Hmm... the shirt buttons help a little bit, as do more coins: stacking two dimes on top of a nickel seems to work pretty well... there's a nice gap between the bottom of the speaker and the top of the book.
I still find myself going back to my Grado SR-60 headphones for serious listening though... even in the best of conditions my speakers are unlikely to sound as good. Oh well.
You might try a set of Vibrapods. They're relatively inexpensive - I just don't know if they'll dampen your speaker vibration enough.
http://audioadvisor.com/store/productdetail.asp?sku=VIBRA41
You could also try some sorbothane sheets or Blu-Tack (but, bear in mind these might stain the table finish):
http://audioadvisor.com/store/productdetail.asp?sku=AQSORS
http://audioadvisor.com/store/productdetail.asp?sku=BLUTACK
There are a number of other vibration control devices at varying price points you could explore:
http://www.amusicdirect.com/products/search.asp?cat_id=310&man_id=ALL&advSearch=stdSearch&search_desc=no&keyword=
I suspect the Vibrapods might be the least expensive route to go.
If you have an old shirt hanging around, pop the buttons off and try them under your speakers. Three for each speaker.
Shirt buttons? The hard, little, translucent/pearlescent ones? What a neat tweak.
Hmm... the shirt buttons help a little bit, as do more coins: stacking two dimes on top of a nickel seems to work pretty well... there's a nice gap between the bottom of the speaker and the top of the book.
I still find myself going back to my Grado SR-60 headphones for serious listening though... even in the best of conditions my speakers are unlikely to sound as good. Oh well.