LA Audio BCL20 - Manual (Page 12)

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As an alternative, one can emulate such a filter, using a stereo
one-octave equalizer set in such a way that the frequency
response approximates that of figure 2.
Fig. 2
THE BCL20 AS AN ACOUSTIC NUISANCE THE BCL20 AS AN ACOUSTIC NUISANCE LIMITER : LIMITER :
This is a complementary aspect of loudness limiting, but in this
instance, the sound pressure level which must be limited is one
that remains after attenuation and conduction outside the room
or building where the sound is produced.
Very often, only certain low frequencies are transmitted, in
particular those which excite resonant modes of cavities, walls
or structures.
To achieve efficient limiting of those frequencies, it is necessary
to measure the noise transmission, using a real-time spectrum
analyser (preferrably 1/3ÿoctave).
When this is done, one has to copy the frequency response to a
graphic equalizer which is inserted in the side-chain.
In operation, limiting will occure predominantly at those
frequencies which create a nuisance.
NB : To improve this scheme, it may be necessary to use a
parametric equalizer, tuned precisely at the frequencies which
excite resonances.