5
TAD Reference One Owner’s Manual
Beryllium Diaphragms
Each TAD Reference One loudspeaker features
proprietary beryllium-manufacturing technology for
the midrange and tweeter diaphragms. The lightest
and most rigid metal available for diaphragms,
beryllium performs with strength and damping
characteristics unmatched by any of the materials
currently used in high-end audio loudspeaker
manufacturing, as shown in Figure 1. Beryllium’s
combination of light weight and exceptional strength
enables diaphragm resonance to be pushed far beyond
the operating band of its drive units. This produces
near-perfect piston behavior in the speakers, resulting
in cleaner sound and greater accuracy of reproduction.
CST
The heart of the system is the Coherent Source
Transducer (CST), shown in Figure 2. The tweeter
diaphragm is mounted concentrically within the apex
of the midrange cone and provides a point source of
sound from 250 Hz to 100 kHz. It is time coherent,
due to the shallow midrange-cone profile made
possible by the superior strength of beryllium, and
produces a superbly-controlled radiation pattern. CST
ensures a perfect spectral balance between the direct
and reflected sounds that arrive at the listener’s ears,
providing a more consistent sound throughout the
listening room and improved imaging capability.
TECHNOLOGY
18 000
V
elocity (m/s)
I
nner Loss
16 000
14 000
12 000
10 000
8 000
6 000
4 000
2 000
0.005
0.015
0.025
0
Figure 1. Velocity properties of beryllium and
other materials.
Figure 2. The TAD Reference One’s Coherent
Source Transducer
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