3-way speaker system, 6-1/2" Foamed-Mica Cellular Reinforced Woofers, 1-3/8" Polyester Main Tweeter, 3/4" Piezo Super Tweeter for extended high-frequency response Perfect compatibility with Sony MEX-N and CDG-G head units, Power Bass Response w/(50 -24,000 Hz) Effective Frequency Range 4 ohm Speaker Impedance, 270 W Max Power Handling, 40 W Rated Power Handling