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TECHNICAL SPECIFICATIONS KF400a
DESCRIPTION
The KF400a Powered Virtual Array™ Loudspeaker System
optimizes performance and reliability for a wide range of
portable and permanently-installed sound reinforcement
applications. The internal Close Coupled Power Module
provides ample distortion-free amplification as well as
sophisticated, tran sparent driver/amplifier pr otection circuitry
and signal processing.
EAW’s VA™ loudspeaker system design philosophy sets the
world standard for arrayabilty and performance by applying
advanced horn-loading con cepts to the three-way loudspeaker
configuration. Th e cone-loaded mid range h orn’s flare follows
a complex mathem atical fun cti on (n ot str ai ght lin es) allowing for smooth expansion of the wavefront. The newly
designed phase plug – the first example of EAW’s next
generation of phase plug designs – ensures coherent summation of th e wavefron t in the h orn throat, enhan cin g both
the smooth sound character and arrayability of the system.
CLOSE COUPLED POWER
™
The Close Coupled Power concept integrates amplification
with the loudspeaker system to maximize performance,
reliability and efficiency. Precisely matching the amplifier
design to the specific system’s driver/horn/enclosure
characteristics provides a substantial amount of headroom
without compromising r eliability . State-of-the-art protecti on
systems - actuated by real-time current and voltage
monitors – apply complex compressor/limiters and soft
clipping circuitry for virtu ally transparen t protection o f both
the amplifier and the drivers, even when driven to the
highest output levels. M odular input design allows f or future
system upgrades.
Authorized service professionals can access many elements
of the Close Coupled Power Module simply by removing the
back panel. When necessary the CCPM can be removed as a
self-contained unit.
APPLICATIONS
The KF400a provides the greatest user-benefit to sound
reinforcement applications utilizing the distributed loudspeaker system approach. Distributed amplifier/processor
racks and their associ ated logistical/compatibility pr oblems
are eliminated from the design. Determine the appropriate
loudspeaker system placemen t to meet your application’s SPL
and coverage r equir ements, d eliver audio and A C feeds , and
enjoy the results. The loop-through audio chain allows for
the immediate creation of arrays from a single audio feed.
The KF400a features a six year warranty on loudspeaker
enclosure and compon ents , four years on active electr oni cs.
Applications include:
Corporate Events Convention Centers
Ballroom Events Band PA
Small Worship Spaces Live Music Club
DESCRIPTIVE DATA
Configuration 3-way, Full Range
Powering Internal/Biamplified (passive LF/
MF crossover)
LF Subsystem 1x 15-in, Vented
MF Subsystem 1x 8-in Cone, Horn-Loaded
HF Subsystem 1x 1.4-in exit/75mm voice coil
Compression Driver on Constant
Directivity Horn
Coverage Angles 65° (h) x 45° (v)
Cabinet Type (shape) Trapezoidal
Enclosure Materials Baltic Birch Plywood
Finish Black Polyurethane
Connectors 1x Neutrik PowerCon (AC mains);
XLR female (audio input); XLR male
(audio output) Pin 2 Hot
Suspension Hardware (5) 3-Position Flytracks with
Integral 3/8"-16 Threaded
Mounting/Suspension Points
(2 top and 3 bottom)
Grill Vinyl Coated Perforated Steel
Options Flyclip w/Ring (179001)
Flyclip w/Hook (179002)
Dimensions inches millimeters
Height 36.50 927
Width (Front) 19.75 502
Width (Rear) 12.79 325
Depth 19.75 502
Trapezoid Angle 10° per side
Weights pounds kilograms
Net Weight 160 72.7
Shipping Weight 168 76.4
EASTERN ACOUSTIC WORKS
Acoustic Performance Partnership Eastern Acoustic Works KF400a
One Main Street, Whitinsville MA, 0158 8 USA • Phone 508/234-6158 • Toll Free 800/992-5013 • Fax 508/234-8251 • Web http://www.eaw.com • email info@eaw.com
One Main Street, Whitinsville, MA 01588 • (508) 234 - 6158 • FAX (508) 234 - 8251 • Email info@eaw.com • Web http://www.eaw.com
EAW products are continually improved. All specifications are therefore subject to change without notice. • PUB# KF400a-888045 (A)/4 pp/1/29/99 • Printed In USA
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CLOSE COUPLED POWER™ MODULE
TECHNICAL SPECIFICATIONS KF400a
Fault LED
Indicates that protection
circuitry has shut down the
unit to avoid damage to
drivers or electronic d evices.
Power ON LED
Indicates that the unit is
powered and ready for
operation.
HF/LF Output Current LEDs
Indicates output curren t f or
both the high and low
amplifier channels.
HF/LF Limit LEDs
Indicates that protection
circuitry is actively limiting
output to protect the
drivers or electronic
components.
