You're using GHG's then?
Their only bug is, they are switched off when surfaced. The baffle front and aft is correct.
You may want a KDB to get rid off the blind spot straight ahead.
Correctly made in SH3. And of course off when surfaced...
Some short info on hydrophones:
http://www.uboataces.com/hydrophones.shtml
or american:
http://www.maritime.org/fleetsub/sonar/chap1.htm#1A