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the directivity control formerly associated only
with large-format constant-directivity horns used
in "traditional," two-way arrays crossed over at
500 Hz.
The PI series provides uniform directivity con-
trol down to 500
Hz,
because the mouth dimen-
sions of both the mid-bass and high-frequency
horns were correctly chosen and are large
enough with respect to the wavelengths repro-
duced to do so. The PI
series'
superior direc-
tivity control increases speech intelligibility and
musical clarity in difficult acoustic environments.
Other three-way systems with smaller radi-
ating areas simply cannot provide the high
degree of directional control associated with
the PI series.
The PI6615 and the other models in the
PI series were specifically designed with the
contractor and sound system consultant in
mind.
The PI series allows the designer to customize
his system to suit any acoustic environment.
The PI6615 is a
60°
x
60°
three-way full-range
module for triamp application
.
The mid-bass
and high-frequency horns are coaxially mounted
and are easily rotated together, allowing the
horizontal and vertical coverage patterns to be
interchanged. The common acoustic axes of
the mid-bass and high-frequency horns ensure
smooth response and coverage in the cross-
over region when the appropriate signal delay
is applied to the high-frequency driver.The horn-
loaded bass section incorporates an EVX-150A
38 .1-cm (15-in.) woofer for maximum output
and
reliability.
The combination of rotatable
horns and trapezoidal enclosure shape allows
easy construction of circular and spherical
ar-
rays. The angled enclosure sides allow ceiling
mounting with a reduced vertical profile and an
aiming angle that is inherently in the general
direction of the audience. The enclosure is
made of black painted, multilayer plywood and
includes certified flying hardware as standard.
Delivering smooth and extended
performance,
the high-frequency section operates from 1 ,600
to 20,000 Hz and
consists of
a specially
developed
,
low-profile DH2As2 compression
driver coupled to an HP66
60°
x
60°
constant-
directivity horn. The HP66 horn features inte-
gral fiberglass-and-zinc construction for excep-
tional strength and performance. Beamwidth-
control vanes in the horn throat correct all
coverage anomalies in the 10- to 20-kHz oc-
tave
.
This horn and driver combination is se-
curely mounted to the mid-bass horn by a
heavy-duty steel bracket.
The mid-bass system is composed
of a
DL 1 OX-SH 24.5-cm (1 O-in .) reproducer
mounted on an MH660
60°
x
60°
mid-bass
horn. The DL 1 OX-SH reproducer contains a
Kevlar'"
epoxy cone
,
which is twice as strong as
the conventional paper cone.
'
The mid-bass
section operates between 160 and 1 ,600 Hz,
and features a proprietary phase plug (U
.S.
patent
no.
4,718,517) which extends the high-
end output to blend seamlessly into the coaxial
high-frequency section
.
The low-frequency section operates between
50 and 160 Hz and has been designed for
superior performance
,
in the air as well as on
the ground. The EVX-150A woofer can handle
very large levels of input
power,
producing high
acoustic output with relatively low distortion
and closely matching the high output levels of
1.
Kevla'" is a reg istered
trademark
of
Dupont.
the high- and mid-frequency
sections.
The PI6615 is equipped with a number of addi-
tional features to make operation and
installa-
tion easy and
secure.
A proprietary structural
extrusion is incorporated into the enclosure,
providing safe and flexible suspension (see
Suspending PI6615 section). Up to two enclo-
sures (from any of the PI series family) can be
suspended without additional
support,
so ar-
rays can be created quickly and easily. The
mid-bass/high-frequency module can be ro-
tated easily on site within the trapezoidal enclo-
sure, allowing for an infinite combination of
coverage angles and patterns. The two grilles
are composed of vibration-resistant steel for
excellent driver protection, and they can be
painted to blend into any environment. The
enclosure can also be painted using ordinary
paints.
All wiring on the PI6615 mid-bass/high-
frequency module is integral and rotates with
the horns, so wiring errors are
minimized;
all
drivers can be serviced from the front of the
enclosure
.
The
P16615,
in its standard form
,
is
intended for use
indoors.
Do not use outdoors.
APPLICATIONS
The PI6615 and the PI series of products have
been designed specifically with the permanent
installation market in
mind.
Sports
arenas,
per-
forming arts
centers,
auditoriums and large
gymnasiums are all candidates for the PI6615
and the entire PI line. The unique modular
construction and optimized bass performance
combined with superior directivity control result
in a system that can be used in almost any
situation. The concert-sound pedigree of the PI
series is evident by the ease of installation and
by the use of professional-grade components
throughout the
line.
