EAW KF853 Technical Specifications

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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 compen­sate 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 com­pression 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 long­throw element of the KF850 "family". Other "family" members include:
the KF850 three-way system, KF852 mid-high system, BH852 horn­loaded mid-bass system and the SB850 & SB1000 direct radiating sub­woofers. Together, they form the elements 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.

SPECIFICATIONS

Technical Specifications KF853

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 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: 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 (1066 mm)

Width: 27.38 in (695 mm)

Depth: 25.5 in (647 mm)
Back Width: 15.5 in (394 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*

•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 Fre­quency Response of 200 Hz to 17 kHz ± 1.5 dB; Axial Sensitivity (1W @
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 cover­age 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 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 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 cata­lyzed polyurethane. All external hardware shall be stainless steel or alu­minum 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.

EASTERN ACOUSTIC WORKS

One Main Street, Whitinsville, MA 01588 • (508) 234 - 6158 • FAX (508) 234 - 8251 • BBS [phone]

EAW products are continually improved. All specifications are therefore subject to change without notice. • PUB# KF853/C5/3/5/95

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DIMENSIONAL DRAWINGS

KF853

27.38

Drawings KF853

35.50

42.00

FRONT

15.50

BACK

INPUT PLATES

EASTERN ACOUSTIC WORKS

KF-853EF

NO.

MADE IN USA

Virtual Array

TECHNOLOGY

SIDES

15.50

6.11

35.50

27.38

6.34

19.25

10.41

TOP/BOTTOM

1

CANNON

--

PIN 5

+

PIN 6

5

6

2

4

3

HIGH

...

--

HIGH

...

+

1

5

6

234

TM

CANNON

PIN 1
PIN 2

...
...

LOW
LOW

--

PIN 3

MID

PIN 4

...

MID

...

+

Acoustic Performance Partnership Eastern Acoustic Works KF853 Page 2

One Main Street, Whitinsville MA, 01588 USA • Phone [phone] • Toll Free 800/992-5013 • Fax [phone] • BBS 800/889-2540

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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

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Performance Data KF853

DISTORTIONFREQUENCY RESPONSE

140

120

dB SPL

100

80

100 1000 10000 20000

KF853 with Processor Axial Response

KF853 Axial Response

Predicted Axial Response at

B

K

100 Feet (Normalized to 1 m)

Frequency (Hz)

Q & DIRECTIVITY INDEX (DI)

100

10

Q

1

200 1000 10000

KF853 with Processor Q and Directivity

Horizontal Q and Directivity (1/3 Octave)

Vertical Q and Directivity (1/3 Octave)

B

K

Total Q and Directivity (1/3 Octave)

Frequency (Hz)

BEAMWIDTH

KF853 with Processor Beamwidth vs Frequency

360
330
300

270

240

210
180
150

Degrees

120

90
60
30

0

200 1000 10000

Horizontal Beamwidth (1/3 Octave)

Vertical Beamwidth (1/3 Octave)

B

K

Frequency (Hz)

KF853 (with Processor) Harmonic Content

B

K

20
18
16
14
12
10
8
6
4
2
0

Q & BEAMWIDTH BY FREQUENCY

Freq Hor Q Ver Q Tot Q Hor Beamwidth Ver Beamwidth
200 4.6 4.1 4.5 127 130
250 4.8 4.3 4.6 119 126
315 6.2 5.8 6 101 102

Directivity Index

400 7.9 8.1 8.1 88 86
500 10.3 11.9 11.1 76 71
630 14 16 15.2 61 52
800 16.3 20.2 18.1 53 49
1000 22.1 38 27.9 49 37
1250 24.1 60.2 34.4 48 20
1600 20.8 25.8 23 48 46
2000 26.9 25.2 26 43 45
2500 29.3 31.4 30.9 38 37
3150 31.2 40.5 35.5 38 30
4000 39.8 53.9 45.9 33 25
5000 41.3 52.2 51.3 33 22
6300 43.9 53.9 54.4 34 23
8000 47.4 86.6 61.3 33 21
10000 47.7 42.1 56.7 32 18
12500 54.3 47.6 54 31 30
16000 41.9 85.3 56.2 36 23
20000 24.7 31.3 33.7 40 18

