Dimensions
Mounting the System in a Ceiling
Three hanging points are provided through the rear cover
consisting of 3/4-in. length of 3/8-16 threaded rod (“all-thread”) for
use with either the optional EBK-2 kit or by many other obtainable
hardware options that can utilize the 3/8-16 male thread.
It is imperative, before beginning the installation, to determine the
type of material employed in the ceiling to verify that it can safely
accommodate the weight of the system(s).
It is recommended to use all three hanging points with the optional
EBK-2 kit, which consists of three 3/8-16 eye-nuts which in turn
are screwed securely into each of the “all-thread” protruding through
the rear of the enclosure. From these points, the system can be
suspended from a girder, beam or appropriate ceiling fixture
depending on where the system is being used.
If the speaker system must be mounted inconspicuously, the system
can be suspended above a drop ceiling with an existing tile
replaced with the optional CG-1, 24-in. x 24-in. white powder-coated
perforated grille kit.
Selecting a Transformer Tap
The transformer tap of choice can be obtained by making
connection between the ground terminal (# 1) and any of the
wattage taps indicated on the input label. For the EP925-I00T, either
70-V or 100-V lines can be used. For the EP925-60T, either 25-V,
70-V or 100-V lines can be used — refer to the input panel label to
determine the appropriate wattage for the line voltage used.
Architects’ and Engineers’ Specifications
The loudspeaker systems shall be of the ceiling Duplex® type
consisting of a rear enclosure, front grille, transformer (for
transformer models) and 12-inch Duplex®
type loudspeaker. The
loudspeaker will feature a single high-frequency compression
driver coaxially mounted to a single 305-mm (12-in.) high-power
woofer using a 90° x 90° coverage pattern horn. The loudspeaker
system shall meet the following criteria: power handling shall be
250 watts of band-limited pink noise with 6 dB crest factor. Frequency
response shall be smooth and uniformly usable from 60 Hz to 20
kHz. Pressure sensitivity shall be 97 dB SPL when measured at one
meter on axis with one watt of pink noise.
The Duplex® ceiling loudspeaker packages shall be the Electo-
Voice® models EP925-60T with 60-watt transformer and
EP925-100T with 100-watt transformer.
Polar Response Charts
Wiring Diagrams
Harmonic Distortion
at 0.01 rated power (3.0 W)
5
Harmonic Distortion
at 0.1 rated power (30 W)
5
Transformer Specifications
EP925-60T:
Frequency Response:
......................... 60 Hz to 15 kHz, +/-1 dB
Insertion Loss:
.................................................................. <0.5 dB
Primary Voltage:
............................................................ 70.7 Vrms
Secondary Impedance:
............................................... 8-16 ohms
EP925-100T:
Frequency Response:
......................... 20 Hz to 20 kHz, +/-1 dB
Insertion Loss:
.................................................................. <0.5 dB
Primary Voltage:
............................................................ 70.7 Vrms
Secondary Impedance:
............................................... 8-16 ohms
Primary Impedance and Power Drawn:
EP925-60T
EP925-100T
667 ohms / 7.5 watt
99 ohms / 50.0 watt
333 ohms / 15.0 watt
71 ohms / 70.0 watt
166 ohms / 30.0 watt
50 ohms / 100 watt
83 ohms / 60.0 watt
36 ohms / 140 watt
25 ohms / 200 watt
Versions:
EP950-60T, EP950-I00T
