Thanks for the suggestions...I don't want to completely cut off the port, then I'd have little bottom end. I'm stuck with them in the position they currently are, a little more than 1.5 meters/4 ft from the back wall. I think the Dacron suggestion will be the first try, being that it won't completely plug the port's...there are two, bass and mid-bass, speaker is a Jamo D450, which has turned into quite an enjoyable speaker for me (no, I don't plan on listing them soon).
Thanks once again, L'wood
Thanks once again, L'wood