Planet Audio BB460 4-Inch x 6-Inch 2-Way Silver Glass-Fiber Woofer Cone Speaker System Power Handling (Peak) 120W , Power Handling (Continuous) 60W , Frequency Response 80 Hz-20Khz , Efficiency (1 Watt/1 Meter) 90 Db , Impedance 4 Ohm Mid Bass Woofer: 3-Inch , Soft Dome Tweeter: 1-Inch, Soft Dome Micro Tweeter  , Woofer Magnet Structure 15 Oz , Mounting Depth 1-13/16-Inch 4-Inch X 6-Inch 2-Way Plate Speaker Systemsilver Glass-Fiber Woofer Cone Patented Crs (Cloth Reinforced Santoprene) Surround Open Design-Inch Stamped Basket Black Anodized Aluminum Voice Coil Former  Silk Soft Dome Tweeters With Neodymium Magnets Bi-Amp Capability  Custom Tooled Grilles Each Pair Of Big Bang Speaker Systems Includes A Pair Of Custom Designed Outboard Crossovers