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Beryllium is Superior

Posted by wgeiger (M) on July 28, 2002 at 12:27:16

In Reply to: compression drivers posted by jakeman on July 27, 2002 at 19:21:41:

JM,

There is no substitute for a well-designed beryllium diaphragm compression driver. In the case of TAD products, the cost of manufacturing the diaphragm and associated 5-annuli phase plug is of course unavoidable.

A good measure of the differences involved may be seen in the comparison of the mechanical properties of the elements beryllium and titanium:

Beryllium
Longitudinal Velocity (m/s) 12,900
Shear Velocity (m/s) 8,880
Acoustic Impedance (10^6 * kg/((m^2)*s) 23.5
Density (kg/m^3) 1848
Young’s modulus [/GPa]: 287
Rigidity modulus [/GPa]: 132
Bulk modulus [/GPa]: 130

Titanium
Longitudinal Velocity (m/s) 6,100
Shear Velocity (m/s) 3,120
Acoustic Impedance (10^6 * kg/((m^2)*s) 27.69
Density (kg/m^3) 4507
Young’s modulus [/GPa]: 116
Rigidity modulus [/GPa]: 44
Bulk modulus [/GPa]: 110

When comparing titanium diaphragm compression drivers, the performance of the McCauley 9620 should also be considered.

Regards,

WHG

• McCauley 9620   (Open in New Window)

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