EAW KF853 Technical Specifications

Preliminary Product Information

APPLICATIONS

The KF853 Virtual Array ® System is a long-throw two way horn-loaded
loudspeaker designed to cover the frequency range from 200Hz to
17kHz. The frequency response of this system is optimized to compen-
sate for atmospheric attenuation of high frequencies over long distances.
The large vertical dimension of the midrange horn allows for excellent
pattern control down to the lowest frequencies of operation. Dual 10"
midrange drivers offer peak output levels of up to 147 dB at 1 meter.
EAW's new proprietary ferrofluid cooled CD5003 high frequency com-
pression driver provides high output with extremely low distortion.
The KF853 has been specifically engineered to operate in conjunction
with the BH853 long-throw horn-loaded mid-bass system as the long-
throw element of the KF850 "family". Other "family" members include:
the KF850 three-way system, KF852 mid-high system, BH852 horn-
loaded mid-bass system and the SB850 & SB1000 direct radiating sub-
woofers. Together, they form the elements of the KF850 Stadium Array
System. Arrays incorporating these loudspeaker systems are easily scal-
able from clubs and proscenium theaters to arenas, stadia and the larg-
est outdoor events.

SPECIFICATIONS

Frequency Response
1.5 db 200 to 17k Hz
-10 dB: 130 Hz
Efficiency / Axial Sensitivity
MF 1 W @ 1m: 118 dB SPL
HF 1 w @ 1m: 117 dB SPL
Impedance
MF/HF: 8
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: 147 dB SPL
HF Peak SPL: 140 dB SPL
MF Long Term: 142 dB SPL
HF Long Term: 135 dB SPL
Nominal Coverage Angles (-6 dB)
Horizontal: 40 degrees
Vertical: 30 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: MX8000-853
Finish: Black Catalyzed Polyurethane
Connectors: 1 ea. Male & Female Cannon AP6,
Banana Test Points
Rigging: 2 x Anchra Track, Top & Bottom;
Internal Subframe
Grill: Vinyl Coated Perforated Steel; Open
Cell Foam Backing
Dimensions & Weights
Height: 42.0 in
Width: 27.38 in (695 mm)
Depth: 25.5 in
Back Width: 15.5 in
Net Weight: 231 lbs
Shipping Weight: 246 lbs
EASTERN ACOUSTIC WORKS
Technical Specifications KF853
(Nominal)
(1066 mm)
(647 mm)
(394 mm)
(103.0 Kg)
(110.7 Kg)
One Main Street, Whitinsville, MA 01588 • (508) 234 - 6158 • FAX (508) 234 - 8251 • BBS (800) 889-2540
EAW products are continually improved. All specifications are therefore subject to change without notice. • PUB# KF853/C5/3/5/95

OTHER RELEVANT DOCUMENTS

• Group C Hardware Technical Specifications
• Group C Price Lists
• APP Testing Procedures*
•Weather Proofing Technical Specifications
• Structural/Mechanical Technical Specifications*

ARCHITECTURAL SPECS

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
1m) of 118 dB SPL (MF), 117 dB SPL (HF); 100 hour sine wave Power
Handling of 300 Watts (MF), 70 Watts (HF); Nominal horizontal cover-
age of 30 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 and equalization networks.
The loudspeaker enclosure shall be trapezoidal in shape and constructed
of 18mm thickness, void-free, cross-grain-laminated birch plywood and
shall include extensive internal bracing. It shall be finished in black cata-
lyzed polyurethane. All external hardware shall be stainless steel or alu-
minum 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. Heavy duty Aircraft Seat Track suspension points
shall be installed in the top and bottom of the enclosure. Aluminum
bar-stock shall connect the top and bottom suspension points.
The loudspeaker system shall be the KF853.
1.5 dB; Axial Sensitivity (1W @