Fosi Audio V3 Mono Amplifier Review

[saberger0357]

Definitely as of last week

And is opening the up the only way to know for sure if they're reversed or not?

 

[DCinATX]

a couple other options:

1. Count the QA stickers on the back. In theory, one sticker = reversed polarity; two stickers = problem fixed at the factory.

2. Use a subwoofer “polarity” setting (if you have one) to listen for wave cancellation. It’s pretty noticeable.

 

[JLB321GO]

And is opening the up the only way to know for sure if they're reversed or not?

You can also use a test track, and hear the results.

 

[galego100]

Everybody talk about good customer experience of @Fosi Audio , mine is one of the worst i had. After almost 3 months , i have no monos( stuck in Spanish customs) , money is gone, i was a pledger, and @Fosi Audio doesn´t provide a solution. What a scam.

 

[ninetylol]

Everybody talk about good customer experience of @Fosi Audio , mine is one of the worst i had. After almost 3 months , i have no monos( stuck in Spanish customs) , money is gone, i was a pledger, and @Fosi Audio doesn´t provide a solution. What a scam.

I just posted in another thread, I have terrible experience with @Fosi Audio support too. I can only advise anyone not ordering from them directly, support wont help, dont honor their own return policies and act against european laws. Besides my support guy is insulting my will to return item. I think i never had such a terrible experience with support.

Dont order from Fosi directly!

 

[JLB321GO]

Dont order from Fosi directly!

That's my experience also. Order from Amazon, and return it if you're not happy. No questions asked.

 

[Fosi Audio]

Everybody talk about good customer experience of @Fosi Audio , mine is one of the worst i had. After almost 3 months , i have no monos( stuck in Spanish customs) , money is gone, i was a pledger, and @Fosi Audio doesn´t provide a solution. What a scam.

Sorry for the bad experience. Let me help you resolve it.

 

[Bernard23]

So is Amazon still shipping the reverse polarity versions?

The ones I received last week from amazon UK were the correct polarity.

 

[burkm]

How many QC stickers are at the bottom ?
Different Amazon.xx may have old and new deliveries, which could be of different status.

 

[Bernard23]

How many QC stickers are at the bottom ?
Different Amazon.xx may have old and new deliveries, which could be of different status.

Afraid I can't recall, I don't have the amps as I returned them

 

[Mort]

Are there any good reasons to put a DAC in between a Wiim Ultra and a pair of Fosi V3 monoblocks? I have an extra DL200, for instance.

 

[Brian Hall]

Are there any good reasons to put a DAC in between a Wiim Ultra and a pair of Fosi V3 monoblocks? I have an extra DL200, for instance.

Not for audio quality.

 

[antcollinet]

Are there any good reasons to put a DAC in between a Wiim Ultra and a pair of Fosi V3 monoblocks? I have an extra DL200, for instance.

None at all with one minor exception:

In the unlikely event you were to experience audible ground loop noise picked up between the Ultra and the amps, then an improvement might be achieved using your DAC with an optical connection between the Ultra and the DAC, which would eliminate ground loops between Ultra and Amp.

 

[ninetylol]

Are there any good reasons to put a DAC in between a Wiim Ultra and a pair of Fosi V3 monoblocks? I have an extra DL200, for instance.

Yes, so you can use XLR. (which got way lower thd on v3 mono)

 

[antcollinet]

Yes, so you can use XLR. (which got way lower thd on v3 mono)

Again - only beneficial if experiencing audible ground noise without the XLR.

(which got way lower thd on v3 mono)

Just the standard and expected 6dB resulting from the lower voltage/higher gain. Still inaudible.

 

[SMen]

Are there any good reasons to put a DAC in between a Wiim Ultra and a pair of Fosi V3 monoblocks? I have an extra DL200, for instance.

https://archimago.blogspot.com/2024/08/part-ii-fosi-audio-v3-mono-amp-class-d.html
Check out this review with measurements and listening for any benefits to the balanced option your DL200 might bring.
Given you have both options you could try both and give feedback here, or on the user impressions thread. Part 1 of this article is interesting too, and compliment the review (I think) by Amir.

 

[Sokel]

Just the standard and expected 6dB resulting from the lower voltage/higher gain. Still inaudible.

More like 13-14dB at the same voltage and different,highest gain (Arch also measures XLR with 2V output,so it's easy to compare)

 

[Mort]

If I were to do that (add a DAC like the DL100) for the dB gain or hum, with the Wiim DAC managing the subwoofer, do I potentially introduce 'timing' issues?

 

[ninetylol]

If I were to do that (add a DAC like the DL100) for the dB gain or hum, with the Wiim DAC managing the subwoofer, do I potentially introduce 'timing' issues?

no and you could also adjust sub timing within the wiim app btw

 

[SMen]

If I were to do that (add a DAC like the DL100) for the dB gain or hum, with the Wiim DAC managing the subwoofer, do I potentially introduce 'timing' issues?

Try it and see ...
I've a pair of subwoofers which have line level volume and cut off adjustment as well as speaker level. I often have found integration easier with the speaker level inputs - but that is with adjustment by ear, where you try and get them to the level where they (the subwoofer(s)) are just detectable.
At the moment I have them connected via the line level inputs from a volume passive pre-amp which also has balanced outs.

I'm not sure theoretical views on this are the answer. I think you are in the position where you might try it and advise on your use case for others.

Post edit: and actually seeing @ninetylol 's reply above - this is a very good point ... kind of giving me an excuse to think of a wiim too!