Spherical Speakers

Ironhead · 19th December 2007, 04:06 PM

Hi,

I am planning on building a pair of spherical speakers using W3-871SC Full Range drivers. I know a sphere front and a tapered tube for the back is better than a sphere but I'm going with the sphere because of how I want it to look. I want to know if porting it would be practical instead of leaving it sealed. Also what method should I use to reduce resonances? The internal diameter will be 8-1/2 inches. I will use Tuf Cal plaster as the enclosure material.

smallangryboy · 20th December 2007, 01:33 PM

I used Jordan JX92s in a sealed 3 litre enclosure to create my spheres. Though I got the enclosures hand turned out of American Black Walnut [beyond my skill]

They sound excellent when positioned near a wall, and with a matching sub woofer do justice to any CD or DVD !

I found that porting wasn't really necessary [and would have been difficult in such a small enclosure]

The shape itself tends to reduce any sort of problem with resonance, and stuffing it lightly with polyester wool gives good results with the mid range.

Good luck with your spheres, post some images when your done !!!

sreten · 20th December 2007, 05:01 PM

Hi,

I get around 4 litres for your sphere. Zaphs measurements for
3" drivers all have Vas < 1 litre and ~ 1/2 specified values.
Reflexing is pointless with typical Qts values. 2L to 3L sealed.

W3-871s over bright.

/sreten.

P.S. I have a zipped file for Zaph's article.

Ironhead · 20th December 2007, 05:47 PM

Beautiful speakers smallangryboy. And thanks for the advice from both of you. I used win isd to get the Vb of my enclosure then I used a calculator I made to calculate the same size sphere that would need to give me that internal volume. I asumed that this program was accurate but I don't know. I noticed that win isd takes into acount measurements from small speakers more accurately than many online calculators that just aproximate the measurements for smaller speakers based on some kind of size limit. ex. smaller than 4 or 5 inches.

TNT · 20th December 2007, 06:43 PM

Ikea ? :-)

http://www.diyaudio.com/forums/showt...942#post989942

/

Ironhead · 21st December 2007, 01:00 AM

Awesome. What did you use to make them?

GuyPanico · 21st December 2007, 01:23 AM

My little spheres

A few pics of my finished B3N mini spheres

Ironhead · 21st December 2007, 04:15 AM

Nice!

Made out of bowls from Target eh. I thought about using some bowls from under our sink today as making them with plaster would take too long (because of waiting for the plaster to be delivered). And cost much more than I really want to spend. I'm sure someone would have been angry if I did.lol

smallangryboy · 21st December 2007, 08:22 AM

TNT

Lovely ! I wanted to make a matching sub woofer fro my spherical speakers, but couldn't get over the logistics , do you have some instructions about how you went about making your metal enclosure, and a parts list

el`Ol · 21st December 2007, 11:11 AM

Not mine, found them in the Manger DIY zone:

19th December 2007, 04:06 PM	#1
Ironhead diyAudio Member Join Date: Dec 2007	Spherical Speakers Hi, I am planning on building a pair of spherical speakers using W3-871SC Full Range drivers. I know a sphere front and a tapered tube for the back is better than a sphere but I'm going with the sphere because of how I want it to look. I want to know if porting it would be practical instead of leaving it sealed. Also what method should I use to reduce resonances? The internal diameter will be 8-1/2 inches. I will use Tuf Cal plaster as the enclosure material.

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20th December 2007, 05:47 PM	#4
Ironhead diyAudio Member Join Date: Dec 2007	Beautiful speakers smallangryboy. And thanks for the advice from both of you. I used win isd to get the Vb of my enclosure then I used a calculator I made to calculate the same size sphere that would need to give me that internal volume. I asumed that this program was accurate but I don't know. I noticed that win isd takes into acount measurements from small speakers more accurately than many online calculators that just aproximate the measurements for smaller speakers based on some kind of size limit. ex. smaller than 4 or 5 inches.

20th December 2007, 06:43 PM	#5
TNT diyAudio Member Join Date: Apr 2003 Location: Sweden	Ikea ? :-) http://www.diyaudio.com/forums/showt...942#post989942 /

21st December 2007, 01:00 AM	#6
Ironhead diyAudio Member Join Date: Dec 2007	Awesome. What did you use to make them?

21st December 2007, 01:23 AM	#7
GuyPanico diyAudio Member Join Date: Mar 2005 Location: Euless, TX	My little spheres A few pics of my finished B3N mini spheres

21st December 2007, 04:15 AM	#8
Ironhead diyAudio Member Join Date: Dec 2007	Nice! Made out of bowls from Target eh. I thought about using some bowls from under our sink today as making them with plaster would take too long (because of waiting for the plaster to be delivered). And cost much more than I really want to spend. I'm sure someone would have been angry if I did.lol

21st December 2007, 08:22 AM	#9
smallangryboy diyAudio Member Join Date: Dec 2004 Location: Oxfordshire	TNT Lovely ! I wanted to make a matching sub woofer fro my spherical speakers, but couldn't get over the logistics , do you have some instructions about how you went about making your metal enclosure, and a parts list