I know this is a dead thread and speaker box and noone could care less but...I was super unhappy with the MAS18 last night in this loud concrete and glass restaurant, it was loud but totally indistinct and hard to hear. During the break I went onto the fancy bathroom and took a couple of their cloth hand towels and stuffed the ports of the 18. Damn thing tightened right up. Anybody have any experience plugging the ports on these boxes to get a more directional sound?