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What drivers to load in empty JBL SR4731X boxes
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MarjanM View Drop Down
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Joined: 10 February 2005
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Points: 7816 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2017 at 12:04pm
Originally posted by gen0me gen0me wrote:

Originally posted by MarjanM MarjanM wrote:

Please calculate the combined cone area inside and outside the voice coil. The result same as like 2.93 inch dome shaped cone.

Where have you found info about its cone area?

I measured it.
Marjan Milosevic
MM-Acoustics
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Pasi View Drop Down
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Points: 2732 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pasi Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2017 at 12:36pm
Care to elaborate?

http://www.lean-business.co.uk/eshop/index.php?main_page=popup_image&pID=2730
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gen0me View Drop Down
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Points: 999 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gen0me Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2017 at 1:35pm
Ill just drop my few thoughts.
So relatively to sd the ring is wider than dome. Wont it make standing waves appear on lower frequencies than in a dome?

Wish I could compare their not smoothed responses
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MarjanM View Drop Down
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Joined: 10 February 2005
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Points: 7816 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2017 at 2:56pm
Originally posted by Pasi Pasi wrote:

Care to elaborate?

http://www.lean-business.co.uk/eshop/index.php?main_page=popup_image&pID=2730


Whats to elaborate Pasi? Isnt it obviois? Cone goes both ways from the 1.75" point.
Marjan Milosevic
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Pasi View Drop Down
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Joined: 25 April 2010
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Points: 2732 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pasi Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2017 at 3:22pm
Originally posted by MarjanM MarjanM wrote:

Originally posted by Pasi Pasi wrote:

Care to elaborate?

http://www.lean-business.co.uk/eshop/index.php?main_page=popup_image&pID=2730


Whats to elaborate Pasi? Isnt it obviois? Cone goes both ways from the 1.75" point.


Well, yes. But for example in the inside the flat part is suspension, not diaphragm anymore. See the slits on phaseplug. Same on the outside, only until bottom of the V it is a diaphragm, rest is suspension. Hence the area is counted from both sides of the VC until the bottom of the groove. When you combine that into missing piece in the middle, then i think it's pushing it quite a lot to call it as equal to 2.9" dome.


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MarjanM View Drop Down
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Points: 7816 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2017 at 4:05pm
Jack Arnot in the USA is having the exact math at his PC. Ill ask him for it and share if you want. Its not BS info. I rechecked it years ago and it is correct.
Marjan Milosevic
MM-Acoustics
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Pasi View Drop Down
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Joined: 25 April 2010
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Points: 2732 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pasi Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2017 at 4:08pm
Originally posted by MarjanM MarjanM wrote:

Jack Arnot in the USA is having the exact math at his PC. Ill ask him for it and share if you want. Its not BS info. I rechecked it years ago and it is correct.


If you don't mind. Would be good to see it. Thanks.
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_djk_ View Drop Down
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Joined: 23 November 2004
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Points: 6002 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2017 at 9:47pm
"So take 10db off your figures."

Give me a break, I already took that into consideration.
djk
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