Dayton Audio H07E 6" x 6" Elliptical Waveguide 1-3/8"- 18 TPI Uncolored, natural sound Precision molded from high-performance plastic Standard 1-3/8" x 18 TPI mounting for screw-on drivers Nominal dispersion pattern: 80 H x 50 V Recommended minimum crossover frequency of 2,200 Hz