CIRCUIT BREAKERS
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MAINS SUPPLY
Operating voltage range:
WARNINGS:
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK DO NOT EXPOSE THIS EQUIPMENT
TO RAIN OR MOISTURE.
THIS SURFACE MAY BECOME HOT WHILE
THE UNIT IS OPERATING. ALLOW AT LEAST 6
INCHES CLEARANCE FROM THIS SURFACE
AND ADEQUATE VENTILATION TO ENSURE
RELIABLE OPERATION.
CAUTION: TO PREVENT ELECTRIC SHOCK
DO NOT REMOVE COVERS. NO USER
SERVICEABLE PARTS INSIDE. RREFER TO
QUALIFIED SERVICE PERSONNEL.
DISCONNECT AC POWER BEFORE
ATTEMPTING SERVICE OR CONFIGURATION.
Power ON
HF Output Current
LF Output Current
Fault
HF Limit
LF Limit
Turn on 85VAC, turn off 260VAC
UNLOCK LOCK
AC INLET
PUSH
CLOSE COUPLED
POWER MODULE
Whitinsville, MA U.S.A.
PUSH
TO
RESET
95-250VAC
50-60Hz
8A RMS
16A Peak
PIN 2=POS (+),
PIN 3=NEG (-)
PIN 1=GND ( )
Circuit Breakers
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The AC Circuit Breakers
protect the unit from power
line faults and electronics
failure.
AC Input
Neutrik PowerCon lockin g AC
connector provid es AC power
connection. Auto-sensing
power input operates from
95-125 VAC and 190-250
VAC.
Audio Signal Input
A balanced, 3-pin, female
XLR connector is provid ed for
LOOPINPUT
the audio signal input
connection.
Audio Signal Loop Output
A balanced, 3-pin, male XLR
connector provides a
hardwired loop out of the
input signal.
Rear Exhaust Grills
The fan exhaust grills ar e the
main exits for air dr awn into
the unit for cooling. Avoid
blocking air flow.
Acoustic Performance Partnership Eastern Acoustic Works KF400a
One Main Street, Whitinsville MA, 0158 8 USA • Phone 508/234-6158 • Toll Free 800/992-5013 • Fax 508/234-8251 • Web http://www.eaw.com • email info@eaw.com
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
MADE IN USA
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DIMENSIONAL DRAWING
V
i
INDICATES MOUNTING POINT, 1/4-20 THREADED HOLE.
KF400a
PARTIALY SHOWN GRILL
19.75
19.00
36.50
INDICATES CENTER OF BALANCE.
ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED
1.97
32.56
2X HANDLES
10.99
TECHNICAL SPECIFICATIONS KF400a
9.77
8.75
LID
19.51
16.12
9.50
.89
C
L
7.88
7.74
510614
exp 2/2/99 dpm
FRONT
9.93
15.44
BOTTOM ONLY
SIDES
20°
12.51
C
L
7.74
12.79
TOP/BOTTOM
CCPM™ INPUT SECTION BLOCK DIAGRAM
XLR / Input PCB
RFI Attenuation /
Transient Protection
XLR-M
Signal
3
2
1
Input
XLR-M
Signal
3
2
1
Loop
Power On Fault
HF Output HF Limit
LF Output LF Limit
4th Order
High-Pass Filter
Analog Control Module
4th Order
Low-Pass Filter
High CMRR
Input Receiver
Voltage
Controlled
HF Parametric
Amplifer
HF Control Voltage
ACM PCB
Voltage
Controlled
LF Parametric
Amplifer
Low Control Voltage
+
Filter #1
Filter #1
HF Parametric
Filter #1
High Gain Set
LF Parametric
Filter #2
Low Gain Set
Low Mute
Alignment
High Mute
6.44
4.12
4.68
6.12
HF Driver
(delay)
∆t
LF Parametric
Filter #3
∑
Low Gain
Control
INPUT
BACK
A
19.75
A
CASTER PALLET MOUNT,
BOTTOM ONLY
2nd Order
Low Pass Filter
∑
High SOA
Control
Compress
HighClamp
Compress
LF Parametric
Filter #4
Low Sliding
Filter Control
CV
Low SOA
Compress
Low ClampCompress
High Gain
7.50
High SIG
High Driver
Multiplexer
+
LF Sliding
High -Pass Filter
Low Driver
Multiplexer
+
-
High O/P V
High O/P I
High SOA
High CLAMP CV
High SIG
Low S
Low O/P V
Low O/P I
Low SOA
Low CLAMP C
Low SIG
Acoustic Performance Partnership Eastern Acoustic Works KF400a
One Main Street, Whitinsville MA, 0158 8 USA • Phone 508/234-6158 • Toll Free 800/992-5013 • Fax 508/234-8251 • Web http://www.eaw.com • email info@eaw.com
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TECHNICAL SPECIFICATIONS KF400a
NOMINAL DATA
DIMENSIONAL DRAWINGS
Frequency Response (1 Watt @ 1m)
±3 dB 62Hz to 20kHz
-10 dB 45 Hz
Calculated Maximum Output (dB SPL @ 1m)
Full Range Peak 126.0
Full Range Long Term 122.0
Nominal Coverage Angle/-6 dB points (degrees)
Horizontal 65
Vertical 45
Close Coupled Power™ Module
Topology Class H, linear power supply,
vertical N-channel MOSFET output
devices
AC mains voltage Auto-sensing, 95 – 250 VAC, 47/66
Hz
AC power
requirement (max) 1800 W peak, 950 W continuous
AC wiring Ground, plus two hot lines or hot
plus neutral
Input Sensitivity 0.775 V
Input Impedance (Ohms) 600
Protection Short Circuit, Latch-up, device Safe
Operating Area, overtemperature,
Soft Clip, soft turn-on, turn-off,
fault mute, driver thermal
protection, driver excursion
limiting. The KF400a must be
disconnected from the AC mains in
order for the Fault trip to reset.
