Many 1x12 cabinets use a thiele-small design or a bass-reflex system to produce more low-end punch than their small size suggests.
While smaller, a well-engineered 1x12 (like a FatCab ) can rival the "thump" of much larger enclosures due to specialized internal porting. Alternative Meanings Merlin_1x12
The Merlin engine family used by SpaceX (though they do not have a "1x12" designation, they use clusters like the Merlin 1D). Many 1x12 cabinets use a thiele-small design or