carpet under speakers?

i see in a lot of system pictures that people with bare floors place carpets under their speakers. is this for any sonic benefit, or purely to proctect the floors?

i have a set of acoustic energy AEgis EVO I's on Atlantis SBF sand-filled stands which have spikes which sit in little metal floor protectors on my wood floor.

would (wood?) 80) i be advised to place carpet under the stands? does it matter?
Acoustic benefit. A carpet between the speakers and your ears absorbs the first reflection point from the floor. Similar to the sidewall first reflection point.
I think that what you are asking about is a little square of carpet under the speakers, and not the entire floor. Well, it does protect the floor, and also there is a possiblity that if you use discs under spikes on bare floor, the will be some buzzing, and perhaps movements at louder volumes. Carpet prevents this.