Fosi Audio V3 Mono Amplifier Review

[EugeneDebs]

Can you give some info on your 10amp power bricks please.
Voltage,manufacturer, type, andwhere to purchase.

Thank you

On the Fosi site, one of the bundles is one V3 mono with one 10A brick. https://fosiaudio.com/products/fosi-audio-v3-mono-power-amplifier?variant=45168133636326

 

[Danielck78]

I am really interested to get a pair of V3 Mono amp, but saw there is a lot of issue with the amp burning. Not sure if Fosi have solved the issue with newer batch of V3 mono? Anyone who recently bought the V3 mono encountered any issue?

 

[antcollinet]

but saw there is a lot of issue with the amp burning

What issue with amp burning?

 

[EddNog]

What issue with amp burning?

Probably a somewhat exaggerated way to say overheating and thermal failure.

-Ed

 

[antcollinet]

Probably a somewhat exaggerated way to say overheating and thermal failure.

-Ed

Has there been any significant evidence of that though? Other than the odd report of someone's amps failing, and the common misapprehension that "feeling warm" is "overheating"

 

[EddNog]

Has there been any significant evidence of that though? Other than the odd report of someone's amps failing, and the common misapprehension that "feeling warm" is "overheating"

If there is, I haven’t seen it. My dad listens a few hours a day with the V3 Monos I gave him, driving Maggie LRS+ to levels a good bit higher than I listen to, and has had zero issues so far.

-Ed

 

[antcollinet]

If there is, I haven’t seen it. My dad listens a few hours a day with the V3 Monos I gave him, driving Maggie LRS+ to levels a good bit higher than I listen to, and has had zero issues so far.

-Ed

I suspect this is the experience of almost all owners. Just like any product though, there can be some early life failures.

 

[Bleib]

I am really interested to get a pair of V3 Mono amp, but saw there is a lot of issue with the amp burning. Not sure if Fosi have solved the issue with newer batch of V3 mono? Anyone who recently bought the V3 mono encountered any issue?

As far as I know Erin's audio corner is the only one that has burned up one amp

 

[Danielck78]

As far as I know Erin's audio corner is the only one that has burned up one amp

There are many reported case in Fosi's forum and review page. I saw a few here as well. Go back 1 page you can see there's a few reported. Youtube Reviewer New Record Day also had one burned.

 

[antcollinet]

There are many reported case in Fosi's forum and review page. I saw a few here as well. Go back 1 page you can see there's a few reported. Youtube Reviewer New Record Day also had one burned.

If people (EG Erin) are killing them doing full power sine sweeps as tests, that is a whole different ball game from breaking them listening to music.

There is a reason Amir doesn't do that here - especially with people's loaned units.

 

[gwing]

There are many reported case in Fosi's forum and review page. I saw a few here as well. Go back 1 page you can see there's a few reported. Youtube Reviewer New Record Day also had one burned.

Well I can give you a contrary report that my 300s have always run flawlessly and at comfortable temperatures when working, completely cool to the touch when in standby. Does that help

That said i just play music on mine in normal sized room at levels that won't damage my hearing so they aren't really being stressed at all. Their single 10A supply is sufficient as well - I haven't needed to get the second power supply I had originally considered.

 

[Owis]

Well I can give you a contrary report that my 300s have always run flawlessly and at comfortable temperatures when working, completely cool to the touch when in standby. Does that help

That said i just play music on mine in normal sized room at levels that won't damage my hearing so they aren't really being stressed at all. Their single 10A supply is sufficient as well - I haven't needed to get the second power supply I had originally considered.

What are “300s” ?

 

[kingkoolkris]

One of mine died. Received a replacement board from Fosi within 14 days.
Don't know the cause though.

 

[gwing]

What are “300s” ?

Must have been a minor brain fade, I was referring to V3 monos.

 

[pma]

One of mine died. Received a replacement board from Fosi within 14 days.
Don't know the cause though.

Probably another candidate to fail FTC preconditioning at 1/8 of rated power.

 

[roog]

I am thinking of 'strapping' one of these to the back of each of my passive stereo speakers (I might strap each amp to a small stand) and running very short cable to the speaker terminals, the line level signal cables will be 7ft or so long.

Can you see any issues with doing this?

 

[Rotel75]

I am thinking of 'strapping' one of these to the back of each of my passive stereo speakers (I might strap each amp to a small stand) and running very short cable to the speaker terminals, the line level signal cables will be 7ft or so long.

Can you see any issues with doing this?

I plan to do the same. I ordered two properly shielded 3m RCA cables and two 36V/6A power supplies.
What makes me worry are the possible vibrations from the speakers.
But I think digitial devices with clocks are more sensitive than amps (see active speakers).

 

[roog]

I plan to do the same. I ordered two properly shielded 3m RCA cables and two 36V/6A power supplies.
What makes me worry are the possible vibrations from the speakers.
But I think digitial devices with clocks are more sensitive than amps (see active speakers).

I understand your concerns.

I also worry about thermal dissipation. Whether the V3 is 'strapped' on to the rear of the speaker or fixed to a separate stand I would like to orientate it vertically and I wondered if this would limit its heat dissipation to its detriment?

 

[gwing]

I am thinking of 'strapping' one of these to the back of each of my passive stereo speakers (I might strap each amp to a small stand) and running very short cable to the speaker terminals, the line level signal cables will be 7ft or so long.

Can you see any issues with doing this?

You may want to use XLR signal cables rather than RCA to minimise interference.

 

[somebodyelse]

I understand your concerns.

I also worry about thermal dissipation. Whether the V3 is 'strapped' on to the rear of the speaker or fixed to a separate stand I would like to orientate it vertically and I wondered if this would limit its heat dissipation to its detriment?

Orient it with the holes top and bottom instead of on the sides and the dissipation will probably be improved. Keep some space on all sides for convective airflow.