Another factor people often overlook with large bass horns and speakers in general are where the dimensions place the source relative to boundaries. Many times someone will have a very deep box which places the mouth as much as 4' from the front wall. Well friends, the reflection from that boundary places a big null at 70Hz. Curious how so many say that they can't get that "punch" from big bass horns up close... Take that box and turn it 90 degrees and fire it along the wall or into the corner and most will change their tune.

Just something else to consider.

-Mark Seaton