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Fosi Audio V3 amplifier discussion
- Thread starter gafortiby
- Start date
Hello friends
I have received the 2nd V3, and in two days I will start my holidays to do some bi-amplification tests.
One 48V and one 32V unit.
Every time I use the V3, I am more and more happy with its performance.
I have received the 2nd V3, and in two days I will start my holidays to do some bi-amplification tests.
One 48V and one 32V unit.
Every time I use the V3, I am more and more happy with its performance.
Attachments
Fosi V3 review
Hello audio lovers
I wanted to share with you one of those little diamonds that sometimes break into the market.
Fosi V3 a little gem that doesn't need much light to shine.
What is it about?
From a minimalist amplifier from the company Fosi, a brand that for a few years has been positioning itself as a reference in a market range that previously did not exist.
HI-FI has historically been inaccessible to the general public .
Fosi is offering products with a high level of quality at a very competitive price that allow you to enjoy quality sound at a reasonable cost
A great advantage of globalization and new communication channels is that the customer/brand relationship has changed radically.
In this case, the FOSI brand listens to its customers and takes their opinions into account in the product development phase.
Something unthinkable a few years ago and that changes the rules of the game, the client no longer buys what a brand has designed according to their ideas, the client is part of the project.
What does the FOSI V3 offer us?
In a very compact enclosure of 105x143x40 mm. hides a successful selection of components that in the sound test show their potential.
The minimalist design offers a front with an operating indicator LED and a volume adjustment dial with a very good touch plus a silent connection "there is no expected connection / pop noise".
There is no remote control and I think it is not necessary, if you use it as a desktop amplifier it is within your reach and if it is a distant installation, remember your old school times without this accessory.
The rear remains minimalist, RCA signal input connectors, speaker output with screw/banana connectors and a 3.5 mm output with fixed signal level independent of the front regulator.
Fosi in future reviews of the device indicates that it will be variable depending on the front regulator.
For this test I have two V 3 units, a 32V version and another 48V.
It is the same device where only the PSU varies, the PSU 48V is larger than the V3.
I have done the listening tests with HECO VICTA PRIME 302 speakers and a DAC S.M.S.L DO300.
Two configurations
Sound checks
Preparation and deployment of equipment for testing
Comparison between PSU
Bi-amplification mode tests
Wait a minute, where's the secret chamber? How is it possible to obtain this power with these micro dimensions?
These are the maximum powers declared, in the range of 20 to 20000 hz and with Thd < 1% are lower but enough to move any box on the market with quality.
The test speakers offer a sensitivity of 90 dB (2.8V/1M) and during tests with the 32 v and 48 v versions give a good result.
The potentiometer offers a logarithmic curve in its operation, that allows a better more precise adjustment when you use a lower volume, it may seem strange but it is a resource used in professional audio regularly.
The hated but necessary connection cables
So 32 V or 48 V? It all depends on the set and the power of use that you are going to use regularly.
You want quality sound at low volume, the 32V version is enough.
Is your installation demanding? Uses 48v
Music is clear and no background noise is present.
You can position the instruments in front of you and the timbre is totally neutral.
This sound will always depend on the speakers you use in your installation the V3 is only a neutral link in the sound chain , it does not color the signal.
In this sense, the V3, Fosi offers the possibility of replacing the NE5532 operational amplifiers as standard.
The V3 supports a variety of dual 8-pin op-amps such as Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4559, LM4562, LME49720HA
Among the different musical styles, from classical, pop, rock to techno, the V3 shows no fatigue or distortion.
The TPA3255 chip does an exceptional job, during the tests carried out and using techno music with a lot of bass the external temperature of the V3 did not exceed 40ºC with a starting temperature of 30ºC (Spain, August 2023, full heat wave).
Bi-amplification tests
In the bi-amplification tests I used the 32V version to power the treble and the 48V version for bass.
Changes?
An improvement in sound clarity is achieved , an improvement in details since there is greater dynamics to work with the speaker.
In future tests I will perform a signal filtering prior to V3 to assign a frequency range to each V3.
