Jamo D 7 SUB Owner/User Manual - Page 25

The large voice coil in combination with a powerful neodymium magnet, results in a very powerful motor, making the unit capable of high sound pressure level/power handling. The magnet is magnetically shielded. Woofer The 5½" was also developed specially for the D 7. The aluminium diaphragm material was chosen due to high rigidity and the fact that it is "airtight" (the air pressure inside the D 7 Woofer cabinet cannot penetrate the diaphragm). A pattern of small round stamps in the diaphragm makes it even more rigid. The basket is made from rigid and open-structured ABS. The ABS material features a higher internal damping than that of a conventional metal basket. The open structure of the basket, also behind the spider, ensures high airflow and prevents under/overpressure at low frequencies - allowing free and fast movement of the diaphragm. This becomes an extremely important feature as excursions of +/- 8 mm 15