Deep Bass without giving up Space. Each part used is heat resistant to realize high durability. The new Graduated Pleat Damper helps prevent stress from affecting specific parts of the damper. This minimizes mechanical damage and dramatically improves the damper's durability. Compact Size for Installation in Various Places. Frequency Response 35 - 150Hz. Dimensions (W x H x D) 350mm (13-3/4") x 75mm (2-15/16") x 240mm (9-7/16). 1 Car Audio Security Ltd is a UK based company. RIO, IOM, IOW, JERSEY, GUERNSEY, SHETLANDS, N.