Anyone who wants to experiment with plugging the port(s) on your speakers might be interested in this source I found for foam plugs. These are NOT audio-specific port plugs, they are just the appropriate size and foam density (see link at end of post).
The plugs are available in a variety of sizes, to accommodate port openings of up to 75 mm. I bought some of the 35-45 mm plugs for my ELAC Debut 2.0 F6.2 floorstanders (their ports are roughly 38 mm) and they work great to plug the lower two ports that vent the bottom chamber that holds the two 6.5 inch woofers. Very handy if you need to place the speakers closer to the wall and don’t want the resulting bass boom.
The F6.2 is a great candidate for this because it is essentially a B6.2 bookshelf (albeit with a rear-facing port) resting on top of an acoustically separate lower chamber with the two woofers.
The plugs are fairly short at roughly 1.75 inches, except for the 46-65 mm ones which are 3.5 inches long.
One possible cosmetic drawback for some people, the plugs are available in white only.
Oh, and the shipping charge is brutal, $24 as I recall. So make sure to buy other stuff on your order to make the shipping charge less painful. I got several boxes of vinyl gloves at a pretty good price.