Any solid carbon disc will get you the desired sound…whether a flat disc or convex disc gets a better sound, I don’t know honestly.
But a wheel like a FLO disc or HED Jet will NOT get you the whomp whomp whomp. Those are regular spoked wheels with basically a fairing over them. To be avoided at all costs.
And yes, it is all about the whomp whomp whomp. I used a wheel cover for a few years, which was just as aero as a disc…but I eventually caved and spent the money because I “needed” the whomp.
I’ve seen people make their own disc wheels with a can of spray foam, a disc cover (homemade at times) and a regular spoked wheel. It will whoomp.
I’ve got a HED Jet Disc and it doesn’t whoomp as was posted above. Been tempted at times to fill it up with a can of spray foam honestly to get that whoomp sound and also to give it a bit extra reinforcement for strength. But can’t get myself to void the warranty (and the ability to true it should it go slightly out of round).