EAW KF852E Technical Specifications

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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 pat­tern 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 compres­sion 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 loud­speaker 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.

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)

OTHER RELEVANT DOCUMENTS

• Group C Hardware Technical Specifications

• Group C Price Lists

• APP Testing Procedures*

• Water 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 Fre­quency 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 cover­age 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 hard­wood, reinforced with high density polyurethane foam and incorpo­rating dual center displacement plugs. The high frequency driver shall
utilize a titanium diaphragm not less than 75 mm in diameter and in­clude ferrofluid in the voicecoil gap to aid in cooling and damping.
Internal filters shall allow tri-amp operation and shall include driver pro­tection 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 fix­ture attachment points shall be installed in the top and bottom of the
enclosure.

The loudspeaker system shall be the KF853EF (KF852EP).

Acoustic Performance Partnership Eastern Acoustic Works KF852 Page 1

One Main Street, Whitinsville MA, 01524 USA • Phone [phone] • Toll Free 800/992-5013 • Fax [phone] • BBS 800/889-2540

M

-- +

MID 1 MID 2 HIGH

-- --++

KF-852EP

NO.

MADE IN USA

EASTERN ACOUSTIC WORKS

Virtual Array

TM

TECHNOLOGY

PIN 5

PIN 6

HIGH

HIGH

...

...

--

+

PIN 3

PIN 4

MID

MID

...

...

--

+

PIN 1

PIN 2

LOW

LOW

...

...

--

+

KF-852EF

NO.

MADE IN USA

EASTERN ACOUSTIC WORKS

Virtual Array

TM

TECHNOLOGY

CANNON

1

2

3

4

5

6

CANNON

1

2

3

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5

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Drawings KF852E

DIMENSIONAL DRAWINGS INPUT PLATES

KF852EP

42.00

26.38

FRONT

1.88

MOUNTING POINTS 3/8"-16 NUTS WELDED TO A 2"x 2" STEEL PLATE

ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED

29.50

13.00

2.00

38.00

2.35

2.00

5.38

SIDES

16.50

BACK

9.5°

8.25

13.58

2.63

5.00

2.38

21.88

2.63

5.00

20.90

TOP

BOTTOM

35.50

KF852EF





13.00

42.00

26.38

FRONT





NOTE:
MOUNTING POINTS 

ARE RECESSED 
MULTI- POINT AIR-
CRAFT SEAT FLY 
TRACK ATTACHED 
VERTICALLY AND 
HORIZONTALLY TO 
THE CABINET'S 
ALUMINUM INTERNAL 
STRUCTURAL BRACES.

29.50

TOP

29.50

SIDES

9.5°

16.50

BACK

2.25

19.00

29.91

BOTTOM

35.50

3.91

7.00

Acoustic Performance Partnership Eastern Acoustic Works KF852 Page 2

One Main Street, Whitinsville MA, 01524 USA • Phone [phone] • Toll Free 800/992-5013 • Fax [phone] • BBS 800/889-2540

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Performance Data KF852E

DISTORTIONFREQUENCY RESPONSE

120

100

dB SPL

80

60

KF852E with MX800i-852E Axial Response

B

K

100 1000 10000 20000

Frequency (Hz)

Q & DIRECTIVITY INDEX (DI)

100

Q

KF852E with MX800i-852E Q and Directivity

10

Horizontal Q and Directivity (1/3 Octave)

B

1

200 1000 10000

K

Vertical Q and Directivity (1/3 Octave)

Total Q and Directivity (1/3 Octave)

Frequency (Hz)

BEAMWIDTH

KF852E with MX800i-852E Beamwidth vs Frequency

360
330
300

270

240

210
180
150

Degrees

120

90
60
30

0

Horizontal Beamwidth (1/3 Octave)

Vertical Beamwidth (1/3 Octave)

B

K

200 1000 10000

Frequency (Hz)

20
18
16
14
12
10
8

Directivity Index

6
4
2
0

KF852E with MX800i-852E Harmonic Content

140

120

100

80

60

dB SPL

40

20

B

0

K

200 1000 10000

Fundamental at 1% Power (raised 10 dB)

2nd Harmonic at 1% Power (raised 10 dB)

3rd Harmonic at 1% Power (raised 10 dB)

Frequency (Hz)

