Hi-end speaker, suitable for school auditorium, outdoor play ground, multi-function room, meeting room, music performance Nominal Impedance]: 8 [Rated Power]: 400 [Recommended Amp.]: 400-800 [Frequency Response]: 55-18k [Sensitivity]: 98 [Maximum SPL]: 130 Dispersion]: H90xV40 (WHD)[Dimension]: 373*603*385 (kg)[Weight]: 12"full frequency speaker