The usual version in the markets is the 32 V version (32V / 5A external power supply), although there is the version with 48 V / 5A source and the V3 only version without power supply, different options for different equipment, that added to the possibility of customizing the device positions it as a very useful component in the usual puzzles that are high-level sound equipment.
Conclusions
An essential component in main, secondary and desktop systems.
Pros
Build quality
Quality/price ratio
Power module performance
Possibility to customize operational amplifiers
Cons
Remote control? May be necessary in some cases
Pre-out output without regulation. We are in the same case as the remote control, a large majority of users do not use that function.
Specifications
Max Power Output: 300Wx2 @4Ω
SINAD: ≥88dB
SNR: ≥110dB
Terminating Impedance: 2-8Ω
THD: <0.003%
Power Amp: TI TPA3255
Op-Amp: TI NE5532 x2
Power Supply: 32V/5A, 48V/5A
Power Input Range: DC 24V-48V
Frequency Response Range:
20Hz-20kHz(±0.1dB)
Hello audio lovers
I wanted to share with you one of those little diamonds that sometimes break into the market.
Fosi V3 a little gem that doesn't need much light to shine.
What is it about?
From a minimalist amplifier from the company Fosi, a brand that for a few years has been positioning itself as a reference in a market range that previously did not exist.
HI-FI has historically been inaccessible to the general public .
Fosi is offering products with a high level of quality at a very competitive price that allow you to enjoy quality sound at a reasonable cost
A great advantage of globalization and new communication channels is that the customer/brand relationship has changed radically.
In this case, the FOSI brand listens to its customers and takes their opinions into account in the product development phase.
Something unthinkable a few years ago and that changes the rules of the game, the client no longer buys what a brand has designed according to their ideas, the client is part of the project.
What does the FOSI V3 offer us?
In a very compact enclosure of 105x143x40 mm. hides a successful selection of components that in the sound test show their potential.
The minimalist design offers a front with an operating indicator LED and a volume adjustment dial with a very good touch plus a silent connection "there is no expected connection / pop noise".
There is no remote control and I think it is not necessary, if you use it as a desktop amplifier it is within your reach and if it is a distant installation, remember your old school times without this accessory.
The rear remains minimalist, RCA signal input connectors, speaker output with screw/banana connectors and a 3.5 mm output with fixed signal level independent of the front regulator.
Fosi in future reviews of the device indicates that it will be variable depending on the front regulator.
For this test I have two V 3 units, a 32V version and another 48V.
It is the same device where only the PSU varies, the PSU 48V is larger than the V3.
I have done the listening tests with HECO VICTA PRIME 302 speakers and a DAC S.M.S.L DO300.
Two configurations
- One V3 unit in normal connection mode
- Bi-wired mode with two V3 units (32V-48V)
Sound checks
Preparation and deployment of equipment for testing
Comparison between PSU
Bi-amplification mode tests
Wait a minute, where's the secret chamber? How is it possible to obtain this power with these micro dimensions?
These are the maximum powers declared, in the range of 20 to 20000 hz and with Thd < 1% are lower but enough to move any box on the market with quality.
The test speakers offer a sensitivity of 90 dB (2.8V/1M) and during tests with the 32 v and 48 v versions give a good result.
The potentiometer offers a logarithmic curve in its operation, that allows a better more precise adjustment when you use a lower volume, it may seem strange but it is a resource used in professional audio regularly.
The hated but necessary connection cables
So 32 V or 48 V? It all depends on the set and the power of use that you are going to use regularly.
You want quality sound at low volume, the 32V version is enough.
Is your installation demanding? Uses 48v
Music is clear and no background noise is present.
You can position the instruments in front of you and the timbre is totally neutral.
This sound will always depend on the speakers you use in your installation the V3 is only a neutral link in the sound chain , it does not color the signal.
In this sense, the V3, Fosi offers the possibility of replacing the NE5532 operational amplifiers as standard.
The V3 supports a variety of dual 8-pin op-amps such as Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4559, LM4562, LME49720HA
Among the different musical styles, from classical, pop, rock to techno, the V3 shows no fatigue or distortion.
The TPA3255 chip does an exceptional job, during the tests carried out and using techno music with a lot of bass the external temperature of the V3 did not exceed 40ºC with a starting temperature of 30ºC (Spain, August 2023, full heat wave).
