Hybrid Audio Technologies Legatia Pro - Manual (Page 6)

Legatia Pro User’s Manual ©Hybrid Audio Technologies Page 6 of 43
and definition. As noted above, the Legatia Pro midrange drivers include a proprietary hybrid
Japanese cotton fine fabric diaphragm with extremely low moving mass. The fine fabric dome is
widely acknowledged as the best-damping material in the dome geometry format, as it provides the
near optimum balance of strength and weight. The fabric dome is critical to tame unwanted dome
modes, resonances, and the classic “breakup” associated with most composite materials.
All Legatia Pro designs offer an outstanding extended frequency response; the usable frequency
range of the Legatia Pro midrange drivers is at least six full octaves with proper installation, aiming,
set-up, and tuning. And because of the employed dome technology which boasts exceptional off-axis
response, described above, all Legatia Pro drivers offer exceptional off-axis bandwidth as well,
exceeding five octaves for all designs.
The Legatia L1 Pro tweeter utilizes a fine silk dome for the ultimate in music reproduction.
Suspension
All Legatia Pro midrange drivers include a reverse-roll fine treated cloth surround terminated in one
piece to the diaphragm, which is highly consistent, and does not suffer the variance of natural
rubbers. The surround and diaphragm in concert terminate mechanical vibrations well, having a low
stiffness for positive damping of resonances. The surround termination of the dome diaphragm,
which acts as an air seal between the dome and the tuned chamber, is the predominant mechanical
restoring force of the speaker. Another function of the surround-terminated diaphragm is to absorb
dome flexure waves as they are transferred up the diaphragm. You'll also know a Legatia Pro
midrange design by its integrated acoustically-transparent grille.
Housing and Tuned Chamber
All Legatia Pro-series products boast a fully machined aluminum body; the body is machined
aluminum, not cast aluminum. The dense metal structure of the tweeter and midrange housing helps
to reduce resonances within the body of the driver for effective reproduction of extremely low music
tones. The dome topology better approximates a true monopole than a similarly-sized cone midrange,
especially in the lower one third of its frequency response. Notably, what also makes the L3 Pro a
very good approximation of a true monopole is the fact that the flange/body of the driver is solid
machined aluminum, void of interstitial spaces, which terminates resonances well. Hybrid Audio
Technologies is likely the only company to produce a super high-end dome midrange, paying
attention to the critical function of the housing in modal damping.
In addition to the aluminum body of the Pro-series drivers, all Pro-series drivers include a cast
polypropylene tuned and damped chamber at the rear of the motor assembly; the chamber helps to
reduce backwave distortion and significantly lower the Pro-series driver’s resonance frequency to
allow it to be used to play tones near its resonance frequency. A machined aluminum knurled
attachment nut at the base of the Pro-series product provides optimized clamping strength to the
mounting media, and important feature for terminating modal distortion at the mounting baffle.