Two that come to mind are the above-mentioned Linkwitz LXmini's (where the sweet spot exists pretty much everywhere in the room) and the venerable Spica TC 50's and 60's. I heard a pair of ML Montis with a Lyndorf receiver and in the narrow sweet spot, the speakers really did disappear. I imagine the Cube Audio speakers would do the same thing.
Are there speakers that disappear regardless of the recording?
I have a pair of B&W 805d3’s. Strictly analog system. Source is the Clearaudio Ovation, Hana SL cart. Herron VTPH-2A phono stage. Rogue Audio Cronus Magnum II integrated amp. The speakers sound great most of the time. I have many records that cause the speakers to essentially disappear with a holographic sound stage, beautiful imaging and great dynamics. Some other records, not so much. Curious if there’s a way to achieve disappearing speakers no matter what recording you throw at them? Thanks!