EAW MC4973B 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# MC4973B/11/16/98 • Printed In USA
Technical Specifications MC4973B
APPLICATION
• For large and very large cinemas
• Biamplified 3-way screen channel loudspeaker
PRODUCT INFORMATION
The MC4973B full-range screen channel loudspeaker system brings
3-way design to the largest cinema exhibition spaces. Its passive
mid/high biamplified design lets it replace existing biamped two-
way systems without requiring new electronic crossovers or ampli-
fiers. (Electronic crossovers settings may need to be adjusted.)
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 MC4973B 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 MC4973B’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 MC4973B requires the use of an external active electronic
crossover between the LF section and mid/high section which
includes an internal passive crossover/filter network. EAW's com-
plex, computer-designed passive filter networks are tightly aligned
to the loudspeakers they control and go beyond merely dividing the
signal, performing critical equalization functions.
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.
InputconnectorsfortheLFandMFsections are two-terminalbarrier
strips. A "jumper cable" is included to continue the signal chain to
the HF section. Bind posts for the HF section are located directly on
the compression driver. 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.
MC4973B
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# MC4973B/11/16/98 • Printed In USA
Technical Specifications MC4973B
DESCRIPTIVE DATA
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 Biamplified
System Crossover Active LF/MF - 300 Hz; Passive MF/HF
Recommended High-Pass
Frequency (24 dB/Octave) 30 Hz
Cabinet Type (shape) Rectangular
Enclosure Materials 15mm Baltic Birch Plywood
Finish Flat Black
Connectors 2x 2-Terminal Barrier Strips (LF and MF)
plus Bind Posts (HF, jumper cable
included)
NOMINAL DATA
Frequency Response (1 Watt @ 1m)
±3 dB SMPTE/ISO 2969 "X" curve
35 Hz - 18 kHz
Axial Sensitivity (dB SPL, 1 Watt @ 1m)
LF 103
MF/HF 108
Impedance (Ohms) LF 2x 4
MF/HF 4
Power Handling, AES Standard (Watts)
LF 2000
MF/HF 600
Calculated Maximum Output (dB SPL @ 1m)
LF Peak 142.0
MF/HF Peak 141.8
LF Long Term 136.0
MF/HF Long Term 135.8
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
The MC4973B is a biamplified, three-way, very high-output, full
range 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-
loaded10-inmidrangedriversarehousedinaseparateMFenclosure.
A 2-in exit high frequency compression driver loaded with a 90°x
40°constant directivity horn is mounted above the MF enclosure.
The system requires the use of an external active electronic
crossover between the LF and mid/high sections. The mid/high
component includes a internal passive crossover/filter network.
EAW's complex, computer-designed passive filter networks are
tightly aligned to the loudspeakers they control and go beyond
merely dividing the signal, performing critical equalization func-
tions.
Inputconnectors for theLFandMFsections are two-terminalbarrier
strips. A "jumper cable" is included to continue the signal chain to
the HF section. Bind posts for the HF section are located directly on
the compression driver. 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.