High Efficiency Speaker Asylum

Posted by wgeiger (i) on May 03, 2001 at 19:17:55

In Reply to: HF Compression driver -- Beyma? B&C? Selenium? posted by Kramer on May 03, 2001 at 01:21:14:

K,

IMO, TAD compression drivers are a bargain for the performance they deliver. Any HF compression driver that does not use a beryllium diaphragm, does so for one reason, cost savings. The keys to the HF performance kingdom are:

1) Internal sound propagation velocity (along with diameter, it determines at what frequency the onset of diaphragm breakup modes occur)

2) Mass per unit area – for a given stiffness (determines the severity of diaphragm breakup and the ultimate [Fh] of the driver due to diaphragm mass.

Diaphragm Mechanical Properties
Metal: Beryllium (Be) / Titanium (Ti)
Sound Velocity: 13000 / 4140 m/sec
Density: 1848 / 4507 kg/cu.m
Rigidity Modulus: 132 / 44 GPa
Young’s Modulus: 287 / 116 GPa

Regards,

WHG