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Amplifier V3 Monoblock with PFFB Implementation is Coming!

Fosi Audio Team

Fosi Audio Team

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We know many of our fans are waiting for this monoblock! We'll post updates about this amazing amp in this thread.


Jan 25 Update:
Let's take a glance at some measurements first
PFFB technology was implemented and load Independence was achieved!
pffb.jpg

SINAD
sinad.jpg


March 21 Update:
1711018481818.png

April 1 Update:
The landing page of the V3 Mono is available! Pls check the details of this monoblock
fosiaudio.com

Fosi Audio V3 Mono Monoblock Power Amplifier

The V3 MONO is a monoblock high-power amplifier integrated with the Texas Instruments TPA3255 amplifier chip, suitable for speakers of 2Ω to 8Ω impedance. It implements Post-Filter Feedback (PFFB) technology, addressing the long-standing issue of load-dependency in Class-D amplifiers.
fosiaudio.com fosiaudio.com

April 2 Update:
The first review of the V3 Mono unlocked! Check the measurement by AudioScienceReview right away!
www.audiosciencereview.com

Fosi Audio V3 Mono Amplifier Review

This is a review and detailed measurements of the Fosi Audio V3 Mono class D amplifier. It was sent to me by the company. The price with the power supply I tested is US $139.99. I must say the concept of a "monoblock" amplifier in such a small size runs foul of any expectation a longtime...
www.audiosciencereview.com www.audiosciencereview.com
 
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And what will the owners of the "old" V3 do?! There is information on how it is not expensive to upgrade to the existing V3, on the ASR forum. The most elegant solution is that you make one small PCB and we solder it nicely DIY?!!! Of course we will pay for that little beast!!!
 
asimze said:
And what will the owners of the "old" V3 do?! There is information on how it is not expensive to upgrade to the existing V3, on the ASR forum. The most elegant solution is that you make one small PCB and we solder it nicely DIY?!!! Of course we will pay for that little beast!!!
Click to expand...
We'll first introduce the PFFB to the V3 mono. Then we'll work on introducing it to the V3 too.
 
I must admit to liking Fosi’s enthusiasm for new ideas, but I’m getting a little confused… on the Facebook page we have polls regarding a new Hypex core module, not sure about PFFB as it is based around the NC252 model And as far as i can tell this would be in the ‘Z‘ range as the amp board is a balanced design. PFFB will be reserved for the V3 Monoblock I think, which I think will be a proper one channel amp, two needed for stereo… however… what might surface in the words of Bubble from Ab Fab “who can tell”! 😊
 
Joseph E Smith said:
Now we also need a great preamp to pair with these monoblocks!
Click to expand...
That’s just what it was thinking! Not that the P3 isn’t fun, and it works great with the V3, but perhaps something with some serious specs maybe? I know lots of folk over at ASR (grimaces) abhor tubes, but it’s pretty well known that they make a perfect compliment to the often super sterile Class D sound… just saying 😎

PS. Funny thing is I just tried a £700 preamp with the V3 and it was, well, uninteresting really. Whereas the P3 doesn’t so much warm the sound as give that extra something that makes it really sing, in my system anyway - one wonders what the chemistry is for that? 🤔
 
Joseph E Smith said:
Now we also need a great preamp to pair with these monoblocks!
Click to expand...
Something like the Schiiit Freya + but with dedicated sub out (double) and a variable high pass filter. I can do without a passive preamp function, but the possibility of op amp rolling should be added. With op-amps + tubes you can tailor it to you needs and preferences. Class A would be great.
 
I participated in the post of V3 on the ASR forum. I am glad that the FOSI V3 can win the interest of many DIYER. I believe Mono will be a new start
 
This is indeed exciting news, the ZA3‘s have already been so highly praised on the net so I can‘t wait to hear what FOSI will bring to the table with these new V3 Monoblocks and also the 48v/10A PS. Well done FOSI, you really are pushing new boundaries.
 
That introduction to the "V3 Mono" product with PFFB posted to me led to some unexpected messages, which still i.e were addressing the SK02, which I bought already on Amazon.de...
Other responses of mine to those notifications / news led to "nothing" (Kickstarter) or got lost somehow / ended in "nowhere land".
 
Keen to try these with diy electrostatic builds. I have various ab and d class amps to compare these with so can't wait to get my hands on a pair.
 
