Carver Woofer Operating Principle

Carver Woofer Operating principle
High sound pressure is required for achieving a rich bass. The Carver woofers (low range speakers) produce this sound pressure with their small diameter by increasing the displacement of the diaphragm. The sound pressure is produced by movement in the volume of air.
The volume of air moved is derived from the diaphragm area multiplied by the displace meet. To date to achieve this, the largest possible diaphragm area (diameter of the speaker) was used in conjunction with relatively low displacement (approximately 310 mm). A matching resonance volume is additionally required.
In vehicle construction applications, this technology leads to a conflict between vehicle design and vehicle equipment: Due to the design and comprehensive level of equipment, there is little package space available for large bass speakers.
Carver technology represents a new approach in solving this problem. Thanks to Carver technology, a high sound pressure is produced with a small speaker diameter by increasing the diaphragm displacement (approximately 30 mm).





Due to the greater diaphragm displacement Carver woofers (low range speakers) require a higher voltage supply than conventional speakers.
A special DSP amplifier with high voltage output stages (30 Vrms) is required for the Top-HiFi audio system. It is necessary to greatly increase the magnetic force in order to achieve greater diaphragm displacement. The solenoid was adapted accordingly. A high magnetic force also means that a high back emf is produced in the solenoid (back emf Uemf=B.I.v).
The back emf counteracts the output voltage of the amplifier thus reducing the effective voltage at the solenoid.
It is not possible to operate Carver speakers with the amplifiers (radio output stages 6 Vrms) previously used.