Here is a description of what I did some years ago...
Massive and rigid speaker stands are much in vogue today,
precipitated by the desire to minimize relative motion of the speaker and
listener. I have largely overcome this
relative motion by mounting the speaker stands directly into the granitic
bedrock underlying the listening building.
An expanse of about two acres of solid granite was selected as the site
for the listening building and all topsoil was removed from the area. Four
mounting holes for the stands of each speaker were then drilled to a depth of
seven feet into the bedrock and stainless steel supports were press fit into
the drill holes. Glues and cements were
rejected as interfering with coupling of the stands and bedrock; instead, the
supports were cooled to cryogenic temperatures to shrink them. Expansion locked the supports in place as
they warmed to room temperature.
Speakers sit atop the supports on diamond points. I am currently contemplating the use of large
counterweights from a drawbridge to clamp the speakers securely to the
supports.
Despite the considerable attention given to speaker
movement, no provisions have heretofore been made for isolating the listener's
head. As "all motion is
relative", I elected to purchase a head and jaw clamp assembly from a
retiring brain surgeon. This is mounted
to bedrock as described above and provides a secure and stable support for the
listener's head. An ancillary benefit is
that it completely prevents any jaw motion during serious listening, thereby
eliminating changes in the shape of the ear canal documented by psychoacoustic
studies.
