ResoNix CLD Rectangles are a constrained layer damper that is a combination of butyl rubber and aluminum that is adhered onto panels of the car to lower structure-borne vibration and resonance. Our CLD Rectangles are the exact same butyl formula and type of aluminum, just in larger sheets with a thinner overall thickness.
ResoNix CLD Rectangles are made with the same butyl formula and aluminum as our CLD Squares, but come in at 18” x 32” with a 50 mil butyl layer and 3 mil aluminum constraining layer to serve different purposes as well as providing a lower cost option. We do not suggest CLD Rectangles for areas of most importance like outer door skins, roofs, trunk lids, etc.. We suggest using our CLD Rectangles on panels where there is already some natural damping properties (panels that have strength from contours and supports) such as floors, some inner door skins, firewalls, etc. and to cover and seal large holes in the inner door skin to prevent front/rear wave cancellation for your door mounted speakers.
A CLD works by using a viscoelastic layer (the butyl) and a constraining layer (the aluminum) to convert mechanical energy (the vibration of a panel) into heat via the viscoelastic properties of butyl while the constraining layer helps the panel keep its shape and resist deformation. The primary way that CLD achieves this is through shear forces in the butyl layer caused by being constrained between the panel and the constraining layer while the panel is vibrating (bending). When the panel flexes and deforms, the viscoelastic layer naturally resists and wants to “snap” back into place. See Figure 1.
ResoNix CLD Squares should be used where you want to cut down on any structure-borne vibration and resonance. Long, flat, and thin panels, like outer door skins, door panels, quarter panels, and roof skins are the biggest offenders. Reducing structure-borne vibration helps lower the overall noise floor of the vehicle while also lowering the resonance caused by sound systems to an acceptable level. This can result in a faster decay of bass and midbass frequencies. Slow decay in these frequencies can cause “muddy” sounding bass response or can make it seem like repeated fast bass notes are blending together. See figure 2.
Our detailed how-to guide on how to get the most out of our products will be published shortly.