Fosi Audio V3 Mono Amplifier Review

[Kayshot]

On the power supply subject, I read into the debacle over the 10a option so I just changed my pledge to the package with two amps and two 5a power supplies.
It runs the same price as two amps with one 10a supply. Only mentioning this in case some people think they are stuck with their original pick.

 

[EddNog]

On the power supply subject, I read into the debacle over the 10a option so I just changed my pledge to the package with two amps and two 5a power supplies.
It runs the same price as two amps with one 10a supply. Only mentioning this in case some people think they are stuck with their original pick.

For people who were one of the first 200, will they forfeit their 30% discount if they switch now? I imagine yes.

-Ed

 

[Kayshot]

For people who were one of the first 200, will they forfeit their 30% discount if they switch now? I imagine yes.

-Ed

I'd assume so, but the discount is still 25% (at least for me, not sure if that tracks with my original pledge-date).

5% of an already budget-option seems like it wouldn't be a deciding factor for most people here, but who knows!

 

[Negatywny]

this pro knobs look pretty interesting, could provide temporary solution...

PreSonus | Wherever sound takes you.

Studio One software, studio monitors, digital audio interfaces, mixers, microphones, preamps, pad controllers, control surfaces, and more.

www.presonus.com

this one with sub and headphones out (and blutooth) and pretty decent S/N 102dB - add 2-3 rca inputs and remote control and it would be almost perfect...

 

[MCH]

intersting.
Top: this ebay listing https://www.ebay.co.uk/itm/275540643117
Bottom: Guddu's review here in ASR:
most (all?) huntkey models, the three figures after the letters denote power in watts

have seen worse made though :

 

[Sokel]

intersting.
Top: this ebay listing https://www.ebay.co.uk/itm/275540643117
Bottom: Guddu's review here in ASR:
most (all?) huntkey models, the three figures after the letters denote power in watts

View attachment 366964

I think a simple calc is enough:

 

[spandy]

Seems like it's time for @Fosi Audio to chime in and clear this up. I hope there is a 10a variant of that same psu that they've elected rather than the 6.25A version shown here.

 

[Sokel]

Seems like it's time for @Fosi Audio to chime in and clear this up. I hope there is a 10a variant of that same psu that they've elected rather than the 6.25A version shown here.

Huntkey does not even list the one shown in their industrial adapters.
I hope it's a custom version,for the friends who choose this amp.

As is I would take two 5A ones (or two 10A or whatever they are) over the one listed for 10A.

 

[Psinet]

now that is an oxymoron!

Bomb-proof construction, Duratex coated, mobile usage, but high-end hifi componentry.

 

[GoDawgs]

Assuming he’s sticking with the iFi Zen, is there any reason to not just use RCA splitters to send the signal from the pre-amp to both the amps and subwoofer? That’s what I’ve always done with my pre-amps that don’t have dedicated subwoofer output.

I actually am not aware of a reason other than is there a potential voltage drop for each of the post-split outputs? If not then this works too.

-Ed

I've believe I'm going to try the Elac Sub 1010 subwoofer: 10"driver, 120W peak, 60W RMS, inputs: L/R/LFE/speaker level. I'll use my IFI Zen DAC/AMP (in variable mode for volume control), split off the RCA cords for the sub woofer from the rear balanced 4.4mm output from the Zen as Early Rejecter suggested and then use the two mono blocks to power my passive 6 ohm bookshelf speakers. (I hope...)

On the power supply subject, I read into the debacle over the 10a option so I just changed my pledge to the package with two amps and two 5a power supplies.
It runs the same price as two amps with one 10a supply. Only mentioning this in case some people think they are stuck with their original pick.

I did order the two 5amp power supplies after seeing a YouTube video where the reviewer claimed he heard some noise using the supplied 10amp power supply with the splitter cable for both mono amps. It was exactly the same price for two 5amp power supplies, I went for that, what I hope turns to be the safer decision. Thanks EddNog and Early Rejecter for your help! This forum is a grand find and a treasure trove of info. Some of us aren't as knowledgeable as others but, being just eye candy isn't ALL bad.

 

[Guddu]

The technical improvement is notable, but unless you have speakers with a particularly critical impedance curve, you will hardly hear a difference in everyday use.
If you don't hear any noise, if there's enough power, and if you don't perceive an altered frequency response with your A07, the gearbox isn't very useful.

And to add, normally you would use calibration on your avr in HT setup which should take care of any frequency or timing correction needed.

 

[Nahkarankaisija]

I have found a used Pro-Ject Pre Box DS2 Analog for 250€, I would pair this with the two Fosis and use my SMSL SU-6 DAC to connect it to my PC, the preamp would be used for volume control and the DAC would be set at 0db volume, in my mind I don't see any negatives to this setup except for perhaps a longer signal chain with 3 separates but it should be a reliable and easily upgradeable setup. Any thoughts? Main point would be the purely analogue volume control of the Pro-Ject.

 

[Negatywny]

no xlr, expensive but not fancy

 

[gwing]

Seems like it's time for @Fosi Audio to chime in and clear this up. I hope there is a 10a variant of that same psu that they've elected rather than the 6.25A version shown here.

Yes, I hope so to0 - but I'm going to stick with the 10/6.5A version anyway. I'm not likely to drive them hard enough for it to be a problem, and if that usage changes I'm happy to just get another 10A of some description.

 

[galego100]

One 48V/10A with the splitter cord is enough to power two units in full power ( theoretical 300W) ?

 

[Kayshot]

One 48V/10A with the splitter cord is enough to power two units in full power ( theoretical 300W) ?

To summarize, there is some concern that the power-supply claiming 10A only outputs 6.3A total, across two of these amps, when connected via splitter.
This stems from testing done by one reviewer, and people searching up the model number for this power supply. I haven't seen the video, but saw someone saying this lack of 10A led to some audible distortion when running two amps connected to one "10A" with the splitter.

We're patiently waiting for Fosi to chime in here, as they may be using some kind of true 10A revision of this power supply via the manufacturer.

 

[SMen]

To summarize, there is some concern that the power-supply claiming 10A only outputs 6.3A total, across two of these amps, when connected via splitter.
This stems from testing done by one reviewer, and people searching up the model number for this power supply. I haven't seen the video, but saw someone saying this lack of 10A led to some audible distortion when running two amps connected to one "10A" with the splitter.

We're patiently waiting for Fosi to chime in here, as they may be using some kind of true 10A revision of this power supply via the manufacturer.

Yes absolutely right. @Fosi Audio - my assumption is that this is "some kind of true 10A revision of this power supply via the manufacturer". I think it is a good idea to power both (in certain use cases) from one power supply - but not if miss-informed users with certain use cases find themselves having to buy a second one (unnecessarily).

The reviewer was linked to here. https://www.audiosciencereview.com/...o-v3-mono-amplifier-review.53474/post-1963060

 

[somebodyelse]

My assumption is it's rated for 6.3A continuous but 10A for short term peaks (hence the MAX), similar to the continuous/peak ratings for some of the Meanwell models. I looked for a datasheet to confirm, but couldn't find one.

 

[SMen]

My assumption is it's rated for 6.3A continuous but 10A for short term peaks (hence the MAX), similar to the continuous/peak ratings for some of the Meanwell models. I looked for a datasheet to confirm, but couldn't find one.

This is not up to us to justify or explain! (10A max vs 6.3A imprinted on the unit)

 

[mike70]

One 48V/10A with the splitter cord is enough to power two units in full power ( theoretical 300W) ?

If P = V x I ... with 48 volts and 10 amp, yes, theoretically you have 480 watts.

If you don't have 10 amp ... maybe not.