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Multi-Way Conventional loudspeakers with crossovers

calculations for spherical enclosure.
calculations for spherical enclosure.
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Old 4th October 2018, 03:12 AM   #1
Aucosticraft is offline Aucosticraft  India
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Default calculations for spherical enclosure.

Can someone please help me with calculations for designing spherical enclosure? I thought a lot but couldn't think of any clear equation or approach.
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Old 4th October 2018, 12:59 PM   #2
Galu is offline Galu  Scotland
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Calculating/designing what precisely? Please supply more information on your intended project.
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Old 4th October 2018, 11:59 PM   #3
hollowboy is online now hollowboy  Australia
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? the volume of a sphere is:

[I was going to provide a link, but no... just type "volume of sphere" into an internet search]

...but most DIY spheres are built on found objects, and are not perfect spheres.

For example, if you want a 70 litre sphere, I think your best approach is to find an 80 litre fibreglass plant pot (or similar), and base your build on that.
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Old 5th October 2018, 12:21 AM   #4
Upfront is online now Upfront  Australia
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Yoga balls come in many different sizes too. Plaster one half and it would make a very simple half mould for a fiberglass, carbon fibre or any other material sphere you wanted.
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Old 5th October 2018, 01:03 AM   #5
Galu is offline Galu  Scotland
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Hold fire colleagues - we don't know exactly what Aucosticraft is asking for yet!
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Old 5th October 2018, 07:39 AM   #6
Upfront is online now Upfront  Australia
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Hard to not get excited about spherical speakers. I think all DIYer have, at the very least, contemplated building some.
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Old 5th October 2018, 07:45 AM   #7
scottjoplin is offline scottjoplin  Wales
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Fine if it's spherical on the outside, not fine if it's spherical on the inside
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Old 5th October 2018, 09:23 AM   #8
avtech23 is offline avtech23  Australia
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calculations for spherical enclosure.
Quote:
Originally Posted by scottjoplin View Post
Fine if it's spherical on the outside, not fine if it's spherical on the inside
What affect would internal sphericity have on the sound?
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Old 5th October 2018, 12:40 PM   #9
krivium is offline krivium  France
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Hi,
A strong mode behavior ( standing wave ) starting at 1/4 the inner diameter. Theoricaly very difficult to manage, in practice it seems it could be done but you'll have compromise ( lot of absorbent material needed, potentiality to load the driver too much (overdamp it).

That said if you are strategic and ready to use some coax driver and make wise choice about crossover freq this could be approximated:
cabasse la sphere - Google Search

cabasse la sphere - Google Search
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Old 5th October 2018, 01:03 PM   #10
Galu is offline Galu  Scotland
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We may be having a ball (pun intended!) with this idea, but what could the OP be looking for in terms of "calculations for designing spherical enclosures"?
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