Amir-again dumb retort. Of course good designers use test equipment to design and test their results. However, if it ended there, they are making HUGE mistakes without knowing it.
Well, the dumbest thing is to take the word of a designer attempting gorilla marketing in forums and such. Why on earth would you trust what he has to say about his own gear? Isn’t he totally biased to get you to buy his gear? Would you trust a drug from a drug company with no government certification and controlled testing? Why would you put your guard down when it comes to audio? What happened to common sense?
And no, they would not make "HUGE" mistake if they stopped at instrumentation. As I explained, there is no reason to know they have good ears whatsoever. On what basis you put any value on what they think of their own gear vs another? He knows how to design electronics but all of a sudden, he has golden ears too?
Nothing wrong with claims about fidelity. But that better be in controlled listening tests published with full documentation. Him saying he tried many things and the one being sold is the best is hogwash.
I tested a PS audio directstream DAC. It measured poorly in low frequencies. After a bunch of back and forth with claims you believe in, it turns out that for cost reasons they used low quality transformers that produced more distortion! Multi-thousand dollar DAC used low quality parts. So you better not believe company claims. Your trust should only be on what you can verify. And I am here for verification. If you don’t like that, setup your own controlled listening tests. These are the only proof point that respected audio journals accept. Don’t make up your own methods. They only serve to confuse you into spending money after bad.