Two part related question
Part 1
At what point does an ever expanding 2nd order (sealed) enclosure
cross the line and become an infinite baffle? I always thought it would
be at the point where Vb=Vas. If the body of air behind the speaker
reaches the same compliance as the driver (Vas), wouldn't the driver
then behave as if it was, indeed, in an IB?
Part 2
At what point does an ever expanding 4th order (vented) enclosure
become, in effect, an infinite baffle? It is (less) my understanding that
port effectiveness, reflected in the porting parameters will eventually
reach zero. This is a far more complicated situation, especially, when
you consider (175% oversized) EBS tuning. Again, I'm weighting heavily
on Vas, as a starting point, but I'm really grasping at straws on
this one.
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