The first review of the V3 Mono unlocked! Check the measurement by AudioScienceReview right away!

www.audiosciencereview.com

Fosi Audio V3 Mono Amplifier Review

This is a review and detailed measurements of the Fosi Audio V3 Mono class D amplifier. It was sent to me by the company. The price with the power supply I tested is US $139.99. I must say the concept of a "monoblock" amplifier in such a small size runs foul of any expectation a longtime...
www.audiosciencereview.com www.audiosciencereview.com
 
Am I right to say there is basically still a pre-amplication stage in the V3 mono. Just no volume attenuator, but the op-amps will pre-amp the signal to the chip.
 
This is exciting and I'm looking forward to the launch. Can you tell me about the audio detection circuit? It puts the amps into standby after 10min but does it also take them back into "on" after detecting a signal? Is there a lag and if so how long? Is there a threshold that the signal must exceed for it to work? Thanks!
 
Dear @Fosi Audio Team ,

I'm an audio engineer-technician-enthusiast and came here via the AudioScienceReview (ASR) Forum.

I'm currently an owner of your ZA3 amplifier and as a first-time Fosi customer... I am already quite impressed by this model. The inclusion of XLR/TRS inputs, and the ability to upgrade the Op-Amps convinced me to make the purchase. Balanced inputs are more-or-less a requirement for professional/studio use-cases. Op-Amp rolling is a very fun and cool way for 'audiophiles' to tune the sound as they like. So, I wish your products great success to getting into the professional and audiophile markets :). Anyway...

I was waiting patiently and looking very forward to your implementation of PFFB, and the possible development of a 48v/10a power supply. From the measurements currently available, it seems like you have done a great job!

For your new V3 Mono Kickstarter, I noticed that there is no option to order two (2) or more 48v/10a power supplies at the same time. IMHO, the availability of this new power supply is really really cool. I have been looking for such a power supply for months TBH. For obsessed audio enthusiasts like me who prefer/insist to over-spec power, such a power supply is a dream come true.

So it would be great if Kickstarter buyers could add additional power supplies to their order. This would simplify the ordering process and require only one order and delivery.

As an aside:

Ultimately, I would use one (1) 48v/10a power supply per amp AND upgrade the 48v/5a power supply for my ZA3 as well. (It doesn't matter if people say there is no point, I would still do it).

My ultimate goal will be to horizontally bi-amp my top speakers with four (4) mono amps which their own power supplies, and use my ZA3 to power my subwoofer(s). Bi-amping is a really cool thing to do with your V3 Mono and I am looking forward to trying out this setup.

Thank you for the ZA3 and looking forward to your V3 Mono!
 
Hi,As I've mentioned in my previous messages, I have a hobby related to music, both as a listener and as a musician. I play the piano and have a small home recording studio. Currently, I use a professional Apollo audio interface from Universal Audio, to which I have connected two active Adam Audio monitors with balanced cables.

This V3 mono, besides its appreciable characteristics for hi-fi systems, seems to open a window for home recording studios as well. These studios could directly utilize the excellent passive speakers they already own without needing to purchase separate powered speakers. 2 V3 mono amplifiers with PFFB implementation, connected via XLR, with their unaltered sound, would indeed allow direct monitoring of a professional audio interface while maintaining pure sound quality.
 
qozzie said:
So it would be great if Kickstarter buyers could add additional power supplies to their order. This would simplify the ordering process and require only one order and delivery.
Click to expand...
Thank you for your great advice. We'll provide the option to add additional PSUs as you suggested. 😁
 
Massimo said:
Hi,As I've mentioned in my previous messages, I have a hobby related to music, both as a listener and as a musician. I play the piano and have a small home recording studio. Currently, I use a professional Apollo audio interface from Universal Audio, to which I have connected two active Adam Audio monitors with balanced cables.

This V3 mono, besides its appreciable characteristics for hi-fi systems, seems to open a window for home recording studios as well. These studios could directly utilize the excellent passive speakers they already own without needing to purchase separate powered speakers. 2 V3 mono amplifiers with PFFB implementation, connected via XLR, with their unaltered sound, would indeed allow direct monitoring of a professional audio interface while maintaining pure sound quality.
Click to expand...
Yes, we believe the V3 mono will provide many possibilities for music listeners and musicians.;)
 
Bonjour FOSI et bravo pour l'idée de la V3 mono !
Qu'est-il possible d'utiliser comme OP-AMP, voyant que vous avez mis une possibilité de changement de cette puce ?
VIVEMENT LE 20 AVRIL!!!
 
