Feature●High sensitivity output designed for pro audio duty●1" PEI diaphragm for a smooth response●Compact Size to fit in the tightest spaces for smaller boxes●Standard 1-3/8 18TPI throat is compatible with many screw on horns●2,500Hz crossover point is perfect for 2-way and 3-way designsDescription The PRO-8 from Dayton Audio was designed to meet the demands of the market for replacement horn drivers. With a great price-to-performance ratio, you would be hard-pressed to find a better backup to keep on hand!