Merlin_1x12 -

A 1x12 cabinet is favored for its focused, directional sound. It provides clear mids and highs, making it ideal for recording and smaller club stages.

The Merlin engine family used by SpaceX (though they do not have a "1x12" designation, they use clusters like the Merlin 1D). Merlin_1x12

Many 1x12 cabinets use a thiele-small design or a bass-reflex system to produce more low-end punch than their small size suggests. A 1x12 cabinet is favored for its focused, directional sound