Ecler EPC7000 Manual De Instrucciones página 6

The bass-reflex system inverts the phase of sound radiated from the rear of the speaker
in order to widen the low-range playback boundary. The accurate calculation of the bass-reflex
port dimensions is a key factor when evaluating the success of an acoustic enclosure design.
ECLERs Research Department has created SIMBOX, software based on W. Marshall Leach's
publications. It converts the different physical loudspeaker and enclosure parameters into
discreet R-L-C elements and controlled sources. The software then communicates via macros
with an electronic simulation package, which performs all calculations and facilitates graphical
representation.
Both 18'' (45,7 cm) drivers mounted on the EPC218D feature a huge permanent
ceramic magnet and 114 mm voice coils. They are able to withstand excursions up to 20 mm
and 1600 Wrms input power.
DIRECT RADIATION WITH TWIN SYSTEMS
Very high radiation levels can be achieved with this method, which consists of mounting
two identical drivers into the same enclosure. The drivers need to be perfectly matched in their
characteristics, as otherwise unwanted mutual loading may develop. This technique represents
a 3dB radiation increment in comparison to single driver configurations.
Both 15'' (38,1 cm) speakers feature 100 mm voice coils and withstand maximum
excursion up to 4mm. For the high-frequency way, a neodymium motor has been used along
with a 2'' ferrofluid voice coil and a titanium diaphragm coupled to a plastic-moulded
antiresonant constant-directivity "phase plug" diffusor. These pieces are placed between the
diaphragm and the horn throat, avoiding cancellation of certain critical frequencies.
ACOUSTIC ENCLOSURES
Wood and construction
If the employed components represent 51% of the success of an acoustic system, the
remaining 49% belongs to the acoustic enclosure and its construction. The plywood panels
used on the EPC is very stiff and light. The boxes feature braces which minimize coloration
caused by surface vibration. Constructed with 15 mm plywood, the midrange and high-
frequency cabinets include a wooden ring inside the box which snugly fits around the tweeter
motor thus reinforcing its subjection and protecting the diffusor from possible impacts or
vibrations. Its trapezoidal shape has a 6° angle on each side. The low frequency cabinet is built
from 18 mm birch plywood. Both enclosures feature inset handles to make transporting and
handling easier.
Absorbers
Inside the box, stationary waves can originate and affect the sound purity. One way to
minimize this effect is to use absorbers. EPC cabinets use antiallergic, oncologically inoffensive
synthetic fibre glued onto the inner box walls.
Painting
A new resin-based chemical component provides a high durability treating, being scratch
and bump resistant.
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