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C) The internal midrange chamber features non-
parallel internal surfaces that randomize stand-
ing waves, eliminating comb-filtering and
improving clarity and detail. The chamber is also
sized to the midrange driver so that it is acousti-
cally small (smaller in size than any of the wave-
lengths produced by the driver). This further
reduces the possibility of standing waves.
D) The small footprint of the Neodymium tweet-
er allows close placement to the midrange dri-
ver, improving mid-range coherence.
E) The tweeter is mounted to a solid aluminum
"Wonder Bar" that acts as a massive heatsink,
providing high power handling and less power
compression.
F) The Wonder Bar is mounted to the tweeter
from the rear of the cabinet, further increasing
cabinet rigidity.
11.2 What is "Virtual" Focused
Image Geometry?
NHT's hallmark for many years was a uniquely
angled cabinet which we described as having
Focused Image Geometry (F.I.G.). The angled
cabinet focused the mid-range and high fre-
quencies into the listening room and away from
room boundaries increasing the ratio of direct to
reflected sound. This resulted in loudspeakers
systems universally praised for their imaging
and detail over a wide listening area.
Evolution incorporates a "virtual" adaptation of
F.I.G.
Rather than an angled cabinet, we
increase the energy at the listening position
using the crossover.
When Evolution monitors are oriented vertically
and the tweeter is closest the inside edge of the
cabinet, the null created, at the crossover
frequency between the mid and high frequency
drivers is directed at the sidewalls. The graph
below shows the decrease in energy, aimed
towards the wall (C) compared to the direct
sound radiating at listening area (A & B). The
reduction in reflected sound improves detail and
provides a more 3-dimensional soundstage.
C
A
B
Television
A
C
B
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