• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Fosi Audio V3 Mono Amplifier Review

Rate this amplifier:

  • 1. Poor (headless panther)

    Votes: 13 1.9%
  • 2. Not terrible (postman panther)

    Votes: 22 3.2%
  • 3. Fine (happy panther)

    Votes: 135 19.7%
  • 4. Great (golfing panther)

    Votes: 514 75.1%

  • Total voters
    684
Listed under Campaign->Stretch Goals on the Kickstarter page.
We’re wondering what the revised stretch goal rewards will be as they have said they are planning to improve on what’s listed because a single MUSES op-amp isn’t very useful when you’re buying two amps.

-Ed
 
Listed under Campaign->Stretch Goals on the Kickstarter page.
In the email I received today these might be changing.
We’re wondering what the revised stretch goal rewards will be as they have said they are planning to improve on what’s listed because a single MUSES op-amp isn’t very useful when you’re buying two amps.

-Ed
nor a single xlr cable! Mind you there is a difference, as you would need 4 op amps not 2! ... language issue here in the marketing methinks
 
In the email I received today these might be changing.

nor a single xlr cable!
For some odd reason I thought it was implied to be one pair of cables but you make a good point if it was indeed just a single one.

-Ed
 
For some odd reason I thought it was implied to be one pair of cables but you make a good point if it was indeed just a single one.

-Ed
I know confusing! I actually just edited my reply to reinforce your point!

We shall see.
 
I know confusing! I actually just edited my reply to reinforce your point!

We shall see.
Yeah…although the op-amp thing is arguable because they said that theoretically you could just do one of the two gain stage pieces (per amp) and it would still work, just less of an effect. Either way I can think of better things for them to give us. The XLR cables, even a pair, does nothing for the backers who don’t run a balanced chain (I do, so not my problem, but then I already have plenty of spare XLR cables on hand as-is).

-Ed

PS Admins pls don’t thread ban me, I’m just trying to talk about stretch crowdfunding goals, not the subject matter whose name shall not be mentioned.
 
Yeah…although the op-amp thing is arguable because they said that theoretically you could just do one of the two gain stage pieces (per amp) and it would still work, just less of an effect. Either way I can think of better things for them to give us. The XLR cables, even a pair, does nothing for the backers who don’t run a balanced chain (I do, so not my problem, but then I already have plenty of spare XLR cables on hand as-is).

-Ed

PS Admins pls don’t thread ban me, I’m just trying to talk about stretch crowdfunding goals, not the subject matter whose name shall not be mentioned.
Ditto.

Regarding the cables people can choose RCA.

There are a few things for Fosi to 'tidy up' for clarification in terms of marketing, and indeed some technical aspects. They do seem to get there though, so I'm looking forward to these revisions and updated info.
 
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.
Could this be an RCA vs. balanced connection issue? I'm clueless on this stuff but that seems to be the difference in the way Amir tested vs. the Williston Audio video.

I don't want to make a mountain out of a molehill, it could be there is a simple explanation and everything is fine. I'm trusting Fosi when they say the 10A is essentially the same as two 5A, or at least that they'll make it right if it's not currently.
 

Oxymoron? Not really. Except if you take things extremely literaly. You nitpicked quotes from my post out of context. My qualifier 'not a bad review (if you can call it that)' was not meant about the quality of the review itself, but about the quality of the Fosi amp (based on the reviewers subjective opinion). I thought that was pretty clear from my whole post ;). I don't see an oxymoron there.
 
Last edited:
Could this be an RCA vs. balanced connection issue? I'm clueless on this stuff but that seems to be the difference in the way Amir tested vs. the Williston Audio video.

I don't want to make a mountain out of a molehill, it could be there is a simple explanation and everything is fine. I'm trusting Fosi when they say the 10A is essentially the same as two 5A, or at least that they'll make it right if it's not currently.
It is not RCA vs. balanced I extremely doubt, but it should not be about trust! On all places but here on ASR!

A simple explanation is probably due here :)
 
Oxymoron? Not really. Except if you take things extremely literaly. You nitpicked quotes from my post out of context. My qualifier 'not a bad review (if you can call it that)' was not meant about the quality of the review itself, but about the quality of the Fosi amp (based on the reviewers subjective opinion). I thought that was pretty clear from my whole post ;). I don't see an oxymoron there.
I know - I was just having fun (as I'd hoped the emoticon would indicate ;))
 
We’re wondering what the revised stretch goal rewards will be as they have said they are planning to improve on what’s listed because a single MUSES op-amp isn’t very useful when you’re buying two amps.

-Ed
Listed under Campaign->Stretch Goals on the Kickstarter page.
In the email I received today these might be changing

Well personally I think that the kickstarter page will be one of the first places they list the revised rewards, and also that they won't change the rewards posting location (or keep a revision history on them). Its still where I will be looking out for them.
 
When Big D (Williston) did the max power dyno run at 1% distortion at 4 ohms on 2x mono amps using a y-splitter on the "10A" power supply, both amps engaged a safety power off. When he used a single amp on the "10A" at 4 ohms 1% distortion, it did not do a safety power off.
 
Thinking about these since my Sabaj A30a purchase didn't pan out, I don't really need that many watts ( very efficient DIY 3-way speakers) but the PFFB and the pricing is tempting me. Would I need a RCA-splitter to connect the 2 monoblocks to my SMSL SU-6 DAC?
 
Thinking about these since my Sabaj A30a purchase didn't pan out, I don't really need that many watts ( very efficient DIY 3-way speakers) but the PFFB and the pricing is tempting me. Would I need a RCA-splitter to connect the 2 monoblocks to my SMSL SU-6 DAC?
Of course not, they are monoblocks, each one has only one channel, therefore only one RCA cable
 
Of course not, they are monoblocks, each one has only one channel, therefore only one RCA cable
You are correct, now that I thought about it properly I can just connect the monoblocks to the R-L RCA channels of the DAC, should not ask such stupid questions in the morning. Order placed for 2xMono V3 with 2x 48/5V PSU.
 
Last edited:
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.
$20 bet: One of these amps on a single 48v 5A power supply provided by FOSI, will score a higher power rating at >1% distortion and 2 Ohms on a dyno, than it does when two are connected to the 48v "10A(Max)" power supply provided by FOSI (also, it will have a lower noise floor).
 
$20 bet: One of these amps on a single 48v 5A power supply provided by FOSI, will score a higher power rating at >1% distortion and 2 Ohms on a dyno, than it does when two are connected to the 48v "10A(Max)" power supply provided by FOSI (also, it will have a lower noise floor).
No doubt if the 10A one is 6.3A after all as suspected by some previous posts.
 
Back
Top Bottom