DIY speaker isolation base for a wood floor


A definite sonic improvement in tightening up the bass. 
1. Start with 4 aluminum cones. I used some old Mod Squad Tip Toes.
2. 16x16 slab of granite.
3. 1/8 cork.
4. 1/2 inch neoprene rubber.
5. 1/8 cork.
6. Top with another 16x16 slab of granite.
7. Enclosed with a wood cradle to hide the mechanism.
  The granite is from scraps from a shop and was cheap. The added 1/4 inch of neoprene to 1/2 inch thickness did help. Let me hear your thoughts.
128x128blueranger
On the advice of Dr. Edgar I built a pair of sand boxes slightly larger than the bottom of my Fitzmaurice HT Tuba subs.  Each box contains 100 pounds of fine white sand with the subs sitting directly on the sand.  I think this addresses both issues nicely.
Isolating the speakers on a proper isolation stand (I.e., spring based) accomplishes two things. it prevents mechanical feedback to the front end electronics AND reduces the resonance of the speaker cabinets. Hel-loo! 
Springs go lower and are more effective than a sandbox. The sandbox was usurped by springs and air springs twenty years ago. Even Bright Star, the original sandbox, saw the writing on the wall.