Bi-amplification tests
In the bi-amplification tests I used the 32V version to power the treble and the 48V version for bass.
Changes?
An improvement in sound clarity is achieved , an improvement in details since there is greater dynamics to work with the speaker.
In future tests I will perform a signal filtering prior to V3 to assign a frequency range to each V3.
The usual version in the markets is the 32 V version (32V / 5A external power supply), although there is the version with 48 V / 5A source and the V3 only version without power supply, different options for different equipment, that added to the possibility of customizing the device positions it as a very useful component in the usual puzzles that are high-level sound equipment.
Conclusions
An essential component in main, secondary and desktop systems.
Pros
Build quality
Quality/price ratio
Power module performance
Possibility to customize operational amplifiers
Cons
Remote control? May be necessary in some cases
Pre-out output without regulation. We are in the same case as the remote control, a large majority of users do not use that function.
Specifications
Max Power Output: 300Wx2 @4Ω
SINAD: ≥88dB
SNR: ≥110dB
Terminating Impedance: 2-8Ω
THD: <0.003%
Power Amp: TI TPA3255
Op-Amp: TI NE5532 x2
Power Supply: 32V/5A, 48V/5A
Power Input Range: DC 24V-48V
Frequency Response Range:
20Hz-20kHz(±0.1dB)
Gaden Phoenix
Member
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- Jul 5, 2023
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Would like to ask, any easy way to high pass filter this to use with a subwoofer? That will not break the bank like the minidsp?
I bought a V3 with the 48V PSU from ali express, very disappointed with it. The audio levels are so low, its crazily quiet. I'm comparing it against the Aiyima A07pro, and a musical fidelity amp, and the V3 is very very quiet.
I wanted to use it as a desktop amp, but my old Logitech 2 speaker setup is a lot louder
I wanted to use it as a desktop amp, but my old Logitech 2 speaker setup is a lot louder
Zek
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This is apparently because of the logarithmic potentiometer, you have to turn it up a bit more to get the appropriate volume.
Zek
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The physical position of the potentiometer does not indicate how strong the amplifier is because the implementation of the input part is not the same for all amplifiers.
With the 32v supply, I mostly play with the volume at 12 o'clock and beyond. 12 o'clock is quieter room volume. To get loud, yes, to 3 o'clock and beyond.
It's probably much different with the 48 v supply.
It is true that with the same 32v brick, the Aiyima A07 can play much louder.
Zek
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Last edited:
I found the same with my V3 vs the A07. I sent my V3 back to Amazon. To each their own. I may give the V3 another try at some point down the road.
so essentially you don't care about the power of an amplifier, you only care that with the potentiometer at 9 the volume will rock your ears.
D
Deleted member 48726
Guest
Aggressive. But it does look like he completely ignored the posts reg. different potentiometers.
Slightly. Maybe my post was misunderstood. I get the potentiometer position, I really don't care whether it says 3 or 9.
What I care about is that the amp doesn't really drive the speakers, the output is a lot quieter than I expected.
I just wondered whether others had the same issue, or maybe I've got a faulty unit.
What I care about is that the amp doesn't really drive the speakers, the output is a lot quieter than I expected.
I just wondered whether others had the same issue, or maybe I've got a faulty unit.
D
Deleted member 48726
Guest
The Scientific Audiophile (@SimpleTheater) published his review of it and it appears to struggle quite a bit power wise. Also notice the difference in LCpeak compared to an A/B amp (16 min. in)
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this guy is trying for the 'internet drama views'
he's had a go at Amir, Randy, Darko, Andrew Robinson... anyone who he disagrees with and i guess that why he gets these views and these subs
i think i gave up when he derided Andrew Robinson for being all about 'charts and graphs and measurements'... excuse me? is this the #recoveringaudiophile? the guy who likes ikea doorstops?
he's had a go at Amir, Randy, Darko, Andrew Robinson... anyone who he disagrees with and i guess that why he gets these views and these subs
i think i gave up when he derided Andrew Robinson for being all about 'charts and graphs and measurements'... excuse me? is this the #recoveringaudiophile? the guy who likes ikea doorstops?
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