speaker plinths

Thanks that will save me $

These tweaks are very system dependent.
Also, using spikes under the maple platform will affect their performance
I have also heard of using two pieces of marble glued together as being another way to achieve a solid and neutral base-with the glue providing a way to dissipate resonances. 
I just got a pair of Townshend speaker platforms for my Treo's. I'll post my thoughts when I get them set up.
Bob

Not at all.

Yes, just make sure the footprint of the plinth is sufficiently large compared to the speaker footprint to avoid any unfortunate accidents such as the speaker accidentally tipping over and crashing through the window. Been there, done that.