Humming coming from my 01 Boxster, any suggestions on what to look for

[Jasper7821]

I've had my car for 6 months and always cruise around with the top down.
Now that it's getting cold I put the top up sometimes.
Now I can hear a humming that goes along with the speed of the car. Any suggestions on what it could be, the car runs great.
Motor RPM doesn't matter, it's louder as the car speeds up and under 20mph or so I can barely hear it. On the freeway at 80 or so it's not horribly loud, but definitely noticeable.
Warm or cold, it sounds the same. And I don't think it's the tires.
Here's a link to the video and you can hear the noise if anyone can assist.
https://1drv.ms/v/s!Atil9WC21-BZ4Fk4zp5IyLVEJ0gv?e=uVQXhG
Thanks,