EAW KF740 Specifications

KF740 Specifications group • S

3WAY FULLRANGE LOUDSPEAKER

See NOTES TABULAR DATA for details

CONFIGURATION

Subsystem:

LF 4x 10-in cone Sealed, Phase Aligned

MF 2x 8-in cone Horn-loaded w/CSA™ Aperture

HF 2x 1.4-in exit, 2.5-in voice Horn-loaded

coil compression driver

Operating Mode:

Amplifier Channels External Signal Processing

Tri-amp LF, MF, HF DSP w/3-way filters

Transducer Loading

FEATURES

High output to size/weight ratio. Size and output capabilities allow it •
to be used in the widest variety of venues.
Exceptional pattern control due to symmetrical design, large horn(s) •
and spaced woofers.
Incorporates latest EAW technologies including CSA and Focusing for •
improved mid and high frequency transient response.
Fully compatible with KF760 and KF730 systems.•

DESCRIPTION

The KF740 line array system is optimized for the widest possible range of
touring and installation applications. With output capabilities resembling
the much larger KF760 and a footprint and weight similar to the diminutive
KF730, the KF740 is the ideal solution for a wide variety of applications
including touring sound, corporate A/V, sports arenas, houses of worship,
performing arts centers, hotel ballrooms and live clubs.

The KF740 delivers the premium, high output, 3-way performance that
is the hallmark of the KF Series in an extremely compact and easy-to-use
package. Dual 62mm voice coil HF compression drivers and dual 8-in
Concentric Summation Array (CSA) loaded MF transducers are integrated
through a common horn that occupies the entire face of the enclosure. The
astounding pattern control offered by this configuration is extended even
further (down to 160 Hz) as the MF devices are transitioned to a spaced
array of four 2.5-in voice coil 10-in woofers. The pair of LF devices integrated
within the MF/HF horn combined with the pair of side-mounted devices
provides as much as 18 dB of off-axis rejection. The EAW Focused processing
delivered via the UX8800 DSP precisely transitions from one system
subsection to another while maintaining nearly perfect 90 degree control.

A full KF740 array provides seamless coverage from directly below the array
to hundreds of feet in front. The vertical output can be tailored to match the
requirements of any space by varying the splay at the rear of the enclosures
as directed by EAW Resolution software. The resultant configuration
repeatedly produces a continuous, coherent wave front of extended­range, high resolution audio over the entire defined coverage area. Broadly
applicable line sources can be constructed solely of KF740 modules. The
versatile KF740 can also be integrated above KF730 modules or beneath
KF760 modules to extend the reach of the range to any application
imaginable. The impressive low frequency output and extension of the
KF740 can be even further enhanced by the use of the complementary
SB1002 flying subwoofer.

The truck-pack friendly KF740 is assembled in the USA with unrivaled
construction details including: cabinet grade exterior Baltic birch plywood
enclosure; wear resistant textured coating; powder-coated steel grille;
extruded structural aluminum rigging; precision quick release rigging
pins; Neutrik NL8 connectors; heavy duty bar handles; cast aluminum
side handholds; and accessory caster pallets, flybars and adapter bars (the
AB7674-73 attaches the KF740 or KF730 to the KF760, the AB7473 attaches
the KF730 to the KF740).

PERFORMANCE

Operating Range: 50 Hz to 20 kHz

Nominal Beamwidth:

Horz 90°
Vert 12°

Axial Sensitivity (whole space SPL):
LF 93 dB 50 Hz to 345 kHz

MF 107 dB 255 Hz to 1373 Hz

HF 110 dB 1220 Hz to 20 kHz

Input Impedance (ohms):
Nominal Minimum
LF 2x 8 (4) 4 @ 214 Hz

MF 8 8 @ 1372 Hz

HF 8 6.7 @ 5620 Hz

High Pass Filter: High Pass=>40 Hz, 12 dB/octave Butterworth

Accelerated Life Test:

LF 74.8 V 2x 700 W @ 8 ohm
(1400 W @ 4 ohm)

MF 70.7 V 625 W @ 8 ohm

HF 40 V 200 W @ 8 ohm

Calculated Axial Output Limit (whole space SPL):
Average Peak
LF 124 dB 130 dB

MF 135 dB 141 dB

HF 133 dB 139 dB

PHYSICAL

Dimenstions (H × W × D): 13˝ × 40.1˝ × 17.56˝

330.2mm × 1018.5mm × 446.0mm
Net Weight: 107.2 lbs (48.6 kg)
Shipping Weight 120 lbs (54.4 kg)

ORDERING DATA

Description Part Number

EAW KF740 3-way Full-Range Loudspeaker Black 0033033

Optional Accessories

KF740 flybar, FB174 0033126
KF740 pallet, PLT74K 0033466
KF740/KF730 to KF760 adapter bar, AB7674-73 2034117
KF740 to KF730 adapter bar, AB7473 0032870

Eastern Acoustic Works • One Main Street • Whitinsville, MA 01588 • tel [phone] • fax [phone] • www.eaw.com

November 2009Part Number: RD0510 (A) KF740 SPECEAW products are continually improved. All speci cations are therefore subject to change without notice.

