Monitor Audio Gold Reference GR20 Owner's Manual page 8

Spikes
The purpose of the 8 spikes in the toolbox is to effectively decouple
each loudspeaker from the floor. Properly adjusted (see Assembly), the
spikes improve bass definition and tightness and sharpen mid-range
focus. If you prefer not to have the spikes directly in contact with the
floor (wood or laminated surfaces, for instance), please use the 8
floor-protecting discs supplied. The top side has a cone recess to receive
the tip of the spike.
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© Monitor Audio Ltd 2001