Shallow-mount, true high-performance woofer, Delivers extreme bass with minimum depth, 4 Ohm four-layer voice coil for max power handling, Dark gray modified-spoke cone with bracing for clear bass response, Ventless solid-pole design for direct mount to enclosure rear wall, Steel ""clearance"" adapter plate replaces part of enclosure wall depth to further lessen depth, High-temp coil wire, Slender, strong steel basket with coil-cooling perimeter venting, Durable Spiralead tinsel leads, Tough double-stitched surround, Special spring-loaded binding posts for minimizing depth, Size (in, ,cm): 12, 30, Impedance (OHMS): 4, Max Rec Amplifier Power (Watts Peak/RMS): 800/400, Frequency Response (Hz): 25-350, Mounting Depth (in, ,cm): 4-3/8, 11, 1, Mounting Cutout (in, ,cm): 11, 28, 1, Min Rec Sealed Box Volume (CU, FT, , Liters): 1, 0, 28, 3, Max Rec Sealed Box Volume (CU, FT, , Liters): 4, 6, 130, Min Rec Vented Box Volume (CU, Ft, , Liters): 1, 75, 49, 6, Max Rec Vented Box Volume (CU, Ft, , Liters): 2, 25, 63, 7, SKU: TBALL9484