Electro-Voice 848AT Specifications

General Product Description

Model 848AT 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 200 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 with phenolic-constructed inner horns.
The driver uses a high-temperature rated 1.5-inch diameter voice
coil.
The axial frequency response will extend from 260-10,000 Hz and
the horn shall exhibit a low-frequency cutoff of 200 Hz. Sound
pressure level will be 105 dB (1 W/1 M) with a 500-5,000-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. Other
major external speaker parts shall be die-cast zinc and finished in
gray polyester paint to match the molded horn parts. All components
Specifications:
Frequency Response:
..................................... 260-10,000 Hz ±5 dB (see Figure 3)
Power Handling, 8 Hours, 6 dB Crest Factor:
....................................... 30 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 500-5,000 Hz:
.................................................................................... 105 dB
Horizontal Beamwidth:
150° at 2 kHz (see Figure 2)
Vertical Beamwidth:
110° at 2 kHz (see Figure 2)
Directivity Factor R θ θ θ θ θ (Q):
........................................................................... 7.4 @ 2 kHz
Usable Low-Frequency Limit:
.................................................................................... 200 Hz
Compound Diffraction
Projector
shall be resistant to damage from weather, moisture and fungus.
A steel 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 54.6 cm (21.5 in.) long.
The loudspeaker shall be the 848AT, which includes a 70V/25V
transformer and weighs no more than 7.0 kg (15.5 lb).
Construction:
Large fiberglass compression molding with gray finish, front horn of
gray die-cast zinc and phenolic compression-molded innerhorns
with steel "U" bracket
Voice Coil Diameter:
.................................................................... 3.81 cm (1 .5 in.)
Magnet Weight:
...................................................................... 0.28 kg (0.62 lb)
Magnet Material:
...................................................................... Strontium ferrite
Flux Density:
...................................................................................... 1.25 T
Dimensions,
Height: .......................................................... 52 cm (20.5 in.)
Width: ......................................................... 26.5 cm (10.5 in.)
Depth: ............................................................ 51 cm (20.0 in.)
Net Weight:
....................................................................... 7.0 kg (16.0 lb)
Shipping Weight:
....................................................................... 8.2 kg (18.0 lb)
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