A high purity copper sleeve is used for the pole piece. This greatly improves the electrical conductivity of the copper sleeve for lower coil inductance and thus greater high frequency output at 15 kHz and above. The copper sleeved pole quickly wicks away heat generated by the coil and contributes in reduction of dynamic power compression. To compensate for the higher reluctance gap caused by the use of a copper sleeved pole piece, large magnet area was used in conjunction with special
The Phasing plug is of JBL’s traditional Rapid Flare, Coherent Wave
The diaphragm is formed of pure Beryllium foil that is manufactured with a proprietary, high temperature and pressure forming process. This process enables the proprietary integrated JBL diamond surround to be formed as one piece with the dome. Compared to other methods, forming the diaphragms out of sheets of Beryllium foil yields greater reliability and resistance against failures due to fatigue. If breakage ever does occur, the diaphragm does not shatter into pieces or harmful dust. Beryllium has a stiffness
JBL’s diamond pattern surround is utilized to maintain proper control and tuning of the second diaphragm resonance (the surround resonance mode). The proper control and placement of this surround resonance is critical for good high frequency shape, extension, and level.
