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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
PRODUCT INFORMATION
The MC4972A asymmetrical full-range stage/screen loudspeaker
system brings the future of cinema audio – 3-way loudspeaker design
– to the largest premier exhibition spaces. It is intended for use as
a right- or left-channel loudspeaker in a three- or five-channel sound
system.
Its asymmetrical mid and high frequency horns let the total
loudspeaker system be placed flush to a back wall while still focusing
its output to the audience area ensuring even coverage. The
enclosures can be inverted to provide a right or left-handed angle.
This system provides extremely high output and must be powered by
a minimum of three power amplifiers (triamplification).
The MC4972A combines many of EAW’s breakthrough technologies
including the mathematically correct mid/bass horn with phase/
displacement plug, the Tuned Dipolar Array and the "short-throat"
high frequency horn.
The three enclosure system includes two low frequency systems
separated by a single mid frequency enclosure. The upper LF
enclosure also houses the high frequency system.
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 low frequency subsystems employ slot loading of each 15-in
driver pair to create Tuned Dipolar Arrays separated vertically to
provide optimal LF pattern control at 300 Hz. Optimally tuned
enclosure venting increases LF response while limiting driver excur-
sion. This method produces less distortion and minimizes driver
strain while extending LF response to the lowest octaves.
The MC4972’s dedicated midrange frequency subsystem solves many
of cinema audio’s long standing problems. Moving crossover points
out of the vocal region eliminates the acoustical anomalies which
degrade the naturalness and intelligibility of dialog. EAW’s complex,
mathematically correct MF horn with phase plug drastically reduces
the horn-throat cancellation distortion typical of two-way cinema
loudspeakers. And by dividing the mid/high material between two
horn-loaded subsystems, pattern control over the entire frequency
range is enhanced.
The HF element - an HK294A asymmetrical HF system mounted
within the upper LF enclosure - 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 auditorium.
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
MC4972A
exp 3/2/97 mka
ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE NOTED.
RIGHT SIDE
LEFT SIDE
TOP/BOTTOM
REAR
FRONT
(con't.)
