Acoustic Performance Partnership
Eastern Acoustic Works
CH491
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]
AC
O
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TIC
AL
PER
FORMANCE PA
RTN
ER
SH
IP
TECHNICAL SPECIFICATIONS
CH491
DIMENSIONAL DRAWINGS
DIMENSIONAL DRAWING
SERVICE ITEMS
MF: Complete Cone Driver
EAW Part No.
804021
HF: Complete Compression Driver/Tweeter
EAW Part No.
803006
Filter/Crossover Network: Complete Assembly
EAW Part No.
225060
ARCHITECTURAL SPECIFICATIONS
The passive mid/high loudspeaker systems shall incorporate
a 10-in MF transducer and 1-in exit compression driver HF
transducer.
The MF driver shall be loaded into a constant horizontal cov-
erage horn constructed of 3mm birch plywood reinforced with
high density polyurethane foam. The MF horn shall incorpo-
rate a phase/displacement plug. The HF driver shall be loaded
on a constant directivity horn with a nominal coverage pat-
tern of 90
°
(h) x 45
°
(v). An internal passive filter network
shall provide fourth order acoustical crossover and system
equalization.
System frequency response shall vary no more than
±
3 dB
from 200 Hz to 15 kHz measured on axis. The loudspeaker
shall produce a Sound Pressure Level (SPL) of 105 dB SPL on
axis at 1 meter with a power input of 1 Watt, and shall be
capable of producing a peak output of 135.8 SPL on axis at
1 meter. The loudspeaker shall handle 300 Watts of amplifier
power (AES Standard) and shall have a nominal impedance
of 8 Ohms.
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 catalyzed poly-
urethane. Input connectors shall be 4-terminal barrier strip
and 1x Neutrik NL4 Speakon. A total of twenty 3/8"-16
threaded mounting/suspension points (5 each on top and
bottom, 4 per side, 2 on rear) shall be provided. The front of
the loudspeaker shall be covered with a vinyl coated perfo-
rated steel grill.
The mid/high loudspeaker shall be the EAW model CH491.
10.50
2.00
2.00
6.00
3.50
12.75
13.83
3.57
BACK
18.50
3.83 TYP
9.00
2.68 TYP
22.50
19.75
2.50
10.45
12.75
18.41
24.63
2.68 TYP
2.50
1.88 TYP
20.62
13.83 TYP
TOP
A
A
33
°
13.24 REF
VIEW A-A
5.75
12.00
SIDE
FRONT
BOTTOM
MOUNTING POINT, 3/8"-16 THREADED HOLE.
DIMENSIONS LABELED "NOM" ARE +0 / -1/16"
4.56 REF
CH491
ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED.
510219
exp 2/16/97 shb
CENTER OF GRAVITY.
