Acoustic Performance Partnership
Eastern Acoustic Works
KF852 Page 1
One Main Street, Whitinsville MA, 01524 USA • Phone 508/234-6158 • Toll Free 800/992-5013 • Fax 508/234-8251 • BBS 800/889-2540
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Technical Specifications KF852E
APPLICATIONS
The KF852E Virtual Array
®
System is a two way horn-loaded loudspeaker
designed to cover the frequency range from 200Hz to 17kHz. The
large vertical dimension of the midrange horn allows for excellent pat-
tern control down to the lowest frequencies of operation. Dual 10"
midrange drivers offer peak output levels of up to 143dB at 1 meter.
EAW's proprietary ferrofluid cooled CD5002 high frequency compres-
sion driver provides high output with extremely low distortion.
The KF852E has been specifically engineered to complement the BH852
horn-loaded mid-bass system (shown at right beneath the KF852E) and
SB850 direct radiating subwoofer. All are designed to function as a part
of the KF850 Stadium Array System. Arrays incorporating these loud-
speaker systems are easily scalable from clubs and proscenium theaters
to arenas, stadia and the largest outdoor events.
The KF852E is available in two basic versions: the KF852EF intended for
portable use and the KF852EP which is optimized for use in permanent
installations.
ARCHITECTURAL SPECS
OTHER RELEVANT DOCUMENTS
• Group C Hardware Technical Specifications
• Group C Price Lists
• APP Testing Procedures*
• Water Proofing Technical Specifications
• Structural/Mechanical Technical Specifications*
The 2-way mid/high loudspeaker system shall incorporate two 10-inch
cone mid-frequency transducers and a 2 inch throat compression driver
mounted to a constant directivity HF horn. The system shall have Fre-
quency Response of 200 Hz to 17 kHz
±
1.5 dB; Axial Sensitivity (1W @
1m) of 114 dB SPL (MF), 112 dB SPL (HF); 100 hour sine wave Power
Handling of 300 Watts (MF), 70 Watts (HF); Nominal horizontal cover-
age of 55
°
between -6 dB points; Nominal vertical coverage of 40
°
between -6 dB points.
The system’s midrange drivers shall be loaded into a constant horizontal
coverage horn constructed of 3 mm cross-grain-laminated birch hard-
wood, reinforced with high density polyurethane foam and incorpo-
rating dual center displacement plugs. The high frequency driver shall
utilize a titanium diaphragm not less than 75 mm in diameter and in-
clude ferrofluid in the voicecoil gap to aid in cooling and damping.
Internal filters shall allow tri-amp operation and shall include driver pro-
tection networks.
The loudspeaker enclosure shall be trapezoidal in shape and constructed
of 18mm thickness void-free cross-grain-laminated birch plywood with
internal bracing. It shall be finished in black catalyzed polyurethane. All
external hardware shall be stainless steel or shall be coated to protect
against rust and corrosion. The front of the system shall be covered
with a perforated steel grill, coated with vinyl to dampen resonance
and backed with open cell foam to protect against dust. Hanging fix-
ture attachment points shall be installed in the top and bottom of the
enclosure.
The loudspeaker system shall be the KF853EF (KF852EP).
SPECIFICATIONS
Frequency Response
±
1.5 db
200 to 17k Hz
-10 dB:
130 Hz
Efficiency / Axial Sensitivity
MF 1 W @ 1m:
114 dB SPL
HF 1 w @ 1m:
112 dB SPL
Impedance
MF/HF:
8
Ω
(Nominal)
Power Handling
MF 100 hr. Sine Wave:
300 Watts
HF 100 hr. Sine Wave:
70 Watts
MF AES Standard:
800 Watts
HF AES Standard:
200 Watts
Maximum Output
MF Peak SPL:
143 dB SPL
HF Peak SPL:
135 dB SPL
MF Long Term:
138 dB SPL
HF Long Term:
130 dB SPL
Nominal Coverage Angles (-6 dB)
Horizontal:
55 degrees
Vertical:
40 degrees
Additional Descriptive Data
MF Subsystem:
2 x 10-in Cone; Horn Loaded
HF Subsystem:
1x 2-in Throat Compression Driver
On Constant Directivity Horn
Powering Mode:
Tri-Amp (LF component: BH852)
Standard Crossover:
MX800i-852E
Finish:
Black Catalyzed Polyurethane
"F" Connectors:
1 ea. Male & Female Cannon AP6,
Banana Test Points
"P" Connectors:
6 pin barrier strip, Banana Test Points
Rigging:
2 x AirCargo 20864 Track, Top &
Bottom; Internal Subframe
Grill:
Vinyl Coated Perforated Steel; Open
Cell Foam Backing
Dimensions & Weights
Height:
42.0 in
(1066.8 mm)
Width:
26.38 in (670 mm)
Depth:
29.5 in
(749.3 mm)
Back Width:
16.5 in
(419.1 mm)
Net Weight:
231 lbs
(103.0 Kg)
Shipping Weight:
246 lbs
(110.7 Kg)
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