Blu -Tack Under Bookshelf Speakers?

I used about 20 of the sheets of the DEP type of blue tack under my 100lb near door sized Mothers on 2" thick concrete slabs (75lbs of concrete each)
Made those babies sound tighter.
Try it. if it doesn't sound better right off, removing the stuff right away will be safe. It's after it sets together for a long time that it may damage the finish or veneer.

You can buy a device that adheres to the speaker cabinet and will tune out the cabinet resonances. Unfortunately I can't find the catalog where I saw it (MCM I thought). Spend 15 minutes looking and can't *&!#$@%# find it, sorry.
Vibra-pods under speakers will absorb resonances. But the speaker will not be solidly mounted and there could be problems with imaging.

Everyone wants to have their speakers sound their best. If you use the smallest of the Audioponts in conjunction with the Apcd coupling discs you will achieve this goal..I have done this many times for friends..Tom

Elizabeth:

I used the Dep for two years on the same speakers (Reynaud Twins in cherry). There was no damage to the finish (I could not even tell where it had been once I removed the tack to resell the speakers).

However, I have not tried it on painted finishes or those with a plastic top coat.

Also, what are concrete Mother's (sound interesting)?

I found it, I found it! Check these out:
Tekna Sonic