I still have to hear a headphone that can reproduce sound like monitor speakers in which the monitors disappear and you are presented a sound/music that is staged in front of you and behind the speaker with an even deeper phantom center stage.
This is what my initial speculation the OAE1 can replicate with its driver placement and design.
Well, making the source of sound “disappear” and blend into phantom angles is a tricky thing. With monitors and HiFi home speakers, the room is just as much an instrument participating in the playback as the speaker is. As sound waves emanate out from a point source (such as a speaker) in the shape of a sphere, the part of the sphere that was heading directly toward you is what you hear first, but everything that bounces off front, side, and back walls arrives later and at different angles. Without a crossfeed and something to emulate those room reflections, you will not get that surround sound /spatial effect.
With that said… headphone surround is possible, with a little help. Speaker-like headphone sound has been my goal since early 2009. One way to achieve this is to record and master music (or other media) with playback intended for headphones in the first place! Some artists use binaural microphones that look like mannequin heads and shoulders: put one of those in a recording studio with musicians or a pair of monitor speakers and they will record that “phantom center” and diffuse field reflections and reverb of the room accurately and you will hear it in the song playback. Chesky records is notable for having many recordings made this way, but This album is another example of that technique:
https://songwhip.com/ottmar-liebert/up-close
Music engineers can also create headphone mixes after the fact using Head-Related Transfer Functions (HRTFs), which is processing that mathematically uses sound measured at the ear, compares that to the sound as it would measure at the speaker, and saves the contrasting difference in frequency response and micro-timing changes as an effect to apply to speaker-mastered-music (plus crossfeed) to convert it. Apple Music and Tidal prominently feature playlists of stereo music remixed in this way using Dolby Atmos Headphone, but I find the effect better when engineers tailor-tune the effect:
https://songwhip.com/ricky-martin/pausa-headphone-mix
In my experience, Spatial Audio for headphones is most convincing when the listener uses head-tracking combined with a customized HRTF; after all, our ears are physically even more unique than our fingerprints, by orders of magnitude. Not all VR headsets or sound cards allow the HRTF to be customized, but the natural ERTF (ear related transfer function) of a fullsized headphone with angled drivers does go a long way towards naturally applying that personal reception tonality to everything we hear.
The pictures of the OAE1 drivers show they are more angled than any headphone than I’ve ever seen before. For the complete “in front localization” illusion, we still need to add that difference between the sound at the speaker and the sound measured at the ear, also head tracking of subtle movements, but the OAE1 will be a great platform to add generalized processing and crossfeed because of the inherent ERTF effect of the design that will bounce sound waves off the multitude of folds and cups of our outer ears.
We can only hope. But outside of binaural recordings with headphones it may not be possible but I'm waiting for the day.
For those who have never experienced a properly set up stereo speaker system there may be a slight learning curve as the headphone listening experience is quite different.
The OAE1 listening experience may be different from other headphones, especially those with drivers positioned at 90° (like the HD 6XX/650) or in-ear canalphones that bypass the outer ear / pinna, but the OAE1 might actually sound more natural like how our ears head the live environment. As long as the tuning isn’t so wild it overpowers the ERTF entirely.