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From: "Jack Ford" <jackoford@theofficenet.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-551846@logan.com>
Subject: Re: [FlyRotary] Re: New Muffler Design
Date: Tue, 30 Nov 2004 17:45:28 -0800
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Charlie,
Very interested. Please provide some details
Jack Ford

----- Original Message ----- 
From: "Charlie England" <ceengland@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, November 30, 2004 4:49 PM
Subject: [FlyRotary] Re: New Muffler Design


> Bill Dube wrote:
> <Snip>> 
> And from a guy who did pro sound work in a former life: the 3dB drop is 
> indeed 1/2 the *power* but is typically just noticeable as a change to 
> the average ear. The 10dB decrease is 1/10 the power, but is perceived 
> as being 1/2 the sound level by an average ear. (This is worth 
> remembering when the stereo sales guy tries to convince you that 
> 100watts is twice as good as 50watts.)
> 
> Bottom line, if you got a 10dB decrease, your plane should seem 1/2 as 
> loud to the listener, an impressive accomplishment.
> 
> Way to go Ed!
> 
> Charlie
> 
> BTW, which weighting are you using? If memory serves, the 'A' weighting 
> is an almost worthless measurement for working on protecting your 
> hearing. (details if anyone is interested)
> 
> 
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> 
>