A capacitor structure is provided. This is accomplished by powering the tip path and ring path amplifiers with a pair of transformer-coupled floating power supply-sourced voltages, and referencing respective like polarity inputs of the amplifiers to a differential voltage pair that is used to operate the subscriber loop, including providing loop current and controllably applying a ringing voltage to the POTS line. At least one support member is encapsulated within the walls and is formed from a different material to that of the walls and comprises a greater yield strength. Natural tones which have boosted bass tones and which are free from impurity are obtained. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way. The rods extend, with the shaft, outside of the toothed member.