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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:

 (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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Summary of Contents for KF852E

Page 1: ...izontal 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 shal...

Page 2: ... 5 00 2 63 26 38 FRONT TOP 9 5 42 00 MOUNTING POINTS 3 8 16 NUTS WELDED TO A 2 x 2 STEEL PLATE KF852EF 35 50 13 00 3 91 29 91 NOTE MOUNTING POINTS ARE RECESSED MULTI POINT AIR CRAFT SEAT FLY TRACK ATTACHED VERTICALLY AND HORIZONTALLY TO THE CABINET S ALUMINUM INTERNAL STRUCTURAL BRACES 19 00 BOTTOM 7 00 BACK SIDES 2 25 29 50 16 50 29 50 FRONT 26 38 TOP 9 5 42 00 MID 1 MID 2 HIGH KF 852EP NO MADE I...

Page 3: ...ctave KF852E with MX800i 852E Beamwidth vs Frequency K B 0 20 40 60 80 100 120 140 200 1000 10000 dB SPL Frequency Hz Fundamental at 1 Power raised 10 dB 2nd Harmonic at 1 Power raised 10 dB 3rd Harmonic at 1 Power raised 10 dB Fundamental at 10 Power 2nd Harmonic at 10 Power 3rd Harmonic at 10 Power KF852E with MX800i 852E Harmonic Content K B Freq Hor Q Ver Q Tot Q Hor Beamwidth Ver Beamwidth 10...

Page 4: ... 10000 Attenuation in dB Frequency Hz Vertical 10 degrees Vertical 10 degrees KF852E with MX800i 852E Vertical 10 K B 20 10 0 10 200 1000 10000 Attenuation in dB Frequency Hz Horizontal 20 degrees Horizontal 20 degrees KF852E with MX800i 852Ei Horizontal 20 K B 20 10 0 10 200 1000 10000 Attenuation in dB Frequency Hz Vertical 20 degrees Vertical 20 degrees KF852E with MX800i 852E Vertical 20 K B 2...

Page 5: ...P Horizontal 1 3 Octave Polar Data KF852E 0 30 60 90 120 150 180 210 240 270 300 330 100 125 160 200 K B 0 30 60 90 120 150 180 210 240 270 300 330 1600 2000 2500 3150 K B 0 30 60 90 120 150 180 210 240 270 300 330 630 800 1000 1250 K B 0 30 60 90 120 150 180 210 240 270 300 330 10000 12500 16000 20000 K B 0 30 60 90 120 150 180 210 240 270 300 330 4000 5000 6300 8000 K B 0 30 60 90 120 150 180 21...

Page 6: ... P Vertical 1 3 Octave Polar Data KF852E 0 30 60 90 120 150 180 210 240 270 300 330 100 125 160 200 K B 0 30 60 90 120 150 180 210 240 270 300 330 1600 2000 2500 3150 K B 0 30 60 90 120 150 180 210 240 270 300 330 10000 12500 16000 20000 K B 0 30 60 90 120 150 180 210 240 270 300 330 630 800 1000 1250 K B 0 30 60 90 120 150 180 210 240 270 300 330 250 315 400 500 K B 0 30 60 90 120 150 180 210 240...

Page 7: ...6158 Toll Free 800 992 5013 Fax 508 234 8251 BBS 800 889 2540 A C O U S T I C ALPERFORMANCEPA R T N E R S H I P 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 125 Hz Horizontal Octave Polar Data 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 250 Hz Horizontal Octave Polar Data Horizontal Octave Polar Data KF852E ...

Page 8: ...158 Toll Free 800 992 5013 Fax 508 234 8251 BBS 800 889 2540 A C O U S T I C ALPERFORMANCEPA R T N E R S H I P 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 500 Hz Horizontal Octave Polar Data 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 1000 Hz Horizontal Octave Polar Data Horizontal Octave Polar Data KF852E ...

Page 9: ...158 Toll Free 800 992 5013 Fax 508 234 8251 BBS 800 889 2540 A C O U S T I C ALPERFORMANCEPA R T N E R S H I P 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 2000Hz Horizontal Octave Polar Data 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 4000 Hz Horizontal Octave Polar Data Horizontal Octave Polar Data KF852E ...

Page 10: ...158 Toll Free 800 992 5013 Fax 508 234 8251 BBS 800 889 2540 A C O U S T I C ALPERFORMANCEPA R T N E R S H I P 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 8000 Hz Horizontal Octave Polar Data 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 16000 Hz Horizontal Octave Polar Data Horizontal Octave Polar Data KF852E ...

Page 11: ...34 6158 Toll Free 800 992 5013 Fax 508 234 8251 BBS 800 889 2540 A C O U S T I C ALPERFORMANCEPA R T N E R S H I P 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 125 Hz Vertical Octave Polar Data 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 250 Hz Vertical Octave Polar Data Vertical Octave Polar Data KF852E ...

Page 12: ...34 6158 Toll Free 800 992 5013 Fax 508 234 8251 BBS 800 889 2540 A C O U S T I C ALPERFORMANCEPA R T N E R S H I P 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 500 Hz Vertical Octave Polar Data 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 1000 Hz Vertical Octave Polar Data Vertical Octave Polar Data KF852E ...

Page 13: ...4 6158 Toll Free 800 992 5013 Fax 508 234 8251 BBS 800 889 2540 A C O U S T I C ALPERFORMANCEPA R T N E R S H I P 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 2000 Hz Vertical Octave Polar Data 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 4000 Hz Vertical Octave Polar Data Vertical Octave Polar Data KF852E ...

Page 14: ...4 6158 Toll Free 800 992 5013 Fax 508 234 8251 BBS 800 889 2540 A C O U S T I C ALPERFORMANCEPA R T N E R S H I P 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852 8000 Hz Vertical Octave Polar Data 0 30 60 90 120 150 180 210 240 270 300 330 K B KF852E 16000 Hz Vertical Octave Polar Data Vertical Octave Polar Data KF852E ...

Page 15: ... Off Mode LF Dynamic Boost with R9 6 0 dB 50 Hz R11 475 Ohms 1 2 Parametric EQ 11 dB 3500 Hz B 9 R12 2 49k 1 2 Off Mode Fixed LF Hi Pass with R13 3 dB 40 Hz R13 12 7k 1 2 SB Fixed Boost 6 0 dB 35 Hz R1 5 23k 3 4 LF Phase 100k 22nF 1456 Hz R2 7 68k 3 4 SB Gain 4 7 dB R3 2 21k 3 4 SB Gain 4 7 dB R4 115k 3 4 SB Threshold 1 0 V R5 7 15k 3 4 LF Gain 3 5 dB R6 2 87k 3 4 LF Gain 3 5 dB R7 21 0k 3 4 SB Ph...

Page 16: ...524 USA Phone 508 234 6158 Toll Free 800 992 5013 Fax 508 234 8251 BBS 800 889 2540 A C O U S T I C ALPERFORMANCEPA R T N E R S H I P 40 20 0 20 20 100 1000 10000 20000 dB SPL Frequency Hz HF EQ IN HF EQ OUT MF LF SB ADJ LF SB OFF LF SB DIST SB MX800i 852E CCEP Configuration K B Configuration Data KF852E ...

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