Return-Path: Received: from mta6.snfc21.pbi.net ([206.13.28.240]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Sun, 2 Apr 2000 15:57:38 -0400 Received: from pacbell.net ([207.212.134.237]) by mta6.snfc21.pbi.net (Sun Internet Mail Server sims.3.5.2000.01.05.12.18.p9) with ESMTP id <0FSE0045SNADPD@mta6.snfc21.pbi.net> for lancair.list@olsusa.com; Sun, 2 Apr 2000 12:54:14 -0700 (PDT) Date: Sun, 02 Apr 2000 12:51:21 -0700 From: The Alarm Guys Subject: ANR Headsets To: lancair.list@olsusa.com Message-id: <38E7A4B9.A46C39A1@pacbell.net> Organization: Pacific Bell Internet Services X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Just a quick note about this subject on ANR Headsets. Earl Schroeder is correct. Most people think that ANR is supposed to cancel 15-25db of noise. To simplify things, ANR is a process in which a band of frequency (1K hz down) is "re-played" back into the earpiece 180 degrees out of phase. ANR headsets work well at reducing cockpit noise if the unwanted noise is in that frequency range. If you want to demonstrate to yourself the effect ANR has in a headset, reverse the speaker wires (at the speaker) on one of your home stereo speakers. This will cause one speaker to "push" the speaker driver out while the reversed one will "pull" the driver in. The effect is a cancellation of bass and mid-bass frequencies. I personally fly with an ANR headset and absolutely love it (Flightcom Denali) but it boils down to the application you are using them in. Hope this helps. Kirk Hammersmith >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>