Other reasons for the superior performance of idler drive turntables are
related to the effect of gravity waves on two loosely coupled masses that
exist in belt drive turntables, namely, the platter and the motor. Because
these are loosely coupled, the spatial distortion caused by gravity waves
propagates along the belt in a nonlinear fashion. This can be demonstrated
by use of a gold leaf electrometer to measure the differential charge
buildup between the platter and the motor. It has bee repeatably observed
that phonon quantitization of surface wave propagation along the surface of
the belt is distorted by this buildup. Idler drive turntables suffer no such
defect, due to the absence of a long freestanding surface to support phonon
quantitization.

In the case of the direct coupled turntable, quantitization of the magnetic
field occurs, but has not been explained. One possibility is isostatic
compression of the motor bearings due to micromolecular flattening of the
bearing contact points. Other possibilities include a bandgap quantitization
of the tribologic axis points, caused by adiabatic thermal distortion of the
motor structure. With the limited budget for turntable research, it is
doubtful the causes of progressive, aperiodic rumble in direct drive
turntables will be resolved.

One thing is clear: the idler drive turntable, by virtue of a simple and
proven mechanism, provides the ultimate in quality while mechanical analysis
stays completely within the classical realm. It is anticipated that with
further development, this design will result in vinyl reproduction that
exceeds in quality both SACD and DVD-A.

In conclusion: the future of the idler drive turntable has an unlimited
horizon.