In fact, that's what good playback does. The "envelopment" in the sound, which the headphone thing should nominally do, occurs from the speaker reproduction - it completely takes over the acoustic environment in which you're located - extraneous noises completely cease to exist; if the phone rings, right next to you, you most likely won't hear it ...
This is why "testing" this, for people who experience it, seems ridiculously pointless.
This is why "testing" this, for people who experience it, seems ridiculously pointless.