Down-firing Sub makes floor rattle

Room vibrations, that I understand, as in interacting with room acoustics. Floor vibration - that's a different story, it seems. Decoupling, proper placement etc, I am sure, could help to minimize the effect of the down-firing sub rattle. Personally, I've never had good luck with those, in real life environments. Floor, furniture...everything tends to vibrate more with down-firing subs,that's in addition to the usually less musical, overbearing bass quality. IMO, of course

hey, thanks for the info....i am getting very close to getting this sub sounding very, very good with pretty much seamless integration......i have been playing with the phase, which i just thought should be at 0 because the sub is in line between the speakers...while it gives me the most bass, it is not the best bass...i think this has been most of the problem i have been having....i have neen trying 90 and 180......180 degrees seems to be the ticket...all of the problems i have been having are mostly gone....i am now getting good tight, deep, bass, with no overhang...

zephyr, i do like those stands and may look into it

I had the same arrangement with my mains and sub alignment and began at 0 degrees phase. After much testing and test relocating of the sub, I found the original position was the best (to remove a room mode or two) with 180 degrees yielding the best, most musical and appealing bass...My REL B1 is front-firing however it does have a floor-firing port.