Desirable, yes, ofcourse! But psychoacoustically unnecessary.
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Yes, I used the FM stereo example as an extreme one to let one know that you do not NEED -100dB (or better) crosstalk figures to get the full stereo effect (HD FM radio is not much better). The ear-brain system will be preoccupied processing higher SPLs while masking out the simultaneous but much lower-by a factor-of-a-million(!) xtalk sounds. The masking effect is even more prevalent at higher SPLs than at lower ones. I believe you are making my point, probably without realizing it. They are much blunter instruments than we'd like to believe. Human ears are NOT precision instruments like the APx measurement system.
You will not hear or not even be aware that it exists. So 1W of music in the left channel + 1uW from right channel xtalk => 1.000001W of combined music power, where 0.0001% comes from the crosstalk channel. You will not hear it as you are not superman with super hearing capabilities.and on top of that, your ear will be pre-occupied with 1W of music from the left channel itself. Having -120db xtalk is really nice but your brain will not have a fit if it was This means that if the right channel is playing 1 Watt of music, the left channel experiences a 1uW of xtalk or interference from the right channel. High-frequencies of 10kHz are 'masked out' or given 'less priority' by our brains, so they do not seem to contribute that much to imaging. The majority of music exists in the midrange and that's what is played the loudest. Why didn't it sound like mono with such 'poor' specs? Our ears mask a lot of musical content based on its loudness levels. You should be aware that our beloved analog FM stereo radios that have been with us for decades and provided lots of enjoyable music over the ensuing decades have stereo separation figures of -35dB to -40dB (on strong signals) in the mid-range and worse at the extremes! And yet, we enjoyed the stereo effect very much.
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