ESS Performance series Specifications Page 5
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SPEAKER
PLACEMENT
A speaker's room placement and its orientation to the listener
can have a major bearing on the quality of sound you hear.
The proper functioning
of
the passive radiator at the rear
of
the model 5 & 8 requires that these speakers be placed
no
closer than one inch from the wall. Maximum bass perfor-
mance will probably occur with the speaker placed 3 to 5
inches from the wall. Because the passive radiator
is
located
in
the front of the model 4, that speaker
may
be placed di-
against a rear wall. Aside from not placing the models
5 or 8 directly against the rear wall, you will probably want
to
experiment with room placement
if
your room and furnish-
ings
do
not limit placement possibilities.
Generally, optimal stereo imaging
is
obtained by placing both
speakers along one plane, parallel to each other about five
to
eight feet apart. If the speaker
is
a bookshelf configuration,
placing the speakers
on
the floor, near comers, will aug.ment
bass response but might tend
to
make the bass "overpower"
the rest of the speaker.
If
the bass seems excessive, try mov-
ing the speaker away from the corner or try elevating the
speakers a
few
inches off the tloor.
The furnishings in your room can also importantly affect how
your speakers sound. Large windows, paneled walls and
wooden floor and/or ceilings are characteristic of
"live"
rooms. Ideally, highly retlective surfaces are acoustically
optimized by opposite absorptive surfaces. Heavily draped,
upholstered and carpeted rooms lacking any retlective
sur-
faces tend
to
be
acoustically non-reverberant or
"dead".
Rooms with a balance between reflective surfaces tend
to
be
most acoustically ideal.
If
possible, experiment with speaker
and decor placement to obtain a sound quality that you find
pleasing.
COMPONENTS
MIDRANGE/HIGH FREQUENCY:
The Heil Air-Motion Transformer
Unlike the
Performance Series Heil driver, conventional
midrange and high frequency drivers are highly susceptible
to
diaphragm resonance. When a cone, for instance,
is
driven
at
certain frequencies, it begins to change shape "in sym-
pathy" with the drive frequency. This vibration, known
as
diaphragm resonance, absorbs energy, blunting transient
at-
tack and causing overhang. Moreover, when another signal
is
introduced at the same time the resonating diaphragm tight-
ens up, like a rubber band stretched between two points. This
forces the resonating frequency to rise
in
frequency. This
change in frequency is a major factor
in
"masking" clarity
due to pitch variation.
One way to avoid resonance
is
to
make the diaphragm abso-
lutely rigid. Unfortunately, this.entails making the diaphragm
massive and difficult to drive.
A more effeetive way
to
avoid resonance
is
found in the
concept of distributed drive. When a driving force
is
distri-
buted uniformly over a diaphragm's moving surface area,
it
supports the diaphragm; the diaphragm is thereby effectively
made rigid without extra weight. Resonant vibrations simply
do not occur.
The diaphragm of the Heil air-motion transformer incorpo-
rates both concepts. Its surface area
is
folded into deep verti-
cal pleats. Conductive aluminum strips bonded to the pleat
walls move with the electronic signal, causing the pleats to
close or open along their entire length.
As the pleats expand or contract, air
is
sucked
in
or forced out
the open end. The pleat walls move only one fifth as far
as
the
escaping air, thus reducing the possibility
of
flexing. The
air-motion transformation ratio
is
thus 5 to
1.
The Heil's pleat action has two major advantages over con-
ventional methods. First,
it
eliminates the possibility
of
dia-
phragm resonance. Since the Heil's pleat walls are totally
drive-supported by the aluminum strips, they cannot bend out
of
shape to go into resonance. Second, when the Heil's deep
pleats force the air out, they move the air much
farther-
and
faster - than they themselves move creating a large, high
velocity air motion from a short, diaphragm move-
ment.
This
is
important because
it
drastically reduces the effeetive
moving mass of the diaphragm. The Heil builds up only a
fraction
of
the momentum generated by conventional one-
to-one drivers, transferring energy
to
the air efficiently at
all
frequencies.
The Heil transformer's pleated configuration has the added
advantage of spectacular dispersion by virtue
of
its small
radiating source. Conventional speakers reproducing similar
frequencies are usually so wide by comparison that sound
waves from one side
of
the disphragm interfere with waves
on the other side, narrowing the speaker's clean output to a
constricted central beam. This makes speaker placement ex-
tremely critical. The Hei! air-motion transformer avoids this
side cancellation because of its compact configuration. With
a
120"
horizontal pattern
of
20,000 Hz, the Heil maintains a
solid expanse of stereo imagery to frequencies beyond audi-
bility. A spacious sound stage can be enjoyed from virtually
any
point in the listening field.
Definitive clarity, freedom from resonance, and full-range
sound dispersion the inherent benefits
of
superior design.
For conventional speakers, they remain problematic goals.
- Perf()rmance 1
- CONTENTS 2
- INTRODUCTION 3
- CONNECTING YOUR SPEAKERS 3
- +") 4
- SPEAKER 5
- PLACEMENT 5
- SPECIFICATIONS 6
- MODEL 5 MODEL 8 7
- I"~ 8
- If you plan 9
- LIMITED THREE-YEAR 10
- WARRANTY 10
- IMPORTANT 11
- ;:'),inc 12
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