All Eminence horns are constructed of a high-density, heavy-duty, injection molded ABS. Horn type: Constant Directivity. Minimum frequency: 1 kHz. Nominal dispersion: 80° H x 60° V. Throat diameter: 1". Mounting type: 2-bolt/3-bolt. Dimensions: 6.7" W x 6.4" H x 3.8" D. Mounting type notes: 2-bolt: For 2 x 1/4"-20, 3" o.c. mount drivers; 3-bolt: For 3 x M6, 2.25" o.c. mount drivers. Eminence model LT250.