Will O'Brien wrote:
>
> >Joe Curry wrote:
> >>
> >> Julian,
> >> I have two oval 8" dual coaxial speakers mounted on that removable panel
> >>behind the
> >> seats on my '63 Spit. The aftermarket panel is strong enough to support
> >>the weight
> >> of the panels with no noticable effect. The sound is adequate,
> >>considering that
> >> the Spit is noisy on its own and the speakers have to compete with the
>Monza
> >> Exhaust system. However, It seems to be the only logical space to mount
>the
> >> speakers and get proper separation.
> >>
> >> If it is a problem with sound bleeding out the back and around the
> >>edges, you can
> >> install covers behind the speakers to trap the sound. I would fabricate
> >>them out
> >> of some kind of heavy cardboard and line with foam rubber.
> >>
> >> BTW, I don't have the details of your Spit for the International
> >>Spitfire database
> >> I am compiling. Please provide the following.
> >>
> >> Year
> >> Model
> >> Color
> >> Commission Number
> >> Owner
> >> Location (City, County, Country)
> >>
> >> Regards,
> >> Joe Curry
> >>
> >> J.Daley wrote:
> >>
> >> > I've just got a new radio/cassette for my Spit 1500 and am trying to
> >> > optimise the position of the speakers. At the moment I have 2 speakers
> >> > in the rear panel behind the seats. This is not ideal, as far as I can
> >> > see, for at least two reasons
> >> >
> >> > 1. The panel is very flimsy.
> >> > 2. The panel is not well sealed so that sound from the rear of the
> >> > speaker can leak round the edges.
> >> >
> >> > So from a theoretical point of view this setup should sound pretty bad,
> >> > although it may be that if the leaks are small compared to the volume of
> >> > the boot (of course the petrol tank is in the way) this problem is a
> >> > small one. Has anyone got any practical experience ? Would reinforcing
> >> > the panel with some plywood or something make much difference ?
> >> >
> >> > I'd also like to put a pair of speakers in the doors, but looking at
> >> > it, it looks like there is very little room. Again, has anyone played
> >> > around with door speakers ?
> >> >
> >> > I'm not looking for the ultimate in high fidelity, just something that
> >> > doesn't sound too offensive.
> >> >
> >> > Julian.
> >> >
> >> > [Third attempt - Does majordomo reject mail if the From: field doesn't
> >> > match a subscriber to the list ? I usually send mail from a different
> >> > account to the place I read mail, so that may be the problem.]
> >> >
>
>>__________________________________________________________________________
> >>_____
> >> > Julian Daley, Dept Phonetics, University College London
> >> > _______________________________ j.daley@ucl.ac.uk
> >>_____________________________
> >>
> >> --
> >> "Thanks to the Interstate Highway System, it is now possible
> >> to travel across the country coast to coast without seeing
> >> anything." -- Charles Kuralt
> >
> >
> >Depending on the size of the speakers (i.e., around 6 inches in diameter),
> >mounting them
> >on the rear side panels is not really a problem. Those cardboard pieces
> >don't have a
> >lot of strength, but enough for this purpose.
> >
> >As for fitting covers to the backs of the speakers, Joe, I believe this
> >would only
> >reduce their effiency. Speaker cones vibrate on two sides -- the front
> >and the back.
> >Enclosing the back is fine, as long as your create a port on the front
> >mounting surface
> >so as to relieve the back pressure -- i.e., "sound" -- coming from the
> >backside of the
> >speaker cone.
> >
> >More to the point -- it don't hardly make no damn difference when you
> >driving with the
> >top down, the tailpipe blaring, and the rattles rattlin'.
> >
> >--
> >Martin Secrest
> >74 Spitty
> >73 GT6
> Martin,
> I hate to burst your bubble. There are actually two kinds of
> enclosures. One is a sealed enclosure. This type performs better through
> the entire range of sound, while a ported or vented enclosure allows a
> speaker to perform better in the lower ranges. Did you ever notice on
> decent speakers at the store, the three way speakers that have a tweeter,
> midrange, and woofer will usually have a port, while the smaller two way
> enclosures are usually sealed.(On the decent ones) The two way boxes have
> a full range speaker as well as a tweeter to create the sounds in the
> higher ranges.
>
> Will
>
> ___________________________________________________________
> Will O'Brien
> OS Design & Consulting
> email: hobrien@webos1.com
> alt email: will@students.missouri.edu
> ___________________________________________________________
Aw hell, burst away. Now that you mention it, of course I've seen
enclosed speakers, but you've left me hanging, Will ... why does porting
improve a three-way speaker, but degrade a two-way box of lower frequency
capability? Inquiring minds want to .. you know ... know.
--
secrest
|