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Steve Williamson said:
I thought that the reason you used multiple subs in an IB was because of the non damping issue and heat, also, don't most newer boxed subs have some form of mechnical damping system as well to produce a tighter cleaner bass sound?
Nope, the reason is not that they're less efficient- they're more efficient mechanically. It's that we're ignoring half the energy of the speaker- we 'throw away' the derived sound wave.

So, to make up for it, we add in more subs to get our SPL to where we want (I'm still searching for a definitive guide to how much this is).

As far as new box designs, yes, they're using passive radiators to trade off airflow for more sound. Read up on it here: http://electronics.howstuffworks.com/speaker10.htm

But any of those are just tradeoffs- even though passive radiators put out more sound- that sound is ~180 out of phase and doesn't help clarity.
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