Right now I have my stereo sitting on a table in my dorm room here at school. My stereo takes up the back part of the table. My bookshelf speakers (Monitor Bronze B2) are at the edges of the table, with my equipment in between.

I used to have the speakers sitting directly on top of the table, but that caused the table top to resonate when music was played at certain frequencies. This caused a significant reduction in sound quality.

I was able to ameliorate the problem by putting each of my speakers on top of an old textbook, and placing coins between the speaker and textbook to prevent the textbook from vibrating too much.
What would be a more effective way to fix the problem? Speaker stands are out of the question... my dorm room simply isn't big enough. There's really nowhere else to put the speakers besides this table.

So what would help? I was thinking I could get spikes for the bottom of the speakers... something like this. Any other ideas? It would be great if it would be something I could make myself or get for cheap at a hardware store... "audiophile spikes" seem a little overpriced to me.

Thanks.