Fosi V3 Mono - They FINALLY Added It! 

I wanted to know the details of these - and I couldn't have picked a better video - fantastic. You covered all the most important points, without any hype. Thanks Matt.

Now Fosi needs to make a matching preamp. One with a display that can be read from 10' - 15' away and simple remote.

Your videos continue to improve and your review style of direct and easy to understand is greatly appreciated. I don't care for the overly statistical nor subjective, just what will I get for the money.

Good review Matt ... Nicely done as usual. One thing I would point out... The "load dependency" issue so many go on about isn't the deal breaker most seem to think it is. Look at the charts on ASR for other TPA3255 amps and you will discover that all this fuss is being made over less than 1db of variance ... in most cases less than half a DB. (Scale matters!) And since this is happening way up in the brilliance part of the audio band (above 10khz) it is beyond unlikely that anyone other than Batman is ever going to hear it. Adding Post Filter FeedBack pushes this further up into the spectrum but it does not completely eliminate it. In fact it makes less than half a DB of difference. (Again... Scale Matters) What happens with the "zoomed in" charts they're using in the analysis is that people see a bump in a line, fail to realize that we're talking about half a db at ~90db spl and tend to exaggerate the issue beyond all reason.

I'm very happy with my ZA3 mono block Linton setup and it doesn't sound like these would be an upgrade. I'd be very interested in a low cost Class D monoblock configuration that would match the 3D soundstage and sound separation of better Class A/B amps as well as 200watts/8ohm per channel.

Best review out there on these V3 monos. Thanks.

Excellent review. Thank you!

I enjoy your consistent and informative audiophile content! I am in Tokyo. The second hand market here is quite amazing! Though these Fosi amps are on my wish list now because of your overview and evaluations! Thanks 😅

I always look forward to your videos. You're making me forget that it's 30 degrees outside. LOL The British Audiophile gave the original V3 a highly recommend, so I'm sure these sound great too. And thank you for not using the word caramelly.

Matt, thank you for update on Fosi V3 monoblocks. I understand that the WiiM Ultra will be introduced on May 9th.

I’ve got these ordered, and will probably pair them with a Wiim Ultra. Should be a pretty nice setup for my streaming + turntable needs.

Great review! The idea that these mini amps only drive desktop speakers is just a myth. I drive large floor standers (8 ohm / 90 dB) and a 160 liter subwoofer with two Aiyima 07 amps with ease. They replaced my class A tube and a 60 watt vintage 14 kg monster and sound wise, they hold up or even surpass. When my 07's give up one day i will replace them with a Fosi V3 or upgraded version. These TPA 3255 amp's are the future of low price high end!

I didn't realize previous Fosi's & other's hadn't had the Post Feedback Filter (PFF)!! My 3e-audio TPA3255 chipamps have had PFF since 2017, but I've been using the Fosi's V3 mostly these days because they have a case & volume knob, but it makes me really respect these old 3e-audios I've had for being so early to the game & doing so well with these amazing TPA3255 chips. I wonder what super-chip will come along next, what an even better future could possibly be? Will someone bring GaN into a semi affordable range? It's gonna take a lot to surpass the TPA3255! Very fun look at this amp, thanks!

Must admit I bought a Fosi ZA3 to experience what they were talking about. Didn't expect it to surpass my Rega Aethos, but must admit that with lightly driven vintages like the Beovox 1100 or 2200, system matching makes the ZA3 surpass here. Looking forward to hearing Lowther Bicor 1000 and Zu Audio Cube MKii at class d... With that in mind, I'll have to try the mono V3, with the Aethos as a preamplifier... Work, Consum, Die;)

This was such a concise yet comprehensive overview. Really appreciated, as so many (well I) have been kinda nutzo following this progression of chip amps. Really finding it hard to resist trying these. Speculation and evil game, but now wondering how they’d differ from a pair of GaN monos like Orchard Audio amps👍🏼🙏🏼

Thank you Matt. My next purchase...in a couple of weeks(I'm saving up).

I have the old Fosi Audio P1 tube preamp for years (the 2021 product), I thinks it is the best pair for V3 mono.

I have a Purifi Eigentact Eval 1 based amp which is a SOTA product and I would not hesitate to replace it with a couple of V3 Monos if, for some reason, the Purifi died and was beyond fixing. As it is, I'm probably going to be buying one or two of these for surround channels.

I was going to wait for this new amp, but it doesn't have a sub-out, so I went for a couple ZA3's....

I wish Fosi offered their amps that have switchable op-amps WITH the (becoming legendary) SparkoS Labs units for a price savings.

Very informative, thank you for the video. Seems that the V3 mono is going to be the "next big thing", at least until the WiiM Ultra comes around. Maybe that will be the winning combination...

you want separate power supplies, isn't that part of the point of having mono blocks?

This would match well with Fosi's new GaN 48V power supply and squeeze out every bit of performance from the stock monoblock.

