EAW Cinema MC4973 User manual

CINEMA SERIES
One Main Street, Whitinsville, MA 01588 • [phone] • FAX [phone] • Email [email protected] • Web http://www.eaw.com
EAW products are continually improved. All specifications are therefore subject to change without notice. • PUB# MC4973/11/17/98 • Printed In USA
THX is a registered trademark of Lucasfilms Ltd.
Technical Specifications MC4973
APPLICATION
• For large and very large cinemas
• Triamplified 3-way screen channel loudspeaker
• THX®-Approved
PRODUCT INFORMATION
The MC4973 full-range screen channel loudspeaker system brings 3-
way design to the largest cinema exhibition spaces. This system
provides extremely high output and must be powered by a minimum
of three amplifier channels (triamplification).
The MC4973 has been approved by the THX division of Lucasfilm,
Ltd., for use in THX-certified theaters.
Three-way design dramatically advances cinema audio quality by
improving the naturalness and intelligibility of dialog, eliminating
distortion from excessive driver excursion and extending pattern
control into the lower octaves.
The MC4973 combines many of EAW’s breakthrough technologies
including the mathematically correct mid/bass horn with phase/
displacement plug, "push/pull" low frequency technology and the
"short-throat" high frequency horn.
The three component system includes 4x 15-in woofers in a "push/
pull" configuration, 2x horn-loaded 10-in mid frequency cones and
a horn-loaded 2-in exit high frequency compression driver.
The "push/pull" configuration of the LF section reduces mechani-
callyinduceddistortionathighoutputlevels.Tomoveair"forward"
(away from the enclosure) half of the woofers push while the other
half pull.
The MC4973’s mathematically-correct MF horn with phase plug
drastically reduces the horn-throat cancellation distortion that
degrades the naturalness and intelligibility of dialog. By dividing
the mid/high material between two horn-loaded subsystems, pat-
tern control over the entire frequency range is enhanced.
The HF element - an HK294 HF system - features a 2-in exit
compression driver loaded with a short-throat 90°x 40°HF horn
ensuring even distribution of HF information throughout the audi-
torium.
Each section is provided with its own input connector. The input
panels are located on the sides of the enclosures for convenient
access in cramped installation areas.
All external components feature a “dead” flat black finish to
eliminatethereflectionoflight through perforated cinema screens.
THX is a registered trademark of Lucasfilm, Ltd.
MC4973
exp 5/18/98 mka ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED.
BOTH SIDES
INPUTS THIS
SIDE ONLY
HANDLES
SIDE
20.87
36.00
85.84 71.16
40.00
FRONT
29.75
31.44
TOP

CINEMA SERIES
One Main Street, Whitinsville, MA 01588 • [phone] • FAX [phone] • Email [email protected] • Web http://www.eaw.com
EAW products are continually improved. All specifications are therefore subject to change without notice. • PUB# MC4973/11/17/98 • Printed In USA
THX is a registered trademark of Lucasfilms Ltd.
Technical Specifications MC4973
DESCRIPTIVE DATA
Part Number 999709
LF Subsystem & Loading 4x 15-in, vented
MF Subsystem & Loading 2x 10-in, horn-loaded
HF Subsystem & Loading 1x 2-in exit compression driver
on CD horn
Number of Audio Bands 3-way
Type of Audio Bands Full Range
Powering Mode Triamplified
System Crossover Active (LF/MF - 300 Hz; MF/HF 1.8 kHz)
Recommended High-Pass
Frequency (24 dB/Octave) 30 Hz
Cabinet Type (shape) Rectangular
Enclosure Materials 15mm Baltic Birch Plywood
Finish Flat Black
Connectors 3x 2 terminal barrier strip
NOMINAL DATA
Frequency Response (1 Watt @ 1m)
±3 dB 35 Hz - 18 kHz
Axial Sensitivity (dB SPL, 1 Watt @ 1m)
LF 103
MF 109
HF 111
Impedance (Ohms) LF 2x 4
MF 4
HF 12
Power Handling, AES Standard (Watts)
LF 2000
MF 700
HF 200
Calculated Maximum Output (dB SPL @ 1m)
LF Peak 142.0
MF Peak 143.5
HF Peak 140.0
LF Long Term 136.0
MF Long Term 137.5
HF Long Term 134.0
Nominal Coverage Angle/-6 dB points (degrees)
Horizontal 90
Vertical 40
Recommended Complementary Systems
Sub SB284C
Dimensions Inches Centimeters
Height 86.00 218.5
Width 36.00 91.4
Depth 30.00 76.2
Weights Pounds Kilograms
Net Weight 505 230.0
Shipping Weight 540 245.0
COMPONENTS & CONSTRUCTION
TheMC4973isatriamplified,three-way,veryhigh-output,fullrange
three section loudspeaker system intended for use in behind-screen
cinema applications. The optimally vented LF enclosure houses 4x
15-in woofers in a "push/pull" configuration. Dual horn-loaded 10-
inmidrangedriversarehousedinaseparateMFenclosure.A2-inexit
highfrequencycompressiondriverloadedwith a 90°x 40°constant
directivity horn is mounted above the MF enclosure.
Thesystemrequirestheuseofathreebandexternalactiveelectronic
crossover. Crossover between the LF and MF sections is recom-
mended to be 350 Hz. Crossover between the MF and HF sections is
recommended to be 1.8 kHz.
Each section is provided with its own input connector. The input
panels are located on the sides of the enclosures for convenient
access in cramped installation areas.
The cabinets are constructed of 15mm void-free, 18-ply-to-the-
inch,Balticbirch plywood. Extensive internalbracingis provided to
minimize panel resonance resulting from the large acoustical
energies generated within the enclosure. The enclosure and all
external parts are coated with a flat black polyurethane finish.