Fosi ZA3 TPA3255 Mono/Stereo Switchable Amplifier, and vs Aiyima A07 Max

[Guddu]

When it's off? That almost completely defeats the purpose of the 12V trigger...

My mistake, I thought you asked for idle.
When its off, no power is drawn or at least smart plug isn’t recognizing it good enough to report.

 

[G-Can]

Many amps have no volume knob at all. They are pure amplifiers, and many people don’t stress over this problem at all with those.

For negative compensation, if the S/N ratio is reduced it’s not a big deal in my opinion, especially if these little classD’s are powering the surround speakers, it is not like we are talking for critical 2 channel stereo music listening.

If running too much positive compensation then I fully agree that it will require more powerful amp. But I think it is quite odd for someone to even consider these little amps if their speaker distance is that big and their speakers so inefficient that they need more than 100watts in the first place. It’s not a problem most people will face. Those with exceptional criteria’s will/should never even stop to look at these amps in the first place.

I wish I understood what you just wrote, Im just a noob with these things.

what Im now thinking, if I went with th elogic of putting Fosi amp to full volume, what happens when I start audyseyy calibration and that high pitch noise it shoots at speakers. It will blow these ceiling speakers to dust and my ears at it.

 

[K.Kevin]

I wish I understood what you just wrote, Im just a noob with these things.

what Im now thinking, if I went with th elogic of putting Fosi amp to full volume, what happens when I start audyseyy calibration and that high pitch noise it shoots at speakers. It will blow these ceiling speakers to dust and my ears at it.

Audyssey test tones are intended to be 75db signals.
Obviously your external amp and speaker sensitivity and distance will determine what it actually outputs during those test tones, but it’s not going to be wildly higher than 75db, because the Audyssey isn’t feeding your external amp a concerningly high voltage signal.

If you don’t understand that, just understand I don’t really think you should be paranoid at the test tones causing your speakers to blow up. It will likely be fine.

If it’s too loud for your ears, leave the room while they’re playing.

How far away are the speakers you are trying to power with these amps? What is their speaker sensitivity?

 

[G-Can]

Audyssey test tones are intended to be 75db signals.
Obviously your external amp and speaker sensitivity and distance will determine what it actually outputs during those test tones, but it’s not going to be wildly higher than 75db, because the Audyssey isn’t feeding your external amp a concerningly high voltage signal.

If you don’t understand that, just understand I don’t really think you should be paranoid at the test tones causing your speakers to blow up. It will likely be fine.

If it’s too loud for your ears, leave the room while they’re playing.

How far away are the speakers you are trying to power with these amps? What is their speaker sensitivity?

far away as in distance from the listener? Above my head diagonally, roughly 6 feet, 4 of them

 

[K.Kevin]

far away as in distance from the listener? Above my head diagonally, roughly 6 feet, 4 of them

You have nothing to worry about then.

In addition, you won’t need a more powerful amp. Turn your volume knob to the max, and then you can check how much Audyssey decreases the output after the calibrations are done.

 

[grogi.giant]

Many amps have no volume knob at all. They are pure amplifiers, and many people don’t stress over this problem at all with those.

I know. That clearly shows that often it is not the objective measurement that is important for people

I personally would not consider a power amp unless I can feed it over balanced interconnect or run it regularly close to maximum power.

For negative compensation, if the S/N ratio is reduced it’s not a big deal in my opinion, especially if these little classD’s are powering the surround speakers, it is not like we are talking for critical 2 channel stereo music listening.

Agreed. Surround or ceiling speakers only provide positional hinting. In Home Theatre environemnt the heavy lifting is done by the center and subs.

 

[Bruce Morgen]

the rca xlr switch should be just a relay right? so how can it not switch when you ask it to?

Relays are notorious failure points in low-level audio circuits. Omron is a solid Japanese brand, but not immune to the occasional defect.

the vol. knob is that same kind if cam based pot and so how can it not fire up if the power circuit is not ON THE CAM (so to speak)

unless there's some microprocessor control underneath? no?

Yeah definitely some digital logic involved -- my old 2.1 TPA3116 chip amp used that approach to enable its power button to double as an input selector. One holds the button down for a few seconds to turn it on or off, but a short press just changes the input between bluetooth, 2xRCA, and 3.5mm TRS aka "aux."

 

[Bruce Morgen]

In Home Theatre environemnt the heavy lifting is done by the center and subs.

I dunno about that -- my main L+R speakers move an awful lot of air when I watch an occasional action movie, so I'd include them on the "heavy lifting" team. I agree that the surround/ambience role is much less demanding -- that's why even the lowly Aiyima A07 is more than adequate for that job here, so there's no reason to consider any of the newer/larger/pricier amps even if they're measurably improved.

 

[Meloman]

As we can see Fosi delayed sales of ZA3.

 

[JimBean]

As we can see Fosi delayed sales of ZA3.

I'm okay with that, as long as it's to make sure they're manufacturing a good product. Kind of tempted to buy two of these for use as monoblocks. Eventually, after reviews are in.

 

[ninetylol]

As we can see Fosi delayed sales of ZA3.

What Do you mean? Problems occured? You can buy them in germany right now.

 

[grogi.giant]

I got email from fosi today that it was just released.

 

[Barry_Sound]

In mono mode, do you have two separate volume controls for left and right?

 

[vicenzo_del_paris]

I got email from fosi today that it was just released.

Released for sale by retailers.
It is already in stocks in retailers.
I ordered it yesterday at audiophonics and will receive it Friday.

 

[Meloman]

Released for sale by retailers.
It is already in stocks in retailers.
I ordered it yesterday at audiophonics and will receive it Friday.

But on site was 7 days, also see its starts

 

[G-Can]

Ok, it's showing on amazon.ca, but I don't see how this can be worth almost double then V3

 

[K.Kevin]

Ok, it's showing on amazon.ca, but I don't see how this can be worth almost double then V3

It’s not almost double though, because the price includes the 48v psu.

The V3+32v standard package and buying an additional 48v psu separately on Amazon it’s more practical to just buy the Za3

By my calculations, the lowest price V3+48v package shipped from china is only about 35 dollars (usd) cheaper than the ZA3 after the 20% off promo code. Less than 50% higher price, as opposed to double the price.

 

[G-Can]

It’s not almost double though, because the price includes the 48v psu.

The V3+32v standard package and buying an additional 48v psu separately on Amazon it’s more practical to just buy the Za3

By my calculations, the lowest price V3+48v package shipped from china is only about 35 dollars (usd) cheaper than the ZA3 after the 20% off promo code. Less than 50% higher price, as opposed to double the price.

Where is 20% promo code?

 

[G-Can]

and its not on Amazon.ca anymore

 

[Guddu]

Seems like ZA3 are selling super fast, congrats @Fosi Audio