Fosi Audio V3 Amplifier Review

[saberger0357]

In regards to power output I bought an Fosi Audio 48v 5a and also have Aiyimas 36v 5a. They both push the same volume out but the V3 does get a little hotter with the 48v. There is a slight difference in sound quality between the two power supplies with the Fosi giving a slightly smoother sound.

I just received the 48v supply from Fosi today, and have been using it first with the TB10D. Fairly substantial positive difference to my ears from Ayima's 36v supply. The amp displayed a bit of graininess and almost seemed a little strained with the latter, but the 48 things seem more effortless, and there's a richness to the quality of the sound that I didn't detect with the lower supply.

Looking forward to trying it with the V3 later.

 

[Mordor]

Which bookshelf speakers close in price to ELAC Debut B6.2 would be the best for this amplifier? I'll be pairing it with S.M.S.L SU-1 DAC. I live in an apartment too, subwoofer is not an option - so preferably i'd like something with a not-so-bad bass extension, something also that's the best as an all-rounder, as they'd be used for music, movies and sometimes games as well. I prefer neutral, HD560s-like sound signature but obviously it's not a necessity, as rooms and room treatment options are not always the same in every case. Thanks!

I own those speakers. I do not have a reference to tell you if they are great with Fosi or not. My previous speakers are more than 30 years...

Something i notice, maybe is my imagination, even with 48V powersource, looks that the Fosi is given ....maybe 50wts? Shouldn`t they kick more?
Or maybe the DAC i use is not sending a strong signal to the Fosi? Need more time to try, maybe connecting directly my Marantz CD 50 to this AMP....

Apart that, great sound!

 

[saberger0357]

I own those speakers. I do not have a reference to tell you if they are great with Fosi or not. My previous speakers are more than 30 years...

Something i notice, maybe is my imagination, even with 48V powersource, looks that the Fosi is given ....maybe 50wts? Shouldn`t they kick more?
Or maybe the DAC i use is not sending a strong signal to the Fosi? Need more time to try, maybe connecting directly my Marantz CD 50 to this AMP....

Apart that, great sound!

Those speakers are 6 ohms. Amir's review indicated 89 watts at 8 ohms with the 48v, so you definitely are getting more then 50. Is the DAC gain up all the way. And yeah, connecting the CD direct to amp should give a good test.

I'm using mine with difficult to drive 4 ohm speakers and the power is plentiful .

 

[gasolin75]

I have a fosi audio BT20A with a slightly bigger psu than stock and it's also pretty power full with my dynaudio emit m10

I don't think i have more than 2x50 watt in 8 ohm or just shy of 2x 100 watt in 4 ohm.

I wouldn't mind a real power full and cheap amp with real 2x100 watt in 8 ohm (less than 1% thd) without having to buy a a psu as expesnive as the amp + stock psu

Just for us who wants it loud or want min 2x100 watt in 8 ohm for low sensitivity speakers or just for high dynamic headroom without needing 2x200 watt in 8 ohm

 

[saberger0357]

I have no idea what type of music you listen to, the size of space or how "loud" is loud for you. I know in my medium space, it takes a few watts more or less to get it over 80db. I know about headroom, but I would think in circumstances other then listening is a very large space with difficult to drive speakers at concert levels, this amp should work for most applications. And for the price, that's a pretty good deal IMO.

 

[Schlippwhip68]

I just received the 48v supply from Fosi today, and have been using it first with the TB10D. Fairly substantial positive difference to my ears from Ayima's 36v supply. The amp displayed a bit of graininess and almost seemed a little strained with the latter, but the 48 things seem more effortless, and there's a richness to the quality of the sound that I didn't detect with the lower supply.

Looking forward to trying it with the V3 later.

Yes, that is pretty much what I found with the Fosi compared to the Aiyima. The Aiyima conveyed a little more brightness, sharper vocals while the Fosi was more smooth and as you have said, a little richer.

 

[saberger0357]

Yes, that is pretty much what I found with the Fosi compared to the Aiyima. The Aiyima conveyed a little more brightness, sharper vocals while the Fosi was more smooth and as you have said, a little richer.

You're referring to the PSU's or the amps? I was specifically commenting on using the Ayima 36V supply vs. the Fosi 48 with the TB10D. I sure wish the new Ayima A04 that I just received could accommodate a 48V supply, but seems 36V is it's limit.

 

[Schlippwhip68]

You're referring to the PSU's or the amps? I was specifically commenting on using the Ayima 36V supply vs. the Fosi 48 with the TB10D. I sure wish the new Ayima A04 that I just received could accommodate a 48V supply, but seems 36V is it's limit.

I’m referring to the tonality of the amplifier when using either one of the power supplies .There is an obvious difference. I never found an increase in volume between either one, but both were an improvement over the 32v. I did find the amp ran hotter with the Fosi 48v than with the Aiyima 36v.

