Putting weights on speakers?

I use the same tweeters by the way, and those are phenomenal. :)  It's interesting the woofer is crossed as high as it is.  1 kHz... Hmmmmmmm...

mahgister, what happen's in the audio room stay's in the audio room. I imagine this is the look your wife give's when you explain your tweeks. 🙄

basically you added mass and therefore reduced the natural frequency of the enclosures. 
is there a limit to heading in this direction where the sound becomes something we do not car for?  
example- Magico aluminum enclosure speakers and subwoofers.  
somehow the bass response of these speakers was foreign and disorganized.  the midrange and treble were phenomenal but the bass was horrible.  i suspect that the enclosure was too rigid and actually causing the drivers to resonate.  just a guess.

if we made enclosures from concrete, would the same thing happen?  

i believe we are used to a certain amount of cabinet resonance and like what it does for the sound.  

mahgister, what happen’s in the audio room stay’s in the audio room. I imagine this is the look your wife give’s when you explain your tweeks. 🙄

You are right on the spot.... :)

But she know i love my audio system much then approve me without saying it too much openly....

By the way one of the most precious thing to have is a room only dedicated to the audio system.... With this you can made many improvement which are impossible in a normal room used for socializing reason....

for example for the active acoustical controls:

a- I use a grid of active metal resonator (50)
b- I use 20 Helmholtz bottles of different sizes
c- I use a grid of connected stones and crystals
d- I use a grid of cheap 10 Schumann Generators modified with crystals and stones...
e- I use a grid of 90 little bells or cones of 2 different sizes(7mm or 9 mm)

and many others things like passive acoustic materials etc....

I also has modified all the main electrical grid of my house.... :)

mahgister, your tweaking program is far beyond my comprehension. I'm sure it does wonders!