A multi-band spectral subtraction scheme is proposed, comprising a multi-band filter architecture, noise and signal power detection, and gain function for noise reduction. One or more parts of the hollow elastomeric body are translucent, and light from the light-emitting means is transmitted through the translucent parts of the body in use to produce an attractive diffuse lighting effect. The tool box holder includes security mechanism to keep the plural removable tool boxes safe from theft and prevent them from moving around the truck bed. A top spacer layer is positioned on the spring element sheet. xMs and SMs, or more generally yMs, fulfill the demands of stiffness and reduced variability, which have conventionally limited the commercial usefulness of a large scale use of renewables delivering power to a power grid. The data packets for each cell sector are then concurrently transmitted during the first subframe.