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Old 11th February 2007, 08:45 PM   #1
scottw is offline scottw  United States
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Join Date: Feb 2004
Location: Kalifornia
Default OB bass augmentation w/ PA drivers

There have been several examples of people using fairly inexpensive PA drivers to augment the lower frequencies in OB speakers. An example is Martin J. King's Project 7(with Alpha 15A):


Even these large PA drivers(15 inch) are designed to go up to a few kHz, although in this application they are only used up to a hundred or so Hz. These drivers also tend to have fairly stiff treated cloth surrounds.

What kind of changes would you expect if you replaced the stiff surround with a more complient foam surround? Increased VAS and Qms? Would the Fs change?

Is the low frequency roll off usually seen on SPL plots of PA drivers (on infinite baffles) related to the stiff surround?

I'm just wondering if a more complient surround could help a PA driver operate from Fs to around 150 Hz.

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Old 11th February 2007, 09:09 PM   #2
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Join Date: May 2002
Location: Switzerland
Is the low frequency roll off usually seen on SPL plots of PA drivers (on infinite baffles) related to the stiff surround?
I'd say it is a little bit because of the stiff surround which increases fs.
But to a larger part it is due to the low Qes which is good for efficiency but bad for LF reproduction in infinite baffles and OBs.


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