I have always considered Spikes, for heavy speakers, an essential, to pierce the carpet and to convey the bass frequencies to the floor boards, and also to stop the speaker swaying under the cone's movement.
But whether or not to spike the speakers on TOP of a speaker stand is a new one to me.
Should I put spikes in the top of my speaker stands (holes are there, waiting) and let the speakers rest on four, solid points, or should I rest the speakers on the stand as they are?
I googled the point, and came up with a nicely written, recently updated thought which is linked below.
I never EVER thought that speaker spikes (or cones) were to reduce vibration. After all, vibration IS sound.....but it seems lots of people do think that's what it's all about.
And I, personally, have owned a set of speakers that DID sound better on soft set of feet.
Either way...a good read
http://www.audioholics.com/education...019s-the-point