Sealing ported enclosure to reduce boom

Partially blocking ports is a valid option. You have to try it and see.

Yes, I have in fact even used socks on occasion to do it.

Foam plugs are really easier than socks.

With socks you have to have the right size and roll it up fairly loosely so not all air is blocked in the port. You usually want only partial obstruction of the air flow through the port.

BTW I also recommend tweaking placement away from corners and walls as the preferred soluton, but obstructing (not sealing) the port is an easy option if that is not possible.

I like Duke's ideas!

I've seen the port diameter trick done professionally to improve performance.

Never tried the straws approach but it sounds good!