This is A Brand NEW Compatible Aftermarket. Replacement B52 18-220S / B52 18-220X Sub Woofer Speaker. Nominal diameter – 457mm / 18in. Nominal impedance – 8 Ohms. Frequency range – 30-2500Hz. Voice coil diameter – 100mm/4in. Chassis type – Cast aluminium. Magnet type – Ferrite. Coil material – Round copper. Former material – Glass fibre. […]... Read More