Pyle PDB252 Aluminum Compression Horn Driver, Midrange/Tweeter, 500 Watt, 1.4'' (35mm), Bolt-on Type, 8 Ohm Midrange/Tweeter Compression Horn Driver 1.4"' (35mm) Flat Aluminum Voice Coil - 250 Watt RMS/500 Watt Peak Frequency Response: 1.5K-20kHz - 8 Ohm Impedance Sensitivity: 95dB SPL 1W/1M - 30 Oz. Magnet Structure Fits Horns with Four M6 Threaded Holes 90" Apart on 3"' (76mm) Diameter Circle