Sundown SA-12D4 Aeroport question

[HomeLite]

Will a 4" diameter aeroport such as this one:

Amazon.com: Precision Port 4 Inch Flared Port Tube Kit: Electronics

be ok to use with a SA-12D4 on 750w?

Bonus question of the day:

If you install "pro audio" mids with paper cones in your doors, how do you keep them from getting wet when it rains?

[HomeLite]

Fiddlesticks! I put this in the wrong place didn't I?

[Odd-io]

I'd use two of them.

If the window seals are in good condition most newer vehicles don't get any water in the doors.

[TitoThePirate]

roll up your window.