Because things that measure well, USUALLY don't sound bad! And the inverse is also true. If it measures poorly, in all likelihood it will sound bad. No offense to all the tubes lovers here that want that warm (harmonic) tube vibe. And, in the end, mods can go sideways, and then you end up with one or more unintended negative consequence to your original mission. But hey, this is DIY after all.
In many ways, some mods start to push the envelope of diminishing returns. And some reach the nuanced improvement level and expectation bias starts to set in. We WANT to hear a difference, therefore we will. Just say'n. Edit. @TNT I was still composing when you posted. I agree with much of your post above.
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Hi mamocel, as you must know, I have a Sabaj A20a and I am completely satisfied with it, it is plugged into my secondary chain.
I think like you, if it is a TPA325x, I do not buy because even if the sound of the PA5 is good, I pass my turn on this chips.
I am also waiting for the subjective feelings of Daniboun, because he owns the A20a, he will be able to compare.