The SB Acoustics SB15SFCR39-4 is a unique 5x8 inch 'racetrack' style midwoofer featuring a robust vented steel chassis and a hard paper cone. This 4 ohm drive unit has that lovely warm, fast paper cone sound with good bass weight. Ideal for tall slim cabinets. Fantastic value.
Also available in 8 ohms: SB15SFCR39-8.
A matching passive radiator is available: SB15SFCR39-0