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MANCHESTER Series
DISTANCE EQ COMPENSATION OVERLAY
All speakers are affected by air loss over distance, this set of Two elements per amplifier DSP module block
overlays is in increments of 3 m and ensures a balanced high
frequency response over distance. Peaking or Bell filters are
used to keep headroom in the high frequency band rather
than high shelf filters which unnecessarily use up headroom
for frequency which will not travel over far distances.
Rules of AirEQ:
DO NOT INSERT MORE THAN 1 FILTER AT THE SAME TIME.
FOR INTERMEDIATE DISTANCES, USE THE CLOSEST
OVERLAY AVAILABLE
AirEQ overlays are available at:
9 m, 12 m, 15 m, 18 m, 21 m, 24 m, 27 m, 50 m, and + 50 m
Here we have some examples of how the useful frequency
and gain changes over distance:
AirEQ9 m – For elements within an array aimed at 9
m distance
AirEQ24 m – For elements within an array aimed at 24
m distance
AirEQ50 m – For elements within an array aimed at
50m distance
AirEQ 21 m
AirEQ 18 m
AirEQ 15 m
AirEQ 12 m
EQ STRATEGY: Considerations for consistant frequency response in the sound field
Flat arrays (minimium inter-element angle between Flat Array
elements) will have an increase in the mid frequency band
typically between 630 Hz -2 kHz
Curved array (inter-element angle used between elements)
Curved Array
will have decrease in the mid frequency band typically
between 630 Hz -2 kHz
It is recommended that you split the EQ strategy to suit
the mechanical curvature of the array to gain consistant
frequency response.
Example: Here we have a typical J curved array of 8 MV212
elements – as we have 2 MV212 elements per Lake DSP
module, it gives 4 discrete ZONEs that can have small
adjustments in the mid band area that is affected by the
mechanical aiming of the array causing coupling and de-
coupling.
Using one of the many industry-standard measurement
software systems, reference microphones and sound-cards,
find the mid range frequency affected, and adjust each zone
for consistant frequency response between zones/sound
field area.
Lake software offers integration to many of these software
systems, further information can be found at www.
labgruppen.com
Quick Start Guide
Flat Array Frequency Response
Boost in Mid Energy
due to physical coupling
Low Frequencies Mid Frequencies High Frequencies
Curved Array Frequency Response
Cut in Mid Energy
due to physical de-coupling
Low Frequencies Mid Frequencies High Frequencies
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