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Bricks List: 36V & 48V Power Supplies (for Fosi, Aiyima etc.)

Zuiko

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Here's a preliminary list of 36V and 48V (brick) power supplies:

48V:
Aiyima / Douk Audio - 48V 5.2A (249.6W) - Model: FJ-SW202948005200
Aiyima - 48V 5A - Model: 4805000
Fosi Audio - 48V 5A GaN (240W) - Model: FJ-GN224048005000
Fosi Audio - 48V 5A - Model: JYH23Z-4800500-BF

36V:
Aiyima - 36V 6A 216W - Mode: MXD-3606000
Aiyima - 36V 6A - Mode: SW202732005000D
Nobsound / Douk Audio - 36V 5A (180W) - Model: NS-03G-18036

Welcomed feedback:
- Noise: Are the speakers silent when nothing is playing?
- Heat: on both the amplifier and the brick?
- Power: Impact on sound?
- Accuracy: Do the power supplies output what they promise?

36v48v_powersupplies.jpg


Background: I've been researching the Fosi Audio V3: Seems the 32V lacks a bit of power with power hungry speakers, and the 48V is pricey and raises the Amp's heat. 36V options may be a nice middle ground? Turns out there are quite a few options, and figured a dedicated post of the list may be useful.
 

NoMoFoNo

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FWIW I own the Fosi V3 with 48V/5a brick. When playing at low and moderate levels the brick stays cool to the touch and the V3 is pleasantly warm on the top of the amp, not as warm as most other amps I've owned. Re noise, if I put my ear right next to tweeters in my floor standers I can hear faint hiss, which becomes silence about three feet away.
 
OP
Z

Zuiko

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One of the power supplies is Fosi Audi 48V 5A GaN:
It is US$30 more than the regular Fosi Audio 48V 5A which is shipped with the V3.

Would be great to hear feedback from users who compared the 48V GaN vs 48V standard!

Articles re of GaN technology in audio:
- Gallium Nitride Audio Amplifiers: The Latest Technology in Audio Power Amplification
- Consumer Electronics GaN Application: Class-D Audio.
- Future Audiophile: What The Hell Is a GaN (Gallium Nitride) Amp and Why Is It Changing the Way Audiophiles Now See Power Amps?
- Peachtree Audio: All GaN Amps Are Not The Same
These features are NOT IMPORTANT to achieve the best sound quality in a GaN-FET power amplifier: A GaN based power supply....
- Infenion Semiconductors: Why GaN is the future for Class D (PDF)
- Technics uses GaN in their newer top of the line amplifiers SU-G700M2 / SU-R1000:
Seeking further improvement, the new SU-G700M2 incorporates the following technologies:
An Advanced Speed Silent Power Supply (AS²PS), incorporating “fast” semiconductor parts such as GaN (Gallium-Nitride) FETs and Silicium Carbide (SiC) Diodes for a much more reactive, efficient supply of current to the power stage for higher drivability of speakers. This approach leans on the power supply of the SU-R1000 reference amplifier...
- Audioxpress: GaN Technology in Audio Power Amplification
- 2016 Thesis: A Comparison between GaN and Silicon Based Class D Audio Power Amplifiers with Pulse Density Modulation (PDF)
 
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Guddu

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One of the power supplies is Fosi Audi 48V 5A GaN:
It is US$30 more than the regular Fosi Audio 48V 5A which is shipped with the V3.

Articles re GaN technology in audio:
- Gallium Nitride Audio Amplifiers: The Latest Technology in Audio Power Amplification
- Consumer Electronics GaN Application: Class-D Audio.
- What The Hell Is a GaN (Gallium Nitride) Amp and Why Is It Changing the Way Audiophiles Now See Power Amps?
- Technics uses GaN in their newer top of the line amplifiers SU-G700M2 / SU-R1000:


Would be great to hear feedback from users who compared the 48V GaN vs standard!
GAN based products are expensive in general, I have 100W GAN PSU which I used with Aiyima A07 pro but not for any improvements or something.
 

TonyJZX

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but does GaN run cooler or better in any way???

my quick 5 sec googling says the standard 48v 5a non GaN is a $60 affair while the GaN model is about $95

is it worth 50% more?

i would also like if people could attach a price to each unit for comparisons sake?
 

somebodyelse

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Like I said, should be a bit more efficient. The usual use is in mobile chargers of some sort (phone, laptop) so they can make them smaller while keeping a similar temperature.
 

Guddu

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Like I said, should be a bit more efficient. The usual use is in mobile chargers of some sort (phone, laptop) so they can make them smaller while keeping a similar temperature.
My laptop GAN charger (usb c 60W) runs hotter than original psu, but GAN is 50% in size and easy to carry for me.
 

