NAS panel had to compress Channel 2 by .91 factor

[GKnoll]

The NAS panel created spectograms of the "hold everything secure until
homicide and other investigator can get there" for both Channel 1 and
Channel 2. They found that they had to compress the Channel 2 spectogram
by a factor of .91 to obtain the best correlation with the same phrase
on Channel 2.

See the caption for Figure B-6 at the following link (That would be page
107 of the report)
http://mcadams.posc.mu.edu/odell/10264.pdf

[GKnoll]

Post by GKnoll
The NAS panel created spectograms of the "hold everything secure until
homicide and other investigator can get there" for both Channel 1 and
Channel 2. They found that they had to compress the Channel 2 spectogram
by a factor of .91 to obtain the best correlation with the same phrase
on Channel 2.
See the caption for Figure B-6 at the following link (That would be page
107 of the report)
http://mcadams.posc.mu.edu/odell/10264.pdf

Here is another extremely intesting article about many things acoustic,
by Gary Mack, including the length of time before the recording machines
turned themselves off, how the power hum responds before starting up and
before turning off. And much more

http://jfk.hood.edu/Collection/Weisberg%20Subject%20Index%20Files/M%20Disk/Mack%20Gary%20Cover-up/Item%2002.pdf