CMRR 90 dB (typical)
LED Indicators Power On, LF Current, HF Current,
LF Limit, HF Limit, Fault
Maximum Ambient
Temperature For
Full Output 50° C
Altitude 6500 ft
Humidity 10% to 95%, non-condensing
SERVICE ITEMS
LF: Complete Cone Driver
EAW Part No. 804083
MF: Complete Cone Driver
EAW Part No. 804086
HF: Complete Compression Driver/Tweeter
EAW Part No. 803040
HF: Diaphragm Assembly
EAW Part No. 804023
Close Coupled Power™ Module: Complete Assembly
EAW Part No. 230002
ARCHITECTURAL SPECIFICATIONS
The self-powered, biamplified 3-way full range loudspeaker
systems shall incorporate a 15-in LF transducer, an 8-in MF
cone and a 1.4-in exit/75mm voi ce coil HF compression driver .
The LF driver shall be mounted in a vented enclosure tuned
for optimum low frequency response. The MF driver shall be
loaded into a midrange horn constructed of 3mm birch
plywood backed with high density polyurethane foam that
shall incorporate a conical/hexagonal displacement/phase
plug. The HF driver shall be loaded on a con stant dir ectivity
horn with a nominal coverage pattern of 65° (h) x 45° (v).
An internal passive filter network shall provide fourth order
acoustical crossover and system equalization between the
LF and MF subsystems.
System frequency response shall vary no more than ±3 dB
from 62 Hz to 20 kHz measured on axis . The system shall be
capable of produ cing a peak output o f 126.0 dB SPL on axis
at 1 meter.
The internal active si gnal processing shall provide complex,
asymmetrical LF/MF to HF crossover. The internal amplification module shall provide class H amplifier topology, linear
power supply and vertical N-channel M OSFET output devi ces
each of which is load-matched to the subsystem it powers.
Amplifier power shall provid e substantial head room such that
transien t peaks are reprod uced with the appropri ate dynamic
range.
Driver/amplifier protection systems shall be actuated by
sensors continu ously monitorin g Voltage and current in real
time. Driver/amplifi er protection systems shall grad ually apply
compressor/limiter-based soft clipping cir cuitry to minimize
changes to the output soun d characteristics when engaged.
The amplifier module shall be designed so that most
components shall be accessed by removing the rear panel.
The input circuitry shall be of a m odular design to allow for
future upgrades. The entire amplifier module shall be easily
removable as a discreet unit.
The loudspeaker enclosure shall be trapezoidal in shape. It
shall be constructed of 15mm thi ckness void-free cr oss-grainlaminated Baltic birch plywood and shall employ extensive
internal bracing. It shall be finished in black polyurethane.
The AC power input connector shall be Neutrik PowerCon.
Auto-sensing power input shall oper ate from 95-125 V AC and
190-250 VAC. The audio input connector shall be a female
XLR (pin 2 hot) chassis-mount conn ector. A complementary
male XLR chassis-mount connector (pin 2 hot) shall be
provided for audio output (loop through). Five (5)
3-position flytracks (2 top and 3 bottom) shall be installed
in the enclosure. The front of the loudspeaker shall be
covered with a powder-coated perforated steel grill.
The self-powered, biamplified 3-way full range loudspeaker
shall be the EAW model KF400a.
Acoustic Performance Partnership Eastern Acoustic Works KF400a
One Main Street, Whitinsville MA, 0158 8 USA • Phone 508/234-6158 • Toll Free 800/992-5013 • Fax 508/234-8251 • Web http://www.eaw.com • email info@eaw.com
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