EAW KF940 User manual

EasternAcoustic Works One Main Street 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
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
bottomoftheaudiblespectrum.
To provide the 13-foot horn length needed for the desired
enclosure size, EAW Engineers used advaced, bent rather than
foldedhorntechnology.Foldingcreatessharpcornersthatdonot
allow the expanding sound wave front to maneuver well above
certainfrequencies.Thisreducesoutputandincreases 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
theSuperSubimposes.
For portability, the KF940 includes balance-optimized handles
andaheavyduty,casterpalletthatboltstoitsrear.
TheKF940isappropriateforanyapplicationrequiringextremely
high output levels of sub bass information. Relatively small
SuperSub™arrays have successfullyfilled the largeststadiums
andarenaswithhighimpact,sub bass information. Applications
include stadiums concert tours, nightclubs, raves, dance clubs,
housesofworship,corporateA/V,and theatres.
The KF940 is designed to be used with today's sophisticated
digitalsignalprocessingtooptimizetheLFresponse.EAW'sMX
Series processors are recommended for the required crossover
andequalization. SixYearWarranty.
DUAL 12 INCH HORN SUBWOOFER
See NOTES TABULAR DATA for details, half space = floor-mounted
CONFIGURATION
Subsystem Transducer Loading
SUB 2x12 in cone Horn-loaded
Operating Mode AmplifierChannels ExternalSignalProcessing
Single-amp LF1/LF2 DSPw/1-wayfilter
Dual-amp LF1,LF2 DSPw/1-wayfilter
PERFORMANCE 1
Operating Range 23Hz to 185 Hz
Nominal Beamwidth
Horz 360°
Vert 360°
Axial Sensitivity (SPL)
LF1/LF2(whole space) 106dB 22 Hzto 173 Hz
(halfspace) 116 dB 22Hz to 173Hz
4xKF940 (whole space) 110 dB 22Hz 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
HighPass =>24 Hz, 12 dB/octaveButterworth
Accelerated Life Test 2
System LF1/LF2 80V 1600W @ 4 ohm
LF1,LF2 80 V (each) 800W @ 8 ohm (each)
Transducer(AES) 1000 W (each)
CalculatedAxial Output Limit (SPL)
Average Peak
LF1/LF2(whole space)138dB 144 dB
(halfspace) 148 dB 154 dB
4xKF940 (whole space) 142dB 148 dB
ORDERING DATA
Description Part Number
KF940Dual 12 inch Subwoofer Black 510655
(CasterPallet included)
OptionalAccessories
None
1Toachieve specifiedperformance, thelisted externalsignal processing with EAW-provided settings is required.
2Forrecommendations toselect power amplifier size refer to : “HOWMUCHAMPLIFIERPOWER DOI NEED?”on theEAWweb site.
(shownwithout grille)

EasternAcoustic Works One Main Street 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 Balticbirch plywood
Finish Wearresistanttextured black paint
Grille Powder-coatedperforated steel
58.25
52.00
2.10
6X 10.81
NOTES:
1. SYMBOL INDICATES NON-LOAD BEARING MOUNTING POINT,
3/8-16 THREADED HOLE. (FOR CASTER PALLET)
2. SYMBOL INDICATES CENTER OF BALANCE.
3. WEIGHT APPROX. 376.00 lb [169.2 kg]
4. SHIPPING WEIGHT APPROX. 411.00 lb [185.0 kg]
[53.3]
RIGHT SIDE
11.56
4X 25.78
KF940
ACCESS PANEL
LEFT SIDE
L
C
FRONT
6X 6.44
C
L
[6X 163.5]
6.37
32.75
4X 8.75
[4X 222.3]
4X SMALL HANDLES
13.75
4X 6.44
DIMENSIONS APPLY
TO TOP AND BOTTOM
TOP
4X CASTER
Ø 7.00 [177.8] SWIVEL
[4X 163.5]
[349.3]
[4X 654.8]
[831.9]
2X GRILLE
PARTIALLY
SHOWN
[161.9]
[293.7]
2X 19.38
1.56
5.63
2X 25.00
32.00 2X 7.19
[635.0]
[2X 182.6]
(HANDLE)
PRODUCTION
[6X 274.6] [812.8]
EASTERN ACOUSTIC W ORKS
7.38
BACK
INPUT
[492.3]
[143.0]
L
C
[187.5]
4X LARGE
HANDLES
HIDDEN BY
CASTER
PALLET
2X LARGE
HANDLES
[1320.8]
[1479.5] 2X 21.06
36.00
19.38
29.00
[492.3]
[2X 535.0]
(HANDLE)
C
L
[736.6]
[914.4]
[39.6]
NOTES: Thisdrawinghas beenreduced.Do notscale.
ForWPversion, add0.25 in/6.4 mm to theoutsidedimensions = 0.125in/ 3.2mmall around.

