Rockford Fosgate P3D4-12 12" Dual 4-Ohm Subwoofer 3.5 Inch Speakers 5-inch copper voice coil and

5-inch copper voice coil and a 27-ounce magnet

also identified by Hertz as the MP 25

This material combination is paired with a strontium ferrite woofer magnet

75-inch silk dome tweeter handles high-frequency detail

Rockford Fosgate P3D4-12 12" Dual 4-Ohm Subwoofer 3.5 Inch Speakers 5-inch copper voice coil andThe Rockford Fosgate P3D4 12 is a 12 inch dual 4 ohm voice coil subwoofer designed to add controlled low frequency output to a car audio system. Its dual coil configuration provides wiring flexibility for matching a compatible mono or multi channel amplifier. It is suited to listeners building a dedicated bass system or upgrading an existing subwoofer enclosure. With a 600 watt RMS power rating and 1,200 watt maximum rating, this subwoofer is intended