Return-Path: Received: from outbound-mail.nyc.untd.com ([64.136.20.164] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with SMTP id 551781 for flyrotary@lancaironline.net; Tue, 30 Nov 2004 18:32:17 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.136.20.164; envelope-from=jbker@juno.com Received: from outbound21-sr.nyc.untd.com (webmail04.nyc.untd.com [10.141.27.144]) by smtpout02.nyc.untd.com with SMTP id AABA44AXJAPC6ZFS for (sender ); Tue, 30 Nov 2004 15:30:48 -0800 (PST) X-UNTD-OriginStamp: Y+Mfppm2QyGfnY/dq+iW1Y+K2Jex0JNRGyKFXF/PoopQHU/UmQc4XA== Received: (from jbker@juno.com) by webmail04.nyc.untd.com (jqueuemail) id KDQK6QEC; Tue, 30 Nov 2004 15:30:01 PST Received: from [4.234.135.68] by webmail04.nyc.untd.com with HTTP: Tue, 30 Nov 2004 23:29:49 GMT X-Originating-IP: [4.234.135.68] Mime-Version: 1.0 From: "jbker@juno.com" Date: Tue, 30 Nov 2004 23:29:49 GMT To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] New Muffler Design (Noise reduction) X-Mailer: WebMail Version 2.0 Content-Type: text/plain Message-Id: <20041130.153001.19762.22511@webmail04.nyc.untd.com> X-ContentStamp: 2:1:3636020052 Ed A wrote: For you sound experts, I presume if a 3DB increase represents a perceived doubling of loudness does that mean a 10 DB decrease represents an approx 3 fold decrease in perceived loudness?? ---______________________________________________________ Do not claim to be a noise expert, but did some measurements on the P&W jets over the years. If you cut the noise 10 Db, I think that is 1/8 the perceived noise (1/2X1/2X1/2= 1/8) Bernie