Type Power source Fundamental frequency, Hz IMO minimum required 1/3 rd octave band level at 1m, db IMO required
fundamental
frequency, Hz
AT 150/330 Air-driven 330 130 250-700
MKT 75/260 Air-driven 260 130 250-700
MKT 75/350 Air-driven 350 130 250-700
MKT 75/440 Air-driven 440 130 250-700
ETD 100/350 Electronic 350 130 250-700
LP 75 Electrically driven 350 130 250-700

 

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