Fosi Audio V3 Mono Amplifier Review

[Deleted member 72219]

I turn all my gear on and off at least once a day using a wifi power socket. I just shout at Alexa to do it for me, no trigger interface required. If I had v3 Monos, I'd do the same with them.

That’s…smart.

*Badum-tisssssssss*

 

[Mort]

Mine pop when switched on from off and the power remains connected. There is No pop on auto while it remains powered. (Also have minor pop XLR to RCA).

Is there pop when you send power via smartswitch and it's already set on auto?

 

[Erikson]

I turn all my gear on and off at least once a day using a wifi power socket. I just shout at Alexa to do it for me, no trigger interface required. If I had v3 Monos, I'd do the same with them.

ocket. I just shout at Alexa to do it for me, no trigger interface required. If I had v3 Monos, I'd do the same with them.

I turn all my gear on and off at least once a day using a wifi power socket. I just shout at Alexa to do it for me, no trigger interface required. If I had v3 Monos, I'd do the same with them.

ok thanks. I can work with my Google Home but if i can find a trigger powerstrip it wil work realy smart, smile. I don’t know it is not bad to turn on the system on this way. I will use two 5a bricks.

 

[galego100]

I must have clouds above my head... Now @Fosi Audio on September 3 , send me , new package, to replace the first one from Kickstarter, which was detained by Spanish customs... Now since September 3 , the tracking shows no move , update, life, or something else!!

Since September 3, the track shows , "Your package is waiting to be picked up by the carrier" "Shipment information received" , still on China...

 

[ninetylol]

Shipping from China may take its time, I think they usually collect packages over few days which then all get shipped via ship.

 

[burkm]

@galego100
Did You contact Fosi Audio already, confronting them with that status message You got ?
Strange, that the new delivery is still at the factory.

Note: My experiences considering "delivery" are: Did You check with them, because if I remember faintly, they might have currently run out of V3 Monos and are waiting for the next charge of V3 Monos to be delivered to their premises (warehouse). This might take some time because of i.e. retooling for that known "phase inversion" issue...
Many companies "manage" shipments also: They get a delivery label online (data) as soon as they get "Your order" or the delivery is (re-)enabled but the item will then be physically delivered only as soon as it is "really" ready (or available) for delivery.
"Patience" might be asked for now (again)...

 

[galego100]

@galego100
Did You contact Fosi Audio already, confronting them with that status message You got ?
Strange, that the new delivery is still at the factory.
My experiences considering "delivery" are: Did You check with them, because if I remember faintly, they have run out of V3 Monos and are waiting for the next charge of V3 Monos to be delivered to their premises (warehouse). This might take some time because of i.e. retooling for that known "phase inversion" issue...
Many companies "manage" shipments also: They get a delivery label online as soon as they get "Your order" or the delivery is (re-)enabled but the item will be physically delivered only as soon as it is "really" ready (or available) for delivery...

I contact them , and Jocelyn and told me , on September 4, "
We have re-sent you the products, please check the tracking link below:"

After that , 2 days ago i contact them for some news , and no answer, nothing...

 

[burkm]

She probably did, what she was told, and read it of the screen and didn't tell You that there are no V3 Monos in the warehouse right now...

 

[Karlaka]

Dear friend Galego. You're really out of luck. But anyway, just as I imagined, FOSI is responding. The mere fact of sending you a new pair of amplifiers speaks highly of them. when I consider that they have no responsibility for the bureaucracy of Spanish customs and its possible obstacles. I sincerely hope you can be reunited with your equipment soon.
Greetings!

 

[kingkoolkris]

Mine arrived yesterday (Double pack with 10A PSU) and they're working flawlessly. They're getting pretty warm but nothing concerning I'd think.
They're hooked up to my Onkyo TX-RZ730 RCA preouts.

 

[Brian Hall]

Mine arrived yesterday (Double pack with 10A PSU) and they're working flawlessly. They're getting pretty warm but nothing concerning I'd think.

Winter is coming. The extra warmth might be nice.

 

[Mort]

I love them but decided to return mine. Pops, heat primarily are my concerns.

Bigger, I feel it's just not the right price point (for me.) They might be the worst of both worlds, neither cheap nor refined.

For $200 more I can get a flawless buckeye 2ch nc250mp (which I'm doing) and not really think about it again. For $100 less I can get a ZA3 or similar and be good enough. The Fosi monos are an excluded middle for me.

It's a fun device though. I still want to like the V3 mono.

