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HoopsOnToast
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#1 Posted: Wed Feb 20th, 2008 02:25 pm |
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anyone have any?
http://www.ikea.com/gb/en/catalog/products/80057257
thinking of using them, paired up for a cheap sphere enclosure, the 20cm one for the Bandor 50mm and the 28cm for a seas Aluminium 5" bass driver powered by sub amp.
how thick are they?
Ta 
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earlofsodbury
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#2 Posted: Wed Feb 20th, 2008 02:33 pm |
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godnose, but that's a nifty bit of lateral thinking 
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murray johnson
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#3 Posted: Wed Feb 20th, 2008 02:49 pm |
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the 28 cm ones will still only give a volume of 2 Litres or so.
How much do you need?
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HoopsOnToast
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#4 Posted: Wed Feb 20th, 2008 03:01 pm |
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ah, i worked it out that the 28cm one would give around 10L and the 20cm one with around 3L 
thats why i need to know the exact thickness etc ;)
Ta 
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technobear
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#5 Posted: Wed Feb 20th, 2008 04:47 pm |
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Interesting idea
I would have thought 3L was more than enough for the little Bandors - probably too much. A Jordan JX92S only needs 3L (assuming closed box).
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murray johnson
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#6 Posted: Wed Feb 20th, 2008 05:03 pm |
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my mistake. I did think it looked wrong 
Vol of a sphere is 4/3 Pi r cubed
1.333 x 3.142 x 0.13 x 0.13 x 0.13 = 0.009 Mcubed or 9L
9 Litres (less what the driver displaces) might still be enough.
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HoopsOnToast
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#7 Posted: Wed Feb 20th, 2008 06:07 pm |
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yup, modeled in WinISD, the Bandor will be fine in the 20cm one, may need to make it a little smaller (stuffing, sealent etc) and the 28cm one (9L ish) should be fine for the Seas Woofer
went and got 4 of the 20cm bowls for the bandor first, to try them out, hopfully get them together before the end of the week :dude:
here are the parts list -
Attachment: Photo-0069.jpg
(Downloaded 733 times) Last edited on Wed Feb 20th, 2008 06:32 pm by HoopsOnToast
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HoopsOnToast
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#8 Posted: Wed Feb 20th, 2008 06:36 pm |
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and a mock up of the sphere
need to mount the Bandor on a round disk, which should make it easier to mount it to the sphere 
i quite like the patchwork look of the different shades of birch wood :dude:
Attachment: Photo-0070.jpg
(Downloaded 732 times)
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earlofsodbury
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#9 Posted: Wed Feb 20th, 2008 08:19 pm |
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ironic you should have chosen one of few drivers with a square faceplate :lol:
will be watching this build with interest - you certainly do think outside the box in every possible sense!
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HoopsOnToast
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#10 Posted: Thu Feb 21st, 2008 02:57 am |
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yeah, although ive had the bandors for a while, did think about getting some 80mm full range drivers (plenty to chose from) with a round frame, but that really defeats the project ;)
just a bit of fun for now, but who knows where it will end up
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icehockeyboy
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#11 Posted: Fri Feb 22nd, 2008 01:34 pm |
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Back in the 70's I worked for a company that sold spherical speakers made out of glass................................Goldfish bowls!!!!!!
They actually sounded amazing, using a 4 1/2" full range driver that was basically the same unit as used in the Bose 901 at the time.
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HoopsOnToast
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#12 Posted: Fri Feb 22nd, 2008 04:50 pm |
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got the cabs done today, took only a few hours -
glued together, should get them hooked up by tonight
and with some blue foam as a base/support
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HoopsOnToast
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#13 Posted: Fri Feb 22nd, 2008 06:52 pm |
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got them all wired in and well, they just sound.......brilliant......
Attachment: PICT0025.JPG
(Downloaded 646 times) Last edited on Fri Feb 22nd, 2008 07:04 pm by HoopsOnToast
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HoopsOnToast
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#14 Posted: Fri Feb 22nd, 2008 07:15 pm |
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together
Attachment: PICT0030.JPG
(Downloaded 642 times) Last edited on Fri Feb 22nd, 2008 07:17 pm by HoopsOnToast
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felix
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#15 Posted: Fri Feb 22nd, 2008 09:12 pm |
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NIce!
Since I have two unused pairs of 50mm Bandors to hand I must give this a go... how do these sound?
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HoopsOnToast
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#16 Posted: Fri Feb 22nd, 2008 09:17 pm |
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yup, they are brilliant, love em to bits
very simple, only took about 3 hours in total (not all at once though)
and if you dont end up doing anything with your pair, i would be happy to take them off your hands ;)
played 'Kila' - 'Luna Park' (one of my reference tracks, Technobear and Earl might remember it from Earls bake off a while ago ;)) and just sounded brilliant, so real
Last edited on Fri Feb 22nd, 2008 09:25 pm by HoopsOnToast
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enbee23
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#17 Posted: Fri Feb 22nd, 2008 10:15 pm |
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I'm well impressed, simple ideas are often the best.
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The Swedish Chef
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#18 Posted: Fri Feb 22nd, 2008 10:21 pm |
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I think they're a brilliant idea, great looking too. I take it they are full range driver, therefore no need for a crossover?
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HoopsOnToast
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#19 Posted: Fri Feb 22nd, 2008 10:24 pm |
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yup a single 50mm metal cone, no crossover, quite inneficient, guessing around 82dBish, and cant really go that loud but sound simply wonderfull with vocals and the like
need to be 'finished' sometime, the mdf front baffle will probably be covered in felt or somthing, then they need a good sand down and varnished or whatever, not too bothered about the final looks to be honest, probably a bit of a trend in my DIY stuff
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bertie
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#20 Posted: Fri Feb 22nd, 2008 11:10 pm |
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Hoops that is such a good idea, I have been after some little speakers for my room at Uni and these sound perfect/easy. Do you mind me asking how much they cost to build all in? Also how did cut the circle out of the bowls???
Thanks
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