Different brand same amp?

[Katji]

power = wattage

Same. The circuit/boards are the same.

[quote,how loud they can play and power supply,adapter

Some amps comes with a 24 v power supply and some has a 32 volt power supply, there might even be one that comes with 19 volt instead of 24 or 32 instead of a 24 volt power supply

Then you check, you check the package that is advertised, you send message to the supplier asking about the SMPS. "might even be" !You check, you ask, you find out! Otherwise you assume the same!

 

[JohnYang1997]

I'm not talking about "more or the less the same." In this case (i.e. the amplifier/s you showed in post #1) they are the same, only the face plate and fonts [of labels] are different.
When you understand the China manufacturing situation, and you see those photos of the products, it is obvious.

So you know better obviously...

 

[Katji]

Maybe you know better and you can explain better. Maybe housings are same with different face plates but the boards inside are actually different?

 

[JohnYang1997]

Maybe you know better and you can explain better. Maybe housings are same with different face plates but the boards inside are actually different?

I mean. It's not that clear cut. I'm not saying it's 100% this or that. But be cautious. This raises question, yes. So the next step should be reaching out to the manufacturer and see what they say about it. If you look at the counterfeit D10 case, it's much closer than these.
https://www.audiosciencereview.com/forum/index.php?threads/aimpire-ad10-fake-topping-d10-dac.11244/
Also refer to counterfeit sp200 https://www.l7audiolab.com/f/audio-am01d/

 

[egellings]

There are probably a very small number of suppliers like Hypex that supply a standard selection of switchmode amplifier modules to the home audio industry. The modules are difficult to properly design, so it makes sense to just second-source them from trusted suppliers. They'll all sound more alike than different.

 

[JohnYang1997]

There are probably a very small number of suppliers like Hypex that supply a standard selection of switchmode amplifier modules to the home audio industry. The modules are difficult to properly design, so it makes sense to just second-source them from trusted suppliers. They'll all sound more alike than different.

Hypex, Icepower yes. Not with chip amps. Ti and ST etc have open reference circuits that end manufacturers can make and build from.

 

[egellings]

By 'module', I mean a small PCB utilizing either discrete or chip-based or combination of device electronics. Suppliers you mention supply the chips used in the PCBs.

 

[JohnYang1997]

By 'module', I mean a small PCB utilizing either discrete or chip-based or combination of device electronics. Suppliers you mention supply the chips used in the PCBs.

If you can make a solution yourself the cost is automatically lower so no modules for chip amps.
With purifi, hypex, icepower they only offer full modules so themselves can make money. No company would buy modules if they can buy the chip.

 

[eas]

By 'module', I mean a small PCB utilizing either discrete or chip-based or combination of device electronics. Suppliers you mention supply the chips used in the PCBs.

There are (were?) plenty of Chinese class-D amp modules available, but most of the finished amps like these seem to use purpose-built, integrated boards. The one exception is the bluetooth functionality. Many, but not all, seem to use small PCB modules.

 

[gasolin75]

A week or 2 i have read alot more on ASR on class d amps, some i think are basically the same despite different brand

How do we know what amp to buy ? I think if theres a difference we would like to buy the best version, of course there could be a difference in price and what power supply it comes with 24v 4.5 a or mabye 32v 5a, that's just easy to see, what about the differences we can't see before we buy one ?


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The fosi amp has a better/bigger bt antenna

 

[gasolin75]

Another one of these amps suca audio is a paart of douk audio,nobsound as i remember

https://www.audiophonics.fr/en/full...a-2x90w-4-ohm-bluetooth-50-black-p-15362.html

 

[JohnYang1997]

Just got reply from Aiyima.
'We are the factory, and they are all made to order from us.'

I am not exactly certain what the latter half means. But I guess it's saying they are all made by Aiyima. I replied for further confirmation.

 

[JohnYang1997]

There are (were?) plenty of Chinese class-D amp modules available, but most of the finished amps like these seem to use purpose-built, integrated boards. The one exception is the bluetooth functionality. Many, but not all, seem to use small PCB modules.

For end user to DIY yes. Not for companies to integrate like purifi, hypex etc.