 

[Bene]

yeah. just bought the Za3 and it has a very good cooling... it's just very little warm, it would have been good to have used the za3 case for better cooling.

 

[strawberry644]

i tried to read over most of the pages here and saw some discussion of the opamps in this Fosi v3 Mono not sure if this has been discussed.

I was wondering how important the op amp is closest to the front panel and if it would make RCA input sound different? i currently have my Fosi v3 Mono's (48v 5A unit. OPA1656 in slot 2 or middle for each) being fed from the RCA of FiiO K7 DAC and was wondering if all 3 matching opamps might sound different since I'm not using XLR input?

either way I'm still really happy with the audio even compared to my Fosi v3 48v stereo i was using before that.

 

[Freezak]

Has anyone found an effective way to turn the AC Infnity fans on automatically when the temperature of these monos goes up? I know there's the AC Infinity Controller 1 available but it's ridiculously expensive in Europe compared to AC Infinity fans, perhaps some cheaper chinese solution that i can't find on AliExpress? Thanks

 

[Sokel]

Has anyone found an effective way to turn the AC Infnity fans on automatically when the temperature of these monos goes up? I know there's the AC Infinity Controller 1 available but it's ridiculously expensive in Europe compared to AC Infinity fans, perhaps some cheaper chinese solution that i can't find on AliExpress? Thanks

Posted again in this thread,it may work on not for you and it will be kind of a Frankenstein solution but do your research:

Fosi v3 Mono - User Impressions | Owner's Thread

Maybe it’s OK but for a few dollars I was able to add some finned heat sinks on top using some thermo tape. Haha, looks predatorily, like mohawk gremlin. Fosi should add some leds to it and sell as gamers edition ;)

www.audiosciencereview.com

 

[Freezak]

Posted again in this thread,it may work on not for you and it will be kind of a Frankenstein solution but do your research:

Fosi v3 Mono - User Impressions | Owner's Thread

Maybe it’s OK but for a few dollars I was able to add some finned heat sinks on top using some thermo tape. Haha, looks predatorily, like mohawk gremlin. Fosi should add some leds to it and sell as gamers edition ;)

www.audiosciencereview.com

Thanks for your quick reply, this sounds like the perfect solution, i'm gonna do further research into this.

 

[Killingbeans]

I was wondering how important the op amp is closest to the front panel and if it would make RCA input sound different? i currently have my Fosi v3 Mono's (48v 5A unit. OPA1656 in slot 2 or middle for each) being fed from the RCA of FiiO K7 DAC and was wondering if all 3 matching opamps might sound different since I'm not using XLR input?

First we have to define "different". Is it "performing better" or "sounding better to my taste"? And in the former case, what's your taste?

If you randomly swap in op-amps with different operating parameters, you'd might hit a combo that gives an instability with tons of distortion. Maybe that will be pleasing to you. Most likely it won't be bad enough to actually be audible. You'd also be highly at risk of getting a placebo effect going.

Either way, doing these kind of swaps, without verification through measurements and sensible judgement of the results, is a frivolous exercise, IMO.

 

[SMen]

i tried to read over most of the pages here and saw some discussion of the opamps in this Fosi v3 Mono not sure if this has been discussed.

I was wondering how important the op amp is closest to the front panel and if it would make RCA input sound different? i currently have my Fosi v3 Mono's (48v 5A unit. OPA1656 in slot 2 or middle for each) being fed from the RCA of FiiO K7 DAC and was wondering if all 3 matching opamps might sound different since I'm not using XLR input?

either way I'm still really happy with the audio even compared to my Fosi v3 48v stereo i was using before that.

This might be better over on the Fosi v3 mono user impressions thread . Your RCA input converts to balanced and then progress through the circuit in the same way as the balanced input - so matching your position 3 op amp with your position 2 according to Fosi should bring a change...

Note my italics! I haven't had time but I'm going to write a post on this on the user impressions. Personally, I would not expect an improvement with all OPA1656! But if you already have another pair of OPA1656 them give it a go, and then ask yourself if you really want to keep them there!

The supplied NE5532 in combination with the circuit designed give a nice full natural sound (imso).

 

[burkm]

But nontheless Op amp rolling is is still supported / favored by the manufacturer, because he might sell you some additional (expensive ?) OP amps (to the ones already installed in the power amp) which he makes additional money on them
The arguments against are weighting strongly but "taste" and opinion might favor it the other way. I am still undecided, if OP amp changes are doing any good to SQ