First, I don't understand why this topic is in this forum, which I don't normally bother to read.

The USN studied the Prinz Eugene sonar and developed it's own submarine mounted system using derived technology. The original system was designated BQR-1. When I served in the 70's we were using the BQR-7; obviously much improved. We didn't consider any sonar to be very useful at 27 knots, including that one. We still manned it, of course, but performance was much degraded. I don't understand why the German system would be so good in the 1940's unless it was using space alien technology. Having said that, you can always have conditions where performance is etraordinary, but the implication here is the German sonar was always like that. Again, I don't understand how that is possible.

I can also say that ships always have their sonar mounted forward for best coverage and distance from power plant noise. This is not something special about Prinz Eugene and does not make own self noise unconsequential. Surface ships in particular have serious issues with noise generated by hull interaction with the surface of the water, especially at high speed. There is also significant vibration which causes all sorts of things on the ship to make noise.