Fosi Audio V3 Mono Amplifier Review

[DavidM1]

Take a Big Mac and then put something else in it—BBQ sauce, fried onions, ranch dressing, banana peppers, whatever…it’s no longer a, “perfect Big Mac,” it’s your own twist.

Take a clear window and then put a rose coloured tint on it. All you have is a rose coloured window and no longer any real sense of the colours on the other side.

if one isn’t interested in high fidelity why not just listen to a clock radio?

 

[EddNog]

Take a clear window and then put a rose coloured tint on it. All you have is a rose coloured window and no longer any real sense of the colours on the other side.

if one isn’t interested in high fidelity why not just listen to a clock radio?

This why this is called a subjective matter, because it’s obviously not objective at all.

-Ed

 

[somebodyelse]

Op-amp rolling is the new tube rolling. You’re looking for your preferred flavor of distortion coloring, not a perfect signal.

Take a Big Mac and then put something else in it—BBQ sauce, fried onions, ranch dressing, banana peppers, whatever…it’s no longer a, “perfect Big Mac,” it’s your own twist.

ASR crowd doesn’t understand anything other than the perfect Big Mac, but these people want it their way; they’re the Burger King types.

-Ed

That's not what op-amp rolling usually does though - usually there is little to no real difference. Sometimes it causes oscillation which is just bad, and risks damage. People will think they hear a difference due to well known psychological effects that controlled listening tests are designed to avoid.

For your analogy the op-amp rolling is like having a load of identical sauces with different labels, plus a few that have gone bad and might give you food poisoning. Here we suggest that if you want to change the flavour you should start with a known good recipe and make known changes to the ingredients - use a plugin like PKharmonic to create your preferred distortion profile.

 

[burkm]

It is getting out of hand because "evidence" about any negative or positive effects are hard to get at, if there exists any. The problem seems to be, that usually no one can provide "real" measurements one way or the other about the "goods" of each position. The question comes up then, why the manufacturer didn't choose the "best sounding" op amps already (objective and subjective) for the job to be done if not for cost reason...

I ordered some on 7th September and they sent them out start of this week - just gone through customs today I think. So Fosi do have stock it seems!

They might have restocked already... (News are always "old" because of existing time delay...)

 

[Mort]

If selling useless op-amps to goldeneared consumers helps them achieve a lower price point on this otherwise audibly perfect device, I'm all for it.

 

[ninetylol]

OP amp jugglers really are the new clowns of audio

 

[burkm]

I don't think, if they achived a lower price point because of this, They probably don't know, how much of those they are selling and economic wisdsom usually dictates, that Your selling price should be independent of other sales, if You don't know otherwise. To my understanding it is additional income...

 

[SaltyCDogg]

Interesting that they're now selling this with some cooling fans.

https://a.aliexpress.com/_EuVQSXj

 

[burkm]

I believe they try to circumvent any "turbulences" among (potential) users due to those "rumors" of high temperatures generated by the V3 monos during use.
They are beeing sold (sometimes) on several marketplaces for similar ones at almost 1/2 the Fosi Audio price, but their size is somewhat special: 125 mm.
A 120 mm fan with USB connection should be fine too...
Note: No info about the additional noise generated and amperage needed by those fans.... An external USB power supply must be used.

 

[DavidM1]

I believe they try to circumvent any "turbulences" among (potential) users due to those "rumors" of high temperatures generated by the V3 monos during use.
They are beeing sold (sometimes) on several marketplaces for similar ones at almost 1/2 the Fosi Audio price, but their size is somewhat special: 125 mm.
A 120 mm fan with USB connection should be fine too...
Note: No info about the additional noise generated and amperage needed by those fans.... An external USB power supply must be used.

This is very funny. You can't blame some Ali Express retailer for supplying a market of panicky audiophiles.

 

[jboyer]

Should I store icepacks?
As a programmer I pay attention to the temperature of my workstation. My multi fan box barely starts these. But if you read the PC literature, modern CPU'S and video cards need tons of fresh air.
For some reasons, it seems that Class D amps generate the same panicking as the Intel 14th gen CPUs.
Before it becomes a problem, it will create death ears.
There is always a customer for a extra fan.

 

[Lux_ury]

I defend the right for people to go through the OP amps, it's a process and it's my right to highlight it's the way your perspective is always gonna be subjective. TBf I'm popping in and surprised OP amps are still a thing?
My understanding is there would be no professional ladies of the night, if there wasn't a demand for the ladies too soon?
My amps have completely cooled nicely with time used on the amps hardly no heat, but ambient has dropped. (Passive cooling is cheap and free)
Fosi still have no production date on the new DC filter My guess it will have two jacks at one end to split the issues.

 

[Freezak]

Should I store icepacks?
As a programmer I pay attention to the temperature of my workstation. My multi fan box barely starts these. But if you read the PC literature, modern CPU'S and video cards need tons of fresh air.
For some reasons, it seems that Class D amps generate the same panicking as the Intel 14th gen CPUs.
Before it becomes a problem, it will create death ears.
There is always a customer for a extra fan.

Intel 13th and 14th gen is defective in its "core", here the potential problem with the V3 Mono is most likely just the heat.

 

[burkm]

This is very funny. You can't blame some Ali Express retailer for supplying a market of panicky audiophiles.

This is not an "Ali Exspress retailer thing", but comes from the manufacturer Fosi Audio itself.
Naturally it is a "new" offering, because the article has not been offered before.
You have to look through their offerings especially "Accessories" (?) to find it...
Fosi Audio is just supplying what their (potential) customers might eventually want
It's the same thing as those different (expensive) OP amps suggested, because the original ones are made replacable ...

 

[amix]

Any numbers for inner resistance? Does someone know the damping factor?

 

[Sokel]

Any numbers for inner resistance? Does someone know the damping factor?

Typically 30-40x for the TPA3255 chip.
It's fine.

 

[burkm]

Is their any value (range) listed in their complex data sheet ?

 

[Sokel]

Is their any value (range) listed in their complex data sheet ?

Here's a real measurement by Archimago,seems like fosi did it better than average:

More than enough,nice and smooth till 10kHz or so.
Is not a DF champion though.

 

[burkm]

For pure "8 Ohm speakers" or resistors it doubles it damping factor value to almost 300 (267 to be exact) ?

 

[ninetylol]

Anyone paired these with the Lintons? I jumped on the wagon now and ordered a pair replacing a Wiim Amp, which is great for it, but with the Lintons i dont actually need a sub anymore so i wanted to give them some new amplifier toys to play with