Bloated speakers/weight wise

Aha! Onhwy61 has offered a good explanation as to the workings of my speaker. They have a downward firing bass tunnel running the full height of the cabinet and the size of the aperture facing the floor is quite large. The freedom of the backwave to escape and the direction it goes would perhaps explain why the cabinet neither rocks nor vibrates.
My first post was written before his explanation appeared.

Macrojack, my explanation applies to both sealed and non-sealed speakers. A port, if appropriately designed, offers a controlled path for pressure to escape the speaker cabinet. Ported speakers still have to address cabinet flex. If I got it right, doesn't your speaker have a very slick multi-layer cabinet design. And since when did 70 lbs. become a light weight speaker?

Hwy-

I think you are correct about the cabinet but I am not sure.
I think 70 lbs. is light in comparison to the behemoths being mentioned here. And the things are over 4 feet tall besides.

The aperture at the bottom is about 4 inches by 9 inches. I don't know how it is configured inside but I would imagine an opening that large would present little resistance and therefore minimal pressure. Is that correct?

Macrojack, How do you know that your cabinet does not produce any sound? How did you test for this?

After reading some of this thread I did a little experimenting. First I tried to feel vibration on the cabinet with my fingers and could not feel any, so I tried my lips and then my check (the one on my face), still nothing. Next I held a glass up against the cabinet, (you know, like holding a glass up to a door as to hear what is being said on the other side of the closed door), then I could hear something coming through the cabinet. But what worked even better is just to press your ear firmly up against the cabinet, by doing this I could hear even more. Don't forget to plug the other ear and cut the volume off on the other speaker.

Have you tried that? If not, how did you test?

Line-
I'll have to try your experiment later. I just took a break from painting the living room. The system is dismantled. What I've done so far was just feel it while it was playing. Didn't feel any resonance as I have in other products at times in the past. I concluded that if it wasn't obvious, it wasn't happening. Certainly if you must go to stethoscope extremes to detect resonance, it must be small enough to be overlooked, at least in post-amplification circumstances.