>After reading about the CI 611 CVR initial findings I am curious as to whether CVRs pick up noise via the structure as well as air borne noise?
If they are fairly rigidly mounted to the structure this would enable them to pick up noise which is normally inaudible due to the background ambient noise <
Yes, the CVR picks up structure borne noise via the fixed mike in the cockpit. It also will record spectral signals (played back as noises) which emanate from electrical annomalies in the bus circuits.
I understand that the CVR from 611 has been sent to the NTSB for comparison with hull rupture event CVRs. I'm optomistic that since the CVR lasted a trifle longer than the FDR that it may be of significant interest.