KF740 Specifications group • S

ENCLOSURE

Material Exterior-grade Baltic birch plywood
Finish Wear resistant textured black paint
Grille Powder-coated perforated steel

NOTE: This drawing has been reduced. Do not scale.

Eastern Acoustic Works • One Main Street • Whitinsville, MA 01588 • tel [phone] • fax [phone] • www.eaw.com

November 2009Part Number: RD0510 (A) KF740 SPECEAW products are continually improved. All speci cations are therefore subject to change without notice.

KF740 Specifications group • S

10 100 1000 10000

180
135

90
45

-45

-90

-135

-180

PERFORMANCE DATA

See NOTES GRAPHIC DATA for details

Frequency Response: Multi-amplified

LF = green, MF = orange, HF = black, LF/MF/HF = blue

10

0

-10

-20

SPL (dB)

-30

-40

-50
10 100 1000 10000

Frequency (Hz)

Frequency Response: Unprocessed

LF = green, MF = orange, HF = black

120

110

100

90

SPL (dB)

80

70

60

10 100 1000 10000

Frequency (Hz) Frequency (Hz)

Impedance Magnitude

LF = green, MF = orange, HF = black

100

Phase Response: Linearity

Complete = blue

SPL (dB)

Beamwidth (-6 dB SPL Points)

Horizontal = orange Vertical = black

360

100

10

Ohms

1

10 100 1000 10000

Frequency (Hz)

Eastern Acoustic Works • One Main Street • Whitinsville, MA 01588 • tel [phone] • fax [phone] • www.eaw.com

Degrees

10

1

100 1000 10000

Frequency (Hz)

November 2009Part Number: RD0510 (A) KF740 SPECEAW products are continually improved. All speci cations are therefore subject to change without notice.

KF740 Specifications group • S

HORIZONTAL POLAR DATA

See NOTES GRAPHIC DATA for details

Eastern Acoustic Works • One Main Street • Whitinsville, MA 01588 • tel [phone] • fax [phone] • www.eaw.com

November 2009Part Number: RD0510 (A) KF740 SPECEAW products are continually improved. All speci cations are therefore subject to change without notice.

KF740 Specifications group • S

VERTICAL POLAR DATA

See NOTES GRAPHIC DATA for details

Eastern Acoustic Works • One Main Street • Whitinsville, MA 01588 • tel [phone] • fax [phone] • www.eaw.com

November 2009Part Number: RD0510 (A) KF740 SPECEAW products are continually improved. All speci cations are therefore subject to change without notice.

KF740 Specifications group • S

INPUT PANEL SIGNAL DIAGRAM

3-Way, Quad-Amp (LF, LF, MF, HF)

AMP

DSP

AMP

EQ

DELAY

HPF/LPF

AMP

AMP

LEGEND

DSP: EAW UX8800 Digital Signal Processor.
HPF: High Pass Filter for crossover or Recommended High Pass Filter.
LPF: Low Pass Filter for crossover.
LF/MF/HF: Low Frequency / Mid Frequency / High Frequency.
AMP: User-supplied Power Amplifier.

HF

MF

LF

LF

NOTES

TABULAR DATA

1. Measurement/Data Processing Systems: Primary - FChart: proprietary EAW 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 Quali cation (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
H z, 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-windowed and processed to eliminate room e ects, 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. SPL is referenced to other distances using the Inverse Square Law.

7. Enclosure Orientation: For beamwidth and polar speci cations, as shown in Mechanical Speci cation drawing.

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

9. Watts: Per audio industry practice, “loudspeaker watts” are calculated as voltage squared divided by rated nominal impedance. Thus, these are not True Watt units of energy as de ned
by International Standard.

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

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

12. Operating Mode: User selectable con gurations. Between system elements, a comma (,) = separate ampli er channels; a slash (/) = single ampli er channel. DSP = Digital Signal Processor.
IMPORTANT: To achieve the speci ed performance, the listed external signal processing must be used with EAW-provided settings.

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

14. Nominal Beamwidth: Design angle for the -6 dB SPL points, referenced to 0 dB SPL as the highest level.

15. Axial Sensitivity: Power averaged SPL over 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.

16. 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.

17. Accelerated Life Test: Maximum test input voltage applied with an EIA-426B de ned spectrum; measured with recommended signal processing and Recommended Protection Filter.

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

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

GRAPHIC DATA

1. Resolution: To remove insigni cant  ne details, 1/12 octave cepstral smoothing was applied to acoustic frequency responses and 1/3 octave cepstral smoothing was applied to the beamwidth and
impedance data. O ther 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. Beamwidth: Average angle for each 1/3 octave frequency band where, starting from the rear of the loudspeaker, the output  rst reaches -6 dB SPL referenced to 0 dB SPL as the highest level. This method
means the output may drop below -6 dB SPL within the beamwidth angle.

5. 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 Watts (see 9 above).

6. Polar Data: Horizontal and vertical polar responses for each 1/3 octave frequency band 100 Hz to 16 kHz or Operating Range.

Eastern Acoustic Works • One Main Street • Whitinsville, MA 01588 • tel [phone] • fax [phone] • www.eaw.com

November 2009Part Number: RD0510 (A) KF740 SPECEAW products are continually improved. All speci cations are therefore subject to change without notice.