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Oh, ok. Yes, we don't want to put that base in front of the speaker (tee he he).
-Marty
----- Original Message -----
From: Gavin Ehringer
To:
Sent: Sunday, November 28, 2004 10:24 AM
Subject: [SurfGuitar101] Re: 15" Speakers versus 12" versus 10" - some
thoughts...
The error comes in that my calculation of the surface area of a cone included
the base. So,
yes, Marty, you are correct.
Gavin
> > Gavin,
> >
> > Are you assuming a radius of 10" or a diameter of 10"?
> >
> > A 10" speaker has a radius of 5". Using the surface area formula
> for a cone, (Pi)(r)(s), we have approximately (3.14)(5)(5.6) = 84.78
> sq inches. I'm being conservative and assuming that the depth to the
> dome is 2" and that if it were a complete cone, the depth to the tip
> of the cone would be about 2.5". By the Pythagorean theorem, s would
> be 5.6".
> >
> > It's not going to be much different figuring with a 1" diameter
> dome. Using [(Pi)(R)(S) - (Pi)(r)(s)] + (Pi) r^2 where R is the
> radius of the speaker, r is the 2d radius of the dome (not the
> spherical radius), S is the slant height of the speaker, s is the
> slant height of the section of the cone removed due to the center
> dome.
> >
> > [(3.14)(5)(5.6) - (3.14)(.5)(.707)] + (3.14)(.5)^2 = 87.59 square
> inches. This is using approximated values but actual values aren't
> going to be different enough to jump the surface area from 87 sq
> inches up to 163 sq inches.
> >
> > -Marty
> >
> >
> >
> >
> > ----- Original Message -----
> > From: Gavin Ehringer
> > To:
> > Sent: Saturday, November 27, 2004 11:25 AM
> > Subject: [SurfGuitar101] Re: 15" Speakers versus 12" versus 10" -
> some thoughts...
> >
> >
> >
> > No, these are the correct calculations for surface area in square
> inches, based on the
> > radius of each cone.
> >
> > Run the calculations and you shall see!
> >
> > Gavin
> >
> >
> > --- In , "Marty Tippens"
> <mctippens@e...> wrote:
> > > It has to be square inches given that every other dimension is
> given in square inches
> > BUT they can't be for a single speaker. They look about right for
> pairs of speakers at each
> > given diameter. I don't see the rest of Gavin's details in your
> edit of his post.
> > >
> > > -Marty
> > > ----- Original Message -----
> > > From: pwrose@j...
> > > To:
> > > Sent: Saturday, November 27, 2004 4:58 AM
> > > Subject: [SurfGuitar101] Re: 15" Speakers versus 12" versus
> 10" - some thoughts...
> > >
> > >
> > > On Fri, 26 Nov 2004 16:04:20 -0000 "Gavin Ehringer"
> > > <gavinehringer@e...> writes:
> > > > SNIP<
> > > > 10" = 163 sq @ 2" depth.
> > > > 12" = 244.sq. @ 3" depth.
> > > > 15" = 382. sq @ 4.5" depth.
> > > ~~~~~~~~~~~~~~~~~~~~~~~
> > > Gavin,
> > >
> > > sq. what?
> > > can't be inches.
> > >
> > > Bill
> > >
> > >
> > > .
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