There is so much variation in components, layout, parts selection, and so on, that this subtlety can be swamped, if you don't know what to listen for.
What it takes to really hear it and know it... is to complete a new piece of gear with about 3 of the top ROHS complaint solders and then do the same piece again, with leaded solders, the ones considered 'best' in the world of audio. Then burn in, and try the 5-6 items individually...wih the only differences being the solder, in a-b/etc aural testing.
Then you'll learn to recognize what ROHS does. A subtle but pervasive downturn in sonic qualities available, in my experience and that of some others who are willing to do the involved level of testing, and actually make mention of it.
It's one of those things that no one wants to talk about.
What it takes to really hear it and know it... is to complete a new piece of gear with about 3 of the top ROHS complaint solders and then do the same piece again, with leaded solders, the ones considered 'best' in the world of audio. Then burn in, and try the 5-6 items individually...wih the only differences being the solder, in a-b/etc aural testing.
Then you'll learn to recognize what ROHS does. A subtle but pervasive downturn in sonic qualities available, in my experience and that of some others who are willing to do the involved level of testing, and actually make mention of it.
It's one of those things that no one wants to talk about.