Fosi Audio V3 Mono Amplifier Review

[Talisman]

@Fosi Audio Could you give us some more information regarding the power supply that would be on the 6.3 Ampere bench?

 

[Kimbrough Xu]

Also, just two inputs doesn't cut it (for me).

Why do you need so many inputs? I think Fosi Audio V3 MONO is a power amplifier which is used with a preamplifier.

 

[Negatywny]

ABX Audiophiles. Not my cup of tea.

yeah, i thought, uuu an abx audiophile, looks like some objective testing will be played, but NO, just old superstition gibberish

On the other hand almost all reviews of fosi v3 monos are casually done, like they got 10$ to do it and call it a day. Imagined this reviewers would be more meticulate with such interesting product, but looks like they don't really care.

The model number where it says "48063" denotes it as a 48v 6.3A power supply. I would be surprised if it could reach 7 amp for more than a few milliseconds.

expectable, so i took two power supplies, more is always better

Also we made it to the final goal:

 

[SMen]

Yes, they are nowhere NEAR 10A power supplies. Big D just repeats what the Fosi supplied ones say.

The model number where it says "48063" denotes it as a 48v 6.3A power supply. I would be surprised if it could reach 7 amp for more than a few milliseconds.

Still, the tests don't fall too too short with the 48v '10A'

In Williston Audio test he gets
116 and 111 watts into 8ohm at 1%
224 and 217 watts into 4ohm at 1%

while the Fosi kickstarter claims 120 and 240 watts respectively with a single 48v/5A
So a bit short. I wonder what the 'theoretical' power tests would be with a shared 48v 6.3A supply : would they be this close?

I'm not so keen on the 10A max claim on the power supply though, without this being explained, and this might explain Big D thinking it's limited in some way.

 

[Psinet]

Still, the tests don't fall too too short with the 48v '10A'

In Williston Audio test he gets
116 and 111 watts into 8ohm at 1%
224 and 217 watts into 4ohm at 1%

while the Fosi kickstarter claims 120 and 240 watts respectively with a single 48v/5A
So a bit short. I wonder what the 'theoretical' power tests would be with a shared 48v 6.3A supply : would they be this close?

I'm not so keen on the 10A max claim on the power supply though, without this being explained, and this might explain Big D thinking it's limited in some way.

Might be best to get a "10" amp for each mono for loud, low ohm usage.

 

[amix]

Why do you need so many inputs?

Because not everybody has been born after the 1990's and may have devices, they use? For me, that would be my Nakamichi tape deck, my Rotel phono player, my SACD player, which I may or may not want to connect to the external DAC, the external DAC. And who knows what the future holds?

A proper preamplifier is the controller to your system. Source, tone and volume.

 

[gwing]

Why do you need so many inputs? I think Fosi Audio V3 MONO is a power amplifier which is used with a preamplifier.

Because I have more than two devices. However we are talking about the number of connections available to a pre-amp or input swicher before the monoblocks, I agree the monoblocks themselves only need, in principle, one input although having both RCA and balanced is appreciated.

 

[amix]

Williston Audio Labs just uploaded a video of him dyno testing them

All the negatives he lists, besides the high input voltage, are no negatives for me (I ordered two of the 10A PSUs).
And the enthusiasm in his voice makes me believe I've done a very good deal.

 

[Alex_Brouwer]

well that was quick they are gonna update the stretch goals don't know how yet.

 

[Kimbrough Xu]

Because not everybody has been born after the 1990's and may have devices, they use? For me, that would be my Nakamichi tape deck, my Rotel phono player, my SACD player, which I may or may not want to connect to the external DAC, the external DAC. And who knows what the future holds?

A proper preamplifier is the controller to your system. Source, tone and volume.

Where are your devices placed?

In your living room? Beside your TV?

 

[sl1982]

In addons there is now a GaN 10A power supply you can add. Any information on this power supply?

 

[Kimbrough Xu]

View attachment 366617well that was quick they are gonna update the stretch goals don't know how yet.

I wonder what is the prize for the stretch goal.

 

[drmevo]

Yes, they are nowhere NEAR 10A power supplies. Big D just repeats what the Fosi supplied ones say.

The model number where it says "48063" denotes it as a 48v 6.3A power supply. I would be surprised if it could reach 7 amp for more than a few milliseconds.

