musgofasa
Seasoned Member
  

Where is that monkey? I want to shoot something!
Posts: 556
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WO is a sealed Band Pass configuration. The horn (or expanding port) helps make it more efficient, but does not help control driver excursion at any particular freuquency.
A ported box will have a lot higher efficiency at the tuning frequency which makes it louder.
The bottom line for SPL is the amount of power and the amount of efficiency. If a system is 100db efficient (as example) and you put 200 watts on it, it will be louder than the same 200 watts on a 90db efficient system. Of course, if the more efficient system will handle 2000 watts and you have 2000 watts to put on it, it will be louder.
The issue becomes the environment the cabinet is in. It can also be the equipment in question. With high powered subs, you typically can't get too much power so making the enclosure/ environment combo more efficient is the main goal to take advantage of the power at hand.
Hope that was what you were looking for.
Take care, Robert
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