posted
I was wondering if anyone had any idea of what factors determin the cone rise on a sealed enclosure? from what I understan smaller boxes have less cone rise but is there a ration that explains the realtionship between the two?
example: one 12 inch sub in one cube has a rise of 2.5X
one 12 inch sub in two cubes has a rise of 4X
I am sure this will vary under form differant factors but some good base line info from test results would be helpful this is for SPL setups only! so if anyone could share there results it would be helpful. Thank you for your help.
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posted
in the larger box, the cone will travel further from center for a given power. as it reaches excursion, the inductance rises, causing impedance to rise as well. most subs will have different inductance changes on the positive and negative strokes. shorting ring can help to keep this more balanced. also, the smaller box has more "air spring", helping to add extra control over the sub, especially at lower freq, which will keep the impedance curve less dynamic than with a ported box
Posts: 5516 | From: Columbus, OH - formerly FL | Registered: Oct 2003
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posted
I am sorry I am not sure what a shorting ring is where can I get one?
this will be at a high Hz some where around 68-73Hz?
I was looking at about 4cubes after displacment for two 15's?
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posted
if a sub has a shorting ring, it's designed and put in during the build. can't really add one after the fact. It's just a ring, often made of copper. Basically, when the sub is at negative stroke, there is more polepiece and motor affecting the coils reaction than there is at positive stroke. this creates a lopsided inductance curve. a shorting ring is put in place to attempt to balance this for a well rounded subwoofer. sometimes more than one ring at different locations can be used.
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posted
LOTS of speakers have shorting rings built in. from Dayton Audio, to JL Audio
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