Well does it put it on the correct sound stage that's the question in all of this. May be what
@East Yorkshire Retrofits point is. It's suppose to matrix that out on the speakers and the ".1" the subwoofer should be getting it's channel. Centre it's. And so forth. 5.1, 7.1 etc.
Does Cupra support Atmos etc.... If it did you'd expect it to plumb surround sound onto the correct speakers as if a fully blown AV amp. OK more research and edit cycles and we have this >>.
That Pioneer system you would expect to correctly marry into your car speakers ditto Android Auto. I just use the Sony "neural" DTS Neural:X which is a DTS trick field on the home system for 2 channel but will snap into the correct field when it's got one, Dolby 5.1, Atmos, DTS etc. Tap the info button to see what it's up to or rather how it's handling it. Neural works for me to stop it going flat. The back speakers do there thing. There is a Dolby version of the upmixing but DTS Neural:X seems better.
Suspect these car system have their own neural sound field processing irrespective of source but wouldn't honour the materiel's released field but just matrix it. Turned this into an car AV corner.
For those with home systems the hunt is on for surround sound BBC programmes that aren't supported on the iPlayer. Only does 2 channel AAC. Stereo. You have to wait for other streamers or bluray to get the material till you can get surround. Reckon some people mix the 5.1 sat channel with the 4k HDR. Pick and mix.
Tavascan incarnation as an example:
Discover how CUPRA & Sennheiser are working together. Visit our website for more information.
www.sennheiser.com
The
Tavascan's system is a bit like DTS neural X with a sound model. The next level up is Atmos processing.
Their description of the audio processor generalised, takes two channels and manipulates it into spatial sound:
Discover mobility with Sennheiser. Visit our website for more information. Quality meets innovation!
www.sennheiser.com
Tavascan demo by the Sennheiser guy:
BUT it does latch into Dolby Atmos:
Sennheiser and Smart Europe announced the rollout of a highly anticipated over‑the‑air (OTA) update enabling immersive Dolby Atmos audio playback through Amazon Music on the Sennheiser Signature Sound System. The Smart #5 model is the first from the Mercedes-Benz/Geely partnership in Europe to...
audioxpress.com
Thus I reckon it runs like a home surround sound system, 2 channels it does its thing with immersion controller per the
video, Dolby Atmos it goes off and does it's improved surround sound thing. Audio models and all that.
Not sure which car models they have done that yet. That's going to take the ".1" and put that on your subwoofer. For the
Tavascan the guy named that the car had the 5.1 set up of it's 12 speakers. The magic 5.1 of surround sound. .1 the subwoofer. Left, right, centre and rear left, right. 7.1 if you got elevation speakers. The sound field immersion stuff tricks the ears to give height as well without the two additional speakers. Dolby Atmos.
Probably that Pioneer system is doing something similar. Key words to look for "
Sennheiser’s Ambeo Concerto software" for their Vag offerings and
Dolby Atmos for the extra if and when that element is rolled out.... learn something everyday

.
Now it wouldn't be complete without the Dolby Atmos wiki
en.wikipedia.org
Notice it lists off where Atmos is being put into cars, Audi being one. They probably need to extend their wiki list. For a customer you would be looking for those Dolby Atmos words. I think without it on a Sennheiser car system you'd get sound stage processing as per the guys immersion slider but not taking the Atmos output but as said by Guy you need an Atmos source. All icing on the cake. No immersion slider on your Cupra then you haven't got the surround sound audio trick department as per Sennheiser built into your system. A lesser mortal may be.
Those audio parameters that
@East Yorkshire Retrofits tell mib2 people that change their system without changing that file is the early version of shaping the sound for the body of the car and speaker layout. The whizzy Sennheiser’s Ambeo Concerto software puts it on power with a home AV systems of manipulating 2 channels into immersion surround and Dolby Atmos the next level assuming they have done that on Cupras ?, whilst home AV systems latch into many more audio formats used in
video as well. Basically you use the artifical immersion on two channels and the actual surround if you can decode that.