Fosi Audio V3 Amplifier Review

[gwing]

Can the fosi v3 use the higher current of the 10a vs 5? Or is it capped at 5a?

5A should be sufficient, that is the rating of your existing power supply isn't it? If you have low impedance speakers maybe the 10A would be better when pushed hard but it is really overkill, and there again if you have low impedence speakers you probably don't need to change from 38v to 48v in the first place.
Essentially any of those Fosi supplies should work fine - personally I would likely go for the 5A Gaan option as I don't push my amps hard.

 

[VientoB]

Would I notice an improvement in bass presence changing to the 3e Audio A5?

 

[antcollinet]

Would I notice an improvement in bass presence changing to the 3e Audio A5?

Unlikely unless you are currently driving the V3 into clipping.

 

[VientoB]

Unlikely unless you are currently driving the V3 into clipping.

Presumably the A5 will go louder, though, and that includes dynamic peaks?

 

[antcollinet]

Presumably the A5 will go louder, though, and that includes dynamic peaks?

Not significantly - and then only if you are comparing the V3 using the 32V PSU, when it has 1.7dB less power.

If you use the 48V PSU with the Fosi, then it has 1.8dB more than the A5.

Either way - not a significant difference.

 

[VientoB]

Not significantly - and then only if you are comparing the V3 using the 32V PSU, when it has 1.7dB less power.

If you use the 48V PSU with the Fosi, then it has 1.8dB more than the A5.

Either way - not a significant difference.

How about when using balanced inputs on the A5?

 

[antcollinet]

How about when using balanced inputs on the A5?

It wont make any difference to the power availability or the dynamics. Balanced inputs simply provide the benefit of common mode noise rejection.

 

[VientoB]

It wont make any difference to the power availability or the dynamics. Balanced inputs simply provide the benefit of common mode noise rejection.

Balanced has double the voltage though?

 

[antcollinet]

Balanced has double the voltage though?

And half the gain which directly compensates the higher voltage.

Even if the gain were the same it wouldn't impact power availability - you'd just have to turn down the volume on the balanced inputs to get the same power. The amp would still run out of steam at the same power level.

 

[Shanebow]

Well when everything was said and done I decided let the chifi solution wait for the next generation of improvements and went older school for the time being and got an Adcom GFA 5400 amp and GTP 450 pre amp. That should do the job acceptably until I can find a great deal on a monster amp.

 

[antcollinet]

Well when everything was said and done I decided let the chifi solution wait for the next generation of improvements and went older school for the time being and got an Adcom GFA 5400 amp and GTP 450 pre amp. That should do the job acceptably until I can find a great deal on a monster amp.

Hi Welcome to ASR.

That's a nice setup. Probably not much need to upgrade if it has the features you need.

Just gonna point out one of the local guidelines:

Let's Avoid the Term Chi-Fi

I often see the use of the term "Chi Fi" to describe audio products from China. I see the intention and don't think anyone is trying to be racist and what have you. Still, I like us to show the highest respect to products from around the world. As avid readers of this forum know...

www.audiosciencereview.com

 

[Shanebow]

Hi Welcome to ASR.

That's a nice setup. Probably not much need to upgrade if it has the features you need.

Just gonna point out one of the local guidelines:

Let's Avoid the Term Chi-Fi

I often see the use of the term "Chi Fi" to describe audio products from China. I see the intention and don't think anyone is trying to be racist and what have you. Still, I like us to show the highest respect to products from around the world. As avid readers of this forum know...

www.audiosciencereview.com

Ok no problem. You know, I have definitely had this conversation with myself in the recent past, to the point where I even parenthetically asked after posting the word in one of my threads somewhere if this is a term that could imply anything other than Chinese High Fi. I probably just should not have used it to begin with and avoided the whole tempest in a teapot. I'm sorry and I'm moving on. Definitely not meant disrespectfully and I hope no one took it that way.

 

[antcollinet]

Ok no problem. You know, I have definitely had this conversation with myself in the recent past, to the point where I even parenthetically asked after posting the word in one of my threads somewhere if this is a term that could imply anything other than Chinese High Fi. I probably just should not have used it to begin with and avoided the whole tempest in a teapot. I'm sorry and I'm moving on. Definitely not meant disrespectfully and I hope no one took it that way.

It's not a problem - Youre relatively new here - not expected to know all the local quirks.

 

[obsessive9119]

My V3 arrived today. I scored a pair of KEF Q 15.2s on Marketplace and wanted something small to drive them as desk speakers.

I’ve had a ZA3 in my main system driving LS50 Metas for about a year and it has been great. I almost bought another one, but the V3 was almost half the price on Amazon and I don’t need the trigger or 48v PSU in this scenario.

The build quality of the V3 is surprisingly good. It looks and feels way better in person than I’d expected and seems to do an excellent job driving the KEFs. The step up of this combo from my old Edifier MR3s is astounding.

 

[dott]

The first thing I did after receiving it was to replace that blue spotlight with a nice orange LED and insert a light diffuser into the hole for the LED.

Also, on the product page on AliExpress, there is such information:

I did some tests and it seems that my unit can control the pre-out level.

 

[VientoB]

Looks good with the orange LED

 

[JSG1469]

I recently ordered two V3's from Fosi's certified renewal department for $83 each, complete with a 48v power supply and 2 day FedEx shipping. I was curious if they could power my vintage AR 2ax and 4x speakers? Yes they do and with ease! I am really impressed with the clear detailed highs and mids. The bass is low with a solid punch and while I've read that was their weakness, my 10' sub won't be needed. I'm using them as power amps, fed by my Waxwing and Rotel preamp, I'm very happy. As a long time class A user, I believe I may be a class D convert. I would like to hear from any users out there that have had their V3 for an extended period about their longevity with daily 3 to 4 hours of use and if you've experienced any problems?

 

[TheWalkman]

I recently ordered two V3's from Fosi's certified renewal department for $83 each, complete with a 48v power supply and 2 day FedEx shipping. I was curious if they could power my vintage AR 2ax and 4x speakers? Yes they do and with ease! I am really impressed with the clear detailed highs and mids. The bass is low with a solid punch and while I've read that was their weakness, my 10' sub won't be needed. I'm using them as power amps, fed by my Waxwing and Rotel preamp, I'm very happy. As a long time class A user, I believe I may be a class D convert. I would like to hear from any users out there that have had their V3 for an extended period about their longevity with daily 3 to 4 hours of use and if you've experienced any problems?

I bought a V3 when they were first released. I couldn’t find the receipt but am fairly certain it was September of 2023. I have the amp connected to an Amazon Alexa to power a pair of Elac DBR62s.

The amp has been powered on, virtually continuously, for two and a half years and it is used virtually every day to stream music, news, podcasts, etc. unless I’m on vacation. There have been no issues at all.

Like a lightbulb in your home, turn it on, stop worrying and focus your energy on finding some great, new music tracks and enjoy your new setup. All will be fine.

 

[burkm]

The dawn and reappearance of class D amps had happened just prior. With the introduction of the PFFB technology this may improve further. TI might even provide a new and more powerful incarnation of the 3255 chip. We will see....

 

[trevor_bartram]

The dawn and reappearance of class D amps had happened just prior. With the introduction of the PFFB technology this may improve further. TI might even provide a new and more powerful incarnation of the 3255 chip. We will see....

A couple years ago I bought a V3 Stereo 32V $70 as a backup amp. I tried it, it worked fine then stored it away. A casual observation, most 3255 PFFB implementations only reduce peaking slightly, I'm unsure why that is? I reasoned if your speaker impedance doesn't rise at high frequency (mine don't) then peaking isn't a problem!