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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
blueranger's avatar
blueranger OP
719 posts
 
Thanks Geoff here is what I know.
102 lb load rated springs.
Spring constant 126.25 lbs per sq inch.
1.375" OD x 0.177" steel wire and 2.75 " length.
The slabs weigh 32 lbs and I  have four
The speakers are around 72 lbs.
I can get more when I go to town. I can't wait to try these. Thanks
geoffkait's avatar
geoffkait
23,365 posts
 
It sounds to me like your springs are more suitable for a 400 LB speaker. The spring rate of the system is the spring rate of a spring x the number of springs.
blueranger's avatar
blueranger OP
719 posts
 
Speakers are 42 inches tall.
davekayc
173 posts
 
People in little places , and theres billions of them. Wouldnt fit these in there places . I feel a strong spousal dispute. 
audiozenology
362 posts
 
blueranger,

Quick calc says your resonant frequency is about 6Hz. That does not feel right, but perhaps geoff can check my math. I was assuming 134lbs (2x granite + speakers). That do a pretty good job at isolating most stuff over 20Hz (will be down 10x at 20Hz). Another slab of granite is not going to make much of a difference in the isolation.
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