 

[Schlippwhip68]

I have a fosi audio BT20A with a slightly bigger psu than stock and it's also pretty power full with my dynaudio emit m10

I don't think i have more than 2x50 watt in 8 ohm or just shy of 2x 100 watt in 4 ohm.

I wouldn't mind a real power full and cheap amp with real 2x100 watt in 8 ohm (less than 1% thd) without having to buy a a psu as expesnive as the amp + stock psu

Just for us who wants it loud or want min 2x100 watt in 8 ohm for low sensitivity speakers or just for high dynamic headroom without needing 2x200 watt in 8 ohm

The BRZHIFI 3255XLR will provide that kind of power. Mine got even louder after a few days of burn in. Great amp with plenty of muscle.

 

[BeQuietZen]

The BRZHIFI 3255XLR will provide that kind of power. Mine got even louder after an few days of burn in. Great amp with plenty of muscle.

Fascinating.
And what measuring equipment you used to find difference in power output 'after an few days of burn in'?
I hope you have the numbers before and after burn in to enlighten us.

 

[Fosi Audio]

@Fosi Audio I read on thread for your new "tube P3 preamp" that you are going to update the V3 to have the preamp out adjusted according to the volume. Do you know when that will be part of the "new" V3? I use a subwoofer and that is a requirement for me. I am waiting for this issue to be resolve before pulling the trigger.

Thanks,

Hi friend, the new version may be available in October.

 

[gasolin75]

I have a fosi audio BT20A awith a slightly bigger psu than stock and it's also pretty power full with my dynaudio emit m10

I don't think i have more than 2x50 watt in 8 ohm or just shy of 2x 100 watt in 4 ohm.

I wouldn't mind a real power full samm and cheap amp with real 2x100 watt in 8 ohm without having to buy a a psu as expesnive as the amp + stock psu

Just for us who wants it loud or want min 2x100 watt in 8 ohm for low sensitivity speakers or just for high dynamic headroom without wanting 2x200 watt in 8 ohm

Update i tried my fosi audio BTA20A and it forgot about it, tone controls was adjusted the sound is not less bright still with god bass and power is high but 2x100 watt in 8 ohm mabye in 4 ohm at 10% thd

 

[Mordor]

Well, i was alone at home and did opportunity to push the amp to max....i think the power is there, and my fist impressions were wrong.

I`m just adapting from my old Class D 30 euros amp and Pioneer......

No problems here.

Glad, also to push all way up, and no distortion....my old Pionner, at 11:30 already starts to distorted sound............lol

 

[gasolin75]

many normal sized amp with an analog volume does reach max volume before 12 o'clock, especially when using a cdplayer

 

[mike70]

I think V3 stated a logarithmic volume, so ... that behavior is totally normal. You can't see it as a standard analog volume pot.

 

[maudio]

Short repot on diff audiophonics/ebay 36V/48V SPS:
I got 1st the 36V SPS cos i didnt want the Fosi too hot, but somehow with 36V/10A when listening at lower levels it sounded a bit flat. Got the 48V/7A PSU and boom - sound is somehow smoother and more "fleshed out", which correlates with Amir's test. So not going back. This is all with Sparkos opamps.

WIth 48V Fosi gets someething between warm and hot. I even got heatsinks and put them on the sides of Fosi V3, not sure if they help much.
So wIth Sparkos and audiophonics 48V SPS Fosi V3 is fantastic.

One wish to @Fosi Audio - Sparkos should be easier to insert, specially now that you became official distributor - at least without using risers and/or bending caps there is enough place just move them caps a bit. But that's really now nit-picking.

 

[Mordor]

I confirm with the 48v it gets warm/hot, specially on this weather.
My solution:
Adapt a PC fan to a cable USB and connected it to a 5V power source, on back.
Now it gets cool and the DAC next to it, also, even it doesn`t need.

 

[T&T]

Few days ago, I move the Sparkos labs to my DAC them I place 2 lme49860 on V3 excellent sound...but today I started with OPA627 dual, Muses 02, opa1656, opa2604, opa4458bm lm49860...Surprise the power hungry lm4562 sounds better a not so loved opamps, so 2 Sparkos Lab and 1 Muses02 to my Dac and lm4562 to Fosi v3 with 48v... amazing

 

[cyclo]

On 48V, the Fosi V3 can get to 40C on my setup... To cool them down to ambient temps even when driven hard, I use a USB powered AC Infinity 120mm fan blowing sideways. Fan is available in different sizes (up to 140mm) at Amazon. At the lowest (quietest) fan setting which is barely audible, it is enough to cool the three fosi v3s to ambient temps.

 

[gasolin75]

Where do you get a laptop 48v 10a power adapter ?