On my 70 kickpanels the vent is opened and closed with a wingnut. I just replaced the passenger speaker, the one that came installed in the kickpanel blew already. No amp or extra power, just wired into the deck/reciever. I went with a deeper coned speaker I had sitting on the shelf. It fit in the kickpanel hole with a few mods. Oh I have only had the speakers in for 5 months.
Rob