EAW KF940 User Manual

Eastern Acoustic Works One Main S treet Whitinsville, MA01588 tel [phone] fax [phone] www.eaw .com

EAW products are continually improved. All specifications are therefore subject to change without notice. Part Number: RD0353 (A) KF940 June 2005

KF940 Specifications group · S

DESCRIPTION

• Extraordinary impact

• High efficiency

•

Extended response

The KF940 is a horn loaded subwoofer that provides output
levels, frequency response extension, and efficiency completly
out of proprotion to its size. Widely known as the SuperSub™,
The KF940 is engineerd to be used in arrays of four or more to
produce extremely high output sub bass response to the very
bottom of the audible spectrum.

To provide the 13-foot horn length needed for the desired
enclosure size, EAW Engineers used advaced, bent rather than
folded horn technology . Folding creates sharp corners that do not
allow the expanding sound wave front to maneuver well above
certain frequencies. This reduces output and increases distortion
through air turbulence. Bending instead of folding allows all
frequencies to easily pass without interference. This minimizes
size without minimizing sound quality and output. The two 12-in
drivers are specially designed to endure the extreme conditions
the SuperSub imposes.

For portability, the KF940 includes balance-optimized handles
and a heavy duty , caster pallet that bolts to its rear .

The KF940 is appropriate for any application requiring extremely
high output levels of sub bass information. Relatively small
SuperSub™ arrays have successfully filled the largest stadiums
and arenas with high impact, sub bass information. Applications
include stadiums concert tours, nightclubs, raves, dance clubs,
houses of worship, corporate A/V , and theatres.

The KF940 is designed to be used with today's sophisticated
digital signal processing to optimize the LF response. EAW's MX
Series processors are recommended for the required crossover
and equalization. Six Y ear Warranty .

DUAL 12 INCH HORN SUBWOOFER

See NOTES T ABULAR DATAfor details, half space = floor-mounted

CONFIGURA TION

Subsystem

Transducer Loading

SUB 2x 12 in cone Horn-loaded

Operating Mode

Amplifier Channels External Signal Processing

Single-amp LF1/ LF2 DSPw/1-way filter

Dual-amp LF1, LF2 DSPw/1-way filter

PERFORMANCE

1

Operating Range 23 Hz to 185 Hz
Nominal Beamwidth

Horz 360°

Vert 360°

Axial Sensitivity (SPL)

LF1/LF2 (whole space) 106 dB 22 Hz to 173 Hz

(half space) 116 dB 22 Hz to 173 Hz
4x KF940 (whole space)1 10 dB 22 Hz to 185 Hz
Input Impedance (ohms)

Nominal Minimum

LF1/ LF2 4 4.5 @ 35 Hz
LF1, LF2 8 (each) 9.1 @ 33 Hz (each)

High Pass Filter

High Pass =>24 Hz, 12 dB/octave Butterworth

Accelerated Life Test

2

System LF1/LF2 80 V 1600 W @ 4 ohm

LF1, LF2 80 V (each) 800 W @ 8 ohm (each)

Transducer (AES) 1000 W (each)

Calculated Axial Output Limit (SPL)

Average Peak

LF1/LF2 (whole space)138 dB 144 dB

(half space) 148 dB 154 dB
4x KF940 (whole space) 142 dB 148 dB

ORDERING DA T A

Description Part Number

KF940 Dual 12 inch Subwoofer Black 510655
(Caster Pallet included)

Optional Accessories

None

1 To achieve specified performance, the listed external signal processing with EAW-provided settings is required.
2 For recommendations to select power amplifier size refer to : “HOW MUCH AMPLIFIER POWER DO I NEED?” on the EAW web site.

(shown without grille)

Eastern Acoustic Works One Main S treet Whitinsville, MA01588 tel [phone] fax [phone] www.eaw .com

EAW products are continually improved. All specifications are therefore subject to change without notice. Part Number: RD0353 (A) KF940 June 2005

KF940 Specifications group · S

ENCLOSURE

Material Baltic birch plywood

Finish Wear resistant textured black paint

Grille Powder-coated perforated steel

NOTES: This drawing has been reduced. Do not scale.
For WPversion, add 0.25 in / 6.4 mm to the outside dimensions = 0.125 in / 3.2 mm all around.

