hi roch
i´m interested too in designing something spherical. if possible i would choose the seas Tr18. a coax is probably the only choice, or you take some broadband driver.
for the enclosure my idea would have been to take glass-fiber or sliced wood in shapes that build a sphere together. the fiber should be reinforced with wood too. no more thoughts about it at the moment.
greets
i´m interested too in designing something spherical. if possible i would choose the seas Tr18. a coax is probably the only choice, or you take some broadband driver.
for the enclosure my idea would have been to take glass-fiber or sliced wood in shapes that build a sphere together. the fiber should be reinforced with wood too. no more thoughts about it at the moment.
greets
I've forgotten the name of it, but there is a tube that is used for pouring cement columns,.......Spiro-tube, or something to that effect. It has been used several times recently by DIYers. I assume it is strong enough to work for you, and you can get it in different diameters too.
Oh, I remember, SonoTube. I assume that you can get it locally without any trouble.
Oh, I remember, SonoTube. I assume that you can get it locally without any trouble.
I designed these for a project at work...
Fostex F200A in a steel sphere
Once damped these sounded amazingly fast and open. I wish I could afford a pair for use at home!
Fostex F200A in a steel sphere
Once damped these sounded amazingly fast and open. I wish I could afford a pair for use at home!
Enclosure
Nice low tech solution.
Get a sphrical object of a size your like.... stryo ball, beach ball or etc. Can't find the right size, then make one of paper mache.
Then lay up a fiberglass cloth and resin shell over the ouside of said object. Test first to be sure your resin doesn't ruin the form.
When done, either dig the form out of the shell or split the shell, remove the form and reglass the shell, adding driver mounting details in the process.
Cyclotronguy
Nice low tech solution.
Get a sphrical object of a size your like.... stryo ball, beach ball or etc. Can't find the right size, then make one of paper mache.
Then lay up a fiberglass cloth and resin shell over the ouside of said object. Test first to be sure your resin doesn't ruin the form.
When done, either dig the form out of the shell or split the shell, remove the form and reglass the shell, adding driver mounting details in the process.
Cyclotronguy
Ok, I did a google search on Sonotube and speakerbuilding and I came up with the following:
Building a Sonotube Subwoofer
Sonotube FAQ for speakerbuilding
This one is from AudioKarma, and is about 5 years old, Building an Acoustic Wave Cannon
Sonotube Sub Design Help
Where to buy Sonotube for building a subwoofer?
DIY Project # 11 - A Subwoofer Made from Sonotube and the Hsu 12" Driver - September, 1999
And from right here at DIY
Sonotube RL-p15 Project with questions...
"SDSS 1.1"
Single-Driver, Ported Tube Speakers
Ok, that should be enough for anyone as a starter. YOu can Google for more information. Just insert Sonotube in the search, and you will find much more.
Building a Sonotube Subwoofer
Sonotube FAQ for speakerbuilding
This one is from AudioKarma, and is about 5 years old, Building an Acoustic Wave Cannon
Sonotube Sub Design Help
Where to buy Sonotube for building a subwoofer?
DIY Project # 11 - A Subwoofer Made from Sonotube and the Hsu 12" Driver - September, 1999
And from right here at DIY
Sonotube RL-p15 Project with questions...
"SDSS 1.1"
Single-Driver, Ported Tube Speakers
Ok, that should be enough for anyone as a starter. YOu can Google for more information. Just insert Sonotube in the search, and you will find much more.
Two IKEA bowls put together:
http://www.faktiskt.se/modules.php?...torder=asc&highlight=kloth%F6gtalare&start=60
And with a little bit more work the beautiful(scroll down):
http://www.faktiskt.se/modules.php?...torder=asc&highlight=kloth%F6gtalare&start=30
http://www.faktiskt.se/modules.php?...torder=asc&highlight=kloth%F6gtalare&start=60
And with a little bit more work the beautiful(scroll down):
http://www.faktiskt.se/modules.php?...torder=asc&highlight=kloth%F6gtalare&start=30
The one critical question hasn't been asked by anyone - How big?
Softball? Soccer Ball? Beach Ball? Deep Sea Diving Sphere?
