I don't know much about the in game sound profiles, and I haven't played around with the fancy american subs, but in RA mod when I'm playing my Akula, and I'm trying to be stealthy, I'm down to 5 knots. But I set my speed based on the situation and what I'm up against. If I'm running against an old noisy Han running at full speed, I have no issue running at 10 knots. If I'm up against a seawolf or a 212 at fairly close range. I'm down to 3 knots and have my ears on him waiting to see a transient spike or the whine of a torpedo.
But then again, I'm also not the greatest sub captain in history, and have to bless the speed and acceleration of russian SSNs for getting me out of my messes.
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Americans make better submarines? No my friend, Russia makes better submarines, Americans just make better computers 
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