Passive radiator?? |
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Shortrope
Young Croc Joined: 08 July 2013 Location: Ireland Status: Offline Points: 1232 |
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Posted: 16 February 2015 at 10:39am |
I'm in the process of making a Boomcase from an Old pair of Tannoy speakers.
One of the Bass driver has a bust coil but is otherwise good. Could this be used as a Passive radiator in conjunction with the working Bass driver, what are the considerations?? |
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My Tinnitus is coming along nicely!!
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davey t
Young Croc Joined: 11 March 2004 Location: Bristol UK Status: Offline Points: 1428 |
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You can use any old driver as a passive radiator with a few considerations:
It needs to have a larger surface area than the active driver. about 1.5X bigger It needs to have a large mechanical xmax as PRs move a lot. You will probably need to add mass to the cone to tune it low enough. Generally speaking you want to tune the PR to half the lowest frequency of your box. So if you would normally use a port tuned to 60Hz, use a PR tuned to 30Hz. You'll want to try to remove the magnet to save weight. You need to consider the VAS of the PR.... use a sim program to test it all
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Minirig portable soundsystem movement
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Shortrope
Young Croc Joined: 08 July 2013 Location: Ireland Status: Offline Points: 1232 |
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Thanks Davey, interesting stuff.
Not surprisingly it's not as simple as I thought. I don't think it's a goer for this project then. |
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My Tinnitus is coming along nicely!!
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Hemisphere
Old Croc Joined: 21 April 2008 Status: Offline Points: 2272 |
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Just picked up an ADX Fusion from Amazon with dual radiators for £30 - Poor man's Soundlink Mini basically, very impressive for the price, not the loudest and some tracks do distort but the radiators give implausibly powerful bass and build quality is like twice the price.
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