Suggestions for 'filling the port' of bass reflex

The bonded dacron that I suggested will turn some of the acoustic energy in the port to thermal energy, and thereby damp it's resonance. Done correctly(not crushed or tightly packed), it won't impede the woofer's motion. It certainly will not damage the system in any way.

George Short and North Creek appears to favor the approach suggested by Samujohn: he shipped straws with the Eska kit I purchased (rear ported). I've not compared the straws with other materials, tho. John

I tried the straws before I tried the upholstery foam, because Stuart Tyler of ProAc used straws in the Response 1 speaker years ago. It did not sound right at all in the ported Dahlquist speakers that I was using. Foam did the trick.

FWIW - are you aware of what you are doing when plugging the port? Depending on the tuning, the port may be beneficial in that it protects the woofer from extreme excursion at ultra LF.

Not all ports are tuned to boost bass although in consumer speakers most are.

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