Acoustic Performance Partnership Eastern Acoustic Works KF853 Page 3

One Main Street, Whitinsville MA, 01588 USA • Phone [phone] • Toll Free 800/992-5013 • Fax [phone] • BBS 800/889-2540

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Performance Data KF853

HORIZONTAL OFF-AXIS RESPONSE VERTICAL OFF-AXIS RESPONSE

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

10

0

-10

-20

Attenuation in dB

-30
200 1000 10000

10

0

-10

-20

Attenuation in dB

-30
200 1000 10000

10

0

-10

-20

Attenuation in dB

-30
200 1000 10000

10

0

-10

-20

Attenuation in dB

-30
200 1000 10000

KF853 with Processor Horizontal ±10°

B

K

Horizontal +10 degrees

Horizontal -10 degrees

Frequency (Hz)

KF853 with Processor Horizontal ±20°

B

K

Horizontal +20 degrees

Horizontal -20 degrees

Frequency (Hz)

KF853 with Processor Horizontal ±30°

B

K

Horizontal +30 degrees

Horizontal -30 degrees

Frequency (Hz)

KF853 with Processor Horizontal ±40°

B

K

Frequency (Hz)

Horizontal +40 degrees

Horizontal -40 degrees

10

0

-10

-20

B

Attenuation in dB

-30
200 1000 10000

10

0

-10

-20

B

Attenuation in dB

-30
200 1000 10000

10

0

-10

-20

B

Attenuation in dB

-30
200 1000 10000

10

0

-10

-20

B

Attenuation in dB

-30
200 1000 10000

KF853 with Processor Vertical ±10°

Vertical +10 degrees

K

Vertical -10 degrees

Frequency (Hz)

KF853 with Processor Vertical ±20°

Vertical +20 degrees

K

Vertical -20 degrees

Frequency (Hz)

KF853 with Processor Vertical ±30°

K

Frequency (Hz)

KF853 with Processor Vertical ±40°

K

Frequency (Hz)

Vertical +30 degrees

Vertical -30 degrees

Vertical +40 degrees

Vertical -40 degrees

INPUT IMPEDANCE

KF853 with Processor

20

15

10

Ohms

5

0

20 100 1000 10000 20000

Bi-Amp Input Impedance (Magnitude)

B

K

Frequency (Hz)

MF/HF Bi-Amp Input Impedance (Magnitude)

LF Bi-Amp Input Impedance (Magnitude)

Acoustic Performance Partnership Eastern Acoustic Works KF853 Page 4

One Main Street, Whitinsville MA, 01588 USA • Phone [phone] • Toll Free 800/992-5013 • Fax [phone] • BBS 800/889-2540

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0°

30°

60°

90°

120°

150°

180°

210°

240°

270°

300°

330°

16000

20000

K

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Performance Data 2-Array KF853

KF853 2-ARRAY 1/3 OCTAVE HORIZONTAL POLARS

270°

300°

240°

B

300°

0°

330°

30°

1000

330°

1250

60°

1600

300°

2000

90°

120°

K

210°

330°

180°

0°

150°

30°

2500

270°

240°

B

K

210°

0°

180°

30°

150°

60°

120°

6300

8000

10000

12500

90°

3150

60°

4000

5000

270°

240°

B

K

210°

150°

90°

120°

180°

6 db/div.

KF853 Q & DIRECTIVITY KF853 BEAMWIDTH

100

10

Q

1
1000 10000 20000

KF853 (with processor) Q and Directivity

Q (Horizontal)

Directivity (Horizontal)

B

K

Frequency (Hz)

20
18
16
14
12
10
8

Directivity Index

6
4
2
0

210

180

150

120

90

Degrees

60

30

B

0

1000 10000 20000

K

KF853 (with processor) 

Horizontal Beamwidth vs Frequency

Frequency (Hz)

Acoustic Performance Partnership Eastern Acoustic Works KF853 Page 5

One Main Street, Whitinsville MA, 01588 USA • Phone [phone] • Toll Free 800/992-5013 • Fax [phone] • BBS 800/889-2540