EMP Tek ECA-44 - Manual (Page 3)

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Features
At the heart of the ECA4 and ECA44 compact theater loudspeakers are pro-
prietary aluminum cone woofers and midrange drivers. The special material
combines stiffness, low mass and self-damping properties in a manner that
allows virtually uncolored presentation of program material.
A powerful magnet, extended voice coil and bumped back plate give the bass/
midrange drivers high excursion capability. This ensures accurate dynamic
reproduction. The driver is shielded by using a steel cup and an additional
magnet to cancel any stray magnetic field that may cause interference with
video equipment such as CRT type televisions.
For high frequencies, a premium quality silk dome tweeter is used. This
tweeter uses liquid cooling to allow greater power handling and is also
magnetically shielded.
Steep acoustic slope crossovers are used to integrate drivers. The use of steep
crossover slopes allows high power handling, minimizes driver interaction
anomalies, and maximizes the clarity with which each driver is able to produce
its respective frequency band. A polyswitch, or current limiting device, is used
in the crossover to prevent damage to the tweeter if over-driven. This device
is engineered to work 900% faster than a fuse.
Constructed of cast aluminum, the cabinets also have a narrow profile to
minimize cabinet diffraction. The speakers practically disappear leaving
only a deep, wide sound stage with pinpoint imaging. High quality binding
posts ensure a good electrical contact. Sophisticated computer modeling
and measurement techniques are used extensively in the EMP loudspeaker
design process.