GAUTHIER Hugues said:
Bonjour FOSI et bravo pour l'idée de la V3 mono !
Qu'est-il possible d'utiliser comme OP-AMP, voyant que vous avez mis une possibilité de changement de cette puce ?
VIVEMENT LE 20 AVRIL!!!
Click to expand...
Bonjour, le V3 Mono prend en charge les amplificateurs opérationnels doubles discrets en boîtier DIP8, tels que le Sparkos SS3602, le MUSES02, l'OPA2604, et d'autres.
 
Glad to see the Kickstarter offer underway!
But is there no way to pledge for 2 units with no power supplies???
Do I have to pledge twice to accomplish this?

UPDATE: All pledged up for the V3 Mono's! Turns out there was no option to order two bare units with no power supplies. So I had to choose the option WITH power supplies. Since I'm planning to replace my current ZA3's with the Mono's, I don't really need new power supplies. Oh, well.
 
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Well, that's me all signed up for 2xV3 Mono's and 2x48v PSU's.
What I need now is a matching, good quality, RCA to XLR line level converter box.
Then my miniDSP 2x4HD - which only has 2V RCA outputs - could take advantage of the 4v XLR inputs on the Mono's.

Addendum:
I No longer have a need for any kind of RCA/XLR converter!
I have bit the bullet and updated my miniDSP 2x4 HD to the balanced version of the miniDSP Flex.
I will now be able to hit that much vaunted 100 dB SINAD figure!
 
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Important!
re: 48V 10A power supply

Dear @Fosi Audio Team

I am writing to you here first, due to some extensive discussions going on in one of the major forums regarding your product "48V 10A Power Supply" and noticed that there are also questions regarding this matter in the Kickstarter campaign's comments section. I have not found anywhere information from Fosi Audio that answers the user enquiries.

Additionally, you are already aware that a major reviewer used one (1) of these '10A' units to power two (2) V3 Mono test samples, and one (1) test sample stopped functioning while under a very stressful series of tests.

Having looked at your website's product page here: https://fosiaudio.com/products/power-supply-adapter-48v-5a-10a
and the product image for the 10A model shows the Make & Model Number: Huntkey hka30048063-7d
This model is rated at only 6.25A CONTINUOUS, and 10A MAX

This is not the expectation of most supporters of your Kickstarter campaign.
It definitely was not my expectation when I personally pledged for two (2) V3 Mono amplifiers, and two (2) 10A power supplies.
This could also explain the failure of the unit being tested by the reviewer using only one power supply to power both amps.

I understand that the world of 3rd party power supplies can be a bit murky, but considering the significant price increase of ~83% for what looks like just 1.25A of extra continuous current, maybe a better performing or more price competitive 10A power supply can be found?
One of your competitors offers a '10A GAN power supply' for ~$80 USD via their website.

Looking very forward to your response.
Quoc
 
qozzie said:
Important!
re: 48V 10A power supply

Dear @Fosi Audio Team

I am writing to you here first, due to some extensive discussions going on in one of the major forums regarding your product "48V 10A Power Supply" and noticed that there are also questions regarding this matter in the Kickstarter campaign's comments section. I have not found anywhere information from Fosi Audio that answers the user enquiries.

Additionally, you are already aware that a major reviewer used one (1) of these '10A' units to power two (2) V3 Mono test samples, and one (1) test sample stopped functioning while under a very stressful series of tests.

Having looked at your website's product page here: https://fosiaudio.com/products/power-supply-adapter-48v-5a-10a
and the product image for the 10A model shows the Make & Model Number: Huntkey hka30048063-7d
This model is rated at only 6.25A CONTINUOUS, and 10A MAX

This is not the expectation of most supporters of your Kickstarter campaign.
It definitely was not my expectation when I personally pledged for two (2) V3 Mono amplifiers, and two (2) 10A power supplies.
This could also explain the failure of the unit being tested by the reviewer using only one power supply to power both amps.

I understand that the world of 3rd party power supplies can be a bit murky, but considering the significant price increase of ~83% for what looks like just 1.25A of extra continuous current, maybe a better performing or more price competitive 10A power supply can be found?
One of your competitors offers a '10A GAN power supply' for ~$80 USD via their website.

Looking very forward to your response.
Quoc
Click to expand...
Hello, our 48V/10A power supply supports a stable output of 10A. Below is a video of our actual test of this power supply. This model was custom-made for us by Huntkey and is not the same as their other 6.25A power supply.
 
If using two V3 Monoblocks as a stereo pair, is there any performance advantage to utilizing two of the 10A power supplies versus utilizing two of the 5A power supplies? Please let us know. Thank you.
 
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