I would disagree with JoGary on this. The frequencies are actually diversified and can be very useful for threat classification.
DW v1.01 database (without LW/Ami mod) lists the following frequencies of active sonars:
Los Angeles - 2500 Hz
Seawolf - 2800 Hz
Akula - 4000 Hz
Kilo - 5000 Hz
FFG - 7500 Hz
Other surface - 3500 Hz
MH 60 Dip - 14000 Hz
DICASS - 10000 Hz
Weapons - all torpedoes and UUVs - 22000 Hz
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