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The recording interfaces I have measuring each other have around 120 db channel separation. A couple db better at low frequencie and a couple worse in the treble. The March DAC 1 I think had 115 db. The Marantz 7701 pre/pro has about 86-90 db depending upon which channels you measure between.They can be designed to make crosstalk irrelevant, but it takes careful and considered design, something seemingly lacking in a lot of modern, single board, super-compact designs these days.
CD players in the 1980s achieved >125dB crosstalk with very careful design, so it was essentially 'nailed' in the source department 30+ years ago.
Many stereo preamplifiers achieved around 90-100dB in the early 1980s, so that was deemed done and dusted too I guess.
I'm not confident many of these currently available single PCB mini components can approach similar levels. Maybe Amir can do a few L into R and R into L tests, just for fun, to see where the current gear sits. It's easy enough to shut off one input and measure the breakthrough from the driven channel into the undriven channel.
Just as an example.