making the Seawolf silent speed of 25 knots and doubling the Kilo endurance

[LoBlo]

SpeedNoise in the thruster dialog represents how much additional "noise" the platform emits at top speed. For example a SpeedNoise of 10 means that at top speed the platform emits (base sound levelnoise) + 10 additional noise points. A SpeedNoise of 20 means the platform will emit (base sound level) + 20 additional noise points.

The lower the value the less additional noise at top speed the platform will exhibit.

If you want to lower the overal noise of the platform its in the "object" dialog in the valuebox Passive Sonar SL.

I loaded DW with the modified object.eod and it loaded and played successfully however as I exit DW to make further adjustment to object.eod file with DWedit, the previous modifications I've made disappeared from the list. The file seemed to have returned to default state.

After you change a value in one of the dialog, be sure to press the "apply" button, or the changes will be discarded when you switch to a different platform (different than the save button).