Somewhere here in this grup is a link to a South American guy who build 'snail shell' shaped woofers. Similar to these Bower Wilkins Nautilus speakers -
http://www.bowers-wilkins.co.uk/display.aspx?infid=1729&terid=2003
He built a central frame with speaker mounts out of MDF, then added ribs. He filled the gaps on the inside with fiberglass lay-up, then did the same to the outside.
Is your project on this scale that you could fabricate a framework and fill in the gaps?
Steve/bluewizard
Softball? Soccer Ball? Beach Ball? Deep Sea Diving Sphere?
Somewhere here in this grup is a link to a South American guy who build 'snail shell' shaped woofers. Similar to these Bower Wilkins Nautilus speakers -
http://www.bowers-wilkins.co.uk/display.aspx?infid=1729&terid=2003
He built a central frame with speaker mounts out of MDF, then added ribs. He filled the gaps on the inside with fiberglass lay-up, then did the same to the outside.
Is your project on this scale that you could fabricate a framework and fill in the gaps?
Steve/bluewizard
hello.
A styrofoam ball will not withstand a concrete pour, concrete's wet mass, hydrostatic pressure, nor will it stay submerged if done in halves. And styrofoam is porous.
You will have better chance of success if you do this in spherical halves and then join them. This is quite easy to fabricate with moderate success, and also offers easy assembly of your internals as well as design potential for a contrasting center piece / partial stand support.
For the cavity try a bowling ball, 5 or 10 pin depending on required spherical volume. You can drill into it and insert mold supports.
For the shell visit restaurant supply store and select a large stainless steel mixing or maybe even a large wooden salad bowl. Even with this I would suggest fully setting it in sand or water as setting concrete's hydrostatic pressure is immense.
Read up on concrete kitchen countertops and furniture. Commercial readimixes are available for very fine, dense and coloured concrete including how-to guides: concrete pouring for dummies!
A styrofoam ball will not withstand a concrete pour, concrete's wet mass, hydrostatic pressure, nor will it stay submerged if done in halves. And styrofoam is porous.
You will have better chance of success if you do this in spherical halves and then join them. This is quite easy to fabricate with moderate success, and also offers easy assembly of your internals as well as design potential for a contrasting center piece / partial stand support.
For the cavity try a bowling ball, 5 or 10 pin depending on required spherical volume. You can drill into it and insert mold supports.
For the shell visit restaurant supply store and select a large stainless steel mixing or maybe even a large wooden salad bowl. Even with this I would suggest fully setting it in sand or water as setting concrete's hydrostatic pressure is immense.
Read up on concrete kitchen countertops and furniture. Commercial readimixes are available for very fine, dense and coloured concrete including how-to guides: concrete pouring for dummies!
Hi
Spheres, did you say ? B&W was not a precursor. Here's a real collection :
http://www.passion-elipson.com/html/photos1.htm
to
http://www.passion-elipson.com/html/photos1.htm
How they were made :
http://www.passion-elipson.com/html/articles/hifi0091979.htm
Walking through the site, you'll find a lot of documentation.
Spheres, did you say ? B&W was not a precursor. Here's a real collection :
http://www.passion-elipson.com/html/photos1.htm
to
http://www.passion-elipson.com/html/photos1.htm
How they were made :
http://www.passion-elipson.com/html/articles/hifi0091979.htm
Walking through the site, you'll find a lot of documentation.
For a bigger mould an exercise ball would be cheap .
I made a pair of cheap speakers using IKEA vase (12.95 €) and Tangband W3-871S drivers (~20 €). Internal volume is about 6,5 litres and the neck/mouth gives Fb=75 Hz. I intend to add some bitumen inside to reduse ringing of the enclosure but the enclosure sounds quite dead allready with some polyfill in it.
IKEA steel bowls look great also and there are many sizes.
I made a pair of cheap speakers using IKEA vase (12.95 €) and Tangband W3-871S drivers (~20 €). Internal volume is about 6,5 litres and the neck/mouth gives Fb=75 Hz. I intend to add some bitumen inside to reduse ringing of the enclosure but the enclosure sounds quite dead allready with some polyfill in it.
IKEA steel bowls look great also and there are many sizes.
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