If you are looking to mount tweeters, I believe you can mount them on
the top of the dash directed at the windshield (windscreen). The high
frequencies produced by the tweeters will bounce of the hard glass surface
into your music wanting ears. No need for fancy placement formulas used in
those snooty land yachts, wer're talkin' B's.
To get the proper resonance for the low and mid ranges, you need volume
(or as Dr. BOSE did it in my 901s, speaker surface area and smarts). If you
have an early B with a removable top, you could construct a custom speaker
box and place behind the seats. A combination of speakers, sound vents and
wood should do the trick. Use a cross-over network to tap off the high
freqs for the afore mentioned dash-mounted tweeters and you be jammin'. I
think I'll try this myself; I could out blast the Hip-Hop crowd with some
SRV (might need to look at the power requirements, I'd hate to kill the
engine while listening to "Voodoo Chile").
Cheers,
R. John Fagerlund
(An engineer who thinks over-engineering has sunk many a system. Do what is
required to get the job done properly and insure it can be economically
supported).
'65 B
'66 BGT
'96 Pinarello
>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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