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Old 2nd October 2015, 01:46 PM   #1
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Default Speaker factors affecting cabinet designs?

What factor determines the use of this or that particular type of speaker in various types of cabinets (like band pass,bass reflex,etc)?

Also,what is the effect of subwoofer speaker voice coil in various types of cabinets like bandpass,bass reflex,etc

Do the size of voice coil play an important role in the designing the cabinets?
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Old 2nd October 2015, 01:54 PM   #2
kaputt is offline kaputt  Germany
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The Thiele Small parameters.
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Old 2nd October 2015, 06:35 PM   #3
sreten is offline sreten  United Kingdom
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Voice coil size has pretty much no design consequences.
(Apart from the obvious consequences of voice coil size.)

rgds, sreten.
There is nothing more practical than a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
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Old 3rd October 2015, 07:15 AM   #4
AllenB is offline AllenB  Australia
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What about thermal modulation?
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Old 4th October 2015, 06:17 AM   #5
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With the Thiele small parameters,how do i decide which cabinet to design for that speaker?
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Old 4th October 2015, 06:31 AM   #6
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just hit the "I'm lucky" button
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Old 4th October 2015, 10:01 AM   #7
sangram is offline sangram  India
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The T/S parameters are an approximation of the behaviour of the motor and diaphragm when in an enclosure (actually it is about more than that, but for now the short explanation will do).

You need a speaker simulator like WinISD or BassBox, which will model the most appropriate enclosure size for a given woofer and alignment. Alignment is the nature of the bass rolloff below resonance.

Here is a nice article to get you started: Understanding Loudspeaker Data | Eminence Speaker

You can download WinISD for free, it comes with a bunch of loudspeaker models which can get you started on the basics before you find the data for your given driver, create a new model for it and then give it to the simulator for a computation of the box.

Voice coil heating has a small effect on the low end response, and the program will allow you to model it for various VC temperature rise.

In general by looking at a few parameters of the driver you can tell what kind of a box might suit it, but the computation is essential to get the result working somewhat well. Since the T/S are only an approximation, the results are slightly inexact (also drivers have quite a wide variation form the average spec) but in general at the very low end the room and placement typically have a far more profound effect on bass response than the box itself.
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