port placement?

Currently building a fiberglass box for a 15" L7.  I'm putting a port on each side of the sub and want to kind of angle them for looks, but I don't want it to interfere with performance.  So is this a bad idea to put the ports this close to the sub or should I stay clear and by how much.

Here is a pic of my idea.  Port opening is 3"wide x 6.5"tall.

Black is the box..but mine isnt that exact shape. Yellow is the ports.  Light gray is magnet.  Dark gray is sub. 

[img]https://img104.imageshack.us/img104/6718/portboxdx3.jpg[/img]

Thanks.

You should be fine with that configuration so long as the ports are at least 3/4" way from the back of the magnet.

Ganbatte ne!