Fosi Audio V3 Mono Amplifier Review

[Sokel]

The diagram is about the total power of 2 channels. At 300W that would be about 60W
We remember the old light bulbs, how hot they were with 60W

Yep,and the diagram is for 8,6 and 4 Ohm.Extrapolating it for 2 Ohm will reach a little higher than that.

 

[LeonidKogan]

Is it known what is going to be the retail price for V3 Mono with separate 48V/5A PS? I'm within return window for dual ZA3 which I find amazing and thinking about going for V3 mono instead.

 

[JW001]

I did that (went to a minidsp with Dirac from marantz with audyssey) and are now going back because in my case the AVR room correction was far superior than the minidsp.

The minidsp without room correction sounds phenomenal though, but my room is garbage.

Without room correction, what makes it sound phenomenal?

 

[sl1982]

Is it known what is going to be the retail price for V3 Mono with separate 48V/5A PS? I'm within return window for dual ZA3 which I find amazing and thinking about going for V3 mono instead.

Working the number backwards at 980 HKD at 20% off would give you a retail of 1225 HKD. Roughly 155 USD

 

[sucramhabib]

I did that (went to a minidsp with Dirac from marantz with audyssey) and are now going back because in my case the AVR room correction was far superior than the minidsp.

The minidsp without room correction sounds phenomenal though, but my room is garbage.

Yep! I had a Minidsp with Dirac and it neutered music. It was terrible

 

[wwenze]

Turns out room reflections are nice yea?

 

[sucramhabib]

Turns out room reflections are nice yea?

Unfortunately they’re not.

 

[Down South]

Lots of houses are built using outdated materials. In a lot of European houses they use terrible clay blocks with a hard plaster finish and tiled floors creating a really harsh reflective sound. In the USA I watch programmes showing just how flimsy the construction is and interior walls about 4" thick using single skin plasterboard with rock wool insulation, incredible. No wonder both types require 'room correction'.

 

[r3uba6HBHa2Ye7F]

is there much sonic difference when using 2x 48V 5A VS 2x 48V 10A? or is it more about having more available supply in case the amp needs it? (to prevent clipping maybe?)

thanks

 

[r3uba6HBHa2Ye7F]

Hahh this is exactly what I'm doing. I don't say it is an improvement but my dac has only balanced outs. I was thinking to get the monos but why should I when I can simply add a balanced xlr pigtail to my v3?
CMRR get a small hit but the wire is very short and double shielded so doesnt matter.

View attachment 371756
In case someone needs it:
Pin1 +
Pin4 gnd
Pin7 -

question please, are you saying you connected the XLR input directly to the DIP8 socket?

Also, did you have to do anything to the XLR socket (like maybe cutting the pins so they are not soldered to the PCB? Thanks

 

[r3uba6HBHa2Ye7F]

5. In comparison to the aforementioned Fosi monoblocks, the Fosi 3 PFFB STEREO represents a superior value proposition for the average home audio consumer, particularly in the context of power supply overloading and beat interference.

Is "Fosi 3 PFFB STEREO" the ZA3 model? thanks

 

[Guddu]

Is "Fosi 3 PFFB STEREO" the ZA3 model? thanks

No, ZA3 is non-PFFB topology.
Fosi’s PFFB stereo topology hasn’t come out yet.

 

[Guddu]

is there much sonic difference when using 2x 48V 5A VS 2x 48V 10A? or is it more about having more available supply in case the amp needs it? (to prevent clipping maybe?)

thanks

There are lots of posts on this topic in this thread, but summary is that there isn’t any considerable difference in performance.
If you are keeping units far apart then consider the splitter cable length.

 

[Megaken]

Is there a way to tell when my unit would be shipped

 

[EddNog]

Is there a way to tell when my unit would be shipped

They said 6/15 on the last Kickstarter update.

-Ed

 

[staticV3]

Is there a way to tell when my unit would be shipped

 

[Marss72]

Does anyone have experience with swapping op amps on the Fosi V3/ZA3? I am curious which op amps you guys rolled and what it did with the sound?

 

[Talisman]

Does anyone have experience with swapping op amps on the Fosi V3/ZA3? I am curious which op amps you guys rolled and what it did with the sound?

...... I hate you @Fosi Audio

 

[antcollinet]

Does anyone have experience with swapping op amps on the Fosi V3/ZA3? I am curious which op amps you guys rolled and what it did with the sound?

This is not how op amp circuits work.

it doesn't matter what op amps are used. If they are compatible they wont alter the sound in any meaningful way. in the worst case, they'll not be compatible, and they will destabilise the amp.

 

[joostdh]

Does anyone have experience with swapping op amps on the Fosi V3/ZA3? I am curious which op amps you guys rolled and what it did with the sound?

There are multiple videos on YouTube, including by Fosi itself, that demonstrate this. Be aware of the limitations of audio over YouTube when comparing though. I would recommend this video by Virtual Hifi as the maker also offers an audio uncompressed download.