanest and most dynamic. Drives my JBL L100 Classic with excellent performance. Lots of power and unbelievable value. Gets a bit hot to the touch becase of its compact case but definitely not like a class A or tube amp.

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Jigsaw
Incroyable
Reviewed in France on March 30, 2025
Verified Purchase
Absolument bluffant, j'en ai acheté 2 pour alimenter mes deux triangle tetha qui étaient directement reliées à un amplificateur Cambridge CXA61. Les deux blocs sont reliés dorénavant à un ampli pré ampli casque Fiio K7. Le son est juste magnifique les basses sont rondes et les instruments parfaitement situés. À ce prix je ne vois aucun équivalent. Je vais passer une nouvelle commande pour mon autre paire d'enceintes.

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Alberto S
Fosi V3 mono
Reviewed in Italy on April 1, 2025
Verified Purchase
Ne ho presi due per avere gli alimentatori separati. Presi da una settimana e dopo una trentina d'ore si stanno ancora rodando, infatti il suono cambia di giorno in giorno.
Buona la qualità audio: bassi, scena, timbrica, nitidezza ecc. ecc. Valgono i circa 250 € spesi. Se devo trovare un difetto, forse "impastano" un pochino quando ci son troppi strumenti in contemporanea (comunque giudizio certamente positivo).
Come già segnalato scaldano parecchio e mi sto organizzando per mettere un paio di ventole.

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CRISTOBAL
Relación calidad-precio 10/10
Reviewed in Spain on October 13, 2024
Verified Purchase
Tengo un equipo de clase media-alta y compré dos V3 por las buenas reseñas que a nivel técnico tienen en todo el mundo. Las van pasando las horas de funcionamiento, van sonando mejor.
Utilizo de previo mi Streamer Wiim Pro-Plus y las cajas T+A Criterion TMR60 y la escena es tremenda, al estar los dos canales completamente separados, el sonido cálido y descriptivo, es un clase D con mayúsculas.

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Jan de Wit
Tiny block, lots of power.
Reviewed in the Netherlands on August 1, 2024
Verified Purchase
I am using these to test a setup with Dayton Audio BST-1 bass shakers. Currently I have one setup on the chair, and I am planning to use a second one in series at 8hm.

But for now this amp has plenty of power with default gain from minidsp processor. The bass-shaker response is powerful and direct.

I will try to update the review as soon as I have completed the setup.

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Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers, Mini Monoblock Class D Amp with TPA3255, 240W for HiFi Home Theater AVR Receiver Component, RCA/XLR Balanced Inputs with 48V/5A Power Supply

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From the brand

Stereo Mini Power Amplifier

50W-300W Amps for your choice!

DAC Amplifier for you!

Phono Preamp for You !

Preamp & headphone amp !

Product Description

The Next-Gen Monoblock

Fosi Audio V3 Mono Mini Power Amplifier

Engineered for Audiophiles - Optimal Choice for Home Audio Systems

Post-Filter Feedback Technology Integrated

Compact Yet Powerful

Accurate Imaging with Zero Crosstalk

Easily Replaceable DIP8 Dual Discrete Op-amps

Provides You with Flexible Connectivity Options

Advanced Cooling Design

With Minimalist Design

Automatic Signal Sensing

Premium Internal Components

NICHICON Caps, Japanese

WIMA Caps, German

ELNA Caps, Japan

Sumida Inductor, Japanese

Comparison

Similar Brands on �鶹��

Customer reviews

Review this product

Customers say

Select to learn more

Images in this review

Reviews with images

The hunt is over.

Top reviews from Canada

There was a problem filtering reviews. Please reload the page.

The hunt is over.

Images in this review

Possibility for old stock with defective reverse polarity output

Images in this review

Top reviews from other countries

5.0 out of 5 stars Exceptional performance

5.0 out of 5 stars Incroyable

5.0 out of 5 stars Fosi V3 mono

5.0 out of 5 stars Relación calidad-precio 10/10

5.0 out of 5 stars Tiny block, lots of power.

Exceptional performance

Incroyable

Fosi V3 mono

Relación calidad-precio 10/10

Tiny block, lots of power.