I’m not sure if driving a car with the top and windows down the ultimate wind test or not
It assuredly is not the ultimate test.
It’s a test, though. It also involves both of the types of wind noise I referenced upthread.
because you’re still sitting right directly behind a humongous windshield
Well, not all that big. The top of my head is a little higher than the edge of the windscreen surround. I suppose it depends upon ones definition of “humongous”.
so there’s no direct wind coming from the front
Apart from the wind on the top of my head, that’s correct.
and all you get are blown-back winds from behind.
Not true for my car. Anything that isn’t stowed correctly is likely to get blown around or out of the car. An example from the drive I mentioned is that after I put an empty plastic water bottle in the cupholder, it blew out, hit me in the chest, then bounced around the interior for a a bit before lodging under my seat. Brimmed caps will get blown right off.
I think riding a bicycle at 15mph and up is a better wind test IMHO.
Perhaps. What can you report about your experience having done that wearing Resound instruments?