"I understand the basics of dipole bass reproduction, but I don't know what to compare them to. all else being equal, is a 15" dipole the same as your average 8" in a sealed box? "
SPL/W acoustic efficiency at say 1m distance is not everything. It is mostly about how they move air - dipole radiation pattern and it's operation in a small room.
More here Prototyping a Dipole Bass System
The lower we go the more difficult it gets http://www.musicanddesign.com/Boundary_reflections.html
then cardioid pattern could help? DIY Loudspeakers Kimmo Saunisto
SPL/W acoustic efficiency at say 1m distance is not everything. It is mostly about how they move air - dipole radiation pattern and it's operation in a small room.
More here Prototyping a Dipole Bass System
The lower we go the more difficult it gets http://www.musicanddesign.com/Boundary_reflections.html
then cardioid pattern could help? DIY Loudspeakers Kimmo Saunisto
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