[492.3]

1.56

[39.6]

L

29.00

36.00

[736.6]

[914.4]

2X 21.06

[2X 535.0]

4X LARGE

(HANDLE)

HANDLES

19.38

[492.3]

HIDDEN BY

CASTER

C

PALLET

2X 19.38

L

C

[635.0]

2X 25.00

5.63

[143.0]

INPUT

7.38

[187.5]

BACK

2X 7.19

[2X 182.6]

32.00

EASTERN ACOUSTIC WORKS

(HANDLE)

PRODUCTION

HANDLES

2X LARGE

58.25

52.00

[1320.8]

[1479.5]

2.10

[53.3]

L

C

11.56

3/8-16 THREADED HOLE. (FOR CASTER PALLET)

1. SYMBOL INDICATES NON-LOAD BEARING MOUNTING POINT,

2. SYMBOL INDICATES CENTER OF BALANCE.

3. WEIGHT APPROX. 376.00 lb [169.2 kg]

NOTES:

4X SMALL HANDLES

32.75

[831.9]

4. SHIPPING WEIGHT APPROX. 411.00 lb [185.0 kg]

6.37

[161.9]

4X 8.75

[4X 222.3]

[293.7]

2X GRILLE

PARTIALLY

SHOWN

4X 25.78

[4X 654.8]

6X 10.81

[6X 274.6] [812.8]

6X 6.44

[6X 163.5]

RIGHT SIDE

FRONT

TOP

ACCESS PANEL

DIMENSIONS APPLY

TO TOP AND BOTTOM

4X 6.44

[4X 163.5]

4X CASTER

13.75

[349.3]

Ø 7.00 [177.8] SWIVEL

L

C

LEFT SIDE

KF940

Eastern Acoustic Works One Main S treet Whitinsville, MA01588 tel [phone] fax [phone] www.eaw .com

EAW products are continually improved. All specifications are therefore subject to change without notice. Part Number: RD0353 (A) KF940 June 2005

KF940 Specifications group · S

PERFORMANCE DA T A

See NOTES GRAPHIC DA TAfor details

Frequency Response: Processed

Whole Space 1x = green, 2x2 = blue

SPL(dB)

Frequency Response: Unprocessed

Whole Space 1x = green, 2x2 = blue

SPL(dB)

Frequency Response: Digital Signal Processor

1x = green, 2x2 = blue

dB re 0.775 V

Impedance Magnitude

LF1/2 = green LF1, LF 2 (each) = orange

Ohms

120

110

100

90

80

70

60

100

10

1

10 100 1000 20000

Frequency (Hz)

10

0

-10

-20

-30

-40

-50

20

10

0

-10

-20

-30

-40

10 100 1000 20000

Frequency (Hz)

10 100 1000 20000

Frequency (Hz)

10 100 1000 20000

Frequency (Hz)

Directivity Index: Processed

1x = green, 2x2 = blue

30

20

10

0

10 100 1000 20000

Frequency (Hz)

DI

Eastern Acoustic Works One Main S treet Whitinsville, MA01588 tel [phone] fax [phone] www.eaw .com

EAW products are continually improved. All specifications are therefore subject to change without notice. Part Number: RD0353 (A) KF940 June 2005

KF940 Specifications group · S

INPUT P ANEL

NOTES

TABULAR DA T A

1. Measurement/Data Processing Systems: Primary - FChart: proprietary EA W software;Secondary - Brüel & Kjær 2012.

2. Microphone Systems: Earthworks M30; Brüel & Kjær 4133

3. Measurements: Dual channel FFT; length: 32 768 samples; sample rate: 48 kHz; logarithmic sine wave sweep.

4. Measurement System Qualification (includes all uncertainties):SPL: accuracy +/-0.2 dB @ 1 kHz, precision +/-0.5 dB 20 Hz to 20 kHz, resolution 0.05 dB; Frequency: accuracy +/-1 %,

precision +/-0.1 Hz, resolution the larger of 1.5 Hz or 1/48 octave; Time: accuracy +/-10.4 µs, precision +/-0.5 µs, resolution 10.4 µs; Angular: accuracy +/-1°, precision +/-0.5°, resolution 0.5°.

