One Main Street, Whitinsville, MA 01588 • (508) 234-6158 • FAX (508) 234-8251 • Email [email protected] • Web http://www.eaw.com
EAW products are continually improved. All specifications are therefore subject to change without notice. • PUB# MC4972A/2/22/97 • Printed In USA
CINEMA SERIES
Technical Specifications MC4972A
PRELIMINARY INFORMATION
DESCRIPTIVE DATA
Part Number
999499
LF Subsystem & Loading
4 x 15" vented
MF Subsystem & Loading
2 x 10" horn loaded
HF Subsystem & Loading
1 x 2" exit compression driver
on CD horn
Number of Audio Bands
3-way
Type of Audio Bands
Full Range
Powering Mode
tri-amp
System Crossover
active
Controls (switches, knobs)
none
Recommended High-Pass
Frequency (24 dB/Octave)
30 Hz
Cabinet Type (shape)
rectangular
Enclosure Materials
15mm Baltic Birch Plywood
Finish
Flat Black
Connectors
4 x 2 terminal barrier strip
NOMINAL DATA
Frequency Response (Hz)
±
3 db
35 Hz - 18 kHz
Efficiency / Axial Sensitivity (dB SPL/1 Watt/1m)
LF
101
MF
109
HF
112
Impedance (Ohm)
LF
2 x 4 Ohms
MF
4
HF
12
Power Handling (Watts)
LF AES Standard
3200
MF AES Standard
600
HF AES Standard
200
Calculated Maximum Output (dB SPL)
LF Peak
142.1
MF Peak
142.8
HF Peak
141.0
LF Long Term
136.1
MF Long Term
136.8
HF Long Term
135.0
Nominal Coverage Angle / -6 dB points (degrees)
Horizontal
90 (assymetrical )
Vertical
40
Recommended Complementary Systems
Sub
SB184C, SB185C, SB284C
Dimensions
Height
80.13 in 2035 mm
Width
36 in
914 mm
Depth
30.5 in
775 mm
Weights
Net Weight
525 lb
238.9 kg
Shipping Weight
570 lb
259.4 kg
located on the input panel of the enclosing LF system. 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
eliminate the reflection of light through perforated cinema screens.
COMPONENTS & CONSTRUCTION
The MC4972A is a triamplified, three-way, very high-output, full
range loudspeaker system composed of three asymmetrical enclo-
sures. It is intended for use in behind-screen cinema applications.
Two optimally vented LF enclosures (separated by the MF horn) each
house dual slot-loaded 15-in woofers. Dual horn-loaded 10-in
midrange drivers are housed in a separate MF enclosure. A 2-in exit
compression driver loaded with a 90
°
x 40
°
constant directivity horn
is mounted to the upper LF enclosure.
The system requires the use of a three band external active electronic
crossover. Crossover between the LF and MF subsystems is recom-
mended to be 350 Hz. Crossover between the MF and HF subsystems
is recommended to be 1.8 kHz.
The high power input signals require the use of two-terminal barrier
strip input connectors to create gas-tight connections, minimizing
corrosion and maximizing signal transfer. The barrier strips
accomodate bare wire, tinned leads or spade lugs. Each enclosure is
provided with its own input connector. Input for the HF section is
located on the input panel of the enclosing LF system. The input
panels are located on the sides of the enclosures for convenient
access in cramped installation areas.
The cabinet is constructed of 15mm void-free, 18-ply-to-the-inch,
Baltic birch plywood. Extensive internal bracing is 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.
The system includes four mounting points on each side of each
enclosure for use with vertical stabilizing bars. The LF enclosures
also include two additional mounting points on each side to accept
optional acoustical baffles.
