As you know, any platform used for supporting Hi-Fi and AV equipment
needs to be stable, inert (resonant free) and level. We've all seen the
many solutions put forward in an effort to meet these
criteria- heavy materials, light materials, thick materials, thin
materials and even clamping equipment in mid-air within a
frame. All these methods work to a lesser or greater extent and
can be used to fine tune or tonally re-balance a system. An interesting
project which meets all the above criteria, is tunable and costs pennies
to put in place is outlined below.
The platform is based upon the energy absorbtion
characteristics exhibited by a gas under pressure- pneumatics.
You will need to obtain a quantity of, large bubble, bubble
wrap (9.53mm H X 25.4mm W), sandwiching a double
thickness between two pieces of either thick glass (10mm
minimum) or Medite (MDF) with cones placed on
the top and the bottom. Experience shows that the air
eventually leaks from the bubble wrap and so you will
periodically have to replace it- the heavier the equipment, the
more often you will need to do so. The fine tuning comes in to
play because if you use glass for the platform it will result in
a more forward presentation than if Medite were chosen. It is
worth trying both, or even a combination, to get the correct
Alternatively, use tennis balls cut in half- they aren t quite as
effective but are useful for heavier equipment.
The result of this minor piece of inexpensive DIY will be,
more detailed and dynamic presentation which will not harden
or become confused on transients. The CAD Air Sandwich.