TurtlePaul

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The most important thing would be power tests - the Fosi 48V 5A can do 160W x 2 so it is clearly not a 240 watt unit. There are testers for this. It would also be most accurate to use a scope to test the voltage ripple rather than listening to an amp.

The noise and heat qualitative opinions are much too subjective: how quiet can you hear in your environment? What amp are you using (Fosi V3 vs BT20 vs. Aiyama 07 vs. 08 pro)? Different amps can have different power supply rejection ratios and different self-generated noise levels. Inputs disconnected from the source? How sensitive and what impedance are the speakers? How hot is hot for the amp and power brick?
 
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Idrago

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Hello, I'm at the beginning of this site, constructive remarks and debates by connoisseurs and passionate about electronic products. Regarding the power supply, I personally tested the PSP on Fosi V3 and BT20A PRO, with opa Muses02 and sparkos SS3602 respectively, tested when powered with:
Fosi Audio - 48V 5A - Model: JYH23Z-4800500-has stability and performance, good power.
Fosi Audio - 32V 5A - Model: SW202732005000D- ok, fidelity in hearing, low power.
Aiyima 36V 6A - Model: FJ-SW21283606000D- cheap construction, lower quality, lack of filter on the DC cable, Aiyima forcibly replaces the delivery to customers without prior approval or presentation through the offer, at the same price instead of the very good and already established model MXD-3606000 , I have a question marks, possibly their lack of correctness in the future.
MXD-3606000 is optimal from what I have tested so far!
 

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Guddu

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Hello, I'm at the beginning of this site, constructive remarks and debates by connoisseurs and passionate about electronic products. Regarding the power supply, I personally tested the PSP on Fosi V3 and BT20A PRO, with opa Muses02 and sparkos SS3602 respectively, tested when powered with:
Fosi Audio - 48V 5A - Model: JYH23Z-4800500-has stability and performance, good power.
Fosi Audio - 32V 5A - Model: SW202732005000D- ok, fidelity in hearing, low power.
Aiyima 36V 6A - Model: FJ-SW21283606000D- cheap construction, lower quality, lack of filter on the DC cable, Aiyima forcibly replaces the delivery to customers without prior approval or presentation through the offer, at the same price instead of the very good and already established model MXD-3606000 , I have a question marks, possibly their lack of correctness in the future.
MXD-3606000 is optimal from what I have tested so far!

I received FJ-SW21283606000D with A07 Max yesterday, its compact in size than other MXD-3606000 which came with A07 Pro.
I am wondering what makes you say that FJ-SW21283606000D is lower quality?
About the filter on DC cable end, or Choke/Ferrite Core, that did not make any difference at all when I switches PSU to test. I tried using both PSU with A07 Max because I was also doubting smaller PSU size but it did not make any difference.
I have the PSU placed with many other power cables which are running AVR, DAC, subwoofer, etc. and also speaker cables. Idea of Ferrite Core would be prevent any kind of interference but I found none with new PSU. But having it has no harms, even if having has no benefits.
One difference between both Aiyima power supplies is that older one has 18 AWG mentioned on cable while new one has 20 AWG, would have preferred 16 or 18 AWG cable PSU but it is what it is.

On the other hand, I don't think Fosi's 48v 5a PSU has any Ferrite Core on it however their GAN PSU has one. Don't know about cable AWG.
 

Idrago

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I received FJ-SW21283606000D with A07 Max yesterday, its compact in size than other MXD-3606000 which came with A07 Pro.
I am wondering what makes you say that FJ-SW21283606000D is lower quality?
About the filter on DC cable end, or Choke/Ferrite Core, that did not make any difference at all when I switches PSU to test. I tried using both PSU with A07 Max because I was also doubting smaller PSU size but it did not make any difference.
I have the PSU placed with many other power cables which are running AVR, DAC, subwoofer, etc. and also speaker cables. Idea of Ferrite Core would be prevent any kind of interference but I found none with new PSU. But having it has no harms, even if having has no benefits.
One difference between both Aiyima power supplies is that older one has 18 AWG mentioned on cable while new one has 20 AWG, would have preferred 16 or 18 AWG cable PSU but it is what it is.

On the other hand, I don't think Fosi's 48v 5a PSU has any Ferrite Core on it however their GAN PSU has one. Don't know about cable AWG.
Thank you, your analysis is correct to the point, tested both 36V, 6A PSUs, I prefer the MXD 3606000, for long-term operation it is more stable, it doesn't give misses, the cables are different, I checked from the beginning, regarding the filter, it is an extra respect for the manufacturer , personally I have all the power supply stabilized and with filters. I want to ask you, why didn't you choose the A07 MAX option + the 48V 5A power supply Model: FJ-GN224048005000, a tempting GaN power supply to test immediately, at a dumping price of US$ 30-35, almost three times lower compared to the same identical model sold by Fosi Audio? The difference compared to 36V 6A would be under ten US$. The GaN source from Aiyima has been on pre-sale for two weeks, interestingly they have not crowded, they only have 12 mentioned orders out of 500 pieces initially offered, probably only five buyers, 495 pieces available!
 

