X212AFD
July 2021
4
Amate Audio
It is not difficult to fulfil this first condition for the low and mid frequencies. For example,
two 7" loudspeakers that are separated by 17 cm will reproduce a cylindrical wave up
to 1015 Hz.
This condition is difficult to be fulfilled for the high frequencies, as their wavelengths are
too small to make the adjacent acoustic centres any smaller than
/2. Here comes the
second "arrayability" criterion.
•
The wave fronts generated by the individual sources are planar and the
combined surface area of the sources fills at least 80% of the total target surface
area:
H
1
·W + H
2
·W+.....+H
n
·W >=0.8·H·W
This is achieved by using waveguides, which are coupled to the compression drivers
output. We achieve flat wave fronts with a constant phase. By vertically assembling
these waveguides we fulfil the second criterion of line array construction.
Fig.2.
Second criterion of "arrayability"
