While I agree that all speakers “can” disappear to some extent or another and that things like the room and recording quality also matter significantly, some speakers still just inherently and more easily and completely disappear as a sound source better than others regardless of other factors. Joseph Audio does this and I’ll add ProAc in there too as standouts although there are certainly some others that pull this off well. So to say individual speaker recommendations are not helpful in this regard is simply not accurate in my experience because certain brands do excel at disappearing as a sound source better than others, and that’s what the OP was asking for here.
Speakers that disappear
I once listened to some speakers where i was surprised by their disappearing act - I don't remember the brand - I think they were stand mounted. I am currently looking for speakers - not too big - and was hoping for recommendations - I know other components matter too but I understand some speakers are noted for this trait and some don't. I listen mostly to classical and vocals, lighter pop - no hard rock (I assume the Beatles and 60's count as "light" :) ) Speakers I have
Harbeth PS3ER XD,
Martin Logan Stylos Speakers (wall mounted)
Aurum Cantus Leisure 2 Speakers,
Enigma Speakers - Enigma Oremus
Had Focal Aria 906
Thanks!