These products were designed to be used for sound reinforcement systems at medium frequencies.Recommended for pagers, soccer/football stadiums, auditoriums, churches and any other environment requiring efficiency at medium frequencies.These drivers are produced with phenolic diaphragms and can be coupled to 1'' and 2'' horns.Throat diameter: 25 mm.RMS: 100W.Musical program power (W): 200.Impedance in ohms: 8.SPL 1 W 1m (dB): 107.Frequency Resp -10 dB (Hz): 400 to 9,000.Magnet weight: 332 g.Voice coil diameter: 51 mm.Cut freq at 12 dB/Oct (Hz): 1,000.Testing Horn: HL14-25.Diaphragm material: Phenolic.Horn connection: Thread.Cover/base material: Aluminum.