At 11:56 PM 9/9/96 -0400, you wrote:
> Here I am again, filled with questions. ;) It's always the same:
>once a puzzle gets in my head it won't go away until I get an answer...
>
> This time, I'm curious about installing a quality (at least 4
>speakers) stereo system in a B roadster, without cutting any metal. Has
>anyone out there accomplished this? If not, any ideas? I don't want to
>create a rattling boom-mobile (heaven forbid), but I'd like something with
>enough power to sound good at 60+ mph with the top down ie. a couple full
>range speakers, directional tweeters, and maybe even an 8 inch subwoofer or
>two. Any thoughts?
>
>Thanks,
>
>J
>
> ________________________
>[ JASON DUTT ]
>[ simjason@ix.netcom.com ]
> \----------------------/
> \ 1972 MGB Roadster /
> \__________________/
>
Unless you can mount the tweeters so they are aimed at your ears, don't even
bother. The directivity of a piston sound source is (if I remember right) :
theta = .61*lambda/a*a
where, theta is the half angle, lambda is the wavelength, and a is the
effective radius of the transducer. A typical tweeter at 10 khz has a main
beam angle of approximately 10-20 degrees. Most people mount these in the
door and beam the sound right into their knee. Instead spend your money on
a better built mid range that will survive the heat of the automobile
environment.
Don Mathis,Ph.D.
LUCENT TECHNOLOGIES
donmathis@lucent.com
'61 MGA '37 Bentley
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