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may be biamplified. Twelve 3/8 inch x
16 threaded mounting suspension
points (three each top and bottom and
two each sides and back) allow a
variety of suspension configurations.
Multiple units may be mounted to form
a vertical/horizontal array [see
limitations under mounting
instructions]. Both versions of the
ILS 1564 are solidly constructed of
3/4 inch void free poplar plywood and
finished with an exterior grade
hardened black paint.

Frequency Response

This measurement is useful in
determining how accurately a given
unit reproduces an input signal. The
frequency response of the ILS 1564
is measured at a distance of 1-meter
using a 1 watt (into the nominal
impedance) swept-sine input signal.
As shown in Figure 1, the selected
drivers in the ILS 1564 combine to
give a smooth frequency response
from 47 Hz - 18.5 kHz.

Directivity

Beamwidth is derived from the -6 dB
points from the polar plots (see Figure
3) which are measured in a whole
space anechoic environment. Q and
Directivity Index are plotted for the on-
axis measurement position. These are
specifications that provide a reference
to the coverage characteristics of the
unit. These parameters provide insight
for proper placement and installation
in the chosen environment. The
blending of the components of the ILS
1564 exhibit a desirable beamwidth
and directivity (Figure 3 and 4)
suitable for sound reinforcement
applications.

Power Handling

There are many different approaches
to power handling ratings. Peavey
rates this loudspeaker system’s power
handling using a full-range form of the
AES Standard 2-1984. Using audio
band 20 Hz to 20 kHz pink noise with
peaks of four times the RMS level,
this strenuous test signal assures the
user that every portion of this system
can withstand today’s high technology
music. This rating is contingent upon
having a minimum of 3 dB of amplifier
headroom available.

Harmonic Distortion

Second and third harmonic distortions
vs. frequency are plotted in Figures 5
and 6 for two power levels. Ten
percent (10%) of rated input power
and either one percent (1%) of rated
input power or one watt, whichever is
greater. Distortion is read from the
graph as the difference between the
fundamental signal (frequency
response) and the desired harmonic.
As an example, a distortion curve that
is down 40 dB from the fundamental
is equivalent to 1% distortion.

Mounting

CAUTION:

Before attempting to

suspend this speaker, consult a
certified structural engineer. Speaker
can fall from improper suspension,
resulting in serious injury and property
damage. Other enclosures may be
suspended below one ILS 1564.
However, the combined weight of
additional enclosures and all cables,
clamps and other hardware must not
exceed 304 pounds. The ILS 1564
weighs 96 pounds and the maximum
combined weight suspended from the
uppermost mounting bracket

assemblies must not exceed 400
pounds. Maximum enclosure angle
45 degrees. Use only the correct
mating hardware (forged shoulder
machinery eye bolt, Mil Spec
MIL51937-3). All associated rigging
is the responsibility of others.

Architectural and Engineering
Specifications

The loudspeaker system shall have
an operating bandwidth of 47 Hz -
18.5 kHz. The nominal output level
shall be 95.0 dB when measured at a
distance of one meter with an input of
one watt. The nominal impedance
shall be 8.0 ohms. The maximum
continuous power handling shall be
750 watts, maximum program power
of 1,500 watts and a peak power input
of at least 3,000 watts, with a
minimum amplifier headroom of 3 dB.
The nominal radiation geometry shall
be 70 degrees in the horizontal plane
and 65 degrees in the vertical plane.
The outside dimensions shall be
33.75 inches high by 19.38 inches
wide by 21.75 inches deep. The
weight shall be 96 pounds. The
loudspeaker system shall be an
Architectural Acoustics model
ILS 1564.