Genesis Advanced Technologies 2JR - Manual (Page 18)

Ver 1.0 Sep 2011
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a bs o l u t e f i d e l i t y ®
The Technology
The Genesis 2.2 junior loudspeaker integrates a line-source
midrange/tweeter with point-source bass. Each speaker is over 6
feet tall, and the cabinet structured is designed to manage
vibrations and resonance. The tweeters and midrange ribbon are
mounted on a 1.5-inch slab of high-molecular weight cast acrylic,
and are isolated from the box containing two horizontally opposed
12” woofers.
Design Philosophy
Nothing has changed in theoretical acoustics since Lord Rayleigh’s
original book on acoustics published in 1877. There are still only
two proper ways for a transducer to propagate sound in a room: a
point source and a line source. Anything else, or everything in
between, is a compromise.
In order for all frequencies of
sound from the loudspeaker to
reach the listener at exactly the
same time, a coherent wave front
is important -
not just “time-
alignment” of drivers. The ideal is
either an infinitely small pulsating
point or a pulsating line with a size
on the order of the room
dimension.
Obviously, a line-source is much
easier to mechanize than the ideal
point source. The line-source (if
large enough), can approximate
the ideal, and in doing so, provide sufficient radiating area for
dynamically and spatially realistic sound reproduction.
The G2jr is a line-source that is 4 feet long (nearly the half the
room’s entire height) from 120Hz upwards. Very importantly, the
line source has no vertical dispersion at any frequency. Hence,
there is no sound bouncing from either the floor or the ceiling. No
deleterious interference from these surfaces is created (as in
virtually all other kinds of speakers).
John William Strutt Lord Rayleigh (1842 – 1919)