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Say "Hello!" to boXem | audio Arthur series, Hypex and Purifi based power amplifiers

BR52

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Hello boXem | audio
I am interested in your purifi stereo amp. For me is always important to check the difference to other products before I buy. Here are my observations: I see a really nice craft man ship! I like the automatic standby, because I am from Europe as well. Build in Europe is also a criterion. What I am missing is a little more information about the frontend of the amplifier because this is the part that can make a big difference. A schematic would be helpful. I don't know how to secure your IP but I am sure you can find a possibility.... To know the key parts would be helpful. The color of the box is for me only important related to the WAF
Thanks in advance
PS: I'm working in embedded electronics for many years. And I know my English is not the best one.
 
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boXem | audio

boXem | audio

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Thread Starter #185
Hello boXem | audio
I am interested in your purifi stereo amp. For me is always important to check the difference to other products before I buy. Here are my observations: I see a really nice craft man ship! I like the automatic standby, because I am from Europe as well. Build in Europe is also a criterion. What I am missing is a little more information about the frontend of the amplifier because this is the part that can make a big difference. A schematic would be helpful. I don't know how to secure your IP but I am sure you can find a possibility.... To know the key parts would be helpful. The color of the box is for me only important related to the WAF
Thanks in advance
PS: I'm working in embedded electronics for many years. And I know my English is not the best one.
Hi @BR52
We are open to open source (pun intended), but not for all projects. In example we will open source an input buffer for DIYing Purifi amplifiers when we find some time for this.
To try to answer your question, opamps are OPA1656, LDO is a TPS7A39. Input schematics is the classical two opamps instrumentation amplifier like the Purifi demo buffer. Resistors in the audio path are 1206 thin film.
Embedded electronics are a very large field. Curious to know more.
And your English is not worse than my frenglish.
...he’s trying to make a living;)
Indeed :). But honestly, the parts I want to protect is what make us different from the others. For the rest I do not really care.
 

BR52

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Hi boXem | audio
thank you for the information. My intention at the moment is not to DY an amplifier. I am more interested to buy one. For me is fun to see how new start-ups coming to market specially with a system integration approach. Because it's not so easy to take care of all the technical requirements (thermal management, EMI, safety regulations and so on.....) for example thermal issues hitting mostly back in the long run and can easily destroy a hard build reputation.
As we know, coming with a product to a market with a lot of well known parts (purifi) from my point of view it would be necessary to show the world we can make an amplifier not disturbing the given performance from the data sheet. So a test from an independent institution to show is in my eyes not mandatory.
I would before I go to this institution check the performance by my self. Because to argue later is not the best idea and I have not the ability to fine tune (wiring...?) anymore.
Hopefully I could help a little (I know you didn't ask for)
all my best
BR 52
 

BR52

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Hi here from an other thread
Mar 25, 2021
#148











I think it is important to test these amps to make sure the buffer did not degrade performance. A lot of people are buying these amps on the strength of my review of the reference design. To the extent they are not, as was the case with NAD, we should not assume performance is the same.




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