SUSPENDING PI6615 ENCLOSURES
Suspending any object is potentially danger-
ous and should only be attempted by individu-
als who have
a
thorough knowledge of the
techniques and regulations of rigging objects
overhead.
Electro- Voice strongly recommends
that the PI6615 be suspended taking into
ac-
count all current
national, federal,
state and
local
regulations.
It is the responsibility of the
installer to ensure the PI6615 is safely installed
in accordance with all such regulations.
If
the
PI6615 is
suspended,
Electro-Voice strongly
recommends that the system be inspected at
least once a
year.
If
any sign of weakness or
damage is
detected,
remedial action should be
taken immediately.
A manual entitled Installing the PI Series is
available from Electro-Voice
.
It is included with
every PI system and should be followed care-
fully. A general overview is included here to
help the system designer. This overview does
not replace the Installing the PI Series
manual,
which includes additional information on sus-
pending,
configuring and equalizing the PI se-
ries
.
The PI series enclosures are suspended using
the following approach
,
which has been ap-
proved by an independent structural
engineer.
Every enclosure incorporates eight indepen-
dent suspension
points,
four on the top and four
on the bottom
.
A minimum of four points must
be used at all times to suspend the enclosure
.
The suspension
points,
which
"tie"
the top and
sides of the enclosure
together,
are made of
2. For
additional inform
ation,
contact
Anc ra
International
at
606/371-7272 or
toll
free (within the U.S. only) at
8001233-5 138.
structural aluminum
.
Each suspension point
mates to an Ancra 42546-10 locking
fitting2
(four of which are supplied with every enclo-
sure), and each point has a break strength of
907 kg (2 ,000 Ib) in any direction. A maximum
of two enclosures can be
"daisy-chained"
to-
gether, allowing the construction of vertical
arrays. If longer arrays are required
,
provision
must be made to independently suspend each
enclosure. The Ancra 42546-1 0 fitting incorpo-
rates a safety pin to prevent accidental release
,
and it should be engaged at all
times.
CAUTION: The PI6615 speaker systems
should be suspended overhead only in ac-
cordance with the procedures and limita-
tions specified in the installation manual
included with the systems.
MODULE ROTATION
The mid-bass/high-frequency module can be
rotated through
90°
(see Figure 5) by the follow-
ing
procedure:
1. Remove the mid/high grille assembly by
removing the black hole caps (Item A) and
then, using a Phillips
screwdriver,
remov-
ing the four 10-24 screws (Item
B).
2.
Remove the four 1/4-20 hex-head screws
(Item C) from the back of the enclosure
.
3. Using a Phillips
screwdriver,
remove six-
teen 10-24 screws (Item D) from around the
horn rim. The enclosure may be laid on its
back at this time for easiest
servicing;
how-
ever,
this is not strictly necessary.
4. Pull the mid-bass/high-frequency module
(Item
E)
forward and rotate through
90°.
5.
Relocate the mid/high-frequency module in
the steel nest. In some circumstances, it
may be necessary to loosen the steel nest
to relocate the module.
6. Reverse the procedure to reassemble the
system.
Screws should be tightened down
firmly,
but do not overtighten
.
CONNECTIONS
Each frequency section can be individually
connected via #10 screw terminals. The mid-
and high-frequency connections are located
together on the back at the top of the
enclosure.
The low-frequency connection is located sepa-
rately
,
on the back at the bottom of the enclo-
sure.
All drivers are connected with the same
polarity.
A positive voltage applied to the posi-
tively marked terminal produces a positive
acoustic pressure at the front of the system.
CROSSOVER, EQ AND SIGNAL DELAY
The PI6615 is a three-way system which must
be triamped with a separate active
crossover,
capable of supplying 24-dB-per-octave cross-
over slopes, constant-directivity horn
EO,
and
signal delay.
The Electro-Voice Dx34 Digital Sound System
Processor has been pre-programmed with pre-
sets for each member of the PI
line.
Great care
has been
ta~en
to optimize the directional re-
sponse through
crossover,
and to ensure that
cabinets with different coverage patterns will
sound the same on axis, as well as summing
optimally,
off
axis.
If an Electro-Voice XEO-3 electronic cross-
over/equalizer/delay unit is used, the EOW
plug-in module will provide appropriate horn
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