This is disappointing if true, but I'm going to wait for Fosi's response before trying to change my KS reward. I don't plan on placing the monoblocks right next to my speakers so I was fine with a splitter if the single PSU had identical performance, but if it doesn't, I'll definitely want the two 5A power supplies. I don't really want to shell out another $100 for a second 10A power supply.

It seems strange that no one else has come across this discrepancy yet - seems like it would be an important part of the measurements?

 

[SMen]

This is disappointing if true, but I'm going to wait for Fosi's response before trying to change my KS reward. I don't plan on placing the monoblocks right next to my speakers so I was fine with a splitter if the single PSU had identical performance, but if it doesn't, I'll definitely want the two 5A power supplies. I don't really want to shell out another $100 for a second 10A power supply.

It seems strange that no one else has come across this discrepancy yet - seems like it would be an important part of the measurements?

The Fosi power supplies do seem expensive compared to Aiyima's GaNs, but equally if the innards are closer to 10A than 6.3A we ought to know if the Fosi model is modified or more highly specified in some way than the ones @Psinet referred to. I don't have 2 ohm speakers that is for sure! But it's the principle.

It's probably a pain, but if these power supplies are going be supplied as separate products it would indeed be useful to know / verify the measurements I agree.

 

[Roger285]

This is disappointing if true, but I'm going to wait for Fosi's response before trying to change my KS reward. I don't plan on placing the monoblocks right next to my speakers so I was fine with a splitter if the single PSU had identical performance, but if it doesn't, I'll definitely want the two 5A power supplies. I don't really want to shell out another $100 for a second 10A power supply.

It seems strange that no one else has come across this discrepancy yet - seems like it would be an important part of the measurements?

FYI, you may already have seen this, but Fosi has this to say regarding the amps performance with the different power supplies:

Based on our measurement, using a 48V/10A power supply does not significantly increase power output compared to a 48V/5A power supply. Other parameters, such as signal-to-noise ratio, THD, and frequency response, are also virtually identical. Therefore, there is no noticeable difference between the two options in terms of your user experience. We are offering this one-to-two power configuration option for more flexible system building. Of course, by using one less power supply unit, you can save space and achieve a neater system setup.

 

[SMen]

FYI, you may already have seen this, but Fosi has this to say regarding the amps performance with the different power supplies:

Based on our measurement, using a 48V/10A power supply does not significantly increase power output compared to a 48V/5A power supply. Other parameters, such as signal-to-noise ratio, THD, and frequency response, are also virtually identical. Therefore, there is no noticeable difference between the two options in terms of your user experience. We are offering this one-to-two power configuration option for more flexible system building. Of course, by using one less power supply unit, you can save space and achieve a neater system setup.

This is the point really - it has the same brand and serial number of a 48v6.3A model so clarification needed surely? And this general issue or question has cropped up a few times in different threads, including this one https://www.audiosciencereview.com/forum/index.php?threads/aiyima-a70-stereo-amplifier-review.52830/

https://www.audiosciencereview.com/...o-v3-mono-amplifier-review.53474/post-1963060 this review does strike me as being closer to 10A though - but someone with better knowledge than me might chip in at what their measurements ought to suggest. The tester was puzzled though and referred to some kind of 'limiting' at play possibly.

Interesting to watch the testing.

 

[drmevo]

The Fosi power supplies do seem expensive compared to Aiyima's GaNs, but equally if the innards are closer to 10A than 6.3A we ought to know if the Fosi model is modified or more highly specified in some way than the ones @Psinet referred to. I don't have 2 ohm speakers that is for sure! But it's the principle.

It's probably a pain, but if these power supplies are going be supplied as separate products it would indeed be useful to know / verify the measurements I agree.

I might've misinterpreted the review but he seemed to imply that it wasn't hitting its power rating for 8 or 4 Ohm either. That would be my real concern.

 

[antcollinet]

Not a bad review

based only on subjective opinions.

Oxymoron

 

[SMen]

I might've misinterpreted the review but he seemed to imply that it wasn't hitting its power rating for 8 or 4 Ohm either. That would be my real concern.

They so often do. The question for me really is why? They are not too far short but I really weighed up which power supply option to get. If we had a verified power and ripple figure for power supplies I think it would be interesting. But there is a big difference between 48v6.3 amps and 48v10 amps. If I am not mistaken it is 302watts vs 480 watts.

 

[rvsixer]

I wonder what is the prize for the stretch goal.

Listed under Campaign->Stretch Goals on the Kickstarter page.