Fosi Audio V3 Mono Amplifier Review

[RandomEar]

We do lack some essential emojis on ASR. We would specifically need little trolls and golden ears and maybe a speaker and a room. @amirm this is an important feature request!

(We also lack the emoji to convey the ironic sentiment in this message)

 

[Roland68]

We do lack some essential emojis on ASR. We would specifically need little trolls and golden ears and maybe a speaker and a room. @amirm this is an important feature request!

(We also lack the emoji to convey the ironic sentiment in this message)

It would be particularly important to have emojis that clearly indicate whether a statement is sarcastic or absolutely serious.

 

[somebodyelse]

A GAN power supply naturally makes the sound much faster; the sound becomes more enveloping, and the veils that otherwise shrouded the music are lifted. If you then replace the appropriate operational amplifiers as well, you’ll be a whole lot closer to audiophile nirvana.

I've got a bridge that'll get you even closer to audiophile nirvana...

More seriously, do you have a plausible mechanism for how GAN transistors in a switching PSU would alter the sound of an amp, or any measurements to demonstrate such a change? It's well into "that which can be proposed without evidence can be dismissed without evidence" territory.

 

[antcollinet]

I've got a bridge that'll get you even closer to audiophile nirvana...

More seriously, do you have a plausible mechanism for how GAN transistors in a switching PSU would alter the sound of an amp, or any measurements to demonstrate such a change? It's well into "that which can be proposed without evidence can be dismissed without evidence" territory.

Pretty certain he was being ironic.

 

[somebodyelse]

Pretty certain he was being ironic.

Poe's law in action

 

[Audionaut]

More seriously, do you have a plausible mechanism for how GAN transistors in a switching PSU would alter the sound of an amp, or any measurements to demonstrate such a change?

As is well known, GaN transistors consist of gallium atoms that oscillate at exceptionally high speeds; due to their inherent cosmic restlessness, they generate a significantly finer “energy field” than conventional silicon. This field couples directly into the amplifier’s musical aura—preferably at 192 kHz, but also (naturally not so detailed) with Spotify.

The electrons no longer simply move through the conductor, but dance rhythmically to the beat of the music, which measurably improves the groove (though only with the inner ear).
The higher switching speed creates a microdynamic unfolding in the quantum realm, which ensures “more air between the molecules,” particularly with the triangle and cymbals.
At the same time, GaN reduces so-called silicon memory noise, an effect in which old signals become emotionally embedded in the material and tinge the playback with a melancholic tone.

GaN power supplies thus deliver “better-humored” power, and as everyone knows, an amplifier powered by “better-humored” power simply sounds more open, warmer, and with significantly better soundstage imaging.
You don’t need to measure that—even your wife will hear it right away.

 

[Roland68]

As is well known, GaN transistors consist of gallium atoms that oscillate at exceptionally high speeds; due to their inherent cosmic restlessness, they generate a significantly finer “energy field” than conventional silicon. This field couples directly into the amplifier’s musical aura—preferably at 192 kHz, but also (naturally not so detailed) with Spotify.

The electrons no longer simply move through the conductor, but dance rhythmically to the beat of the music, which measurably improves the groove (though only with the inner ear).
The higher switching speed creates a microdynamic unfolding in the quantum realm, which ensures “more air between the molecules,” particularly with the triangle and cymbals.
At the same time, GaN reduces so-called silicon memory noise, an effect in which old signals become emotionally embedded in the material and tinge the playback with a melancholic tone.

GaN power supplies thus deliver “better-humored” power, and as everyone knows, an amplifier powered by “better-humored” power simply sounds more open, warmer, and with significantly better soundstage imaging.
You don’t need to measure that—even your wife will hear it right away.

April 1st is very long this time.....

 

[antcollinet]

You don’t need to measure that—even your wife will hear it right away.

As will any family member - especially when influenced by the wibbly wobbly, timey wimey discomquantummy field that always becomes established in the emotionally warmest room of the house.

 

[frogmeat69]

Will "better-humored" power be most helpful with the classic live comedy vinyls of the past? Will it help me get the joke easier?? I just wanna laff moar.

