I insist on Viablue Tri Absorbers, nice quality, easy to set up-no need for an assistant to place them under the speaker:

ViaBlue TRI-Spikes:
· Adjustable Height Vibration Isolation Spikes
· Constructed of Solid Brass and Hardened Brass w/ Steel
· Overall Height:
o Minimum: 0.585"
o Maximum: 0.635"
· Overall Diameter: (Widest Point): 1.185"
· Color: Black w/ Gold
· No need to worry about thread size, Designed placement without screws
· The easiest to use vibration isolation spikes ever designed!!