Series R y ST. Manual de Usuario /
R and ST Series. User's Manual
57
4.4 Arraying
Ideally, only a super-high powered variable coverage speaker
would be used per channel for covering any room. This
not achievable in real life, so one must resort to arrays
or clusters.
Speakers are arrayed for two reasons:
- To extend the coverage of a system that has too
narrow directivity.
- To increase the sound pressure level.
The tables that follow offer directivity information for
different tight-packed array combinations, separately
for horizontal and vertical. - 6 dB coverage angle,
directivity index (an expression of the directivity of an array,
the more directive the higher) and on-axis SPL (relative to a
single box) results are provided.
For every model, results are provided for a number of array
boxes from 1 to 5, with splay angles from 0 to 50 degrees in
10-degree intervals. Results are for the 500 to 8kHz band,
except for subs, where a one octave 100 Hz band is used.
NA
The results are calculated from polars with two degree angular and 1/24th octave
frequency resolution. Coverage angles from a single box may differ from those in the
specifications section. Active mode was used in active/passive boxes. AUTOPOL, a
platform consisting of custom and customised hardware and software, was used for
automated high-resolution array predictions. Predictions for the 500-8k Hz band may
overestimate the coverage angle which can reach lower values at specific frequencies.
Example.
A 3x2 ST-112 array (3 columns and 2 rows) with 40-
degree horizontal and 30 degree vertical splay (shown on the
illustration).
To find out the coverage of such array, we go to the horizontal
section of the ST-112 table and look for the 40º/3x cells, and
the 30º/x2 cells on the vertical section. The results (cells have
a grey background) show coverage angles of 165 degrees
horizontal and 85 degrees vertical, and an on-axis SPL of +0
dB (horizontal) and +3 dB (vertical) for a total on-axis level of
+3 dB (0 dB hori 3 dB vertical) above the level for a
single box.
R-112
Horizontal
Nr. of elements /
Splay angle
1x 2x 3x 4x 5x
variable
Angle Di SPL Angle Di SPL Angle Di SPL
Angle Di SPL
Angle Di SPL
0º
100º 9dB 0dB 90º 13dB
+5dB
65º 16dB
+8dB
30º 18dB
+10dB
15º 20dB
+11dB
10º
95º 13dB +5dB 100º 13dB +6dB 100º 13dB +8dB 120º 11dB +7dB
20º
105º 13dB +5dB 125º 11dB +5dB 145º 9dB +5dB 160º 8dB +5dB
30º
115º 12dB +4dB 160º 8dB +3dB 175º 8dB +5dB 220º 5dB +3dB
40º
130º 11dB +4dB 190º 6dB +2dB 210º 6dB +4dB 275º 3dB +2dB
50º
145º 10dB +3dB 220º 4dB +1dB 255º 6dB +3dB 315º 2dB +2dB
Vertical
Nr. of elements /
Splay angle
x1 x2 x3 x4 x5
variable
Angle Di SPL Angle Di SPL Angle Di SPL
Angle Di SPL
Angle Di SPL
0º
75º 10dB
0dB 70º 15dB
+5dB
30º 17dB
+8dB
25º 19dB
+10dB
15º 21dB
+11dB
10º
80º 14dB +5dB 90º 13dB +6dB 90º 13dB +7dB 110º 11dB +6dB
20º
90º 13dB +4dB 120º 11dB +4dB 135º 9dB +4dB 165º 7dB +4dB
30º
105º 12dB +4dB 150º 8dB +3dB 170º 7dB +3dB 205º 5dB +3dB
40º
125º 11dB +3dB 185º 6dB +2dB 205º 6dB +3dB 270º 3dB +2dB
50º
145º 9dB +2dB 210º 5dB +1dB 245º 5dB +2dB 300º 3dB +2dB
R-115
Horizontal
Nr. of elements /
Splay angle
1x 2x 3x 4x 5x
variable
Angle Di SPL Angle Di SPL Angle Di SPL
Angle Di SPL
Angle Di SPL
0º
95º 9dB 0dB 90º 14dB
+5dB
55º 16dB
+8dB
20º 18dB
+10dB
15º 20dB
+11dB
10º
95º 13dB +5dB 100º 13dB +6dB 105º 12dB +7dB 120º 11dB +6dB
20º
100º 13dB +5dB 130º 10dB +4dB 145º 9dB +5dB 165º 8dB +5dB
30º
110º 12dB +4dB 160º 8dB +3dB 170º 8dB +4dB 215º 5dB +3dB
40º
125º 11dB +3dB 185º 6dB +2dB 205º 7dB +4dB 260º 3dB +2dB
50º
145º 10dB +3dB 215º 4dB +1dB 250º 5dB +3dB 315º 2dB +1dB
Vertical
Nr. of elements /
Splay angle
x1 x2 x3 x4 x5
variable
Angle Di SPL Angle Di SPL Angle Di SPL
Angle Di SPL
Angle Di SPL
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