The last two files are for when you get sonar coating for your uboat later in the war.
I'm using those sounds and they sound fine to me, better than the default.
However, I've yet to hear them in my career as it's only 1940 and I've been playing the game so well that I haven't been pinged since the war started!
(Just yesterday, in support of the invasion of Norway, a taskforce of an Illustrious and 6 destroyers sailed right into me - and a spread of 4 eels took care of the carrier, followed by a dive to 70m. Destroyers didn't even start pinging and I was far away an hour later!)
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