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haralanov wrote:

There is a huge difference in sound with hard and soft (sand based) walls even at 1mm excursion from the driver.

If it so ten it is an interesting found. As I understand it is about the “stopping wall”. I wonder if the positive effect you report would be identically favoriteable for 100Hz and for 30Hz. That way I asked you where and how you cross your LF section. I think if to think further in this direction then it is possible to use the “hard wall” but to make the surface of the wall not flat but with high indentation textile, like a high bas-relief. Then the leading edge of the pressure of wave will not hard-bounce from the wall but will be time-damped, mimicking what you do with you soft wall. I think it is a cool idea and I never seen it done in hard surface inside the speakers. Pretend that you have the profile of the inners wall of enclosure like on the image below, with irregular high of the peaks, and made not with soft foam but with hard wood. That would be very cool to experiment with….

haralanov wrote:

It is not my experience. I realize it is sensitive to some degree, but not that much. I tried to find the reason why they behave in this way in the context of your acoustic system and I think I know the reason if it is the wiring diagram of your LF section:

Yes, it is my wiring diagram only I have all 6 drivers 25W or the 10”.  Sure, I would need to go for all parallel connections and rewind the transformer for 0.8R secondary. It is somewhere at the bottom of my list to do… sometimes….  BTW, one of the reasons why you might have less sensitivity to the damping change because your SET amp might use some global feedback, does it?

haralanov wrote:

The sound have totally different influence to the listener this way. The sense of scale just doubled when the front baffle became twice as wide.

Interesting! I never looked into it.

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