Check the listing for details. Rare Matched Pair Vintage 5-inch Alnico Full Range Drivers - Tested 7.9Ω. Condition: Used. Listed at 35.00 USD. These feature the highly desirable Alnico magnets with the classic adjustable center-pole screw, a feature found on high-end drivers of the 1950s/60s to allow for precise voice coil centering. • Impedance: Both drivers tested at a near-perfect 7.9 Ohms (DC resistance), making them a solid 8-ohm nominal match.