Meyer Sound Mina Compact - Manual (Page 23)

MINA OPERATING INSTRUCTIONS
23
High-Frequency Equalization Strategies
For far-field coverage, air absorption plays a critical role. The
longer the distance, the greater the attenuation that occurs
for high frequencies. In this zone, high frequencies generally
require correction to compensate for energy lost over dis-
tance; the correction is usually proportional to the distance
and high-frequency air absorption.
For near- to mid-field coverage, air absorption is not nearly
as critical; in this zone, high frequencies need little or no cor-
rection.
Low-Frequency Equalization Strategies
Although arrays can be zoned for different equalization
curves for high frequencies, similar or identical equalization
should be maintained for all low-frequency filters for the
array. Different low-frequency equalization settings within
the same array will degrade the desired coupling effect.
For the same reason, severe gain tapering is not recom-
mended for arrays, since adjusting various zones with an
overall amplitude control for each results in the following:
■ The length of the array is effectively shortened
■ Directivity decreases at low frequencies
■ Low-frequency headroom decreases
Figure 2 shows a series of MAPP Online Pro plots for a
MINA array. Note that small vertical splay angles in the
upper part of the array cover longer distances, while greater
angles in the lower elements increase vertical coverage for
shorter distances.
NOTE: For more information on optimizing and
equalizing MINA arrays, refer to the MINA Sys-
tem Startup Guide (PN 05.207.100.01) available at
www.meyersound.com .
Figure 2: Mapp Online Pro Plots Showing Directivity
2 °
3 °
4 °
5 °
7 °
9 °
11 °
4 °
3 °
STOW
B A
GROUND STACK GROUND STACK Berkeley, CA MG-MINA SEE MG-MINA ASSEMBLY GUIDE FOR ADDITIONAL LOAD
RATINGS AND RIGGING SAFETY INFORMATION. CAUTION: DO NOT EXCEED LOAD RATING
PRECAUTION: NO EXCEDER LIMITE DE CARGA
ATTENTION: N'EXCEDEZ PAS L'ESTIMATION DE CHARGE
VORSICHT: UBERSTEIGEN SIE NICHT LAST BEWERTUNG 5:1 7:1 693 lbs
314.3 kg
(16 MINA) 495 lbs
224.5 kg
(12 MINA) LOAD RATINGS: FLOWN A 0º B -5º A -10º MINA FLOWN
POSITIONS RESULT
ANGLE
125 Hz
250 Hz
500 Hz
1 kHz
2 kHz
4 kHz
8 kHz