Fundamental at 10% Power

2nd Harmonic at 10% Power

3rd Harmonic at 10% Power

Q & BEAMWIDTH BY FREQUENCY

Freq Hor Q Ver Q Tot Q Hor Beamwidth Ver Beamwidth
100 1.8 2 1.8 360 360
125 1.9 2.6 2.2 360 360
160 3.3 4.3 3.6 160 127
200 2.7 4.1 3.3 189 124
250 4.2 7.2 5.2 130 90
315 4.6 7.6 5.7 119 82
400 6.4 9 7.3 98 48
500 8.4 10 9.1 83 38
630 12.1 14.4 13.1 67 58
800 13.3 22.1 16.6 57 26
1000 12 23.5 15.9 69 25
1250 11 19.1 14 79 27
1600 7.9 12.4 9.9 81 69
2000 9.1 14.2 12.6 67 56
2500 10 21.3 16.8 58 45
3150 14.3 28.9 19.2 61 38
4000 23.3 33.3 27.4 51 36
5000 25.3 41.6 31.5 49 32
6300 23.1 50.4 31.7 53 28
8000 22.1 45.4 29.7 51 30
10000 16 44.1 26.4 56 34
12500 15 30.3 20.3 60 38
16000 14.8 37.2 20.3 63 34
20000 36.6 35.7 36.2 43 36

Acoustic Performance Partnership Eastern Acoustic Works KF852 Page 3

One Main Street, Whitinsville MA, 01524 USA • Phone [phone] • Toll Free 800/992-5013 • Fax [phone] • BBS 800/889-2540

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Performance Data KF852E

HORIZONTAL OFF-AXIS RESPONSE VERTICAL OFF-AXIS RESPONSE

On-axis response normalized to 0 dB. On-axis response normalized to 0 dB.

KF852E with MX800i-852E Horizontal ±10°

10

10

KF852E with MX800i-852E Vertical ±10°

0

-10

B

Attenuation in dB

-20

10

0

-10

Attenuation in dB

-20

10

0

-10

Attenuation in dB

-20

10

0

-10

Attenuation in dB

-20

K

200 1000 10000

KF852E with MX800i-852Ei Horizontal ±20°

B

K

200 1000 10000

KF852E with MX800i-852Ei Horizontal ±30°

B

K

200 1000 10000

KF852E with MX800i-852E Horizontal ±40°

B

K

200 1000 10000

Horizontal +10 degrees

Horizontal -10 degrees

Frequency (Hz)

Horizontal +20 degrees

Horizontal -20 degrees

Frequency (Hz)

Horizontal +30 degrees

Horizontal -30 degrees

Frequency (Hz)

Horizontal +40 degrees

Horizontal -40 degrees

Frequency (Hz)

0

-10

B

Attenuation in dB

-20

10

0

-10

Attenuation in dB

-20

10

0

-10

Attenuation in dB

-20
200 1000 10000

10

0

-10

Attenuation in dB

-20

K

200 1000 10000

KF852E with MX800i-852E Vertical ±20°

B

K

200 1000 10000

KF852E with MX800i-852E Vertical ±30°

B

K

KF852E with MX800i-852E Vertical ±40°

B

K

200 1000 10000

Vertical +10 degrees

Vertical -10 degrees

Frequency (Hz)

Vertical +20 degrees

Vertical -20 degrees

Frequency (Hz)

Vertical +30 degrees

Vertical -30 degrees

Frequency (Hz)

Vertical +40 degrees

Vertical -40 degrees

Frequency (Hz)

INPUT IMPEDANCE

KF852E with MX800i-852E

20

15

10

Ohms

5

0

20 100 1000 10000 20000

Acoustic Performance Partnership Eastern Acoustic Works KF852 Page 4

One Main Street, Whitinsville MA, 01524 USA • Phone [phone] • Toll Free 800/992-5013 • Fax [phone] • BBS 800/889-2540

Bi-Amp Input Impedance (Magnitude)

B

K

Frequency (Hz)

MF/HF Bi-Amp Input Impedance (Magnitude)

LF Bi-Amp Input Impedance (Magnitude)

M

0°

30°

60°

90°

120°

150°

180°

210°

240°

270°

300°

330°

1600

2000

2500

3150

K

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330°

Horizontal 1/3 Octave Polar Data KF852E

0°

30°

100

125

300°

60°

160

200

270°

270°

240°

B

300°

B

240°

K

K

210°

330°

210°

330°

180°

0°

180°

0°

150°

30°

150°

30°

120°

60°

120°

90°

90°

250

315

400

500

630

270°

300°

240°

B

K

330°

210°

330°

0°

180°

0°

30°

150°

30°

60°

120°

4000

5000

6300

8000

90°

10000

300°

270°

240°

B

K

210°

Acoustic Performance Partnership Eastern Acoustic Works KF852 Page 5

One Main Street, Whitinsville MA, 01524 USA • Phone [phone] • Toll Free 800/992-5013 • Fax [phone] • BBS 800/889-2540

180°

150°

60°

120°

90°

800

1000

1250

270°

300°

240°

B

12500

60°

16000

20000

90°

120°

K

210°

180°

150°