JBL 8124 / 8128 Ceiling mount Speaker Specifications (8124): Component: 100 mm (4 in) Full-Range Frequency Range (-10 dB): 60 Hz – 18 kHz Coverage: 130° conical Sensitivity (2.83V@ 1m): 93 dB (1 kHz - 8 kHz) Termination: Bare Wire Nominal Driver Impedance: 8 ohms Driver Power Capacity: 20 W 70V/100V Transformer Taps: 6 W, 3 W, 1.5 W, (0.75 W at 70 V only) Dimensions (Diameter x Depth): 206 mm (8.1 in) diameter round baffle x 89 mm (3.75 in) depth from back of baffle Cutout Dimension: 175 mm diameter (6.9 in) Net Weight: 1.2 kg (2.5 lb) Included Accessories: Sculpted Grille Optional Accessories: MTC-8124C C-ring MTC-RAIL tile rails Plenum Usage: Not intended for use in return air plenums