Matt, you do some of the best reviews on the internet. And I am not just saying that. On point, no nonsense and a fantastic presentation. I had a single ZA3 easily driving a pair of the Magnepan LRS+ speakers, and the little ZA3 never even broke a sweat. It was as described, and I would hope the new V3 Mono are better than the ZA3 in regards to sound. The ZA3 was still two dimensional vs the 3D I get from a Class A/B. I will be purchasing these mono blocks, these are just too cool not to. Again, thanks for the review and the time you put into this.

I'd like to see you review an affordable tube preamp that would mate well with these little monsters.

I'm reviewing the V3 stereo amp. So far it's great except for one thing, which is the input volume seems too low. I have to set the volume to 3/4, in order not to have my pre-amp past 3/4 as well. Other reviews mention the same thing. These new amps are an improvement over the TB10D. Because I have dual subs, I'm happy to see amps that have outputs.

Would like to see how these compare in audio fidelity to other top audio amps just to see where land and how they stack-up in the audiophile world.

Hi Matt, could you give some more feedback on your thoughts of the signal sensing feature? Did it activate even at low volumes or did quiet music not suffice to keep the amps on? Thanks!

Nice review. Curious--where can you pick up one of those clear/chrome component stands shown around the 3:21 mark?

Hi Matt, I was wondering if you were having any noise issue using the single power supply now that you have had it for a while? One reviewer commented on that and I thought it was just a fluke, but there’s a another recent reviewer that couldn’t review the sample because of the noisy power supply.. and they had to contact Fosi for replacement to finish the review.

I want, but want someone to make a preamp 2.1 with a crossover knob.

There is no mention about the price, so how much is it for each?

Just wanted to mention that Fosi say that they are confident that they will sort out the noise issues with the dual psu before launch and if they don't they will substitute two 48/5 psus. Also they have met the stretch goals and are offering free cables and a free Muses02 op amp. In addition their price for a Muses02 op amp, at £21 is considerably lower than in the UK. You will need 4 op amps, so if you order three with your V3 mono you are getting a very good deal.

Great review sir - "You might have to spend more than you'd expect to get the change you're hoping fior." Not necessarily, particularly, if you want an amp that does this, and sounds like this, and makes Taylor Swift sound like she's sitting on your lap 😀

It would be nice if they put the little clicks and notches in the volume.And the very least of sent her details for the basin travel

These look great, but I already get great sound on my office system with a Fosi V3 driving Sony SSCS5 speakers. More than enough power, no hiss, no distortion. I don't see a reason to upgrade to these new ones since the V3 is already so good.

Inductor locking very small. How hot is this when have 48 volt and 5A power

What is the device with the 2 analog meters in the video

I'm definitely entertaining grabbing these little kick ass amps...but I haven't seen them pushing like a 12" woofer where I can see real output . Unless they're only good for little speakers

Great amp and review/information. I do wonder how the long time durability is on these Texas circuits. Performance/price/durability?

The mini amps are great and can be integrated into a real neighborhood Problem

i have both 2 aymaa 07 max and 2 fois audio za3 amps, they have 2 different anfide NE5532 opamps but they are not the same fosi is more tiring, ayma minutes are not tiring, I think they use low quality opamps, the most beautiful is that you buy the original NE5532 from mouser or digikey, the sound is very nice, definitely the original is of better quality and does not tire your ear, and OPA2134 and LM4562, the opamps are very nice and I ordered muses 02, but they haven't arrived yet, so I haven't been able to test.

Has anyone an idea you get a good sound with the NE5532 (setting at 50%) how it changes with different OPs like a LME49720, OPA1612, MUSE or SparkOS ones. What is your experience? How much influence does it have. Does it become better than the NAD 2xx amplifiers?

I use fmods at 70hz [THX] hi pass and a 500watt or 1000watt sub amp and the monoblock s @ 48vdc 12 amp. O Lord they play loud.

excellent video, specially for someone like me who's designing a custom TPA3255 amplifier with PFFB and high quality components: in switching controllers like in a SMPS, feedback is utilized to stabilize the control loop and make it closed-loop instead of open-loop. My mentor in power electrics always tells me that there is no control in open-loop converters! So, Class-D amplifiers are a bit similar to switch mode power supplies (SMPS) but the conversion from analog to digital introduces modulation errors and so forth, plus if you desire that the input is faithful to the output with some linear gain, the only way to achive this is to have a feedback loop on the outside the LC filter, thus PFFB, or Post Filter Feedback! What I'm trying to get is that PFFB is also a means of increasing this stability problems and can make a control system faster, but if bad components are used with non-linearities, you will see worse THD, which is a nightmare.

Are they Nippon KY series caps?

I've already seen two reviewers that had a noise issue with the 10A power supply. One of them advised against it right out, the other contacted Fosi and they are sending him another power splitter. I guess yours was not noisy?

I am wondering about those op-amps. To my mind they are part of a pre-amp stage. So this is still an integrated but no attenuator. It is always on full blast. I'd feel like I was daisy chaining using these with another pre-amp.

I have 2x ZA3 2x 48v PSU. Brand new unopened. Anyone think I should just keep or sell and get the new mono amps?

Can those be connected to a Wiim Pro Plus without a pre amp ? Will i be able to control the volume through the wiim?

