EAW KF940 User Manual

Eastern Acoustic Works One Main S treet Whitinsville, MA01588 tel 800 992 5013 / 508 234 6158 fax 508 234 8251 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
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 800 992 5013 / 508 234 6158 fax 508 234 8251 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 800 992 5013 / 508 234 6158 fax 508 234 8251 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 800 992 5013 / 508 234 6158 fax 508 234 8251 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
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