EasternAcoustic Works One Main Street 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 DATA
See NOTES GRAPHIC DATAfor 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
010 100 1000 20000
Frequency (Hz)
DI

EasternAcoustic Works One Main Street 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 PANEL
LF 1
LF 1
...
...
+
--
LF 2
LF 2
...
...
+
--
NEUTRIK
NL 4 MPR
NEUTRIK
NEUTRIK
NL 4 MPR
NEUTRIK
PIN 1+
--
PIN 1
PIN 2 +
--
PIN 2
KF940
S/N
WHITINSVILLE, MA USA
NOTES
TABULAR DATA
1. Measurement/DataProcessingSystems: Primary-FChart: proprietaryEAWsoftware;Secondary - Brüel&Kjær 2012.
2. MicrophoneSystems: EarthworksM30; Brüel&Kjær 4133
3. Measurements: DualchannelFFT;length:32 768 samples;sample rate: 48kHz;logarithmic sinewavesweep.
4.Measurement System Qualification(includesall uncertainties):SPL:accuracy+/-0.2dB @ 1kHz, precision +/-0.5dB20 Hzto20 kHz,resolution0.05 dB;Frequency:accuracy +/-1 %,
precision+/-0.1Hz,resolution the largerof1.5Hz or 1/48octave;Time:accuracy+/-10.4µs,precision +/-0.5µs,resolution10.4 µs;Angular:accuracy+/-1°,precision+/-0.5°, resolution 0.5°.
5. Environment: Measurementstime-widowedandprocessed toeliminateroom effects,approximating ananechoicenvironment. Data processed asanechoic orfractionalspace,as noted.
6. MeasurementDistance: 7.46m.Acousticresponsesrepresentcomplex summation of thesubsystems at20m.SPLisreferencedtootherdistancesusingtheInverseSquareLaw.
7. Volts: Measuredrmsvalue ofthetest signal.
8. Watts: Per audioindustry practice, “loudspeakerwatts”arecalculated asvoltagesquareddivided byratednominal impedance. Thus, theseare notTrueWattunitsofenergyas definedby
InternationalStandard.
9. SPL: (SoundPressureLevel) Equivalenttothe averagelevelof a signalreferenced to 0dBSPL=20 microPascals.
10.Subsystem: Thisliststhe transducer(s)andtheir acousticloadingfor each passband.Sub= Subwoofer,LF=Low Frequency,MF=MidFrequency,HF= HighFrequency.
11.Operating Mode: Userselectableconfigurations.Betweensystemelements,acomma(,)=separateamplifierchannels;aslash (/) = singleamplifierchannel.DSP=DigitalSignalProcessor.
IMPORTANT:Toachievethe specified performance,thelisted externalsignalprocessing mustbeused with EAW-providedsettings.
12.Operating Range: Range wheretheprocessed FrequencyResponsestayswithin -10 dBSPLofthepower averagedSPLwithinthisrange;measured onthegeometric axis.Narrowband
dipsareexcepted.
13.Nominal Beamwidth: Designanglefor the-6dB SPLpoints,referenced to 0dB SPLasthe highestlevel.
14.AxialSensitivity: PoweraveragedSPLovertheOperating Rangewithan input voltagethatwould produce 1Wat thenominalimpedance; measuredwithno externalprocessingon the
geometricaxis,referenced to1m.
15.Nominal Impedance: Selected 4,8,or 16ohmresistancesuch that theminimum impedance pointisno morethan20% belowthisresistanceover the OperatingRange.
16.High Pass Filter: Thishelpsprotectthe loudspeakerfromexcessive input signallevels at frequenciesbelowthe OperatingRange.
17.AcceleratedLifeTest: System: Maximumtestinput voltageappliedwithan EIA-426Bdefinedspectrum; measured withspecified signal processing;Transducer:AES2-1984R1997.
18.CalculatedAxialOutput Limit: Highest average andpeakSPLs possibleduringtheAcceleratedLifeTest. ThePeakSPLrepresentsthe2:1(6 dB)crestfactor of theLifeTestsignal.
GRAPHICDATA
1.Resolution:Toremoveinsignificant finedetails,1/12octavecepstralsmoothing wasappliedto acoustic frequencyresponses and 1/3octavecepstralsmoothing was appliedto the
beamwidthandimpedancedata. Othergraphs areplottedusing rawdata.
2.Frequency Responses: Variationinacoustic output level withfrequencyforaconstantinputsignal.Processed:normalizedto0dBSPL.Unprocessedinputs:2V(4ohm nominal impedance),
2.83V(8 ohmnominalimpedance), or4V (16 ohmnominalimpedance) referencedtoa distanceof1m.
3.Processor Response: The variationinoutput level withfrequency for aconstantinputsignal of0.775V =0dB reference.
4.Impedance: Variationin impedance magnitude,inohms, withfrequencywithout regardtovoltage/currentphase.This means theimpedancevalues maynot
beusedto calculateTrueWatts(see8above).
DSP
EQ
HPF
LPF
1-Way, Single-Amp (LF1/LF2)
LF
AMP
LF
DSP
EQ
HPF
LPF
AMP
1-Way, Dual-Amp (LF1, LF2)
LF
AMP LF
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 PowerAmplifier.
XVR: Passive LPFs, HPFs, and EQ integral to the loudspeaker.
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