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5 The Technology
The Genesis 1.2 comprises four columns: two midrange/tweeter
“wings” and two bass towers. Each module is 7ft 3in tall (221cm), and
covered in fine rare-wood veneers.
The dipole midrange/tweeter column houses a 75-inch line source
ribbon midrange, and twenty-six ribbon tweeters in a line-source array.
Each bass tower houses twelve 12” aluminum cone woofers, each
pair of woofers servo-controlled with its own 500 watt bass amplifier.
The complete Genesis 1.2 system weighs in at over 2,000 lbs
(900kg).
5.1 Design Philosophy: Dipolar Line Source
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 loudspeaker 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, an ideal line-source is much
easier to mechanize than the ideal point
source. The line-source (if large
enough), can approach the ideal, and in
doing so, provide sufficient radiating
area for dynamically and spatially
realistic sound reproduction.
The Genesis 1.2 is a near perfect line-source that is over 7 feet tall
(nearly the room’s entire height). A 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)
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Audio Specifications
Weight and Dimensions
