Tweeter head

picowallspeaker · 10th July 2009, 10:07 AM

Can a single point source be identified in a sphere ?
E=MC2 helps a lot but doesn't help me to find the answer.
The project is to put several drivers on each face of a polyhedron , to guarantee a correct sound reproduction and not to cause interference between drivers. These shall be low power tiny tweeters connected serial-parallel ,if the average impedances available on the market are used .
Anyone has experience on this ?
What should be the polyhedron -or mix of different- form?
For a start ,I choose for simplicity to place 6 drivers , but I suspect their number can rise .
edit>A sphere would also be a good choice...

picowallspeaker · 10th July 2009, 11:39 AM

Just waiting for someone to say:
"yeah, stick a dozen of mean tweeters to that soccer ball you have!"

bjorno · 10th July 2009, 04:45 PM

Quote:

..Just waiting for someone to say: "yeah, stick a dozen of mean tweeters to that soccer ball you have!"..

Hi, You nailed it!I'm the someone!

I've made quite a few in the early seventies used as center attractor speakers hanged from the ceiling at ear height.

A plastic 15 cm diameter ball could accommodate 24 Seas 2” 5 TV HF-8 cone tweeter drivers that only could be used above 5 kHz.

If I remember right, using this sphere size and the mentioned speaker placement: It was impossible to locate any of the individual drivers at the listeners sweet spot .

Some thoughts concerning the size and more : Se picture 1(1)

b

1(1)

picowallspeaker · 10th July 2009, 05:29 PM

well..Thanks Bjorno. Your interest brought me to some thoughts:
Modern drivers with soft dome would perform much better
It's not a PA installation , so once made a prototype ,peaks and dips could be corrected via proper cells in the crossover.
Yes , the size is right ! about 10-15 cm is where I'm moving to ,placed on the top of the cabinet that accomodates the woofer
MAA must be Mutual Acoustic Amplification , right? I was concerned only in possible diffractions that would lend to "beaming",so analisying only one channel without verifying the centering of a stereo image would be ok.
The sphere is avoided.I'm thinking of strange sums of polyhedrons,with a very scary look!

10th July 2009, 10:07 AM	#1
picowallspeaker diyAudio Member Join Date: Apr 2007	Tweeter head Can a single point source be identified in a sphere ? E=MC2 helps a lot but doesn't help me to find the answer. The project is to put several drivers on each face of a polyhedron , to guarantee a correct sound reproduction and not to cause interference between drivers. These shall be low power tiny tweeters connected serial-parallel ,if the average impedances available on the market are used . Anyone has experience on this ? What should be the polyhedron -or mix of different- form? For a start ,I choose for simplicity to place 6 drivers , but I suspect their number can rise . edit>A sphere would also be a good choice...

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10th July 2009, 11:39 AM	#2
picowallspeaker diyAudio Member Join Date: Apr 2007	Just waiting for someone to say: "yeah, stick a dozen of mean tweeters to that soccer ball you have!"

10th July 2009, 05:29 PM	#4
picowallspeaker diyAudio Member Join Date: Apr 2007	well..Thanks Bjorno. Your interest brought me to some thoughts: Modern drivers with soft dome would perform much better It's not a PA installation , so once made a prototype ,peaks and dips could be corrected via proper cells in the crossover. Yes , the size is right ! about 10-15 cm is where I'm moving to ,placed on the top of the cabinet that accomodates the woofer MAA must be Mutual Acoustic Amplification , right? I was concerned only in possible diffractions that would lend to "beaming",so analisying only one channel without verifying the centering of a stereo image would be ok. The sphere is avoided.I'm thinking of strange sums of polyhedrons,with a very scary look!

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