With respect to amp, there are some merits in term of reducing cross-talk improving soundstage. Everything else being equal, I found that dual monoblock amps tend to have a more stable soundstage and focus. Intuitively, the less interference between the leff-right channel will improve the soundstage focus.
And of course having a well treated room will improve the soundstage as well. Likewise, better DAC, better cables, and so on will help as well.
As for cross-talk, there is more than just left-right channel. There are cross-talks between the woofer and tweeter as well. That's why bi-amp will eliminate the woofer-tweeter cross-talk which will in turn improving the soundstage and image focus.
And of course having a well treated room will improve the soundstage as well. Likewise, better DAC, better cables, and so on will help as well.
As for cross-talk, there is more than just left-right channel. There are cross-talks between the woofer and tweeter as well. That's why bi-amp will eliminate the woofer-tweeter cross-talk which will in turn improving the soundstage and image focus.