... x30 ° level constant poit horn loaded four high-performance 8" MF units and two 3"high compression drive units3., ... loudspeakers to minimal, with long-range, high sensitivity, penetration power, regional voice covered evenly, such as features.4. ... ±3dB40Hz~17KHzAxial sensitivityLF99 dBMF102 dBHF113 dBImpedanceLF4 ΩMF8 ΩHF4 ΩPower handling, AES standardLF1000 WMF800 WHF300 WNominal Coverage Angle/-6dB ...