B A R R Y wrote:
On Mon, 16 Jan 2006 21:13:43 GMT, Dave S
wrote:

Most noise suppression occurs in lower frequencies, both with ANR and
the passive devices.


Where did you ever get that idea about passive devices?

Check out the table at the bottom of:
http://www.aearo.com/pdf/hearing/OSHAComplyPackSellSheet.pdf

It's the attenuation chart for EAR foam earplugs.

In the case of these devices, attenuation starts to drop off as you
go down below 250 Hz, and there's a hole at 2k.




Thanks for the point out.. I was given bad info. You are right.

Dave