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Originally Posted by Henson
Sometimes it's better to wonder at the truth than to get an answer over the open internet.
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I always think it's more fun to watch people try to answer them and debate it. They're often wrong, but it's always fun to see the way these things are arrived at.
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The answer to that question is always more complicated than not, because it also includes variables such as operating lineups and speed. I'm willing to bet that a 688 at AA1 is quieter than a Collins at flank.
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It also depends on the frequency of the sounds and the environment in which the submarine is operating. One submarine might have a higher SL at one particular frequency but if that one is lower than the cutoff frequency of the duct in which the two submarines we're comparing are in, then the one's noise might just get soaked up into the ocean, while the other suffers minimal transmission loss for tens of miles.
Sometimes I think people don't always understand the nuances of what they're really asking. Comparing sonar performance can be like comparing fine wines...