I totally believe it's possible. But there are degrees in all things, air-to-water coupling is not perfect (or consistent, I would guess, being affected by surface conditions), and I would bet that Bear>P-3>C-295. Moreover, turbofans (including the CFM56) can have their own quirky bees-in-an-oil-drum noises, particularly in the front sector.
And until you can quantify that I don't think that the people approving the spec are going to give it much weight.