[cdnus]

Steve,
Do you have a before & after comparison or did you install the cones from the get go?
Their site claims a 1-3 DB reduction---not much if the noise level is very high.
I should mention that I went with the 2 1/2" core not the 3" because I wanted a somewhat bearable sound level & to start with thats exactly what I had.
The reason I mention this is the 2 1/2" has a even more pronounced step @ the core, perhaps causing even more internal turbulance creating the strange sounds.

Craig