7.7.3 - PICTORIAL ASPECTS OF THE LOUDSPEAKER
ENCLOSURES
From a simple acustical transducer in the early 1920, the
modern loudspeaker enclosure system is a precise piece of
electro acustical engineering as well as a superb cabinet
making. The pictorial sequence illustrates its most representative
models
The high efficiency accoustical
enclosure type Hartsfield made by JBL in the USA in
the mid fifities. It was originally developed for sound
reinforcement comprising a 15 inch woofer and a high
frequency horn.
In 1954 the american engineer
Edgar M. Villchur developed a new type of loudspeaker
enclosure system operating by the acustic suspension
principle. Originally the first model AR-1 used only
a 12 inch woofer. A separated electrostatic transducer
was used for the reproduction of the high frequency
range.
The assembled experimental
acustic suspension developed by E. Villchur in 1954.
The loudspeaker
enclosure made in several versions. Commoly known as the
voice of theatre was made by Altec in the USA. It used
a 15 inch woofer and a sectorial horn respectively for
reproducing the low and high frequency ranges.