Air horn (for ships > 200 m)
MKT 150/110 - 143 DB
Kockum Sonics
Hence, one part of the responsibility is the manufacturer's, but still one important part is the shipowner's regarding the choice of appropriate equipment for the vessel in question, the installation and use.
The reason behind the stipulated use of 1/3 octave band filters when measuring is connected to the theory of the hearing sense.
A "complex" sound like that from TYFON® or SUPERTYFON
consists of several harmonic com-ponents.
Consequently, the total SPL value is considerably higher than the measured (stipulated) 1/3 octave value.
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