Not sure if its been covered before, I cant seem to find it but I want to get some sound up front and was thinking about putting speakers where the air vents are at the moment, but I want to keep the classic look and don't to be able to see the speakers so was wondering if I could fit them behind the air vent control? so it would all look original but instead of air coming out the vents I would have sound

Would it compromise the sound too much and is it simple to block the incoming air? I was thinking a bit of gaffa over the hole from outside but thats probably going to be useless
I have looked at all the other options but none really seem to be what I want. Speaker pods look big and bulky and I have heard that putting them in door pockets isn't great so this sounded like it might be a good option if its possible
If anyone has done it before or has any pictures that would be great or if my idea is useless then let me know
Thanks.