 

[Georgios]

Sooooooo, what’s a good upgrade option with similar sound quality to the Fosi V3 but with much more power output?

 

[JRowland]

Sooooooo, what’s a good upgrade option with similar sound quality to the Fosi V3 but with much more power output?

https://purifi-audio.com/eigentakt

 

[Lednek]

Sooooooo, what’s a good upgrade option with similar sound quality to the Fosi V3 but with much more power output?

I have the Hypex NcX500 amps. They are several steps up in quality from the V3 monos three times as good and 5 times the price( or something like that). A solid deal in the world of diminishing returns. The purifi amps are awesome as well

 

[antcollinet]

Sooooooo, what’s a good upgrade option with similar sound quality to the Fosi V3 but with much more power output?

V3 Monos. 3eAudio A7, are both at the upper limits of what you can do with TPA3255 single chip implementations.

After that you are into the hypex and purify options.

But - ask yourself if you really need more power, and what you are expecting to get from it. Bear in mind doubling the power only gets you 3dB higher SPL, OR 3dB greater headroom. You need something like 10x the power to get double the perceived volume.

 

[psemeraro]

Thank Amir so much for the measurement! The V3 Mono is another amplifier co-created with members, following the V3 stereo amp. We would particularly like to thank @Toku, @ModDIY , @mike70 , @cyclo, and all the other members who have provided us with invaluable suggestions.

The V3 Mono is our first amp with PFFB implementation. During the period we sent the set to Amir for testing, our R&D team did not stop optimizing the V3 Mono, and we have now further improved its frequency response curve. Below is the chart for your reference.
View attachment 360736


The V3 Mono is currently in production, and it will be launched on Kickstarter on the 20th of this month. There will be very attractive discounts available then, and we hope you'll stay tuned!

Hi Fosi Audio! I'm considering the V3 mono's. Is the input to the first buffer ac coupled? (In addition to the output after the buffer ac coupled to the 3255?)
Thanks, Pat

 

[TwistofLime]

Long-time reader. First time posting, and I've only made it to page 73 of this thread.
I'm not gonna tell you what the Fosi V3 Mono is or isn't, but $260 for a pair of these cuties is a steal.

 

[girtab]

My v3 Monos came in (after returning a broken one). They sound ok but when putting my ear at the tweeter I hear hiss. Is that normal

 

[staticV3]

My v3 Monos came in (after returning a broken one). They sound ok but when putting my ear at the tweeter I hear hiss. Is that normal

Every Amp that exists has an electrical noise floor, the amplitude of which depends on the Amp's design.

Whether you can hear this noise floor as hiss coming from your drivers, depends on:

-crossover configuration
-driver sensitivity
-distance between ear and driver
-listening environment noise floor
-how healthy your hearing is

 

[girtab]

Every Amp that exists has an electrical noise floor, the amplitude of which depends on the Amp' design.

Whether you can hear this noise floor as hiss coming from your drivers, depends on:

-crossover configuration
-driver sensitivity
-distance between ear and driver
-listening environment noise floor
-how healthy your hearing is

So would topping LA90's also have this slight hiss when putting my ear at the tweeter? Because its supposedly the cleanest signal amp on asr right? Or do all power amps have some sort of audible hiss to some extent

 

[Audionaut]

My v3 Monos came in (after returning a broken one). They sound ok but when putting my ear at the tweeter I hear hiss. Is that normal

No, that's actually not normal.
Important: Are the Fosis connected to a preamp, or did you just plug them in to test them without connecting them to any other devices?

 

[girtab]

No, that's actually not normal.
Important: Are the Fosis connected to a preamp, or did you just plug them in to test them without connecting them to any other devices?

tested both. once with no preamp and once with. granted its a pretty noisy preamp a behringer umc22 but the hiss remains roughly the same. I plan on getting a minidsp flex balanced to see if that gets better but i doubt it. It also hard for me to believe that they're broken because one of them came broken (had extremely loud static noise when powered on) so i had to replace it. Am also using the regular 5A dual PSUs instead of the 10A + splitter cable so it cant be that either