Acoustic Performance Partnership
Eastern Acoustic Works
KF400a
One Main Street, Whitinsville MA, 01588 USA • Phone 508/234-6158 • Toll Free 800/992-5013 • Fax 508/234-8251 • Web http://www.eaw.com • email [email protected]
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TECHNICAL SPECIFICATIONS
KF400a
DIMENSIONAL DRAWINGS
NOMINAL DATA
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
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 voice 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 constant directivity
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 producing a peak output of 126.0 dB SPL on axis
at 1 meter.
The internal active signal processing shall provide complex,
asymmetrical LF/MF to HF crossover. The internal amplifica-
tion module shall provide class H amplifier topology, linear
power supply and vertical N-channel MOSFET output devices
each of which is load-matched to the subsystem it powers.
Amplifier power shall provide substantial headroom such that
transient peaks are reproduced with the appropriate dynamic
range.
Driver/amplifier protection systems shall be actuated by
sensors continuously monitoring Voltage and current in real
time. Driver/amplifier protection systems shall gradually apply
compressor/limiter-based soft clipping circuitry to minimize
changes to the output sound 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 modular 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 thickness void-free cross-grain-
laminated 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 operate from 95-125 VAC and
190-250 VAC. The audio input connector shall be a female
XLR (pin 2 hot) chassis-mount connector. 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.
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
