[froh]

which is interesting but not the point?

[jcelerier]

But it's in part because of the latency due to the distance to loudspeakers, which isn't an issue with headphones

[tecleandor]

I think the loudspeaker part was a comparison to understand it a little bit better.

"If the system processing your signal introduces a 20ms delay, it would be the same as standing 20feet away the loudspeaker you're using as reference."