5. Environment: Measurements time-widowed and processed to eliminate room effects, approximating an anechoic environment. Data processed as anechoic or fractional space, as noted.

6. Measurement Distance: 7.46 m. Acoustic responses represent complex summation of the subsystems at 20 m. SPLis referenced to other distances using the Inverse Square Law.

7. Volts: Measured rms value of the test signal.

8. Watts: Per audio industry practice, “loudspeaker watts” are calculated as voltage squared divided by rated nominal impedance. Thus, these are not True W att units of energy as defined by

International Standard.

9. SPL: (Sound Pressure Level) Equivalent to the average level of a signal referenced to 0 dB SPL = 20 microPascals.

10. Subsystem: This lists the transducer(s) and their acoustic loading for each passband. Sub = Subwoofer, LF = Low Frequency, MF = Mid Frequency , HF = High Frequency .

11. Operating Mode: User selectable configurations. Between system elements, a comma (,) = separate amplifier channels; a slash (/) = single amplifier channel. DSP= Digital Signal Processor.

IMPORTANT: T o achieve the specified performance, the listed external signal processing must be used with EA W-provided settings.

12. Operating Range: Range where the processed Frequency Response stays within -10 dB SPL of the power averaged SPLwithin this range; measured on the geometric axis. Narrow band
dips are excepted.

13. Nominal Beamwidth: Design angle for the -6 dB SPL point s, referenced to 0 dB SPLas the highest level.

14. Axial Sensitivity: Power averaged SPLover the Operating Range with an input voltage that would produce 1 W at the nominal impedance; measured with no external processing on the

geometric axis, referenced to 1 m.

15. Nominal Impedance: Selected 4, 8, or 16 ohm resistance such that the minimum impedance point is no more than 20% below this resistance over the Operating Range.

16. High Pass Filter: This helps protect the loudspeaker from excessive input signal levels at frequencies below the Operating Range.

17. Accelerated Life T est: System: Maximum test input voltage applied with an EIA-426B defined spectrum; measured with specified signal processing; Transducer: AES2-1984 R 1997.

18. Calculated Axial Output Limit: Highest average and peak SPLs possible during the Accelerated Life T est. The Peak SPLrepresents the 2:1 (6 dB) crest factor of the Life Test signal.

GRAPHIC DAT A

1. Resolution:To remove insignificant fine details, 1/12 octave cepstral smoothing was applied to acoustic frequency responses and 1/3 octave cep stral smoothing was applied to the

beamwidth and impedance data. Other graphs are plotted using raw data.

2. Frequency Responses:Variation in acoustic output level with frequency for a constant input signal. Processed: normalized to 0 dB SPL. Unprocessed inputs: 2 V (4 ohm nominal impedance),

2.83 V (8 ohm nominal impedance), or 4 V (16 ohm nominal impedance) referenced to a distance of 1 m.

3. Processor Response:The variation in output level with frequency for a constant input signal of 0.775 V = 0 dB reference.

4. Impedance: Variation in impedance magnitude, in ohms, with frequency without regard to voltage/current phase. This means the impedance values may not

be used to calculate True Watt s (see 8 above).

SIGNAL DIAGRAM

LEGEND

DSP: User-supplied Digital Signal Processor.
HPF: High Pass Filter for crossover or specified High Pass Filter.
LPF: Low Pass Filter for crossover.
LF/MF/HF: Low Frequency / Mid Frequency / High Frequency.
AMP: User-supplied Power Amplifier .
XVR: Passive LPFs, HPFs, and EQ integral to the loudspeaker.

WHITINSVILLE, MA USA

KF940

S/N

PIN 1+

PIN 1

NEUTRIK

NEUTRIK

NL 4 MPR

PIN 2

+

LF 1

...

--

PIN 2

--

LF 1

...

NEUTRIK

NEUTRIK

NL 4 MPR

1-Way, Single-Amp (LF1/LF2)

DSP

EQ

HPF

AMP

LPF

+

LF 2

...

+

--

LF 2

...

--

1-Way, Dual-Amp (LF1, LF2)

DSP

AMP

EQ
HPF
LPF

AMP

LF

LF

LF

LF