I just bought a Fosi Audio V3 because it was the latest version and all. ~3 Months later, it has been obsoleted by the V3 Rev2, ZA3, and now these (though I really am not into mono amps). FFS! They are spitting out revisions of these things faster than the last two models can get in stock. The V3 Rev2 thing actually pissed me off because they fixed the "pre-out" to be on the volume control and they spit that one out like a week after I bought the original model 😡🤬.

The fact that Fosi made a mono amp, I highly suspect they will follow with a matching preamp.

So the big question and missing, How does it sound compared to Za3 mono and Aiyima07 Max in mono?

They can easily power 4ohm sub woofer (s)

Don't need a screen on these. Get a PecanPi streamer/dac/preamp with XLR outs.

It's reassuring that YT Reviewers such as Matt are beginning to shed their misconceptions about today's Class D "high-end" products from Asia sound quality....thank you Matt. But unfortunately there continues to be this misconception, by all YT Reviewers, about size...and because of these products compact size, and price point, they keep getting egregiously categorized as near-field and desktop "only" devices....which they are not! They can drive everything from Wilsons to Magnepans (2 ohms speakers) and not break a sweat. So...here is a simple explanation as to why these Class D amps are compact compared to larger Class A and A/B siblings. The TI TPA3255 based Class D amps from Fosi, Aiymia, Douk are what you call market disruptiors because they redefine accepted beliefs such as a "high-end" amplifiers must weigh over 100 lbs. and can heat your house, large enough to be used as a guest bed, and cost as much as the whole house to be good. People are also misguided in believing that size matter as it pertains to an amp's power delivery. That is only true for Class A and AB amplifiers because of their low efficiency. You see---they are big not because they are delivering so much power---it is because they are wasting it in the form of heat--not so with Class D, they are so efficient, over 95%, they barely get warm to the touch when delivering 100 watts of power. So you don't need the expensive large heatsinks or enclosures and you can make the amplifier much smaller for the same power delivery compared to Class A and AB. So these industry changing Class D products, are small, less expensive (for now), and produce high-end sound----they are truly state of the art. So give them a try on a pair of $50,000.00 loudspeakers and save the other $50,000.00 and take in a lot of concerts Sorry for the long post.

Never watched ur channel before, but since you mentioned u have some hi-end stuff ( just to clarify, been at this for 53+ years and have owned everything under the sun. Scales have fallen from my eyes last year when I dummied onto ASR!) what do you have that's even remotely close for the price (yes, waiting on mine from kickstarter, gotta have 'em gotta have ;em!!) and what are/is they/that. We don't have dog's ears, although that might be nice, so,trying to be objective

What is the power spec for 8 ohm driving 2 channels at 20hz-20khz which my current avr uses? I’m wondering whether this would be a good amp to relegate my avr to preamp duty only.

I’m new to this whole thing. Why is monoblock desirable?

Provide RMS power rating, not just peak power rating!

Nice review. What did you front end them with?

@MattCoykendall1 wow they are really stamping out so many products, feels like they release a new one weekly. Thanks for being an enjoyable and informative watch. I’ll say this … Fosi and Wiim are making the industry push the envelope just to keep up. 🙃

Um... what IS the price?

They are moving in the right direction but features, package, and price wise this is a pretty confusing product. With 150 + watts on tap this tiny form factor makes little sense, nobody needs this much power on their desk so it would make more sense to build a full sized component in dual mono configuration with the power supply built in. Also without a pre-amp to pair it with this a half baked product release, Fosi needs to settle down on these release and think these designs out more and just sit on something if they have to so they have a more complete product stack that makes sense. As it is right now we have three amps that are so close to the same thing difficult to differentiate them and now one you need to buy two of and turn to a third party to even use. The last problem here is price, sure you get a lot of clean power for the money but again you are going to need a pre-amp and DAC, or DAC that can function as a pre-amp which Fosi doesn't even offer but regardless you are going to be in $300+ minimum which is Yamaha S301 or Cambridge AXA35 territory and frankly I think I'd rather have either of those. Lastly the load dependency issue is way overblown. Yes, it should be addressed because technically its a "problem" but the likely hood of it being audible at all is pretty small let alone a major issue. If anything its amps based on the TI3255 and Infineon MA5332MS that ironically no post output filter to correct for load dependency that broke the mold (for me atleast) of having harsh unrealistic highs on previous more expensive class D which do not exhibit this load dependency "issue".

Why i need 10 items for system.. omg 😂

Having one PS for two amp is idiotic. That defeats the whole purpose of having mono blocks in the first place. It’s NOT mono blocks if the PS is shared!!!

It's maybe a good amp, but doesn't worth its price. Buying a TPA3255 amp with $140 is insane. TPA3255 module only worth $15. Then the case worths over $100? What so called PFFB is just a few caps and resistors suggested in the TI datasheet.

I've had multiple bad experiences with SMSL product reliability, have read of issues with Topping reliability, and so lump Fosi in with those Chinese brands in terms of not trusting in its reliability..

Very bad solution 😂