Electro-Voice 850T User manual

850T
Compound
Diffraction Horn
General Product Description
Model 850T is a wide-range, integrated horn and driver system
with a single driver unit having two coaxial horns coupled to opposite
sides of the driver diaphragm.
The folded construction of the rear horn coupled with the smaller
dimensions of the front horn, present a 1,000 Hz acoustic crossover.
This separation of frequencies provides a more extended
high-frequency response and cleaner sound.
The 150° horizontal by 110° vertical dispersion pattern is beneficial
in many applications requiring a wide coverage pattern. Furthermore,
excellent loading is maintained to a low-frequency cutoff of 180 Hz.
Architects’ and Engineers’ Specifications
The loudspeaker shall be of the integrated driver and horn style,
utilizing two coaxial horns coupled to opposite sides of the driver
diaphragm and a larger horn compression molded from fiberglass,
a zinc die-cast front horn and phenolic-constructed inner horns.
The driver uses a high-temperature rated 5.2 cm (2.0-inch) diameter
voice coil.
The axial frequency response will extend from 280 to 8,000 Hz and
the horn shall exhibit a low frequency cutoff of 180 Hz. Sound
pressure level will be 105 dB (1 W/1 M) with a 500 to 5,000 Hz pink
noise signal applied, and the horn will produce a horizontal
beamwidth of 150° and a vertical beamwidth of 110° at 2 kHz. The
horizontal coverage shall be constant over the frequency range of
3 kHz to 10 kHz.
The loudspeaker shall be compression molded fiberglass capable
of satisfactory mechanical performance in the temperature range
from - 40°C to +40°C and not subject to sunlight embrittlement.
Specifications:
Frequency Response:
........................................ 280-8,000 Hz ±5 dB (see Figure 3)
Power Handling, 8 Hours, 6 dB Crest Factor:
........................................ 60 watts (500-5,000 Hz pink noise)
Transformer Taps and Impedances:
............................................................................ See Table 1
Sound Pressure Level at 1 Meter, 1 Watt Input Averaged, Pink
Noise Band-Limited from 500 to 5,000 Hz:
..................................................................................... 105 dB
Horizontal Beamwidth:
150° @ 2 kHz (see Figure 2)
Vertical Beamwidth:
110° @ 2 kHz (see Figure 2)
Directivity Factor Rθ θ
θ θ
θ (Q):
............................................................................ 5.2 @ 2 kHz
Usable Low-Frequency Limit:
..................................................................................... 180 Hz
Construction:
Large fiberglass compression molding with gray finish, front horn of
gray die-cast zinc and phenolic compression-molded inner horns
with steel “U” bracket
Voice-Coil Diameter:
...................................................................... 5.08 cm (2.0 in.)
Magnet Weight:
...................................................................... 0.45 kg (1.00 lb)
Magnet Material:
...................................................................... Strontium ferrite
Flux Density:
................................................................................ 1.35 Tesla
Dimensions,
Height: ........................................................ 52.0 cm (20.5 in.)
Width: .......................................................... 26.5 cm (10.5 in.)
Length: ........................................................ 51.0 cm (20.0 in.)
Net Weight: .............................................................. 8.4 kg (19 lb)
Shipping Weight: .................................................. 9.5 kg (21.0 lb)
Other major external speaker parts shall be diecast zinc finished in
gray polyester paint to match the molded horn parts. All components
shall be resistant to damage from weather, moisture and fungus.
A swivel bracket capable of providing either vertical or horizontal
installation and a variety of adjustments, is provided.
The loudspeaker shall be 52.0 cm (20.5 in.) high, 26.5 cm (10.5 in.)
wide and 51.0 cm (20.0 in.) long. The loudspeaker shall be the
850T, which includes a 70-V transformer and weighs no more than
8.4 kg (19.0 lb).
COMMERCIAL

© Telex Communications, Inc. 02/2001
Part Number 38109-840 Rev A
U.S.A. and Canada only.
For customer orders, contact the Customer Service department at
800/392 3497 Fax: [phone]
For warranty repair or service information, contact the Service
Repair department at 800/685 2606
For technical assistance, contact Technical Support at 866/78 AUDIO
Please refer to the Engineering Data Sheet for warranty information.
Specifications subject to change without notice.
Installation
As shipped, the “U” bracket is in position for vertical mounting. For horizontal
dispersion, (or for mounts where the bracket mounting holes must be
vertical), move bracket to the rear mounting position. The horn can be
mounted in a variety of horizontal and vertical configurations by using
adjustments of the swivel connections (bracket to horn).
Polar Response
The directional characteristics of the 850T, with driver attached, were
measured by running a set of horizontal/vertical polar responses, in a large
anechoic chamber, at each one-third-octave center frequency.The test signal
was one-third-octave pseudo-random pink noise centered at the indicated
frequencies. The measurement microphone was placed 6.1 m (20 ft.) from
the horn mouth, while rotation was about the wave guide geometric apexes.
These axes of rotation are quite close to the apparent (acoustic) apexes
across the frequency range of measurement. Errors attributable to the slight
differences between the geometric and acoustic apexes are reduced to an
inconsequential level by the relatively long, 20-foot measuring distance.
The horn was suspended freely with no baffle. The polar plots shown in
Figure 1 display the results of these tests. The center frequency is noted on
each plot. The wider plot on each chart is the horizontal polar (-) and the
narrower plot is the vertical polar (- - -).
Beamwidth
A plot of the 850T’s 6 dB-down total included beamwidth angle is shown in
Figure 2 for each one-third-octave center frequency.
Frequency Response
Figure 3 shows the axial frequency response of the 850T. It was measured
at a distance of 1 meter, using a swept sine wave.
Transformer
A transformer and power selector switch are installed in the rear housing.
Power taps for the transformer are listed in Table 1.
Low-Frequency Driver Protection
When frequencies below the low-frequency cutoff for the horn assembly
are fed to the driver, excessive current may be drawn by the driver. For
protection of driver, amplifier, and transformer, capacitor(s) in series with
driver, or transformer primary are recommended. Table 1 (below) indicates
recommended values. The values shown are for 200 Hz. Values for other
frequencies can be determined by using the formula:
C = [C200 x 200 ]
C200 = Values shown in the following table
Figure 1
850T Polar Response
Figure 2
850T Beamwidth vs. Frequency
Figure 3
850T Frequency Response (1 watt at 1 meter)
f f = New Frequency
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USA 12000 Portland A e South, Burns ille, MN 55337, Phone: [phone], FAX: [phone]
Canada 705 Progress A enue, Unit 46,Scarborough, Ontario, Canada, M1H2X1,Phone: [phone], FAX: [phone]
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