Guddu

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I want to ask you, why didn't you choose the A07 MAX option + the 48V 5A power supply Model: FJ-GN224048005000, a tempting GaN power supply to test immediately, at a dumping price of US$ 30-35, almost three times lower compared to the same identical model sold by Fosi Audio? The difference compared to 36V 6A would be under ten US$. The GaN source from Aiyima has been on pre-sale for two weeks, interestingly they have not crowded, they only have 12 mentioned orders out of 500 pieces initially offered, probably only five buyers, 495 pieces available!

I normally order stuff on Amazon, and it only had 1 option. I would have surely ordered 48v option if available.


The GaN source from Aiyima has been on pre-sale for two weeks, interestingly they have not crowded, they only have 12 mentioned orders out of 500 pieces initially offered, probably only five buyers, 495 pieces available!

Thanks for sending over the link, I am seeing it first time.
But I wonder how do you know it's been using GAN?

I will probably order it when it becomes available on Amazon US.
 

Idrago

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Thank you, again your answer is to the point, personally I tend to measure two, three times when I want to cut once, because it is Aiyima, 48V 5A, the picture and the model correspond identically to the Fosi, GaN model, being Aiyima I am very careful with the promotion of their products, the three times lower price indicates that maybe it is too good to be true, or is the Aiyima price the real one? Time will clarify these aspects!
S5e653f40e9104816975814a89108d308g.jpg
 

Guddu

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Thank you, again your answer is to the point, personally I tend to measure two, three times when I want to cut once, because it is Aiyima, 48V 5A, the picture and the model correspond identically to the Fosi, GaN model, being Aiyima I am very careful with the promotion of their products, the three times lower price indicates that maybe it is too good to be true, or is the Aiyima price the real one? Time will clarify these aspects!
S5e653f40e9104816975814a89108d308g.jpg

Both, Fosi and Aiyima's these PSU's are 3rd party sourced, seems like manufactured by Shenzhen Fujia.
Although these one's might not be mentioned on their website, probably because bulk manufactured for B2B but their product serial might be an indication.
GNxxxxxx >> this might actually be using GAN tech. Also the PSU look quite slim and probably is partially or fully GAN based.

I will try and find out more, but you probably saved many people some money by pointing this one out :).
 

Idrago

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Kindley reminder! We are here to grow, learn and support each other, together, we have followed the technical evolution of the GaN adapter, at several companies for Laptops, filming and photography equipment, the stability is very good, I am at the beginning, maybe I talk a lot, honesty is necessary in ASR specialists, a dedicated site! Now, I think that the indicated producer is the same, in fact, it is an image shot Aiyima, the competition between them develops and creates progress!
 

pseudoid

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The most important thing would be power tests - the Fosi 48V 5A can do 160W x 2 so it is clearly not a 240 watt unit. There are testers for this. It would also be most accurate to use a scope to test the voltage ripple rather than listening to an amp.

The noise and heat qualitative opinions are much too subjective: how quiet can you hear in your environment? What amp are you using (Fosi V3 vs BT20 vs. Aiyama 07 vs. 08 pro)? Different amps can have different power supply rejection ratios and different self-generated noise levels. Inputs disconnected from the source? How sensitive and what impedance are the speakers? How hot is hot for the amp and power brick?
^Nice^
I am thinking that 'we' maybe able to coax @amirm to test some of these external AC-to-DC power sources for noise and load stability.
You ask him first!:D

I prefer DIY'g my own LinearPowerSupplies (LPS), after assessing the DC output noise specifications that are verifiable and if the DC load-hardware is worth my troubles.
 

TheWalkman

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I'm running the Fosi V3 from a Meanwell GSM220B48-R7B. According to specs, it's putting out 220 Watts @ 48V with 94.5% efficiency.


Though I haven't really tested it, I've read Mean Well makes a quality product. I remember @amirm making a big stink about the quality of the stock Aiyima power bricks so I decided to, "upgrade" to an MW. I corresponded with Aiyima about running an A07 at 48V and was assured it was o.k. but per other discussions, running the A07 with 50V electrolytics seemed to me to be pushing things a bit close to the edge.

I'm happy with the Fosi - (though I did modify it by gluing an 80mm X 80mm PVC dust filter (Three Bulls - Amazon) to the inside, top of the case) to keep things clean.

With that in mind, I think I've reached my endgame for inexpensive, Class D, TPA3255 based amps. I won't be buying the new A07 Pro.
 
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