Specifications
page 4
LOW
FREQCENCY
DRIVER
Different low frequency transducers are used
in
ESS Perfor-
mance Series speakers to complement cabinet size and the
Heil air-motion transformer. Each woofer utilizes a magnetic
circuit that critically damps the drivers moving assembly and
makes possible a flat frequency response over an extended
range. The model 4 woofer operated from 35
Hz
to the cross-
over point at 2400 Hz into the Heil amt. The range
of
the
slightly less massive model
5 and 8 bass drivers operate from
40
Hz
and 50 Hz respectively to the crossover point
of
2400
Hz.
SPECIFICATIONS
THE
PASSIVE RADIATOR
The 10" passive radiator on your ESS Performance Series
speaker
is
driven by the motional energy
of
the woofer. The
passive radiator works in the same way
as
a port except that
the velocity
of
the passive diaphragm
is
much lower than that
of
the air moving through a typical port. As a result, low
frequency distortion
is lower when using a passive radiator
system than when using a ported system.
In order to have the
same performance from a vent, the port would have to oc-
cupy the entire volume of a typical bookshelf system! Addi-
tionally, the passive radiator keeps the back radiation of the
woofer where it belongs: in a tuned system within the box.
FULL
SYSTEM MODEL 4
Power Capacity
160
Watts (clean power)
Nominal Impedance 6 Ohms
Dispersion
120
0
horizontal, 40° vertical
Crossover Frequency
2400
Hz
Efficiency
1 Watt input produces a 96 dB
of
sound pressure at a distance
of
3 feet, 82
dB
at
15
feet
Amplitude-Frequency Response 35
Hz
to
24
kHz ± 3 dB
HElL
AIR-MOTION TRANSFORMER
Total Radiating Area 10.4 sq. in. (67.1 cm
2
)
Transformation Ratio
5.3
to
1
Magnet Assembly Weight
21;4
Ibs. (1.02 kg)
Flux Density
6,000
Gauss
Square Wave Rise Time
15
Microseconds 5 kHz
LOW FREQUENCY DRIVER
Nominal Diameter
10
inches (25.40 cm)
Flux Density 11,800 Gauss
PASSIVE RADIATOR
Nominal Diameter
10
inches (25.40 cm)
DECOR
Finish Vinyl (Walnut)
Grille Color
Dark Brown
Dimensions
35
x
12%
x
12Vs
in. (88.9 x
31.75 x
30.8
COl)
WEIGHT
(Including Packing) 48 lbs. (22 kg)